air-cooled global chiller - daikin appliedalarms are self clearing when the fault condition is...

Product Manual PM AGZ1

Group: Chiller

Effective: August 1997

Supersedes: None

© 1997 McQuay International

Air-Cooled Global Chiller

AGZ 029A through 054A50 Hertz MetricScroll Compressors using Refrigerant R-22

2 AGZ 029A through 054A Product Manual AGZ1

Table of Contents

Introduction ............................................................................................. 3

Features and Benefits .............................................................................. 3

Design Advantages.................................................................................. 4

Selection Procedure................................................................................. 6

Application Adjustment Factors.............................................................. 7

Performance Data, R-22.......................................................................... 9

Part Load Data......................................................................................... 9

Pressure Drop Curves............................................................................ 11

Electrical Data ....................................................................................... 12

Physical Data......................................................................................... 16

Dimensional Data.................................................................................. 18

Application Data ................................................................................... 19

Optional Features .................................................................................. 22

Product Specification ............................................................................ 25

"McQuay" is a registered trademark of McQuay International1997 McQuay International

"Illustrations cover the general appearance of McQuay International products at the time of publication and we reservethe right to make changes in design and construction at anytime without notice"

Product Manual AGZ1 AGZ 029A through 054A 3

Introduction

The McQuay AGZ air-cooled chiller is a product of the McQuay commitment tooffer reliable energy efficient equipment design. A design approach incorporatinghigh quality compressors and uncompromised operating efficiency.

Nomenclature

A G Z - XXX A S

Features and Benefits

Efficiency• Cross-circuit compressor staging

• Copeland tandem scroll compressors

• Full load efficiencies from 3.0 to 3.1 COP

• Oversized condenser coils

Reliability• Rugged compressor design

• Factory installed operating and safetycontrols

Flexibility• Complete factory assembly

• Small footprint

• SpeedTrol (optional)

• Many options to meet job requirements

• Two control options

Serviceability• Dual refrigerant circuits

• Easy servicing -- Electrical and refrigerantcomponents are readily accessible

• Control box with full access hinged doors

• Components accessible from outside of unit

Air-Cooled

Global

Scroll Compressor

Design Vintage

Model Size029 through 054

ApplicationS= Standard Cooling


Design Advantages

ConstructionFactory assembled and mounted on heavy-gauge painted phosphatized galvanized steel channel base.This base distributes the unit weight for uniform roof loading. Varied and convenient installation ispossible by virtue of the units small footprint.

CompressorsCopeland’s Compliant Scroll tandem compressors are used. These rugged hermetic compressorsare constructed with an integral cast iron frame, cast iron scrolls, three Teflon impregnated bearings,and three oil filtration devices for each compressor.

Using Copeland's Compliant Scroll tandems provides four steps of modulation. One throughfour compressors can run, depending on the load of the system, resulting in excellent part-loadefficiency. Each refrigerant circuit has two specially designed oil and gas equalization lines betweenscroll compressors. This provides oil level equalization between compressors.

The design also offers radial and axial compliance of the scroll sets in operation (no tip seals), alarge internal volume for liquid handling, a removable suction screen, and a rotary dirt trap and oilscreen. In addition, the compressor is self-compensating for wear, handles liquid and debris, andinherently yields the highest efficiency for its class.

A fail-safe compressor by design includes a solid state motor protection module, 4 individualmotor-winding sensors, a patented internal discharge temperature probe, and a patented shutdownfeature that prevents reverse rotation. An internal discharge check valve helps prevent shutdownnoise. The compressor comes standard with high and low pressure taps with Shrader valves, an oillevel sight glass, an oil level adjustment valve, and an off cycle crankcase heater.

Units are available in 50 Hertz electrical voltage configurations operating at 2950 RPM.

Condenser CoilsCondenser coils have internally enhanced seamless copper tubes arranged in a staggered row pattern.The coils are mechanically expanded into McQuay lanced and rippled aluminum fins with full fincollars. An integral subcooler circuit provides subcooling to effectively eliminate the possibility ofliquid flashing and maximizes efficiency. The coils have plenty of internal volume to allow fullpumpdown during off cycles and for service pumpdown.

Electrical Control CenterOperating and safety controls and motor starting components are housed in a centrally located,weatherproof control panel with hinged and keylocked doors. Three levels of control are available:

Global UNTMicroprocessor based control that accomplishes unit capacity control by 4-stage cross-circuitcompressor cycling based on leaving chilled water temperature. Set point and control band are easilyfield adjusted. Anti-cycling and stage delay relays are included. Safety controls include low and highrefrigerant pressure, low evaporator flow, sensor failures, and evaporator freeze protection. Motorprotection includes phase voltage, volts ratio, and solid state compressor motor protection. Outsideair reset using a 4-20ma signal is standard. Return water reset, demand limit reset and remote resetusing a 4 to 20 ma signal are available options.


Global UNT with Zone Terminal (optional)Provides an onboard (or remotely wired) display of unit operating parameters and adjustment ofcertain optional control options.

MicroTech (optional)Exclusive microprocessor control found throughout McQuay chiller equipment. The interface is a 12key keypad and 4-line, 40 character backlit liquid crystal display. The MicroTech continuouslyperforms self diagnostic checks on all system temperatures, pressures, and safeties, and willautomatically shut down a circuit or the entire unit at fault conditions. The cause, time, and date ofthe occurrence is recorded and can be displayed along with the seven previous incidents.

If a fault occurs, the controller takes proactive measures to stay on-line; staging down capacity,activating a pre-alarm signal and automatically switching to the alarm menu on the display. Pre-alarms are self clearing when the fault condition is corrected, allowing the unit to resume normaloperation.

Critical shutdown alarms such as high condenser pressure, freeze protection, and low evaporatorpressure are manual reset and must be cleared at the keypad to resume operation.

Choose the MicroTech control and Open Protocol options to interface with virtually any buildingmanagement system and perform remote monitoring and control by hard wiring or modem .

The standard FanTrol system controls refrigerant discharge pressure. The FanTrol system cyclescondenser fans based on discharge pressure and is suited for operation to 4.4°C (40°F). The optionalSpeedTrol control uses both fan cycling and fan speed control and allows operation to -18°C (0°F).

Condenser Fans and MotorsMultiple direct drive propeller fans operate in formed venturi opening at low tip speeds for maximumefficiency and minimum noise and vibration. A heavy-gauge vinyl-coated mesh fan guard protectseach fan.

Each condenser fan motor is heavy-duty, 3-phase with permanently lubricated ball bearings andinherent overload protection. Totally enclosed fan motors are available as an option.

EvaporatorThe evaporator is direct expansion, shell-and-tube type with water flowing in the baffled shell sideand refrigerant flowing through the tubes. Two independent refrigerant circuits within the evaporatorserve the units dual refrigerant circuits.

The evaporator has a carbon steel shell and seamless high efficiency copper tubes rollerexpanded into a carbon steel tube sheet. Water baffles are polypropylene to resist corrosion.

Refrigerant heads are carbon steel with multi-pass baffles to ensure oil return and are removableto permit access to the tubes from either end. For water removal, 10mm (3/8") vent and drain plugsare provided on the top and bottom of the shell.

The evaporator is wrapped with an electric resistance heater cable and insulated with 19mm(3/4") thick vinyl nitrate polymer sheet insulation, protecting against water freeze-up at ambient airtemperatures to -29°C (-20°F). An ambient thermostat controls the heater cable.

The fitted and glued in place insulation has a K factor of 0.28 at 23°C (75°F).

The refrigerant (tube) side maximum working pressure is 1552 kPa (225 psig). The water sideworking pressure is 1207 kPa (175 psig). Each evaporator is designed, constructed, inspected, andstamped according to the requirements of the ASME Boiler and Pressure Vessel Code.

NOTE: A water flow switch or both water flow switch and water pump starter interlock, must befield installed to protect against evaporator freeze-up under low water flow conditions.


Selection Procedure

Selection Procedure 50 Hertz Metric UnitsTable 4 covers a range of leaving evaporator water temperatures and outside ambient temperatures.The tables are based on a 5.6°C temperature drop through the evaporator. The minimum leavingchilled water temperature setpoint without glycol is 4.5°C. For brine selections, see Table 1 forethylene or Table 2 for propylene glycol adjustment factors. Ratings are based on a 0.044 foulingfactor in the evaporator at sea level operation. For other fouling factors, derates (for differenttemperature differences), or altitude correction factors see Table 3. For applications outside thecatalog ratings contact your local McQuay sales representative

Selection exampleGiven:

186 kW minimum35°C ambient air temperature12°C - 7°C chilled water temperature0.044 evaporator fouling factor

1. From Table 6, an AGZ 054AS at the given conditions will produce186.9 kW with a compressorkW input of 56.3 and a COP of 3.0.

2. Calculate the evaporator L/s:

186 9

4 18 58 9

.

..

kW

C× °= L / s

3. Determine the evaporator pressure drop. Using Figure 1, enter at 8.9 L/s and follow up to theAGZ 054AS line. Read horizontally to obtain an evaporator pressure drop of 39kPa of water.

Selection example using ethylene glycolGiven:

179 kW minimum35°C ambient air temperature12°C - 7°C chilled water temperature0.044 evaporator fouling factorProtect against freezing down to -18°C1. From Table 1, select an ethylene glycol concentration of 40% to protect against freezing

at -18°C

2. At 40% ethylene glycol, the adjustment factors are: Capacity = 0.961, kW = 0.976,GPM = 1.121, pressure drop = 1.263

3. Consider the AGZ 054AS and correct with 40% ethylene glycol factors.

4. Correct capacity = 0.961 X 186.9 kW =179.6 kW

5. Correct compressor kW = 0.976 X 56.3 kW = 54.9 kW

6. Correct chilled water flow:

Water flow (at corrected capacity) = 179 6

4 18 58 6

.

..

kW

C× °= L / s

Water flow (at 40% solution) = 1.121 X 8.6 L/s = 9.6 L/s

7. Determine the evaporator pressure drop. Using Figure 1, enter at 9 L/s and follow up to theAGZ 050As line intersect. Read horizontally to obtain an evaporator pressure drop of 6 kPa ofwater. The pressure drop for 40% solution = 1.263 X 6 kPa = 7.6 kPa


Application Adjustment Factors

Ethylene And Propylene Glycol FactorsAGZ units can operate with a leaving chilled fluid temperature range of -6°C (20°F) to 10°C (50°F) .A glycol solution is required when leaving chilled fluid temperature is below 4.6°C (40°F). The useof glycol will reduce the performance of the unit depending on concentration.

Altitude Correction FactorsPerformance tables are based at sea level. Elevations other than sea level affect the performance of theunit. The decreased air density will reduce condenser capacity consequently reducing the unit'sperformance. For performance at elevations other than sea level refer to Table 3

Evaporator Temperature Drop FactorsPerformance tables are based on a 5°C (10°F) temperature drop through the evaporator. Adjustmentfactors for applications having temperature drops from 3.3°C to 8.9°C (6°F to 16°F) are in Table 3.Temperature drops outside this 3.3°C to 8.9°C (6°F to 16°F) range may affect the control system'scapability to maintain acceptable control and are not recommended.

The maximum water temperature that can be circulated through the evaporator in a non-operatingmode is 37.8°C (100°F).

Table 1, Ethylene Glycol Factors% Freeze Point

E.G. °F °C Capacity Power GPM PD10 26 -3 0.991 0.996 1.013 1.07020 18 -8 0.982 0.992 1.040 1.12930 7 -14 0.972 0.986 1.074 1.18140 -7 -22 0.961 0.976 1.121 1.26350 -28 -33 0.946 0.966 1.178 1.308

Table 2, Propylene Glycol Factors% Freeze Point

P.G. °F °C Capacity Power GPM PD10 26 -3 0.987 0.992 1.010 1.06820 19 -7 0.975 0.985 1.028 1.14730 9 -13 0.962 0.978 1.050 1.24840 -5 -21 0.946 0.971 1.078 1.36650 -27 -33 0.929 0.965 1.116 1.481


Fouling FactorPerformance tables are based on water with a fouling factor of 0 0442. m C kW×° / per ARI 590. Asfouling is increased, performance decreases. For performance at other than 0.00025 (0.044)foulingfactor refer to Table 3.

Foreign matter in the chilled water system will adversely affect the heat transfer capability of theevaporator, and could increase the pressure drop and reduce the water flow. To ensure optimum unitoperation, maintain proper water treatment.

Table 3, Capacity and Power DeratesChilled Water Fouling Factor

Delta-T 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)ALTITUDE °F °C Capacity Power Capacity Power Capacity Power

6 3.3 0.992 0.995 0.996 0.982 0.911 0.9358 4.4 0.995 0.997 0.969 0.984 0.914 0.937

SEA 10 5.6 1.000 1.000 0.975 0.986 0.919 0.939LEVEL 12 6.7 1.005 1.002 0.980 0.989 0.923 0.941

14 6.8 1.010 1.005 0.985 0.991 0.928 0.94316 8.9 1.014 1.007 0.989 0.993 0.930 0.9446 3.3 0.978 1.005 0.957 0.990 0.903 0.9438 4.4 0.982 1.007 0.961 0.993 0.905 0.94510 5.6 0.986 1.009 0.965 0.995 0.909 0.947

2000 feet 12 6.7 0.992 1.011 0.970 0.998 0.914 0.94914 6.8 0.997 1.014 0.973 1.001 0.919 0.95216 8.9 1.000 1.016 0.975 1.002 0.921 0.9536 3.3 0.966 1.016 0.944 0.999 0.894 0.9518 4.4 0.969 1.018 0.947 1.001 0.896 0.95310 5.6 0.973 1.021 0.952 1.005 0.900 0.956

4000 feet 12 6.7 0.978 1.025 0.956 1.008 0.904 0.95814 6.8 0.982 1.027 0.959 1.011 0.909 0.96016 8.9 0.986 1.028 0.961 1.015 0.911 0.9616 3.3 0.953 1.025 0.930 1.009 0.884 0.9618 4.4 0.955 1.028 0.934 1.011 0.887 0.96210 5.6 0.959 1.031 0.939 1.013 0.890 0.964

6000 feet 12 6.7 0.963 1.034 0.942 1.017 0.895 0.96614 6.8 0.968 1.036 0.946 1.020 0.899 0.96816 8.9 0.972 1.037 0.949 1.024 0.902 0.969


Performance Data, R-22Table 4 , AGZ 029AS through AGZ 054AS

AMBIENT AIR TEMPERATUREAGZ LWT 25°C 30°C 35°C 40°C 45°C 46°C

Model (°C) CAP.. PWR CAP. PWR CAP. PWR CAP. PWR CAP. PWR CAP. PWRkW kWi COP kW kWi COP kW kWi COP kW kWi COP kW kWi COP kW kWi COP

5 112.5 23.9 3.9 107.2 27.0 3.3 101.9 31.4 2.8 97.1 34.3 2.5 91.8 38.7 2.1 90.8 39.6 2.06 115.7 24.0 4.0 110.4 27.3 3.4 105.1 30.3 3.0 100.3 34.4 2.5 95.0 39.1 2.2 93.9 40.0 2.17 119.1 24.2 4.1 113.7 27.5 3.5 108.4 29.5 3.1 103.5 34.6 2.6 98.1 39.4 2.2 97.0 40.3 2.1

029AS 8 122.9 24.3 4.2 117.3 27.5 3.6 111.7 31.8 3.0 106.7 34.9 2.7 101.1 39.5 2.3 99.9 40.4 2.29 126.7 24.5 4.3 120.9 27.6 3.7 115.0 32.0 3.1 109.9 35.1 2.7 104.1 39.6 2.3 102.9 40.5 2.310 130.4 24.6 4.4 124.5 27.8 3.8 118.5 32.2 3.2 113.1 35.2 2.8 107.0 39.7 2.4 105.8 40.6 2.35 129.5 28.2 3.9 123.3 31.8 3.3 117.2 36.9 2.8 111.8 40.3 2.5 105.7 45.3 2.1 104.5 46.3 2.06 133.2 28.4 4.0 127.1 32.1 3.4 121.0 35.6 3.0 115.5 40.4 2.5 109.3 45.7 2.2 108.1 46.8 2.17 137.1 28.6 4.1 130.9 32.4 3.5 124.7 34.6 3.1 119.1 40.5 2.6 112.8 46.1 2.2 111.6 47.2 2.1

034AS 8 141.5 28.8 4.2 135.0 32.4 3.6 128.6 37.4 3.0 122.8 41.0 2.7 116.3 46.2 2.3 115.0 47.3 2.29 145.8 28.9 4.3 139.2 32.5 3.7 132.4 37.5 3.1 126.5 41.1 2.7 119.8 46.4 2.3 118.4 47.4 2.310 150.1 29.1 4.4 143.3 32.7 3.8 136.4 37.8 3.2 130.1 41.3 2.8 123.1 46.4 2.4 121.7 47.5 2.35 141.6 31.4 3.9 134.9 35.3 3.3 128.3 40.8 2.8 122.3 44.5 2.5 115.6 50.0 2.1 114.3 51.1 2.06 145.7 31.5 4.0 139.0 35.6 3.4 132.3 39.9 3.0 126.3 44.7 2.5 119.6 50.5 2.2 118.2 51.7 2.17 150.0 31.7 4.1 143.2 35.9 3.5 136.4 39.2 3.1 130.3 44.9 2.6 123.5 50.9 2.2 122.1 52.1 2.1

039AS 8 154.8 31.9 4.2 147.7 35.9 3.6 140.7 41.3 3.0 134.3 45.3 2.7 127.2 51.0 2.3 125.8 52.2 2.29 159.5 32.1 4.3 152.3 36.1 3.7 144.8 41.5 3.1 138.3 45.5 2.7 131.0 51.2 2.3 129.6 52.3 2.310 164.2 32.3 4.4 156.8 36.3 3.8 149.2 41.8 3.2 142.4 45.7 2.8 134.7 51.3 2.4 133.2 52.4 2.35 160.8 36.3 3.9 153.2 40.7 3.3 145.6 47.0 2.8 138.9 51.2 2.5 131.3 57.5 2.1 129.8 58.7 2.06 165.4 36.5 4.0 157.9 41.1 3.4 150.3 46.0 2.9 143.4 51.4 2.5 135.8 58.0 2.2 134.3 59.3 2.17 170.3 36.7 4.1 162.6 41.4 3.5 154.9 45.4 3.1 147.9 51.6 2.6 140.2 58.4 2.2 138.6 59.8 2.1

044AS 8 175.7 36.9 4.2 167.7 41.4 3.6 159.7 47.6 3.0 152.5 52.1 2.7 144.5 58.6 2.3 142.9 59.9 2.29 181.1 37.2 4.3 172.9 41.6 3.7 164.4 47.8 3.1 157.1 52.3 2.7 148.8 58.8 2.3 147.1 60.1 2.310 186.4 37.3 4.4 178.0 41.9 3.8 169.4 48.1 3.2 161.7 52.5 2.8 152.9 58.9 2.4 151.2 60.2 2.35 177.0 40.4 3.9 168.7 45.4 3.3 160.3 52.2 2.8 152.9 56.9 2.5 144.5 63.8 2.1 142.9 65.1 2.06 182.1 40.7 4.0 173.8 45.7 3.4 165.4 51.1 2.9 157.9 57.1 2.5 149.5 64.4 2.2 147.8 65.8 2.17 187.5 40.9 4.1 179.0 46.1 3.5 170.5 50.3 3.0 162.9 57.3 2.6 154.3 64.8 2.2 152.6 66.3 2.1

049AS 8 193.5 41.2 4.2 184.7 46.1 3.6 175.8 52.9 3.0 167.9 57.8 2.7 159.1 65.0 2.3 157.3 66.5 2.29 199.4 41.4 4.3 190.3 46.3 3.7 181.0 53.2 3.1 172.9 58.1 2.7 163.8 65.2 2.3 161.9 66.7 2.310 205.2 41.6 4.4 196.0 46.6 3.8 186.5 53.5 3.2 178.0 58.3 2.8 168.4 65.3 2.4 166.5 66.8 2.35 194.0 44.8 3.9 184.8 50.2 3.3 175.7 57.7 2.8 167.5 62.8 2.5 158.4 70.3 2.1 156.6 71.9 2.06 199.6 45.1 4.0 190.4 50.6 3.4 181.3 56.9 2.9 173.1 63.1 2.5 163.8 71.0 2.2 162.0 72.6 2.17 205.4 45.3 4.1 196.2 50.9 3.5 186.9 56.3 3.0 178.5 63.4 2.6 169.1 71.5 2.2 167.2 73.2 2.1

054AS 8 212.0 45.6 4.2 202.4 51.0 3.6 192.7 58.5 3.0 184.0 63.9 2.7 174.3 71.8 2.3 172.4 73.3 2.29 218.5 45.9 4.3 208.6 51.3 3.7 198.4 58.8 3.1 189.5 64.1 2.7 179.5 72.0 2.3 177.5 73.5 2.310 224.9 46.1 4.4 214.7 51.5 3.8 204.4 59.1 3.2 195.0 64.4 2.8 184.5 72.1 2.4 182.4 73.6 2.3

Notes:1. Ratings based on evaporator fouling of 0.00025, evaporator temperature drop of 5.6°C and sea level altitude.2. Interpolation is allowed; extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.3. KWi input is for compressors only. COP is for the entire unit, including compressors, fan motors and control power.4. For LWT below 4.5°C please refer to Application Data.


Part Load DataTable 5, R-22, AGZ 029AS through AGZ 054AS

50 HzAGR % Load Capacity Power

kW Unit kW COP IPLV100.00 108.4 34.5 3.1

029AS 75.00 81.3 22.7 3.6 3.750.00 54.2 14.1 3.825.00 27.1 6.4 4.3100.00 124.7 39.6 3.1

034AS 75.00 93.5 25.8 3.6 3.850.00 62.4 15.6 4.025.00 31.2 7.0 4.4100.00 136.4 44.2 3.1

039AS 75.00 102.3 27.9 3.7 3.850.00 68.2 17.0 4.025.00 34.1 7.6 4.5100.00 154.9 50.4 3.1

044AS 75.00 116.2 31.8 3.7 3.850.00 77.5 18.9 4.125.00 38.7 8.6 4.5100.00 170.5 56.1 3.0

049AS 75.00 127.9 34.9 3.7 3.750.00 85.3 21.3 4.025.00 42.6 9.8 4.4100.00 186.9 62.1 3.0

054AS 75.00 140.2 38.7 3.6 3.850.00 93.5 22.5 4.125.00 46.7 10.3 4.5


Pressure Drop Curves

Figure 1, Pressure Drops

044A - 054A029 A - 039A

NOMINAL MAXIMUM MINIMUMFlow Pressure Drop Flow Pressure Drop Flow Pressure Drop

Unit (GPM) (L / s) (ft) of water KPa (GPM) (L / s) (ft) of Water KPa (GPM) KPa (ft) of water KPa029A 73.00 4.61 6.6 12.9 122.00 7.70 16.6 49.7 46.00 2.90 2.9 8.6034A 82.00 5.17 8.3 24.8 136.00 8.58 20.6 61.7 51.00 3.22 3.5 10.6039A 93.00 5.87 10.4 31.1 155.00 9.78 26.1 78.0 58.00 3.66 4.4 13.3044A 106.00 6.69 6.8 20.3 176.00 11.10 16.9 50.6 66.00 4.16 2.9 8.7049A 117.00 7.38 8.0 23.9 195.00 12.30 20.1 60.0 73.00 4.61 3.4 10.2054A 130.00 8.20 10.2 30.5 216.00 13.63 25.4 76.0 80.00 5.05 4.3 12.7

Maximum and minimum water flows:

1. Minimum water flow based on -8.89°C (16°F) Delta-T evaporator water temperature dropthrough the evaporator.

2. Maximum water flow based on -14.44 °C (6°F) Delta-T evaporator water temperature dropthrough the evaporator. Operation outside of these ranges is not recommended because erraticcontrol operation may cause evaporator tube expansion due to high water velocity throughevaporator.


Electrical Data

Table 6, Single Point Power Connection DataMinimum POWER SUPPLY Max. Fuse

AGZ Circuit Field Wire Hub orUnit Volts Ampacity Wire Nominal HACR BreakerSize (MCA) Quantity Gauge Quantity Size Size

380 73 3 4 1 1.00 (25) 80029AS 415 73 3 4 1 1.00 (25) 80

380 78 3 3 1 1.25 (32) 90034AS 415 78 3 3 1 1.25 (32) 90

380 85 3 2 1 1.25 (32) 100039AS 415 85 3 2 1 1.25 (32) 100

380 91 3 2 1 1.25 (32) 100044AS 415 91 3 2 1 1.25 (32) 100

380 103 3 2 1 1.25 (32) 125049AS 415 103 3 2 1 1.25 (32) 125

380 112 3 2 1 1.25 (32) 125054AS 415 112 3 2 1 1.25 (32) 125

All Electrical Data notes are on page 13

Table 7, Compressor and Condenser Fan Motor Amp DrawRated Load Amps Locked Rotor Amps

AGZ Compressors No. Of CompressorsUnit Volts No. No. Fan Fan Fan Across-The-LineSize 1 & 3 2 & 4 Motors Motors Motors No.1 & 3 No.2 & 4

(Each) (Each) (Each) (Each) (Each) (Each)380 15.3 15.3 2.0 4 8.5 116 116

029AS 415 15.3 15.3 2.0 4 8.5 116 116380 16.4 16.4 2.0 4 8.5 127 127

034AS 415 16.4 16.4 2.0 4 8.5 127 127380 16.4 19.3 2.0 4 8.5 127 158

039AS 415 16.4 19.3 2.0 4 8.5 127 158380 19.3 19.3 2.0 4 8.5 158 158

044AS 415 19.3 19.3 2.0 4 8.5 158 158380 19.3 23.7 2.8 4 10.7 158 187

049A 415 19.3 23.7 2.8 4 10.7 158 187380 23.7 23.7 2.8 4 10.7 187 187

054A 415 23.7 23.7 2.8 4 10.7 187 187

Table 8, Single Point Power ConnectionWiring to Standard Wiring to Optional

AGZ Power Block Non-Fused Disconnect SwitchUnit Volts Terminal Connector Wire Range Terminal Connector Wire RangeSize Amps (Copper Wire Only) Amps (Copper Wire Only)

380 175 #12 - 2/0 100 #14 - 1/0029AS 415 175 #12 - 2/0 100 #14 - 1/0

380 175 #12 - 2/0 100 #14 - 1/0034AS 415 175 #12 - 2/0 100 #14 - 1/0

380 175 #12 - 2/0 100 #14 - 1/0039AS 415 175 #12 - 2/0 100 #14 - 1/0

380 175 #12 - 2/0 150 #4 - 4/0044AS 415 175 #12 - 2/0 150 #4 - 4/0

380 175 #12 - 2/0 150 #4 - 4/0049AS 415 175 #12 - 2/0 150 #4 - 4/0

380 175 #12 - 2/0 150 #4 - 4/0054AS 415 175 #12 - 2/0 150 #4 - 4/0


Notes for “Electrical Data Single Point” Power:

1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus100% of RLA of all other loads in the circuit.

2. If the control transformer option is furnished, no separate 115v power is required.

3. If a separate 115V power supply is used for the control circuit, then the wire sizing amps is 10amps for this circuit.

4. Recommended power lead wire sizes for 3 conductors per conduit are based on 100% conductorampacity in accordance with NEC. Voltage drop has not been included. Therefore, it isrecommended that power leads be kept short. All terminal block connections must be made withcopper (type THW) wire.

5. “Recommended Fuse Sizes” are selected at approximately 150% to 175% of the largestcompressor RLA, plus 100% of all other loads in the circuit.

6. “Maximum Fuse or HCAR breaker size” is selected using 225% of the largest compressor RLA,plus 100% of all other loads in the circuit.

7. The recommended power lead wire sizes are based on an ambient temperature of 30°C (86°F).Ampacity correction factors must be applied for other ambient temperatures. Refer to theNational Electrical Code Handbook.

8. Unit must be electrically grounded according to national and local electrical codes. Groundinglugs are provided at the power panel.

Voltage Limitations:Within 10 percent of nameplate rating

Notes for “Compressor and Condenser Fan Amp Draw”:1. Compressor RLA values are for wiring sizing purposes only and may be higher than the actual

operating current at unit standard rated operating conditions.

2. If the unit is equipped with SpeedTrol condenser fan motor control, the first motor on eachrefrigerant circuit is a 1 phase, 1 HP motor with a FLA of 2.8 amps and a LRA of 7.3 amps at380/415 volts.

Notes for “Field Wiring Data”1. Requires a single disconnect to supply electrical power to the unit. This power supply must

either be fused or use an HACR type circuit breaker.

2. All field wiring to unit power block or optional non-fused disconnect switch must be copper.

3. All field wire size values given in table apply to 75° C rated wire per NEC.


Figure 2, Typical Field Wiring with MicroTech Controller

U N IT M A INTE R M IN A L B LO C K

D IS C O N N E C T(B Y O T H E R S )

3 P H A S E

P O W E R

S U P P LY

G N D LU G

TO C O M PR ES S O R (S )A N D FA N M O TO R S

FU S E D C O N TR O LC IR C U IT TR AN SF O R M ER

O P T IO N

10AFU SE

N

N B

TB 2

10AFU SE

1(B Y O T H E R S )

(B Y O T H E R S )(B Y O T H E R S )

N

SE PA R AT E EVA P O R ATO RH E ATE R P O W E R

O P TIO N

D ISC O N N EC T

D ISC O N N EC T

(B Y O TH E R S )

(B Y O T H E R S )

13

16

540

545IF S EPA R ATE E VA P O R ATO R

H E ATE R P O W E R O P TIO NIS U S E D - R E M O V E

W IR E S 540 A N D 545.

9

10

5A24V O R 120VAC

120VA CC O N TR O L P O W E R

120VA C

(B Y O T H E R S )

N

C H W P U M P R E LAY(B Y O T H E R S )

S O LID S TATE R E LAY24V O R 120VA C1.5 AM P S M A X.

TB 3

19

28

FA C TO R Y S U P P LIE D A LA R MF IE LD W IR E D

A LAR M B ELLA LA R M B E LL

O PT IO N24VA C

G N DTB 7

140

141

A U TOO FF

M A N U A L

O N

TIM ECLO C K

A M B IE N TTH E R M O S TAT

R E M O TE S TO P(B Y O TH E R S )

C H W F LO W S W IT C H(B Y O TH E R S )

142

143

134

135

133

132

131

4-20 M A FO RC H W R E S E T

(BY O TH E R S )

4-20 M A F O RD E M AN D LIM IT(B Y O T H E R S )

G N D

137

138

139G N D

3

4

5

C O M M U N IC ATIO NP O R T "B "

M JIF R E M O TE STO P C O N TR O LIS U S E D , R E M O V E JU M P E RFR O M TE R M 140 TO 141.

*(C O N N E C TIO N TO R M S(R E M O TE M O NITO R IN G S E Q U E N C E)

O R TO N M P(N ET W O R K M A S TE R PA N E L)

*M IC R O T E C H O N LY

2

C O N TR O LC IR C U IT

FU S E

120 VA C

*

See Note 3 for “Electrical Data Single Point Power” on page 13


Figure 3, Typical Field Wiring Diagram with UNT ControllerU N IT M A IN

TE R M IN A L B LO C KD IS C O N N E C T(B Y O T H E R S )

3 P H A S E

P O W E R

S U P P LY

G N D LU G

TO C O M P R ES S O R (S )A N D FA N M O TO R S

FU S E D C O N T R O LC IR C U IT TR AN S F O R M E R

O P T IO N

10AFU S E

N

N B

TB 2

10AFU S E

1(B Y O T H E R S )

(B Y O T H E R S )(B Y O T H E R S )N

S E PA R AT E E VA P O R ATO RH E AT E R P O W E R

O P TIO N

D IS C O N N EC T

D IS C O N N E C T

(B Y O TH E R S )

(B Y O T H E R S )

13

16

545IF S EPA R ATE E VA P O R ATO R

H E ATE R P O W E R O P TIO NIS U S E D - R E M O V E

W IR E S 540 A N D 545 .

120VA CC O N TR O L P O W E R

120VA C

TB 3

19

28

FA C TO RY S U P P LIE D A LA R MF IE LD W IR E D

A LA R M B E LLA LA R M B E LL

O PT IO N24VA C

G N DTB 7

140

141

A U TOO FF

M A N U A L

O N

T IM EC LO C K

A M B IE N TTH E R M O S TAT

R E M O TE S TO P(B Y O T H E R S )

C H W F LO W S W ITC H(B Y O T H E R S )

142

143

133

134

135

M J

S E E O P T IO N S B E LO W(O N LY O N E S E LE C T IO N

AVA IL . AT A T IM E .)

IF R E M O T E S TO P C O N T R O LO R T IM E C LO C K

IS U S E D , R E M O V E JU M P E RF R O M TE R M 140 TO 141.

2540

C O N TR O LC IR C U IT

FU S E

0-10V -D E M A N D LIM ITTE M P.-Z O N E T E M P.2-10V -R E M O TE R E S E TTE M P.-R ET U R N E VA P. W ATE RTE M P.-*O U TS ID E A IR

*S TA N D AR D S E LE C T IO N

120 VA C

TIM E D E LAY

See note 3 for “Electrical Data Single Point Power” on page 13


Physical Data

Table 9, AGZ 029AS through AGZ 039ASPHYSICAL DATA AGZ MODEL NUMBER

STANDARD EFFICIENCY 029AS 034AS 039ASBASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2

Unit Capacity @ ARI Conditions (1), kW 105.0 121.2 134.9Number Of Refrigerant Circuits 2 2 2

Unit Operating Charge, R-22, kg 13.6 13.6 14.5 14.5 14.5 16.3Cabinet Dimensions, LxWxH, mm 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190

Unit Operating Weight, kg 1576 1601 1626Unit Shipping Weight, kg 1543 1568 1593

Add'l Weight If Copper Finned Coils, kg 200 200 200COMPRESSORS

Type Tandem Scrolls Tandem Scrolls Tandem ScrollsNominal Horsepower of each Compressor 9.0 9.0 10.0 10.0 10.0 13.0

Number Of Compressors per Circuit 2 2 2 2 2 2Oil Charge Per Compressor, g 496 496 496 496 496 496

CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENTStandard Staging - Circuit #1 in Lead

Standard 4 Stages 0-25-50-75-100 0-25-50-75-100 0-22-50-72-100

Standard Staging - Circuit #2 in LeadStandard 4 Stages 0-25-50-75-100 0-25-50-75-100 0-28-50-78-100

CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLINGCoil Face Area, M2 4.3 4.3 4.3 4.3 4.3 4.3

Finned Height x Finned Length, mm 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2

Maximum Relief Valve Pressure Setting, kPa 3103 3103 3103 3103 3103 3103CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE

Number Of Fans - Fan Diameter, mm 4 - 712 4 - 712 4 - 712Number Of Motors - kW 4 - 0.7 4 - 0.7 4 - 0.7

Fan And Motor RPM, 50Hz 950 950 95050 Hz Fan Tip Speed, M/Sec 29.5 29.5 29.5

50 Hz Total Unit Airflow, M3/sec 14.3 14.3 14.3DIRECT EXPANSION EVAPORATOR - BAFFLED SHELL AND THRU-TUBE

Diameter, mm - Length, mm 254 - 1220 254 - 1220 254 - 1220Water Volume, L 38.0 38.0 38.0

Maximum Water Pressure, kPa 1207 1207 1207Maximum Refrigerant Working Pressure, kPa 1552 1552 1552Water Inlet / Outlet Victaulic Connections, mm 101.6 101.6 101.6

Drain - NPT int, mm 9.5 9.5 9.5Vent - NPT int, mm 9.5 9.5 9.5

NOTES:1. Nominal capacity based on 35°C ambient air and 12.2°C - 7.0°C water range.


Table 10, AGZ 044AS through 54ASPHYSICAL DATA AGZ MODEL NUMBER

STANDARD EFFICIENCY 044AS 049AS 054ASBASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2

Unit Capacity @ ARI Conditions (1), kW 153.2 168.6 184.8Number Of Refrigerant Circuits 2 2 2

Unit Operating Charge, R-22, kg 16.3 16.3 19 20 20 20Cabinet Dimensions, LxWxH, mm 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190

Unit Operating Weight, kg 1741 1772 1796Unit Shipping Weight, kg 1696 1722 1751

Add'l Weight If Copper Finned Coils, kg 200 300 300COMPRESSORS

Type Tandem Scrolls Tandem Scrolls Tandem ScrollsNominal Horsepower of each Compressor 13.0 13.0 13.0 15.0 15.0 15.0

Number Of Compressors per Circuit 2 2 2 2 2 2Oil Charge Per Compressor, (g) 496 496 496 496 496 496

CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENTStandard Staging - Circuit #1 in Lead

Standard 4 Stages 0-25-50-75-100 0-23-50-73-100 0-25-50-75-100

Standard Staging - Circuit #2 in LeadStandard 4 Stages 0-25-50-75-100 0-27-50-77-100 0-25-50-75-100

CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLINGCoil Face Area, (M2) 4.3 4.3 4.3 4.3 4.3 4.3

Finned Height x Finned Length, (mm) 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121 2032 x 2121Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2

Maximum Relief Valve Pressure Setting, psig (kPa) 3103 3103 3103 3103 3103 3103CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE

Number Of Fans - Fan Diameter, mm 4 - 712 4 - 712 4 - 712Number Of Motors - kW 4 - 0.7 4 - 1.1 4 - 1.1

Fan And Motor RPM, 50Hz 950 950 95050 Hz Fan Tip Speed, M/Sec 29.5 29.5 29.5

50 Hz Total Unit Airflow, M3/sec 14.3 15.7 15.7DIRECT EXPANSION EVAPORATOR - BAFFLED SHELL AND THRU-TUBE

Diameter, mm - Length, mm 305 - 1220 305 - 1220 305 - 1220Water Volume, L 48.5 48.5 48.5

Maximum Water Pressure, kPa 1207 1207 1207Maximum Refrigerant Working Pressure, kPa 1552 1552 1552Water Inlet / Outlet Vitaulic Connections, mm 101.6 101.6 101.6

Drain - NPT int, mm 9.5 9.5 9.5Vent - NPT int, mm 9.5 9.5 9.5

NOTES:1. Nominal capacity based on 35°C ambient air and 12.2°C - 7.0°C water range.


Dimensional Data

Figure 4, Dimensions AGZ 029A through AGZ 054A

AB

X

F

Y

1 3. 123 33 .21 5. 123 84 .0

7 8. 882 00 3 .6

8 0. 882 05 4 .4

TY P I C A L S PA C IN G F O R 1 .0 / 25 .4D IA M E T E R IS O L ATO R / M O UN TI NGH O L E L O C ATI O N S (4 )

8 8. 122 23 8 .2

9 4. 002 38 7 .6

6 .5 01 65 .1

3 1. 508 00 .1

2 .0 05 0. 8

2 .0 05 0. 8

C

D

E

A IR D IS CH A R G E A IR D IS CH A R G E

C O N TR O LC E NT E R P O W E R C E NT E R

P O W E R E N TR YL O C ATI O NTH IS S ID E O NLY. O P T IO NA L

C O IL G U A RD S

IN L E T O U TL E T

E VA P O RA TO R2 REF RIG ERANT CIR CUIT S

C O M P R E S S O R # 1




N O TE :

1 . A L L D IM E N S IO N S IN I NC H E S / m m .2 . A L L U N ITS HA V E (2 ) IN D E P E N DE N T R E FR IG E RA N T C IR CU IT S .

4 "/ 10 7 m m V ICTA U LI CC O N N E CT IO N S F U RN IS H E DW I TH G RO O V E S F O R V I CTA U LI CC O U P L IN G S B Y O T HE R S

Z3 3. 368 47 .3

5 .5 01 39 .7

U NI T I S O L ATO R/M O U N TI NG H O L EL O C ATI O N S (4 )(2 ) P E R S I DE A SS H O W N

2 .5 "/ 63 m m DI A M E TE RL IFT IN G HO LE S (4 )(2 ) P E R S I DE A S S H O W N

C O N TR O L W IR IN GE N TR Y K N O C K O U TSFO R 1 /2 " / 1 3 m mC O N D UI T, AT B A C KO F C O N TR O L B O XO N C O NT RO L S ID E

AGZ Dimensions mm Center of Gravity Unit Weights kgs. Additional WeightMODEL inch / mm for Units with CopperNumber A B C D E F X Y Z Operating Shipping Fin Coils kg

029A 2190 2075 1565 566 134 381 1115 1021 920 1575 1540 200034A 2190 2075 1565 566 134 381 1115 1021 920 1600 1565 200039A 2190 2075 1565 566 134 381 1115 1021 920 1625 1590 200044A 2190 2075 1565 566 108 406 1115 1036 904 1740 1695 200049A 2190 2075 1565 566 108 406 1115 1036 925 1770 1720 200054A 2190 2075 1565 566 108 406 1115 1036 925 1795 1750 200


Application Data

Unit PlacementAGZ units are for outdoor applications and can be mounted either on a roof or at ground level. Forroof mounted applications, install the unit on a steel channel or I-beam frame to support the unitabove the roof. For ground level applications, install the unit on a substantial base that will not settle.A one piece concrete slab with footings extended below the frost line is recommended. Be sure thefoundation is level (within 13mm (1/2") over its length and width). The foundation must be strongenough to support the operating weights listed in Table 9 and Table 10.

On ground level applications protect fins against vandalism using the optional coil guards or byerecting a screen fence. The fence must allow free flow of air to the condenser coil for proper unitoperation.

ClearancesDo not block the flow of air to and from the condenser coil. Restricting airflow or allowing airrecirculation will result in a decrease in unit performance and efficiency because discharge pressures

are increased. There must be no obstruction above the unitthat would deflect discharge air downward where it could

be recirculated back to the inlet ofthe condenser coil. The condenserfans are propeller type and will notoperate with ductwork on the fanoutlet.

Install the unit with enoughside clearance for air entrance tothe coil and for servicing. Provideservice access to the evaporator,compressors, electrical controlpanel and piping components.

Do not allow debris toaccumulate near the unit. Airmovement may draw debris intothe condenser coil causing coilstarvation. Give specialconsideration to low ambientoperation where snow canaccumulate. Keep condenser coils and fan discharge free of snow or other obstructions to permitadequate airflow for proper unit operation.

Figure 5, Clearances1220m m (4 ft)C learance for

A ir In le t

1220m m (4 ft)C learance for

A ir In le t


Service A ccess


Evaporato rTube Removal

3048m m

2438m m


Sound IsolationThe ultra-low sound levels for the AGZ chiller is sufficient for most applications. However, therewill be applications where sound generation may be an issue. The most effective isolation method isto locate the unit away from sound sensitive areas. Avoid locations beneath windows or betweenstructures where normal operating sounds may be objectionable. Reduce structurally transmittedsound by isolating water lines, electrical conduit and the unit itself. Use wall sleeves and rubberisolated piping hangers to reduce transmission of water or pump noise into occupied spaces. Useflexible electrical conduit to isolate sound through electrical conduit. Spring isolators are effective inreducing the low amplitude sound generated by scroll compressors and for unit isolation in soundsensitive areas.

Typical Chilled Water PipingFlush the system water piping thoroughly before making connections to the unit evaporator. Install astrainer of 40 mesh in the return water line before the inlet to the chiller. Design the water piping sothe chilled water circulating pump discharges into the evaporator inlet.

Connect the return water line to the evaporator inlet connection (the connection closest to thecompressors). Connect the supply water line to the evaporator outlet connection.

Install a flow switch in the horizontal piping of the supply (evaporator outlet) water line.

Provide drain connections at low points in the system to permit complete drainage of the system.Locate air vents at the high points in the system to purge air out of the system. A vent connection ontop of the evaporator vessel allows air to be purged out of the evaporator. Purge air from the watersystem before unit start-up to ensure adequate flow through the evaporator.

Install pressure gauges in the inlet and outlet water lines to the evaporator. Measure pressuredrop through the evaporator and compare to flow as shown in Figure 6. Vibration eliminators arerecommended in both the supply and return water lines.

Insulate chilled water piping to reduce heat loss and prevent condensation. Chillers not runningin the winter should have their water systems thoroughly drained to protect against freezing. If thechiller operates year round, or if the system is not drained for the winter, protect the chilled waterpiping exposed to outdoor temperature against freezing. Wrap the lines with a heater cable and addproper amount of glycol to the system to further protect the system.

The total water volume in the system should be sufficient to prevent “on-off” cycling. Turnoverrate should not be less than 15 minutes for normal variable loads. Turnover for constant loadapplications should not be less than 6 minutes.

Chilled Water PipingThe thermostat sensor is factory mountedin the leaving water well. If an optionalhigh return water sensor is provided,install sensor bulb in a field supplied teeor strap to the outside of the water line.

Figure 6, Typical chilled water piping


Series Compared to Parallel OperationConsider system pressure drop when designing the water piping. Parallel piped systems have half ofthe total system flow going through the evaporator of each chiller, reducing the individual unit andtotal system pressure drop.

Series piped evaporators require that the total system water flows through both evaporators. Not onlyis the pressure drop through each evaporator increased but the pressure drops must be added togetherto obtain the total evaporator pressure drop. Series piped evaporators normally require largercirculating pumps for the chilled water system.

Temperature and Water Flow LimitationsAGZ units are designed to operate in temperatures from -4.5 °C (40°F) to 46°C (115°F). A lowambient option with SpeedTrol allows operation down to -18°C (0°F). The minimum ambienttemperature is based on still conditions where the wind is not greater than five mph. Greater windvelocities will result in reduced discharge pressure, increasing the minimum operating ambienttemperature. Field installed wind baffles are available. The baffles allow the chiller to operateeffectively down to the ambient temperature for which the unit was designed. Evaporator flow ratesshould be kept within the minimum and maximum flows shown on page 11.

Evaporator flow rates below the minimum values may result in laminar flow causing freeze-upproblems, scaling and poor control. Flow rates above the maximum values will result in unacceptablepressure drops and may cause excessive nozzle and tube erosion, potentially leading to failure.

Evaporator Freeze ProtectionEvaporator freeze-up can be a concern in the application of air-cooled water chillers. To protectagainst freeze-up, insulation and an electric heater cable on the evaporator are furnished with the unit.This protects the evaporator down to -29°C (-20°F) ambient. Although the evaporator is equippedwith freeze protection, it does not protect water piping external to the unit or the evaporator if there isa power failure or heater cable burnout. Consider the following recommendations for additionalprotection.

1. If the unit will not be operated during the winter, drain evaporator end chilled water piping.Drain and vent connections are provided on the evaporator to ease draining.

2. Add a glycol solution to the chilled water system to provide antifreeze protection. Freeze pointshould be approximately ten degrees below minimum design ambient temperature.

3. Bypass water from the heating system through the evaporator when the unit is shutdown duringthe winter months. This can be accomplished by a small circulating pump arranged to operateindependently of the heating system and piped to maintain a small flow of water continuouslythrough the evaporator. Be careful not to overheat the evaporator water.

The evaporator heater cable is wired to the 115 volt circuit in the control box. This power should besupplied from a separate source, but it may be supplied from the control circuit. Operation of theheater cable is automatic through the ambient sensing thermostat which energizes the evaporatorheater cable for protection against freeze-up. Unless the evaporator is drained in the winter, thedisconnect to the evaporator heater must not be open.


Optional Features

Control Circuit TransformerFor applications where a separate 115 volt power source is not available, the transformer is factoryinstalled and wired between the line voltage power terminal block and the 115 volt control circuit.

Hot Gas BypassHot gas bypass permits unit operation down to 10% of full load capacity. This option includes a hotgas bypass valve, solenoid valve, and manual shutoff valve for each circuit.

GaugesOptional factory mounted gauges include high side and low side refrigerant gauges for eachrefrigerant circuit. (Included feature as part of the MicroTech display option.)

High Return Water Staging ThermostatOptional factor installed high return temperature unloader thermostat senses high return watertemperatures at startup and unloads the refrigerant circuit to avoid unit shutdown due to compressormotor overload. Field location of the thermostat bulb is required. (Included feature as part of theMicroTech display option.)

High Ambient Staging PressurestatOptional factory installed high ambient unloader pressurestat senses head pressure exceeding 2586kPa (375 psig) and unloads the refrigerant circuit to keep head pressure below maximum limits. Thisfeature allows unit to run part loaded instead of shutting unit down due to high head pressure.(Included feature as part of the MicroTech display option.)

SpeedTrol Head Pressure ControlOptional SpeedTrol head pressure control allows unit operation down to -18°C (0°F).

Protective Coil GuardsOptional factory installed vinyl-coated welded wire coil guards provide all-around fin protection onground level installations. Base guards for compressor and tubing protection.

Copper Fin Condenser CoilsCopper fin condenser coils are available as an option on all models.

Disconnect SwitchA factory installed service use, non-fused disconnect switch (mounted inside the power section ofcontrol box) is available with single point power supply.


Circuit BreakersFactory installed circuit breakers are available on unit with single or multiple point power supply.This option provides unit installed compressor short circuit protection and makes servicing easier.

Phase Loss/Voltage ProtectionTwo levels of phase failure protection are available as a factory installed option to guard againstcompressor motor burnout:

• Phase loss with under/over voltage protection

• Phase loss with under/over voltage protection and multiple LED indication of fault type

Water Flow SwitchA water flow switch is available for field installation in the chilled water piping to prevent evaporatorfreeze-up under low or no flow conditions. Terminals are provided in the unit control center for fieldhook-up of the water flow safety switch. If this option is not ordered with the unit, then a fieldsupplied water flow switch is required.

Time ClockA 24 hour time clock for remote field installation for night shutdown is available. The time clock isfield connected to the remote shutdown terminals provided in the unit control center. A time clock isalso available with a spring carry-over. During normal operation, the spring is wound to operate theclock for up to 10 hours should power be lost to the unit

Vibration IsolatorsSpring vibration isolators are available for field installation to reduce vibration transmission throughthe unit base.

Chilled Water ResetIn applications when outside temperature effect load of the building, outdoor air reset can be providedto increase the system efficiency. The amount of reset is adjustable between 3°C and 11°C (5°F and20°F).

Zone Terminal DisplayStandard global UNT controller. (Not available on MicroTech option.)

MicroTechThe control panel contains a Model 250-6 microprocessor based controller. The operator can reviewand change operating parameters from the interface keypad. The interface keypad has twelve inputkeys and a two line by sixteen character display. The system is protected by a simple passwordscheme allowing access to authorized personnel. A valid password must be entered before anysetpoints can be changed.

MicroTech continuously performs self-diagnostic checks and will automatically shutdown acompressor, a refrigerant circuit, or the entire unit should a fault occur. The cause of the shutdownwill be retained in memory and can easily be displayed for operator review. The MicroTechcontroller will also retain and display the time the fault occurred and the operating conditions thatwere present at the time of the fault. In addition to alarm diagnostics, the controller also provides theoperator with a warning of pre-alarm conditions.


Personal Computer MonitoringMicroTech Monitor software may be used on the customers personal computer to communicate withthe MicroTech controller. The controller connects directly or remotely over phone lines with anoptional modem.

Dual Setpoint Control(Ice storage applications)Factory supplied with microprocessor based dual setpoint control. A field supplied time clock willdetermine whether the chiller operates in normal or ice mode.

Cycle Counter and Run Hour MeterFactory installed keypad selectable cycle counters and hour meters are available for each compressor.


Product Specification

SECTION 15XXX

50 Hz AIR-COOLED SCROLL COMPRESSOR CHILLERSAGZ 029A - AGZ 054A

PART 1 - GENERAL

1.01 SUMMARY

Section includes design, performance criteria, refrigerants, controls, and installationrequirements for air-cooled scroll compressor chillers.

1.02 REFERENCES

Comply with applicable Standards/Codes of ANSI/ASHRAE 15, ASME Section VIII, NEC,

and OSHA.

1.03 SUBMITTALS

A. Submit shop drawings and product data in accordance with the specifications.

B. Submittals shall include the following:

1. Dimensioned plan and elevation view drawings, required clearances, and

location of all field connections.

2. Summary of all auxiliary utility requirements such as: electricity, water,

compressed air, etc. Summary shall indicate quality and quantity of each

required utility.

3. Single line schematic drawing of the power field hookup requirements,

indicating all items which are furnished.

4. Schematic diagram of control system indicating points for field

interface/connection.

5. Diagram shall fully delineate field and factory wiring.

6. Installation manuals.

1.04 QUALITY ASSURANCE

A. Qualifications: Equipment manufacturer must specialize in the manufacture of the

products specified and have five years experience with the equipment and

refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified.

C Chiller manufacturer plant must be ISO9002 Registered.


1.05 DELIVERY AND HANDLING

A. Chillers shall be delivered to the job site completely assembled and charged with

refrigerant and oil by the manufacturer.

B. Comply with the manufacturers instructions for rigging and handling equipment.

1.06. WARRANTYThe refrigeration equipment manufacturer’s warranty shall be for a period of one year from

date of equipment start up but not more than 18 months from shipment. The warranty shall

cover material and workmanship that prove defective within the above period, excluding

refrigerant.

1.07 MAINTENANCEMaintenance of the chillers shall be the responsibility of the owner and performed in

accordance with the manufacturer’s instructions.

PART 2--PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. McQuay International

B. (Approved Equal)

2.02 UNIT DESCRIPTION

Provide and install as shown on the plans factory assembled, factory charged, and factory

run tested air-cooled scroll compressor packaged chillers in the quantity specified. Each

chiller shall consist of hermetic tandem scroll compressors, multi-circuit direct expansion

evaporator, air-cooled condenser section, control system and all components necessary for

safe and controlled unit operation.

2.03 DESIGN REQUIREMENTS

A. General: Provide a complete scroll compressor packaged chiller as specified herein

and as shown on the drawings . The unit shall be in accordance with the standards

referenced in section 1.02 and any local codes in effect.

B. Performance: Refer to the schedule of performance on the drawings. The chiller

shall be capable of stable operation to a minimum of 30 percent of full load without

hot gas bypass . Performance shall be in accordance with ARI Standard 590.

C. Acoustics: Sound pressure levels for the unit shall not exceed the following

specified levels. The manufacturer shall provide the necessary sound treatment to

meet these levels if required. Sound data shall be provided with the quotation and

be measured at 30 feet from the unit and one meter above the unit base line

Octave Band

63 125 250 500 1000 2000 4000 8000 dBA


2.04 CHILLER COMPONENTS

A. Compressors: The compressors shall be two sets of tandem hermetic scroll type

with discharge service valve, crankcase oil heater and suction strainer.

Compressors shall have a forced feed lubrication system with a reversible oil pump

and factory oil charge. The compressor motors shall be refrigerant gas cooled, high

torque, hermetic induction type, two-pole, with inherent thermal protection on all

three phases and shall be mounted on RIS vibration isolator pads.

B. Evaporator: The evaporator shall be direct expansion, shell and tube with carbon

steel shell and high efficiency copper tubes rolled into steel tube sheets. Internal

baffles shall be polypropylene. The refrigerant heads shall have multi-pass baffles

to insure oil return and be removable to permit access to the tubes from either end.

The shall be insulated with 19mm (3/4 inch) closed cell polymer insulation with a

minimum K factor of 0.28 at 23°C (75°F) and be heated with an electric heater to

provide freeze protection to -29°C (-20°F) ambient temperature. The refrigerant

side working pressure shall be at least 1552 kPa (225 psig). The water side

working pressure shall be at least 1207 kPa (175 psig) The evaporator must be

designed, constructed, inspected, and stamped according to the ASME Code.

C. Condenser: The condenser coils shall consist of 10mm (3/8 inch) seamless copper

tubes mechanically bonded into plate type fins. The fins shall have full drawn

collars to completely cover the tubes. A subcooling coil shall be an integral part of

the main condenser coil. Condenser fans shall be propeller type arranged for

vertical air discharge and individually driven by direct drive fan motors. Each fan

shall be in its own compartment to eliminate cross flow of condenser air during fan

cycling and shall be equipped with a heavy-gauge vinyl coated fan guard. Fan

motors shall be weather protected, three-phase, direct-drive, 950 rpm, open drip-

proof type.

D. Refrigerant Circuit: The refrigerant circuit shall include a liquid line shutoff valve,

refrigerant filter-drier, sight glass with moisture indicator, liquid line solenoid valve

(no exceptions), thermal expansion valve, and insulated suction line.

E. Control System: A centrally located weatherproof control panel shall contain the

field power connection points, control interlock terminals, and control system.

Power and starting components shall include factory fusing of fan motors and

control circuit; individual contactors for each fan motor, solid-state start timer,

solid-state three-phase motor overload protection, inherent fan motor overload

protection and unit power terminal blocks for connection to remote disconnect

switch. Terminals shall also be provided for power supply to the evaporator heater

circuit. Hinged access doors shall be lockable. Barrier panels are required to

protect against accidental contact with line voltage when accessing the control

system. The operating and safety controls shall be:


Global UNT microprocessor based control that accomplishes unit capacity

control by 4-stage cross-circuit compressor cycling based on leaving chilled water

temperature. Set point and control band shall easily field adjusted and anti-cycling

and stage delay relays are to be included. Safety controls shall include low and

high refrigerant pressure safeties , low evaporator flow, sensor failures, and

evaporator freeze protection. Motor protection shall include phase voltage, volts

ratio, and solid state compressor motor protection. The controller shall be equipped

with a Zone Terminal option that provides an onboard LCD display of unit

operating parameters and adjustment of any optional controls.

- OR -

MicroTech microprocessor control with a 12 key keypad and 4-line, 40 character

backlit liquid crystal display operator interface. The controller shall continuously

perform self diagnostic checks on all system temperatures, pressures, and safeties,

and automatically shut down a circuit or the entire unit at fault conditions. The

cause, time, and date of the occurrence shall be recorded and displayed along with

availability to view the seven previous incidents.

The controller shall take proactive measures to stay on-line for non critical

abnormalities; staging down capacity, activating a pre-alarm signal and

automatically switching to the alarm menu on the display. These pre-alarms shall

be self clearing when the off-condition is corrected.

Critical shutdown alarms such as high condenser pressure, freeze protection, and

low evaporator pressure shall be manual reset and cleared at the keypad to resume

operation.

The refrigerant discharge pressure shall be controlled by a FanTrol system that

cycles condenser fans based on discharge pressure and shall be operational 4.4°C

(40°F).

- OR -

The refrigerant discharge pressure shall be controlled by a SpeedTrol control

employing both fan cycling and fan speed control and allow operation to

-18°C (0°F).

F. The unit base and coil supports shall be fabricated from heavy gauge steel

and painted with weatherproof paint. Incidental supports may be galvanized.


2.05 OPTIONS AND ACCESSORIES

The following options are to be included:

• Hot gas bypass on all circuits

• Low ambient, variable speed, head pressure control to -17.8°C (0°F)

• Copper fin condenser coils

• Wire mesh coil guards to provide fin protection

• Chilled water flow switch to be field mounted in the chilled water line and field wired to

terminals in the control panel

• Spring vibration isolators for field installation

• Control circuit transformer

• Factory mounted refrigerant pressure gauges for each circuit

• High return water staging thermostat to prevent compressor overload due to warm water

starts

• High ambient staging thermostat to prevent compressor overload due to unusually high

ambient temperatures

• Dual setpoint control switched by a remote signal from the building control system.

• Factory installed non-fused disconnect switch mounted in the unit control panel

• Factory installed circuit breaker to provide unit short circuit protection

• Phase loss with under/over voltage protection and with LED indication of the fault type.

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install in strict accordance with manufacturer’s requirements, shop drawings, and

contract documents.

B. Adjust and level chiller in alignment on supports.

C. Coordinate electrical installation with electrical contractor.

D Coordinate controls with control contractor.

E. Provide all equipment required to ensure a fully operational and functional chiller.

3.02 START-UP

A. Ensure proper charge of refrigerant and oil.

B. Provide testing, and starting of machine, and instruct the Owner in its proper

operation and maintenance.

END OF SECTION


Notes

13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330

air-cooled global chiller - daikin appliedalarms are self clearing when the fault condition is...

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