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AW-DDirect Fired Units

Typical ApplicationsThe Price AW-D series provides

continuous superior control for

maintaining space temperature

and highest quality for demanding

ventilation applications. The 30:1

turndown will save energy, improve

space control, and increase product

life for make-up air applications in the

commercial and industrial space. The

custom flexibility makes the AW-D

the perfect solution for replacing

aged equipment by fitting directly on

existing curbs and ducts.

CONFIGURATION OPTIONS

•Outputrange(MBH):20–12,000MBH

•AirflowRange(CFM):1,000–100,000

•Turndown:30:1

•MinimumThermalEfficiency:92%

Product HighlightsGas Fired Make-up air units have become one of the most crucial elements in the design of modern projects. With growing environmental awareness and increasing requirements of the authorities, industry demands the highest comfort with minimum environmental impact possible from HVAC manufacturers.

Price Mechanical’s AW-D Series for Direct Fired Gas Make-up air Units are a customized design of the highest standards of quality, safety and sustainability. With Price’s deep knowledge & market centric approach, Price Mechanical is committed to provide energy efficient and superior quality products.

There is a huge requirement from the contractors for ready-to-connect customized makeup air systems in the industry to reduce construction times. Our automated production processes and design flexibility allows us to meet short delivery times.

The AW-D Series are well engineered to cut back the initial investment, running costs and maintenance, thereby increasing the total life cycle value of the product.

Make-up air is generally required to replace air exhausted from the building, balance building pressurization and/or to maintain acceptable indoor air quality (IAQ). In many cases all three requirements can be met by a ventilation unit:

• Replacement

• Waste-water treatment plants

• Condominiums & hotels

• Transportation & garages

• Restaurant & kitchens

• Warehousing

• Manufacturing Process

• Paint shops

Unit TypeDirect fired units heat large spaces by burning natural gas or propane directly in the airstream. This method eliminates the heat exchanger and increases the thermal efficiency of the heat transfer. Price Mechanical AW-D units have evolved with the use of ultra-efficient burners allowing a better control over discharge temperature. These systems achieve 100% combustion efficiency and a 92% overall thermal efficiency (8% of the total heat goes into the latent heat of water formed by combustion).

In typical make-up air applications like kitchens and paint booths, large quantities of fresh air is balanced with exhaust airflow.

Price units are designed, tested and CSA certified in accordance with ANSI Z83.4 / CSA3.7, which require levels of combustion products generated by the heater as follows:

• CO shall not exceed 5.0 ppm

• NO2 less than 0.5 ppm,

• CO2 less than 4000 ppm

AirflowThe first step in the design process is to establish the required make-up airflow rate (cfm).

• The exhaust airflow rate is established by adding up the exhaust airflow rates from all exhaust fans located within the design space. These can include bathroom exhaust, kitchen exhaust, laundry exhaust, etc.

• Building pressurization is desirable to minimize infiltration that can lead to poor occupant comfort and IAQ issues. Building pressurization calculations can be complex and are best left to the design engineer.

• Providing ventilation air to maintain acceptable indoor air quality is typically based on ASHRAE Standard 62 for commercial spaces.

AW-D-2v001

DesignThe heatingrequirement is based on the airflow rate and the temperature rise;

Qinput = (1.08×Temperature Rise×Airflow Rate) / 0.92

WHERE:

Qinput = Required Heat Input, (Btu/hr)

1.08 = A Constant based on the specific properties of moist air at 70°F db and 50% RH, ((Btu∙min)/(°F∙ft³∙hr))

TemperatureRise = Increase of temperature from unit input to output (ΔT, Tout - Tin), (°F)

AirflowRate = Flow rate of air being heated (CFM), (ft³/min)

0.92 = Thermal efficiency of combustion

The inlet temperature is typically the winter design temperature, and can be determined from weather data in the ASHRAE Fundamentals Handbook. Price units can operate with supply air temperatures down to -40°F (-40°C).

The discharge temperature will depend on the application. In many cases, the design intent is to provide neutral air to the occupied space, so 70 to 75°F is common. The maximum discharge temperature is restricted to 160°F. However, the Temperature Rise (Tout – Tin) can be up to 120°F for Direct Fired units.

The fuelrequirement is based on the Heat Input.

Fuel Flow Rate = Qinput/HHVFuel

WHERE:

FuelFlowRate = Volumetric Fuel Flow Rate (ft³/hr)

Qinput= Required Heat Input, (Btu/hr)

HHVFuel= Higher Heating Value of the Fuel (Natural gas = 1000 Btu/ft³)

The natural gas flow rate or heat input can be used for sizing gas piping to the unit. It is not recommended that the gas pipe connection size be used to size the piping. The pipe size will depend on the pressure loss of the field piping, the gas flow rate and the available gas inlet pressure.

Capacity ControlAW-Ds provide a fully modulating 30:1 turn down ratio. Providing this high of turndown and a fully modulating system, the unit will provide precise temperature control to the space which results in the highest quality IAQ and comfort. This smooth operation also maximizes the life of the equipment in lieu of constantly staging valves and stopping and starting fans. The modulation is achieved by the 2 main components:

a. Controlling the fuel gas flow through the valve

b. Setting and adjusting profile plates to maintain proper velocities across the burner

The discharge air temperature sensor will control the gas valve through the controller to provide precise discharge air temperature control.

The higher turndown allows the unit to operate at a lower temperature rise and minimizes the cycling of the burner system and maintains a constant discharge air temperature control.

For example a make-up air unit with a design temperature rise of 100°F and 10:1 turndown can operate down to 10°F rise before the unit will cycle on and off to meet the heating load; whereas a 30:1 turndown can operate down to a 3.3°F.

Gas BurnersPrice Mechanical AW-Ds use 2 stage combustion burners which lower CO and NO2 emissions. These burner sections are available in cast iron, aluminum or nickel plated with diverging stainless steel baffle plates.

The burners are located in a drawthrough airflow configuration. The profile plates establish uniform air velocities across the burner. Typical velocity required across the burner is 2850 fpm, in order to avoid incomplete combustion and high level of waste gases. These burners can operate in the range of 1500 to 3500 fpm. Side plates are used to adjust velocities across the burner. For VAV applications, modulating dampers will be used to maintain the appropriate air velocity over the burner. The air modulation on Price direct fired equipment is limited to 50% of design airflow.

Figure 1: Example of airflow for an Direct Fired Unit

AW-D-3For more information visit www.priceindustries.comv001

Price offers flexibility in configuration of different burner sections of 6” and 12”, thereby meeting the required dimensions and capacity while directly fitting into.

AltitudeAltitude will impact the heat capacity of the unit because less dense air has less oxygen for combustion. The capacity of units is based on sea level, and will be acceptable up to 2,000 ft. The unit capacity will be de-rated by 4% for every 1,000 ft. above 2,000 ft. For example, a unit selected for Denver at 5,000 ft. elevation will be de-rated by 12% [4% x (5,000 ft. - 2,000 ft.)/1,000 ft.].

Gas TrainGas trains are designed to meet strict gas code requirements (please see Figure 2). They all have the following basic components:

• FieldInstalledMainManualGasShut-OffValve – This valve is field installed outside the unit so the gas can be shut off to all components along with the make-up air unit. This is similar to an electrical disconnect switch. For shipping reasons, it cannot be factory installed. While it is a requirement of the gas code and should be installed by the contractor, it is also a good idea to show this detail on the drawings.

• MainLineGasPressureRegulatorValve – This valve maintains the gas pressure at the make-up air unit within rated parameters.

• MainLineAutomaticGasValves – These are

the main shut-off valves that open when heat is required. They are generally two position on-off type. The requirements change depending on the furnace size. Under 1 million Btu/h, two redundant gas valves are acceptable. Gas trains are designed to meet strict gas code requirements. The gas manifold is designed based on the specified pressure ranging from 4.2 to 8 inch w.c. for natural gas & propane gas from 1.6 to 3 inch w.c.

• MainLineModulatingValve – This is the valve that permits modulating heat control. As the unit’s controller translates the change in required supply air output temperature, the modulating valve adjusts the fuel flow rate into the burner.

• MainLineGasModulatorRegulatorValve – For capacities over 1000 MBH, the pressure regulator valve and modulating gas valve is replaced with a single modulator regulator (MR) valve which provides dual function of modulation and pressure regulation. These valves use counter spring to keep the valve in closed position despite the downward pull of the negative pressure.

• MainFiringManualShut-OffValve – This valve allows a service technician to shut off gas to the burner, but not the pilot burner.

• Pilot LineManual Shut-Off Valve – This valve allows a service technician to shut off gas to the pilot, but not the main burner.

• PilotGasValve – The pilot lets a small amount of fuel enter the burner during start up. This fuel is typically ignited with an electronic

ignition system. On larger burners, a pilot flame is used to light the main flame. Once the pilot is lit and flame is proven, the main gas valves will open.

The exact design of the gas train will depend on the model and size. For smaller products, some of the components listed above are combined into a single piece.

Fan SelectionFan selection is based on the required airflow (cfm) and the total static pressure (in. w.c.). The total static pressure is established as follows;

Total Static Pressure (TSP) = External Static Pressure (ESP) + Internal Static Pressure (ISP) (in. w.c.)

The ESP is calculated by the designer based on the airflow rate and duct design. This process is well documented in the ASHRAE handbooks. It should cover all static losses from the discharge of the unit to the space being served.

The ISP is calculated based on pressure drops of the components within the make-up air unit, including filters, dampers, heat exchangers, cabinet losses, etc. These losses are established through testing. Note that Price uses the average filter pressure drop to estimate the ISP. Clean filters will allow slightly more air to pass through, while dirty filters will allow slightly less.

With the TSP and supply airflow established, the fan curves for the available fan models are calculated using the vendor supplied fan selection software. The actual fan selection is a judgment that balances performance, efficiency

Figure 2: Gas Manifold

AW-D-4v001

Example of a Single Fan

Figure 4: Fan Curve

8

7

6

5

4

3

2

1

0

1.4

1.2

1

0.8

0.6

0.4

0.2

0

Bra

ke P

ow

er (

hp

)

Volume (cfm)

Sta

tic

Pres

sure

(in

. w.c

.)

4000 6000 8000 10000 12000 1400020000

Inputs: Altitude: 0 | Airflow: 8000 | TSP: 1.10 | Fan Size: 18/18

Legend: Fan Curve System Curve Brake Power Curve

and operating position on the fan curve (Figure 4). Standard rubber-in-shear style isolators are provided, with options for 1” or 2” spring isolation as required. Refer to page 12 for typical clearances required.

ControlsPrice units come standard with unit mounted controls. Unit controls include;

• Unit On-Off

• Heat Off-Enable

• Supply air temperature set point

A duct mounted temperature sensor is supplied loose for field installation in the ductwork approximately 10 feet from the unit supply air opening. A remote control panel is also available, which can be mounted inside the building for ease of operation.

Unit PlacementPrice units can be installed outdoors on a curb, housekeeping pad or sleepers. Designers should ensure there is suitable structural support for the weight of the unit. Supply air connections can be either down flow, up flow, side discharge or end discharge. Units should have enough space around them to allow for proper service, and should avoid having combustible materials too close to the unit. Specific distances are called out on the rating plate, but using a minimum of 12 inches is generally acceptable.

The controls cabinet will require at least 3 feet of access. Access doors can be ordered for either side of the unit (left or right hand). A service distance of 24 inches opposite the main access side is desirable, but the unit can be placed closer to obstructions if necessary.

Roof curb detail #1 and #2

WOODEN NAILER

3/8X1/2 NC

NUTS

BOLTS SUPPLIED FOREACH CORNER C/WLOCKWASHERS AND

CORNER BOLTING ASSEMBLY DETAIL #1

.23

NEOPRENE GASKET

WOODEN NAILER

UNIT

FLASHING

ROOFING PAPER

(BY OTHERS)

CANT STRIP (BY OTHERS)

ROOF CURB CROSS SECTION

(BY OTHERS)

OR CAULKING (BY OTHERS)

INSULATION (BY OTHERS)

197.50

24.00

195.00

57.50 55.00

FILE LOCATION: C:\Users\psirattananamvong\Desktop\Wade-catalog roof curb details\ LAST SAVED BY: psirattananamvong DATE: 10/25/2016 10:16:30 AM

WOODEN NAILER

3/8X1/2 NC

NUTS

BOLTS SUPPLIED FOREACH CORNER C/WLOCKWASHERS AND

CORNER BOLTING ASSEMBLY DETAIL #1

.23

NEOPRENE GASKET

WOODEN NAILER

UNIT

FLASHING

ROOFING PAPER

(BY OTHERS)

CANT STRIP (BY OTHERS)

ROOF CURB CROSS SECTION

(BY OTHERS)

OR CAULKING (BY OTHERS)

INSULATION (BY OTHERS)

197.50

24.00

195.00

57.50 55.00

FILE LOCATION: C:\Users\psirattananamvong\Desktop\Wade-catalog roof curb details\ LAST SAVED BY: psirattananamvong DATE: 10/25/2016 10:16:30 AM

Detail #1: Corner Bolting Assembly Detail #2: Roof Curb Cross Section


AW-D-6v001

AW-D Components

Product Features

100% Outdoor Air Hood and Inlet• 18 gauge painted galvanized steel

• Half inch expanded metal bird screen

• Motorized two position damper

- Optional Modulating inlet damper

- Optional Inlet Louver

Filters• 2 inch filter rack

• MERV 8, hi-temp and washable media filters available

• MERV 14 Filters available – Contact factory

Fans• High efficiency forward curved DWDI fans

• Greasable pillow block bearings

• Adjustable motor mount base

• Fan skid mounted on RIS isolators, spring isolation optional

Furnace• Direct fired burner with stainless steel baffle

plates

• 30 to 1 turndown

• Operates down to -40°F ambient

• Single point piping connection

• CSA certified for Canada and USA

Cabinet – 1 inch standard designs available • 18 gauge painted galvanized steel single

wall construction

- Panel seams are turned inward for clean appearance

- 1 inch (2 inch optional),, 1 ½ lb. density glass fiber insulation (pinned and glued)

• 20 gauge painted galvanized steel casing with 22 gauge liner

- 1 inch foam injected panel (2 inch option available)

- Offers lower leakage than glass fiber insulation

- Increased rigidity

- 1 inch (2 inch option available), 1 ½ lb. density glass fiber insulation in heat exchanger section

Dampers• Triple-vee roll formed galvanized steel

blades

• Optional low leak aluminum airfoil or insulated airfoil dampers

Doors• Double walled construction designed with

similar construction to unit cabinet

- Either 1 inch, 1½ lb. density glass fiber insulation or 1 inch foam injected panels

• Hinged doors supplied for fan, filter, and controls sections

Controls• Standalone temperature controls

• Optional DDC controls can be integrated into building automation system

Disconnect• Non-fused and fused disconnect available

• Single point power connection

Base• 6” Formed Steel base frame

• 4” and 6” Structural Steel base frame

Fans

Filters

Burner

100% Outdoor Air Hood & Inlet

Custom Engineered Cabinet

Controls

Disconnect

Dampers

Doors

Customizable Base


Product OptionsFan IsolationFans used in Price MUA units come standard with Rubber in Shear (RIS) isolation. Price offers 1 or 2 inch deflection spring isolation for applications where sound and vibration issues are of concern.

Motor TypesThe supply fan motor can be upgraded from high efficiency Open Drip Proof (ODP) to high efficiency Total Enclosed Fan Cooled (TEFC) for improved reliability.

LouversFor a cleaner appearance, louvers are available to replace the outdoor air hood. The louvers are constructed of either galvanneal steel or aluminum, and include rain gutters in each blade to channel away rain and reduce entrainment.

Top Inlet Mushroom HoodWhere an end wall outdoor air inlet is not convenient, a top mounted mushroom hood is available. The hood is designed to minimize entrainment and includes a ½ inch expanded metal bird screen.

FM and GAP Style Gas Train For customers who require additional quality and ruggedness, Price MUA units can utilize FM Style (Factory Mutual) and GAP (formerly IRI) style components.

Remote Control PanelFor ease of operation, a remote control panel is available. The panel includes on-off, heat enable and supply air temperature set point control. A service switch is located in the unit control cabinet to improve serviceability by allowing local override during servicing. DDC controls can include a wall mounted room controller upon request.

Additional Options: timeclock, panel-mounted controller, and additional monitoring lights.

Dampers Low leakage aluminum airfoil dampers are available. The improved leakage rate reduces infiltration and heat loss during periods when the unit is shut down. The low leak rating is accomplished by rubber blade and jamb seals and a stiffer blade profile. For even better performance, the blades can be insulated with expanded polyurethane foam, that further reduces heat loss during shut down periods.

FiltersPrice MUA units include a 2 inch filter rack. Metal filters, high temperature filters and replaceable media filters with removable frames are all available for improved indoor air quality, 4 inch MERV 14 secondary filters can be installed for added filtration.

Integral DX CoolingFor applications where cooling is as important as heating, Price offers integral DX cooling. Price offers integrated air cooled DX cooling options from 5 tons up to 130 tons, and integral water cooled DX cooling options up to 65 tons.

Filter GaugesTo improve maintenance, magnehelic, digihelic and photohelic filter gauges are available.

Roof CurbsRoof curbs are an excellent way to install Price MUA units on a roof, particularly for downflow applications. Price curbs are designed to fit perfectly with our units, and include wood nailer strips to tie in the roofing membrane. Price curbs also have internal support rails to hold field supplied flanged duct collars for fast and easy installation. The curbs can be shipped in advance of the units with the duct collars installed prior to unit delivery.

Supply Fan Variable Frequency Drives (VFDs)VFDs can help reduce electrical and gas consumption during periods when the full outdoor air ventilation rate is not required.

Chilled Water CoolingWhere cooling is required and chilled water is available, Price can provide chilled water coils. The coils will be mounted over a drain pan.

DDC ControlsIntegrating HVAC equipment into a building automation system can allow remote control, quick recognition of issues and improved control for performance and savings. Price units can be supplied with BACnet connectivity when used in conjunction with DDC controls.

Performance Data

Single Fan Configuration

Model Number Airflow (cfm) Fan SizeDischarge

Velocity (fpm)

Brake Horsepower (BHP) Temperature RiseESP (inches w.c.) Capacity (MBH)

0.25 0.50 0.75 1.00 1.25 1.50 60 70 80 90 100 110 120AW-D-1-10 1,600 TFC 9 / 7 2,446 1.01 1.1 1.19 1.29 1.39 1.48 114 133 152 170 189 208 227AW-D-1-10 1,800 TFC 9 / 7 2,752 1.24 1.34 1.45 1.55 1.66 1.77 128 149 170 192 213 234 255AW-D-1-10 2,000 TFC 9 / 9 2,381 1.11 1.23 1.34 1.46 1.58 1.71 142 166 189 213 236 260 284AW-D-1-12 2,500 TFC 9 / 9 2,976 1.63 1.76 1.89 2.04 2.18 2.33 177 207 236 266 295 325 354AW-D-1-12 2,700 VFC-11 1,924 1.47 1.65 1.87 2.1 2.34 2.58 192 224 255 287 319 351 383AW-D-1-12 3,000 VFC-11 2,138 1.71 1.89 2.08 2.29 2.53 2.79 213 248 284 319 354 390 425AW-D-1-12 3,500 VFC-11 2,495 2.2 2.4 2.6 2.81 3.02 3.25 248 290 331 372 413 455 496AW-D-1-12 4,000 VFC-11 2,851 2.82 3.04 3.26 3.48 3.71 3.94 284 331 378 425 472 520 567AW-D-1-15 4,500 VFC-12 2,561 2.46 2.71 2.97 3.23 3.51 3.79 319 372 425 478 531 585 638AW-D-1-15 5,000 VFC-12 2,846 2.96 3.21 3.48 3.75 4.04 4.33 354 413 472 531 590 649 708AW-D-1-15 5,500 VFC-14 2,490 2.93 3.24 3.56 3.89 4.24 4.6 390 455 520 585 649 714 779AW-D-1-15 6,000 VFC-14 2,716 3.37 3.69 4.02 4.37 4.72 5.1 425 496 567 638 708 779 850AW-D-1-15 6,500 VFC-16 2,349 3.34 3.72 4.13 4.54 4.97 5.41 461 537 614 691 767 844 921AW-D-1-15 7,000 VFC-16 2,530 3.73 4.12 4.53 4.96 5.41 5.86 496 579 661 744 826 909 992AW-D-1-18 8,000 VFC-18 2,296 3.91 4.32 4.75 5.19 5.66 6.17 567 661 756 850 944 1039 1133AW-D-1-18 9,000 VFC-18 2,582 4.75 5.18 5.63 6.09 6.57 7.06 638 744 850 956 1062 1169 1275AW-D-1-18 10,000 VFC-18 2,869 5.74 6.21 6.68 7.17 7.67 8.18 708 826 944 1062 1180 1298 1416AW-D-1-20 13,000 VFC-20 2,967 7.82 8.42 9.03 9.65 10.29 10.93 921 1074 1228 1381 1534 1688 1841AW-D-1-22 15,000 VFC-22 2,726 8.38 9.1 9.81 10.57 11.33 12.09 1062 1239 1416 1593 1770 1947 2124AW-D-1-22 17,000 VFC-25 2,462 8.74 9.59 10.44 11.35 12.27 13.21 1204 1405 1605 1806 2006 2207 2408AW-D-1-22 18,000 VFC-25 2,606 9.65 10.52 11.41 12.32 13.26 14.22 1275 1487 1700 1912 2124 2337 2549AW-D-1-25 20,000 VFC-25 2,896 11.71 12.64 13.58 14.55 15.54 16.55 1416 1652 1888 2124 2360 2596 2832AW-D-1-25 22,000 VFC-25 3,186 14.1 15.11 16.13 17.15 18.18 19.26 1558 1818 2077 2337 2596 2856 3116AW-D-1-27 25,000 VFC-28 2,880 16.08 17.35 18.67 20.01 21.38 22.81 1770 2065 2360 2655 2950 3245 3540AW-D-1-30 28,000 VFC-32 2,565 15.1 16.47 17.92 19.48 21.14 22.88 1983 2313 2644 2974 3304 3635 3965AW-D-1-30 30,000 VFC-32 2,749 17.09 18.5 20 21.52 23.16 24.85 2124 2478 2832 3186 3540 3894 4248AW-D-1-30 32,000 VFC-32 2,932 19.38 20.82 22.35 23.88 25.51 27.14 2266 2644 3021 3399 3776 4154 4532AW-D-1-33 35,000 VFC-36 2,547 18.71 20.44 22.27 24.26 26.36 28.55 2478 2891 3304 3717 4130 4543 4956AW-D-1-40 40,000 VFC-40 2,315 20.32 22.45 24.78 27.25 29.78 32.35 2832 3304 3776 4248 4720 5192 5664AW-D-1-40 45,000 VFC-40 2,604 24.83 26.99 29.26 31.66 34.24 36.96 3186 3717 4248 4779 5310 5841 6372AW-D-1-40 50,000 VFC-40 2,894 30.27 32.56 34.9 37.33 39.85 42.48 3540 4130 4720 5310 5900 6490 7080

Twin Fan Configuration

Model Number Airflow (cfm) Fan SizeDischarge

Velocity (fpm)

Brake Horsepower (BHP) Temperature RiseESP (inches w.c.) Capacity (MBH)

0.25 0.50 0.75 1.00 1.25 1.50 60 70 80 90 100 110 120AW-D-2-18 17,000 VFC-2-18 2,439 9.26 10.18 11.11 12.08 13.09 14.15 1204 1405 1605 1806 2006 2207 2408AW-D-2-18 18,000 VFC-2-18 2,582 10.2 11.14 12.11 13.1 14.12 15.18 1275 1487 1700 1912 2124 2337 2549AW-D-2-18 20,000 VFC-2-18 2,869 12.34 13.34 14.37 15.42 16.49 17.59 1416 1652 1888 2124 2360 2596 2832AW-D-2-20 22,000 VFC-2-20 2,511 12.39 13.54 14.73 15.95 17.2 18.5 1558 1818 2077 2337 2596 2856 3116AW-D-2-22 25,000 VFC-2-22 2,271 13.22 14.59 16.01 17.49 19.05 20.72 1770 2065 2360 2655 2950 3245 3540AW-D-2-22 28,000 VFC-2-22 2,544 15.95 17.4 18.9 20.44 22.02 23.66 1983 2313 2644 2974 3304 3635 3965AW-D-2-25 30,000 VFC-2-25 2,172 15.42 17.12 18.89 20.77 22.79 24.94 2124 2478 2832 3186 3540 3894 4248AW-D-2-25 32,000 VFC-2-25 2,317 17.04 18.78 20.58 22.46 24.43 26.52 2266 2644 3021 3399 3776 4154 4532AW-D-2-25 35,000 VFC-2-25 2,534 19.76 21.59 23.48 25.41 27.4 29.47 2478 2891 3304 3717 4130 4543 4956AW-D-2-25 40,000 VFC-2-25 2,896 25.18 27.18 29.21 31.28 33.41 35.58 2832 3304 3776 4248 4720 5192 5664AW-D-2-27 45,000 VFC-2-28 2,592 28.49 31.08 33.76 36.55 39.46 42.55 3186 3717 4248 4779 5310 5841 6372AW-D-2-27 50,000 VFC-2-32 2,290 26.93 29.9 33.11 36.48 39.92 43.35 3540 4130 4720 5310 5900 6490 7080AW-D-2-30 52,500 VFC-2-32 2,405 29.09 32.02 35.2 38.6 42.14 45.75 3717 4337 4956 5576 6195 6815 7434AW-D-2-33 55,000 VFC-2-32 2,519 31.46 34.4 37.52 40.9 44.48 48.18 3894 4543 5192 5841 6490 7139 7788AW-D-2-33 60,000 VFC-2-32 2,749 36.79 39.82 42.97 46.26 49.75 53.48 4248 4956 5664 6372 7080 7788 8496AW-D-2-36 65,000 VFC-2-32 2,978 42.9 46.08 49.34 52.69 56.17 59.79 4602 5369 6136 6903 7670 8437 9204AW-D-2-36 70,000 VFC-2-36 2,547 40.2 43.99 47.9 52.18 56.6 * 4956 5782 6608 7434 8260 9086 9912AW-D-2-36 75,000 VFC-2-36 2,728 45.52 49.33 53.3 57.47 61.91 * 5310 6195 7080 7965 8850 9735 10620AW-D-2-36 80,000 VFC-2-36 2,910 51.34 55.48 59.46 63.66 * * 5664 6608 7552 8496 9440 10384 11328AW-D-2-40 85,000 VFC-2-40 2,460 48.28 52.86 57.75 63.03 68.61 * 6018 7021 8024 9027 10030 11033 12036AW-D-2-40 90,000 VFC-2-40 2,604 53.38 58.03 62.9 68.06 73.61 * 6372 7434 8496 9558 10620 11682 12744AW-D-2-40 95,000 VFC-2-40 2,749 58.98 63.75 68.68 73.83 * * 6726 7847 8968 10089 11210 12331 13452AW-D-2-40 100,000 VFC-2-40 2,894 65.07 70 75.04 80.25 * * 7080 8260 9440 10620 11800 12980 14160

*Consult your Price representative for an available selection.

AW-D-8v001

Standard Unit Construction

Price offers many options to customize the unit to fit each application’s requirements. These options may impact performance, dimensions and weight. The following tables describe standard construction options used for the dimensional data within this catalog. For more information about available options or to further customize Price AW-D units, consult your local Price representative.

• 100% Outside air c/w inlet hood and bird-screen

• Constant air volume (CAV)

• Standard Controls

- Unit complete with internal wiring, starters, control transformer, low limit, relays, safeties & actuators

- Standalone temperature controls

• Standard control panel wiring

• Automatic low limit

• Automatic season switch (ambient temperature control)

• 2” MERV 8 filters

• 1” Fiberglass single wall construction (18ga casing, insulation pinned and glued)

• 90°F Temperature rise (range from 60°F - 120°F)

• 7-14 in. w.c. gas pressure

• Gas train weather housing

• Motorized inlet damper with 2 position damper actuator

• Forward curved supply-air fan

• ODP high efficiency motor

• Internal rubber-in-shear fan isolation

• Hinged access doors on filter, fan and controls sections. Removable lift out doors on all other sections

• Horizontal discharge

• Non-fused disconnect

• Discharge air temperature sensor (shipped loose)

• 16” High non-insulated roof curb

• Units larger than 102” in width are split for shipping

• Catalogue drawings indicate Right Hand Configuration

• CSA approved design


Dimensional Data and Accessories

Single Fan Configuration

Model #Dimensions (inches) Gas Inlet Size (NPT) Turn

DownWeight (LBS)A B C D E F F1 G G1 H I J 7-14" wc 1-5 psi

AW-D-1-10 27 13 23 23 8 8 10 67 70 26 32 34 0.75 0.5-0.75 30:1 730AW-D-1-12 32 13 25 25 8 23 25 79 83 28 34 42 0.75-1 0.5-1 30:1 986AW-D-1-15 42 15 34 34 8 23 34 82 86 30 36 52 1-1.25 0.75-1 30:1 1304AW-D-1-18 46 15 42 30 8 24 26 86 91 35 41 52 1-1.25 1 30:1 1596AW-D-1-20 51 17 52 37 8 25 27 92 98 43 49 52 1-1.5 1-1.25 30:1 2107AW-D-1-22 57 17 58 58 8 24 26 94 101 45 51 61 1.25-2 1-1.5 30:1 2495AW-D-1-25 63 17 66 66 8 29 30 105 113 52 58 61 1.5-2.5 1-2 30:1 3069AW-D-1-27 70 17 66 66 8 29 26 115 124 56 62 76 1.5-2.5 1.25-2 30:1 3468AW-D-1-30 78 17 50 50 8 29 26 118 127 62 68 76 2-2.5 1.25-2 30:1 3835AW-D-1-33 87 19 59 59 8 29 31 126 135 69 75 81 2-2.5 1.5-2 30:1 4659AW-D-1-40 101 19 72 72 8 32 34 139 151 90 96 116 2 - NA 1.5-2.5 30:1 5953

FA AIRFLOW

SA AIRFLOW

SA AIRFLOW

SA AIRFLOW

I

G1 - DOWN DISCHARGEG - HORIZONTAL DISCHARGE E

CAPACITY

H

DF - STD

F1 - HIGH C

FLAT BANKFILTER

WITHOUT FILTERS V-BANKINLET HOOD FILTER BURNER SECTION W/ BLOWER & MOTORINLET HOOD

WITH FILTERS

B

A

J

AW-D-10v001

Dimensional Data and Accessories

Twin Fan Configuration

Model #Dimensions (inches) Gas Inlet Size (NPT)

Turn Down

Weight (LBS)A B C D

E (Max Airflow)

F F1 G G1 H I J 7-14" wc 1-5 psi

AW-D-2-18 86 17 42 42 8 (8,000 cfm) 28 26 92 97 36 42 92 1.25- 2 1-1.5 30:1 2758AW-D-2-20 95 17 49 49 8 (13,500 cfm) 28 31 101 107 43 49 100 1.25- 2.5 1-2 30:1 3231AW-D-2-22 107 17 65 65 8 (15,000 cfm) 28 27 105 112 46 52 111 1.5- 2.5 1.25-2 30:1 4026AW-D-2-25 119 19 40 40 8 (22,000 cfm) 28 31 107 115 52 58 120 2-3 1.5-2 30:1 5167AW-D-2-27 133 19 51 51 8 (24,000 cfm) 26 31 112 121 55 61 140 NA 2-2.5 30:1 6039AW-D-2-30 149 19 49 49 8 (32,500 cfm) 31 27 120 129 65 71 140 NA 2-2.5 30:1 6812AW-D-2-33 149 19 59 59 8 (32,500 cfm) 26 31 127 137 73 81 140 NA 2-2.5 30:1 7589AW-D-2-36 167 19 59 59 8 (45,000 cfm) 29 31 127 137 75 83 172 NA 2-3 30:1 8652AW-D-2-40 186 24 70 70 8 (51,000 cfm) 36 36 160 170 84 92 206 NA 2.5-NA 30:1 10957

G - HORIZONTAL DISCHARGEG1 - DOWN DISCHARGE

F - STDF1 - HIGH CAPACITY

D C

H I

E

FA AIRFLOW SA AIRFLOW

SA AIRFLOW

SA AIRFLOW

A

B

J

FILTERV-BANK

BURNER SECTION W/ BLOWER & MOTORSTANDARDINLET HOOD

INLET HOODC/W FILTERS

FILTERFLAT BANK


Clearance Data

Typical Unit Clearances for AW-D Units

OUTSIDE AIRFLOW

FAN & BURNER ACCESS

24" Minimum

INLET HOOD FILTER ACCESS

- 24" Minimum- 36" Recommended

MANIFOLD & ELECTRICAL WEATHER HOUSING

36" Minimum

SUPPLY AIR OPENING

- 8" Minimum- 24" Recommended

AW-D-12v001

Wiring Schematics

Schematic typical for constant volume and discharge air control

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Wiring Schematics


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Wiring Schematics


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Sequence of Operations

System Switch “ON” The fresh air dampers open fully and once the damper end switch makes, the supply fan starts and runs continuously and the exhaust fan interlock is closed (dry contact).

Unit starts and stops when commanded by network signal. Discharge temperature is driven by the network signal. The BMS may command a discharge air temperature setpoint that is variable between 50°F and 90°F.

Economizer OperationThe Economizer is enabled whenever the unit is ON. The unit will operate in purely Economizer Mode when the discharge air temperature deadband is achievable without heating or cooling.

If the discharge temperature deviates away from the discharge air temperature setpoint by more than ±3°F (adjustable) for a period of 2 minutes (adjustable), the unit will enter either Mechanical Cooling or Heating Modes (if equipped).

Heating OperationHeating Mode is enabled when the Economizer cannot maintain a discharge air temperature of at least 3°F (adjustable) below the discharge air temperature setpoint for a period of 2 minutes (adjustable) or if the Heating Call is set to ON.

Once the discharge air temperature PID has been below 1% for a period of 1 minute (adjustable) and/or the heating call is turned off, the unit will transition into Economizer mode if the air entering the burner (outside air) is above 40°F.

Once there is proof of the supply fan, the gas valve opens to the lowest setting and ignites. After ignition, the burner modulates to maintain the discharge air temperature as set by the room temperature reset controls.

Ignition is always started at low fire. Modulation of the burner begins after the gas valve has been open for 10 seconds.

Shutdown is immediate, when run command or contact is opened, or a fault occurs.

System Switch “OFF”The unit is inoperative. The fresh air damper is closed, and exhaust fan interlock opens.

Additional ControlsExhaust InterlockThe proof signal from the external exhaust unit is used to signal the start of the (supply) unit. Loss or failure of this proof will stop the (supply) unit.

It is intended that the external exhaust unit will be started first and the (supply) unit starts as soon as the exhaust unit proves. In the event of an internal fault of the (supply) unit, the unit status contact will open and disable the external exhaust unit.

Reverse Exhaust InterlockThe signal from the external exhaust unit must prove within 3 minutes of the (supply) unit starting up. Upon failure of the exhaust unit proving, loss of proof, or a fault within the (supply) unit, the unit status relay will open and the unit will shut down. A restart or reset of the unit is required to unlatch this faulted state and restart the unit.

It is intended that the external exhaust unit will be started concurrently with the (supply) unit and that the external exhaust unit will be disabled by the opening of the (supply) unit status contact.

Automatic Low LimitIf the discharge air temperature falls below the low limit threshold of 40°F, the unit shuts down. A 7 minute time delay on unit start-up allows for a cold start.

Automatic High LimitIf the discharge air temperature ever goes above the high limit threshold of 150°F, the unit shuts down. A manual reset is required to restart the unit.

Note: the control set-points listed in this document areFactory defaults and may have been changed by othersDuring field installation or start-up.

AW-D-18v001

v001AW-D-19For more information visit www.priceindustries.com

Product Improvement is a continuing endeavour at Price. Therefore, specifications are subject to change without notice.Consult your Price Sales Representative for current specifications or more detailed information. Not all products may be

available in all geographic areas. All goods described in this document are warranted as described in the Limited Warrantyshown at priceindustries.com. The complete Price product catalog can be viewed online at priceindustries.com.

® Price is a registered trademark of Price Industries Limited. © 2016. Printed in Canada 2016. v001

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