1

CTE HEAT - METERS

INSTRUCTION MANUAL

CONTENTS 1. FOREWORD page 4 2. ELECTRONIC MODULE page 4 3. TEMPERATURE SENSORS page 12 4. FLOW SENSOR page 13 5. START-UP PROCEDURE page 14 6. FAILURES AND POSSIBLE SOLUTIONS page 15

2

1. FOREWORD Thanks for the confidence afforded in choosing one of our products. The "system" is mainly consisting of: - one electronic module, giving the indication of the thermal power used (the item is contained in this box); - two temperature sensors, each consisting of 2 probes complete with pockets suitable for pipeline installation (to be ordered separately according to cable length); - one flow sensor consisting of a flow meter (to be ordered separately according to installation features). electronic module temperature probes with pockets flow meter IN ACCORDANCE WITH THE STANDARDS: - EN 1434 - B.T. 72/23/EEC Directive - E.M.C. 89/336/EEC Directive and later updating 93/68/EEC. TYPICAL INSTALLATION ARRANGEMENT: Electronic module Zone 1 – 2 - N Heating forward pipeline Heating return pipeline Sanitary hot water Sanitary cold water Probe + pocket Flow meter Local supervisor 2. ELECTRONIC MODULE It consists of a microprocessor device suitable for measuring flow and return temperatures and thermal carrier fluid flow rate. On the basis of the value of thermal-volumetric coefficient K, the measurements of thermal energy used are also possible and the relevant complete indication will be displayed (additional information about other quantities displayed by the system are herein after described).

3

2.1 Technical data Inputs for the following are provided: - n. 2 temperature sensors - thermal carrier fluid meters with pulse-output - sanitary hot water meters with pulse-output - sanitary cold water meters with pulse-output - external selector for heating/conditioning modes - analogue input 0 ÷ 10V or 0 ÷ 20mA for thermal carrier fluid flow rate (optional) Outputs for the following are provided: - energy pulse-output - thermal carrier fluid volume pulse-output - analogue output (0 ÷ 10 V or 0 ÷ 20 mA) for thermal carrier fluid flow rate (optional) - serial data transmission system RS 485 or M-BUS, depending on request General information: Temperature measurement range 0 ÷ 140 °C ∆t temperature differential 1K ÷ 140 K Temperature coefficient K self-adjusting Accuracy < 2 °C Temperature sensors PT500 Language Italian/English Display backlighted LCD Keyboard n. 1 USER KEY on the front cover Memory NON-VOLATILE STATIC RAM (batteries useful life: 10 years) Power supply 230 Va.c. + 10%, - 15%, 50 Hz Operating temperature 0 ÷ 40 °C Degree of protection IP 54 Installation suitable for wall fixing or DIN mounting rails 2.2 Dimensions 2.3 Assembling and connections 2.3.1 Safety notes Before connecting the electronic module, make sure that the electric power supply is not switched on and that its voltage corresponds to the one mentioned on the appliance (max. 250 V). 2.3.2 Positioning The appliance shall be installed far from heat sources and from devices that may cause electromagnetic interference.

4

2.3.3 Assembling Remark: make sure that the "Litre/pulse" value on the module technical data label corresponds to the one mentioned on the relevant flow meter. a) Open the electronic module; disconnect the internal

connecting wire and separate the base from the front cover (figure 1)

b) Fix the provided fairleads on the relevant holes (figure 2) c) Remove the wall base plate, using a screwdriver and

levering on the spring trigger at the bottom (figure 3) d) Fix this plate directly to the wall using the provided

screw-anchors; make sure that the base plate has been correctly placed and do not forget to insert suitable washers between wall and plate (figure 4)

5

Put the base back on its plate, applying a slight pressure (figure 5): if the assembling is correct you should hear a clear snap. Note: Where applicable, the heat-meter base shall be connected directly on a DIN mounting rail.

e) Insert the connecting wires into the relevant fairleads (figure

6) f) Connect the appliance in compliance with the "TERMINAL

BLOCKS CONNECTION DIAGRAM" g) Screw up the fairleads thus clamping the connecting wires

(figure 7) h) Connect the inner connection wire and fasten the front

cover on the base by means of the provided screws (figure 8)

i) Seal the module inserting lead seals in the provided holes

(figure 9)

6

TERMINAL BLOCKS CONNECTION DIAGRAM 5 Flow temperature PT500 6 Flow temperature PT500 7 Return temperature PT500 8 Return temperature PT500 60 RT+ 61 RT- 24 Meter bus interface 25 Meter bus interface 52 Cold water meter input (signal) 53 Cold water meter input (reference) 54 System mode selector (signal) 55 System mode selector (reference) 56 Flow rate analogue input (signal) 57 Flow rate analogue input (reference) 58 Flow rate analogue output (signal) 59 Flow rate analogue output (reference) 16 Energy pulse-output (signal) 17 Energy pulse-output (reference) 18 Volume pulse-output (signal) 19 Volume pulse-output (reference) 50 Hot water meter input (signal) 51 Hot water meter input (reference) 10 Heating/conditioning meter input (signal) 11 Heating/conditioning meter input (reference) 27 230 Va.c. 28 230 Va.c 2.3.4 WARNING !!! � It is recommended to set up the appliance strictly in compliance with safety and law requirements. � The electric system shall be designed so that the heat-output will be shut up in case of line voltage failure. � The electric power shall be distributed through a loom-shielded conductor and all possible connector blocks

shall be sealed. � In case two heat-meters or more are fitted on a same installation, they shall be connected to the same

power supply line.

7

2.4 Transmission bus The appliance may be connected to a surveillance and control system by means of a BUS RS 485 or M-BUS System. A shielded twisted double-conductor (pair) with approx. maximum length of 1 km shall be used. Perform the wiring connection in compliance with the "TERMINAL BLOCKS CONNECTION DIAGRAM" here in specified. 2.5 Operation When first starting the system, the message "WAIT" will be displayed for 3 sec after the starting procedure (See Part 5 of this manual). Afterwards, the measured thermal energy value will be displayed. The first pressure on the USER KEY switches on the backlightning device. When an alarm is set up, an error code will be displayed and a failure signal will be shown by a flashing backlight. Subsequent pressures on the USER KEY will display the following data:

USER KEY "MAIN INFORMATIONS" MENU - Thermal carrier fluid total meter

- Forward temperature Return temperature

Forward/ return temperatures differential

Hot water total volume meter

Cold water total volume meter

- Access to next menu

! ! WAIT ! ! * * * * * * * * * * * * * *

000621.014 kWh ENERGY heat.

000029.200 m3

VOLUME heat.

100.7 °C

FLOW Temp.

060.3 °C

RETURN temp.

040.4 m3

DELTA Temp.

00004.200 °C VOLUME h. w.

1000.427 m3 VOLUME c. w.

OTHER

INFORMATIONS

8

When the message "OTHER INFORMATIONS" appears on the display, the following data may be obtained, pressing the USER KEY for at least 2 seconds (without interruptions). "OTHER INFORMATIONS" MENU

- Thermal power

- Flow rate - - Air-conditioning/heating thermal energy total meter (inverse function: heating/air-conditioning system mode) - Thermal carrier fluid total volume meter - inverse function: heating/air-conditioning system mode - serial communication node, local/remote system mode - - Heat-meter locking timer in Alarm condition (9999 min.)

- Heating thermal energy partial meter

- Air-conditioning thermal energy partial meter

- Hot water volume partial meter

- Cold water volume partial meter

- - Back to preceding menu

Reserved to authorised personnel only When the message "MAIN INFORMATION" is displayed, it is possible to return to "MAIN INFORMATION" MENU pressing the USER KEY for at least 2 seconds (without interruption). ATTENTION !!! After 1 min. the display will show again the thermal energy value, unless the USER KEY is pressed again.

000053 kW THERMAL POWER.

050.27 m3/h FLOW RATE

002100.030KWh ENERGY cool.

000536.015 m3

VOLUME cool.

COM. NODE L/R 001 L

ALARMS BLOCK. TIMER 0000 min

000030.623 kWk PARTIAL EN. h.

000020.198 kWh PARTIAL EN.C.

000101.036 m3

PARTIAL VOL. c.

000101.036 m3

PARTIAL VOL. h.

MAIN INFORMATIONS…..

PROGRAMMING ! ! RESERVED ! !

9

2.5.1 Remarks on operation procedure Starting form pulses received from the flow sensors, the electronic module measures the thermal power and flow rate values according to the "average on period" method, that is considering the fluid flow rate mean value over an interval between two subsequent pulses (max 200 sec). When displaying the thermal energy measurement, thermal carrier fluid total volume, flow rate/thermal power measurements, the symbol “*” will also be visible for a split second to indicate a pulse coming from the relative flow sensor. When displaying the hot water volume measurements, the symbol "*" will also be visible for a split second to indicate a pulse coming from the relative flow sensor. When displaying the heat and thermal carrier fluid volume measurements, the message "AIR-COND." (COND.) or "HEATING" (RISC.), for air-conditioning and heating modes respectively, will also be visible, next to the measured value and volume unit. Note The system mode is determined:

- either by the external selector position, when connected (See "Terminal blocks connection diagram"): closed contact = air-conditioning; open contact = heating;

- or by a BUS when the system is connected to a surveillance post. When displaying the hot/cold water volume, the message "a.c." or "a.f." (for hot water and cold water respectively) will also be visible, next to the volume unit and the measured value. When displaying partial meter values, the message "PARTIAL" (PARZIALE) will also be visible. Measured values and programming parameters are stored by means of a NON-VOLATILE STATIC RAM Memory with long-life batteries (10 years). In addition to programming parameters, the following operating data will be stored: - Measured heating thermal energy; - Measured air-conditioning thermal energy; - Heating fluid total volume - Air-conditioning fluid total volume - Hot water total volume - Cold water total volume - Heating thermal energy partial meter - Air-conditioning thermal energy partial meter - Hot water partial meter - Cold water partial meter values 2.6 DIAGNOSTICS The following functional checks have been implemented together with the relevant identifying "failure” error codes (See Part 6 - Failures and possible solutions): - Forward probe integrity check - Return probe integrity check - Analogue/digital converter integrity check - Data integrity check in NON-VOLATILE STATIC RAM

∗ 000621.014 kWh ENERGY heat.

∗ 00004.200 °C VOLUME h. w.

10

3. TEMPERATURE SENSORS The temperature sensors send to the electronic module the installation flow/return temperature measurements. Each sensor consists of a PT500 sheathed thermoresistance (1) complete with pocket (2) for pipeline fitting. All sensors are couple-sorted and have an identifying code number.

3.1 Technical data Thermoresistance PT500, 2 wires Reference Standard IEC 751, Class B Relative error between probes < 0,1 K Connecting cable length 2 m/5 m/15 m Pipeline pocket made of AISI 304 stainless steel External diameter 6 mm Pipeline coupling G 1/4" Length 50/100 mm 3.2 Installation 3.2.1 Positioning All temperature probes shall be assembled on: -forward pipeline (3) -return pipeline (4), downstream to flow meter 3.2.2 Assembling a) Weld a G 1/4" sleeve at the pipeline elbow (5) b) Screw up the pocket (2) to the threaded sleeve c) Fill the pocket with silicon grease to assure the thermal conductivity d) insert the sheathed probe (1) in the pocket e) Fix the pocket by means of the drilled screw; do not force f) Connect the pocket to the electronic module by means of the provided cable only g) Lead-seal the pocket and the screw in the provided hole

11

3.2.3 WARNING !!! � The accuracy of the heat-meter depends on the correct installation of temperature sensors � The same fixing procedure shall be followed for both sensors. � Any special part that may be required shall have the same design and shall be made of the same material. � Thermal insulation shall be the same for both sensors. � Do not uncouple the sensors. � The pocket direction shall be opposite to the fluid flow direction. � Sensors shall not be located where air is likely to be trapped in. 4. FLOW SENSOR It sends to the electronic module the thermal carrier fluid volume value. This sensor consists of: - n. 1 flow meter with pulse-transmitter - n. 2 assembling threaded couplings (for DN 13 ÷ 40 only) 4.1 Technical data 4.1.1 Turbine, multi-jet, dry-dial meter types:

DN Nominal flow rate

Qn[(m3/h]

Transitional flow rate Qt [m3/h]

Qmax [m3/h]

Qmin [l/h]

Tmax [°C]

PN [bar]

Head loss at Qn

[bar] 13 1,5 0,12 3,0 30 90 10 0,25 20 2,5 0,2 5,0 50 90 10 0,25 25 3,5 0,28 7,0 70 90 10 0,25 30 6 0,48 12 120 90 10 0,25 40 10 0,8 20 200 90 10 0,25

4.1.2 Turbine, Woltman meter types:

DN Nominal flow rate

Qn[(m3/h]

Transitional flow rate Qt [m3/h]

Qmax [m3/h]

Qmin [l/h]

Tmax [°C]

PN [bar]

Head loss at Qn

[bar] 50 15 2 30 0,7 120 16 0,08 65 25 3,5 50 0,75 120 16 0,05 80 40 6 80 0,8 120 16 0,04

100 60 6 12 1,2 120 16 0,02 120 100 8 200 3,5 120 16 0,02 150 150 12 300 4,5 120 16 0,017 200 250 20 500 25 120 16 0,019 250 400 45 1000 25 120 16 0,020

12

4.2 Installation 4.2.1 Positioning The flow meter shall be installed on return pipelines (4). 4.2.2 Assembling The "arrow" indicator marked on the flow meter body shall be set in the thermal carrier fluid flow direction. Turbine multi-jet meters shall be fitted in the horizontal position. Turbine Woltman meter may be fitted in vertical or horizontal position. The upstream straight pipeline shall have a length at least 10 times greater than the pipe diameter. The downstream straight pipeline shall have a length at least 5 times greater than the pipe diameter. After the completion of the installation procedure, lead-seal the couplings on pipeline. 4.3.2 WARNING !!! � Flow meter shall be inspected easily for maintenance purposes. � Two dampers shall be added in order to permit the maintenance operations. � The assembly of an upstream filter is also recommended. 5. STARTING PROCEDURE Before starting the system, the following conditions shall be fulfilled and verified: - the whole system has been completely washed out (in particular when the appliance has been fitted on a

pre-existing system); - flow meter has been correctly assembled on the return pipeline; - the "arrow" indicator marked on the flow meter body has been set in the flow direction; - the flow meter dampers are open; - the upstream filter is clean; - the temperature sensors have been correctly assembled; - the line voltage corresponds to the electronic module power supply voltage; - the module electrical connections are performed as stated in the Terminal Blocks connection diagram"; - the "litre/pulse" value marked on the module technical data label corresponds to the relevant value of the

flow meter (this is a pre-set value that cannot be changed). Afterwards, switch on the electronic module and compare displayed with actual quantities.

13

6. FAILURES AND POSSIBLE SOLUTIONS MISFUNCTION POSSIBLE CAUSE SOLUTION NON-VOLATILE STATIC RAM Alarm !!ERROR!! - Cod. 001 -

Memory data no more valid Call Technical Service

Analogue/digital converter alarm !!ERROR!! - Cod. 002 -

Failure of analogue/digital conversion section

Call Technical Service

Flow temperature probe alarm !!ERROR!! Cod. 003

Failure of forward temperature probe

Check connections (wire harness) probe/electronic module terminal blocks and/or probe integrity. Replace the sensor pair (forward and return)

Return temperature probe alarm !!ERROR!! - Cod. 004

Failure of return temperature probe

Check connections (wire harness) probe/electronic module terminal blocks and/or probe integrity. Replace the sensor pair (forward and return)

∆t temperature difference alarm ! !ERROR!! Cod. 005

Thermal head not corresponding to system mode Thermal head lower than the admissible values

Check the system mode programming (air-conditioning/heating). Check temperature sensors/electronic module connections and positioning of temperature sensors. Check that the system is operating

The appliance does not switch on (display off)

Lack of electric power supplies (230 Va.c.)

Check the power supply (230 Va.c.) to electronic module terminal blocks n. 27 and 28

A series of "hyphens" appears on the display ------.--- °C FORWARD TEMP.

Non-reliable data Check the relevant error code

A series of "hyphens" appears on the display instead of flow rate and thermal power values ----- .------kW THERMAL POWER

Non-reliable data: the thermal carrier fluid flow rate is too low (POTENZA TERMICA)]

Check that the system is operating

Heat metering not correct 000100,010 kWh ENERGY heat

The electronic module has not been correctly programmed in respect to the relevant flow meter (ENERGIA risc.)]

Check that the "litre/pulse" value is the same for electronic module and flow meter (See technical data Labels on appliances)

The value "<0 °C" or ">140 °C" appears on the display >140 °C FORWARD TEMP.

The temperature value exceeds the operating limits (TEMP. DI MANDATA)]

Check the temperature probes integrity Check the system actual temperature

14

PASSWORD PRG < 0 0 0 >

PASSWORD PRG < 0 0 0 >

RCN NODEC L/R < N > < 001 > < L >

TO AUTHORISED PERSONNEL ONLY ATTENTION!!! This sheet is reserved to the authorised personnel (Premises Administrator and/or heating system's maintenance engineer). It is therefore recommended to cut out and retain this sheet so that it will not be at the disposal of final users. When the message " !!PROGRAMMING!! RESERVED!! " (last parameter of "OTHER INFORMATION" Menu) appears on the display, a request for a PASSWORD is displayed upon a continuous pressure on the USER KEY of at least 5 seconds, thus allowing the access to the parameters programmable by authorised personnel. [PASSWORD PRG <000>] (the first digit "0" is flashing) In this case, a subsequent pressure on the USER KEY allows to enter the numerical values of each digit (0 to 9) while a few seconds wait (without any pressure on this key) allows the access to the next digit. WARNING!!! � If a wrong PASSWORD has been entered, the appliance returns

to "OTHER INFORMATION" Menu. � The access to the programmable parameters is allowed entering

the correct PASSWORD "916" [PASSWORD PRG - <916>]. � When the password has been correctly entered, the parameters

RCN, NODEC; L/R will be displayed [RCN – NODEC – L/R <N> <001> <L>] (the letter “N” is flashing).

� These parameters’ programming method is similar to the one described for the password entering: pressing the USER KEY allows to modify or enter the possible values of each parameter; a few seconds wait (without any pressure on this key) allows the access to the next parameter or digit.

DESCRIPTION OF PARAMETERS RCN It refers to partial meters reset function. Two values are possible: N = no reset; Y = reset NODEC It is the serial communication node number. Values starting from 001 to 255 are possible. L/R It refers to "local" or "remote" control of the system mode (air-conditioning/heating). Two values are allowed: L = local; R = remote. When under "L" condition, the choice can be made only by the external selector input provided for heating/conditioning selection. When under "R" condition, the choice can be made by a supervisor only (the selector positions "heating" or "conditioning" have no influence).