HEAT RECOVERY UNITS WITH COOLING CIRCUIT Aermec URHE
Contents
1. sinou dung sinoy Jo sinoy z 1ossaidwog sinoy Jo LHO Sunoy Josseudwio9 8njeA pJOMSSed Op 14 siajaweseg 150190 101 014 SJ9jeUJeJe d 299 siajaweleg dung 104 Xepuj LOW xepu Jaweed wely X pu JOJOWEIE UV sisjeweleg ue 90 1ossaidwog 109 1 300 siajawereg uowesnByu09 LOH Xepuj Sniejs ndul jey6iq 010 Indu 003 suueje jue no enjeA Iduj tOr 101 8p09 indu anjen Buea 195 195 9027 anjen jeg 009 2 195 9021 _ 2 JHO Sino Bugeiedo SSg POMSSeq JW py sindu dL sindu enBojeuy 145 1000195 wey Juang aqold 0007 Controls manual AERMEC SS air conditioning Compressor The compressor is controlled by the relays of the control panel on board of the unit Compressors are turned on and off according to the temperatures detected and the tempe rature control functions that have been set Compressor configuration The compressor must be connected to output NOT Compressor timing Compressor sta2. RELAYS 2 2 A 250V NO1 NO2 NO5 NO4 SSIES md 6 5 2 1 413 Layout view rear of the control panel on board the unit User interface Displays The device shows all the informations and the alarms by means of a display and led signals present on the front panel AERMEC SS air conditioning Buttons Selects the operating mode If the Heating mode is enabled each time the button is pressed the following sequence occurs stand by gt cooling gt heating gt stand by If the Heating mode is not enabled stand by gt cooling gt stand by SET Resets alarms and modifies the set point Press once to reset all inactive alarms that can be reset manually If you hold the button down for 2 seconds the unit displays the set point of the set mode 773 If you press both buttons at the same time and then release them within 2 seconds you go down one level in the display menu If you press both buttons for more than 2 seconds you move one level up If the last level of a menu is displayed press the button and release it within two seconds to go up one level In men operating mode it shows the pre vious label or increases the shown value depending on the context In men operating mode it show
3. keep the power supply cables diveded from the control cables to prevent from interferences Analogue inputs There are 4 analogue inputs 3 NTC temperature probes 1 input which may be configured for an NTC probe or 4 20mA signal The inputs are idetified from here on as Al1 Al4 Digital inputs There are 5 voltage free digital inputs identified from here on as ID1 ID15 12 and Al4 may also be added to these if they are configured as digi tal inputs with parameters Pa 05 6 Pa H08 8 digital inputs are therefore available Wiring of remote panel Important Never connect the keyboard when the instrument is on Avoid short circuiting on the cables when the instru ment is on this may damage the instru ment User interface The user interface allows for the control of all the unit operations operating setting mode components checks and controls alarms management Controls manual Heat recovery unit with cooling circuit URHE_CF 0612 6180758 rev 01 Wiring of remote panel TERMINALE REMOTE TERMINAL 24 25 26 n 3 shielded cables not included max length 150 m min section 0 5 MORSETTIERA QUADRO ELETTRICO A a ELECTRIC TERMINAL BOARD 24 blue 25 red 26 black GND TC ips SERIAL
4. 1 Dynamic set point enabled Pa H32 Dynamic set point offset in cooling mode The maximum value that may be added to the set point in cooling mode Pa H33 Dynamic set point offset in heating mode The maximum value that may be added to the set point in heating mode Pa H34 Outdoor temperature dynamic set point in cooling mode The temperature above which the set point offset is zero in cooling mode Pa H35 Outdoor temperature dynamic set point in heating mode The temperature above which the set point offset is zero in heating mode Pa H36 Outdoor temperature dynamic set point differential in cooling mode Used to set the for outdoor temperature differential below which the maximum set point offset applies Pa H37 Outdoor temperature dynamic set point differential in heating mode Used to set the for outdoor temperature differential above which the maximum set point offset applies Pa H38 Reversing valve polarity relay ON in cooling mode relay ON in heating mode Pa H39 Offset AI1 Pa H40 Offset 12 H41 Offset AI3 This parameter can be used to compensate for the error that may occur between the tempera ture or pressure reading and the actual value Pa H42 Offset Al4 These parameters can be used to compensate for the error that may occur between the tem perature reading and the actual temperature Pa H43 Mains frequency 0 Mains frequency 50 Hz 1 Mains frequency 60 Hz AERMEC
5. 35040 Bevilacqua Vr Italy Via Roma 996 Tel 39 0442 633111 Fax 39 0442 93730 39 0442 93566 AERMEC COMPANY QUALITY SYSTEM Uy carta reciclata aK recycled paper ICIM 180 9001 2000 n 0128 5 7 papier recycl m A 9 recycled papier c AERMEC SPA Technical data shown in this booklet are not binding AERMEC S p A shall have the right to introduce at any time whatever modifications deemed necessary to the improvement of the product
6. air conditioning Pa H44 Family serial address Pa H45 Device serial address Used to select the serial address Both nor mally set to 0 Pa H46 User password Can be used to enter the password required to access second level parameters Pa H47 Copy card write password The password that must be entered to copy parameters to the copy card Pa H48 Number of compressors per circuit 1 1 Compressor 2 2 Compressors or 2 steps Pa H49 Enable pressure temperature based operating e O parameters H07z0 probe AI3 absent Pa F01 3 operation in response to request from compressor are forced e temperature based operating parame ters HO7 Pa F01 are forced to Pa H07 AI3 temperature probe Pa F01 3 opera ting in response to request from compressor 2 pressure based operating parameters Pa H07 Pa F01 are forced to Pa H07 2 AI3 probe operation based on pressure 01 0 proportional operating 3 no constraints are set on parameters Pa H50 Compressor start up sequence O compressors start according to operating hours balancing of operating hours 1 compressor 1 is started first and then com pressor or capacity step 2 fixed sequence Pa H51 Compressor 2 or capacity step polarity 0 relay ON if compressor 2 capacity step ON e 1 relay ON if compressor 2 capacity step OFF Pa H52 Selection of degrees C or F 0 degrees C 1 degrees F Pa H53 Display of air air machine
7. the condensing pressure raises up to the defrost stop pressure the defrosting process doesn t stop in 5 min max defrosting time Counter mode The defrost time counter is interrupted when temperature pressure rises above Pa 0612 6180758 rev 01 402 defrost start temperature pressure the compressor is turned off The counter is reset following one of these events defrost cycle performed power failu re change in operating mode The counter is also reset when the tempe rature pressure rises above Pa d04 defrost end temperature pressure Power failure If there is a power failure when the power is restored the control returns to the state prior to the power failure If defrosting is in pro gress the procedure is cancelled All timing in progress is cancelled and restarted COMPR RV fig 01 COMPR compressor RV reversing valve SD start of defrosting ON COMPR OFF ON RV OFF COMPR compressor RV reversing valve FD end of defrosting FD fig 02 11 AERMEC SS air conditioning The control device can perform a comple te check of the unit giving a list of possible alarms Alarms can be activated and reset using parameters Pa A01 Pa A26 Some alarms can be de activated for a preset interval of time that is determined by the relative parameter The unit is also able to count the number of events fo
8. 2420 Automatically reset unless alarm events per hour reaches the value of parameter Pa 08 after which it is manually reset Not active when Pa A07 time is counted after a compressor is turned on Reset is carried out automatically if the number of events per hour is equal to parameter A09 othe rwise it becomes manual Reset is carried out automatically if the number of events per hour is equal to parameter A09 othe rwise it switches to manual In Heating mode it is not active while the Pa A10 time is counted from start up of the unit with ON OFF button see keyboard or with ON OFF digital input see digital inputs 13 AERM MEC Heat recovery unit with cooling circuit URHE CF M nen 0612 6180758 rev 01 ELECTRIC CODE SIGNAL DESCRIPTION COMPR HEATERS Triggered if probe AI3 confi gured as an analogue input Probe AI3 faulty shorts or is cut off or probe limits are exceed 50 C 100 C FAN OFF Triggered if probe AI3 confi gured as an analogue input Probe AI3 faulty shorts or is cut off or probe OFF OFF limits are exceed 50 C 100 C OFF OFF Triggered if the digital input configured as worn filters see digital inputs remains active for a period of time equal to Pa A04 Goes off if the digital input Worn filters configured as worn filters OFF OFF see digital inputs remains inactive for a period of time equal to 05 Not active when the
9. activated Pa r08 Anti freeze electric heater set point in Cooling mode It represents the temperature in Heating mode below which anti freeze electric hea ters are activated Pa r09 Maximum set point limit for anti freeze electric heaters Sets the maximum set point for anti freeze electric heaters AERMEC IER air conditioning Pa r10 Minimum set point limit for anti freeze electric heaters Sets the minimum set point for anti freeze electric heaters Pa r11 Anti freeze electric heater hysteresis Pa r12 Enable heat pump shut down 0 heat pump always on heat pump shut down when outdoor temperature is too cold Pa r13 Outdoor temperature set point for deactivation of heat pump The temperature below which the heat pump is turned of Pa r14 Differential for deactivation of heat pump The differential for deactivation of the heat pump If the outdoor temperature exceeds Pa r144Pa r13 the heat pump is turned back on Pa r15 Enable integrated electric heater control If this parameter 1 the electrical heaters also act as integrated heaters If not Pa r15 0 the electrical heaters only perform the anti freeze function Defrost parameters Pa d01 Defrost enabled 0 defrost function disabled 1 defrost function enabled Parameters table The following table shows all the control para meters Heat recovery unit with cooling circuit URHE_CF Pa d02 Defrost start temperature pressure The t
10. compressor ON activation on compressor activation com pressor ON the two digital outputs com pressor and evaporator internal fan are always active in parallel without any delay Pa H23 Configuration of output relay NO3 0 Reversal 1 Not used 2 second compressor step Pa H24 Configuration of output relay NO4 e 0 Anti freeze electric heaters 1 Not used 2 Boiler Pa H25 Configuration of analogue output 0 Not used 1 4 20 mA fan speed output fan e 2 0 10 V fan speed output fan e 3 4 20 mA fan speed output damper 4 0 10 V fan speed output damper Pa H26 Configuration of serial protocol not used 0 Invensys 1 Modbus Pa H27 Selection of operating mode Selects which input determines Heating Cooling operating mode e 0 Selection from keyboard 16 e 1 Selection from digital input 2 Selection from analogue input Al4 3 Selection from analogue input Pa H28 Presence of heat pump 0 Heat pump absent 1 Heat pump present Pa H29 Heating mode set point If mode selection from the analogue input is enabled this is the value of Al4 below which the control will switch to heating mode Pa H30 Mode selection differential If mode selection from the analogue input is enabled this is the temperature differential for switching to cooling mode Pa H31 Enable dynamic set point Enables the function 0 Dynamic set point disabled
11. digital Imputs Terminal and connec tions 1 9 way snap on higt voltage connector AWG 16 28 1 16 way snap on AWG 16 28 igt voltage connector pitch 4 2 1 p2 5 5 way connector with remote control and copy card programming AWG 24 30 1 2 3 way connector remote keyboard AWG 22 30 Display and LEDs n 3 digits sign n red LEDs Bottons 2 I2botons 0000000 Serials 1 serial 9600 1 serial 2400 Front panel 76x34 depth 58 mm PC ABS plastic resin with VO rated fire protection Installation 0 1 mm EU Directive 89 336 EEC and subsequent amendments and is compliant with the fol lowing harmonized standards 23 Panel EN with drilling template 71x29 mm 0 2 LOW VOLTAGE EN60730 EMISSIONS EN50081 1 EN55022 IMMUNITY EN50082 2 IEC 1000 4 2 3 4 5 AERMEC SS air conditioning To ensure safety the controller must be installed and operated in accordance with the instructions supplied and access to high voltage components must be preven ted under regular operating conditions The device shall be properly protected against water and dust and shall be accessible by using a tool only The device is suitable for incorporation in a household appliance and or similar air conditioning device AERMEC SpA shall not be liable for any damages deriving from installation use other than that prescri bed which does not comply with the safety standards specified in the regulation
12. point input Pa H08 Configuration of Al4 e 0 No probe 1 Condensation control NTC input 2 Multi functional digital input 3 External temperature NTC input Pa H09 Pressure bottom scale value Maximum input value sets the value that corresponds to a current of 20 mA Pa H10 Polarity of digital input ID1 Controls manual Heat recovery unit with cooling circuit URHE CF Parameters 0612 6180758 rev 01 Pa H11 Polarity of digital input ID2 Pa H12 Polarity of digital input ID3 Pa H13 Polarity of digital input ID4 Pa H14 Polarity of digital input ID5 Pa H15 Polarity of analogue input AI1 e 0 Active with closed contact 1 Active with open contact Pa H16 Polarity of analogue input AI2 Pa H17 Polarity of analogue input Al4 If configured as digital inputs 0 Active with closed contact 1 Active with open contact Pa H18 Configuration of digital input ID3 Pa H19 Configuration of digital input ID4 Pa H20 Configuration of digital input ID5 Pa H21 Configuration of AI4 if configured as digital input Pa 08 2 e 0 Compressor thermal switch 1 Fan thermal switch 2 Worn filters 3 Remote Heating Cooling 4 Remote ON OFF 5 Thermal switch compressor 2 6 Request for second compressor capacity step 7 damper opening Pa H22 Configuration of output NO2 e 0 Evaporator fan 1 Evaporator fan HOT START activation on compressor regulation demand and not on compressor activation
13. probe failure cooling circuit high and low pressures compressor thermal protection fan thermal protection Installation of remote panel rri SSS aS a ee To access the keyboard on the remote panel remove the front panel with a screwdriver or similar tool as shown in fig 01 The cables must pass through the central hole in the rear section fig 01 The keyboard is designed to be wall drill four 4 mm diameter holes in the wall at the specified distance Fix the black rear part to the wall with four screws After carrying out the necessary tions close the front section of the key board by simply pushing it in place dure mounted After removing the front part central hole for cables fig 02 fig 01 ss ue Wo Er 0 5 e 2 js 12 10 99 50 12 10 1 T Ll gt 80 00 La Controls manual gt 124 00 25 00 AERM EC air conditioning During the connection procedure between the electrical panel and the remote control respect the following rules do not apply to the analogue and digi tal ouputs powers higher than the ones declared in this manual make the connections respecting the wiring diagrams in this manual
14. the local CHAMBER OF COMMERCE if this is not so AERMEC S p A declines all responsibility regarding the safety of the product THE MANUFACTURER DECLINES ALL LIABILITY FOR DAMAGE TO THINGS OR INJURY TO PERSONS AND ANIMALS CAUSED BY THE FAILURE TO OBSERVE THE INSTRUCTIONS AND STANDARDS IN THIS MANUAL Although suitable risk analysis have been performed during the design of the URHE_CF unit PAY ATTENTION to the pictograms on the machine which help understand the manual better rapidly catching the attention of the reader concerning the risks which can not be avoided or sufficiently limited through the use of technical protection means and measures GENERAL HAZARD SIGNAL Carefully adhere to all the indications Controls manual Heat recovery unit with cooling circuit URHE_CF 0612 6180758 rev 01 Introduction next to the icon Failure to comply with the instructions may generate hazardous situations with possible damage to the health of the operator and user in general DANGEROUS ELECTRICAL VOLTAGE SIGNAL Carefully adhere to all the indications A next to the icon The signal indicates components of the unit or in this manual specifies actions that could generate electrically related risks GENERAL PROHIBITION SIGNAL Carefully adhere to all the indications next to the icon that limit actions in order to guarantee better Q operator safety MAIN WARRANTY CONDITIONS The warranty does not cover pa
15. write password Number of compressors per circuit Enables pressure temperature based operating Compressor start up sequence Compressor 2 or capacity step polarity Selection of degrees C or F Display of air air machine SET POINT Customer code 1 Customer code 2 Polarity of alarm relay Enables alarm relay in off position Enables changeover from keyboard in hysteresis of analogue changeover COMPRESSOR PARAMETERS TABLE Description Value Limits Unit Values ON OFF safety time 18 ON ON safety time 20 Temperature control hysteresis in cooling mode 2 0 1 Pa C02 Pa Pa C04 Pa C05 Pa C06 Pa C07 Temperature control hysteresis in heating mode 1 5 Regulation step intervention differential 2 Interval between compressor 1 compressor 2 start up 0 255 Seconds 20 Interval between compressor 1 compressor 2 shut down 02255 _ Seconds 5 Controls manual 20 AERM MEC Heat recovery unit with cooling circuit URHE CF ALARM PARAMETERS TABLE LN Values rae Low pressure switch bypass time from compressor o os255 seconds 20 Pa A03 Bypass time for worn ites activated by an o 0259 seconds Pa A05_ Duration of inactive worn filters input 02255 Seconds fis Pa a06 Number of worn fiter everts perho fs Pa A07 Compressor thermal switch bypass time activated by compressor 0 03255 5 ra A08 Number
16. 28 Freecooling offset in heating mode Moves the freeheating set point in relation to the heating set point Pa F29 Freeheating band in Heating mode Freeheating control band Pa F30 Outdoor internal temperature offset in freecooling and freeheating Offset in controller that compares outdoor and internal temperature Pa F31 Minimum damper opening Minimum damper opening value Pa F32 Freecooling shut down set point Outdoor temperature that shuts down freecooling Pa F33 Freecooling shut down offset Controller offset that shuts down freecooling Evaporator fan parameters Pa P01 Evaporator fan operating mode May be used to determine the pump or fan operating mode e 0 continuous operation e 1 fan shuts down as the same time as the compressor 2 continuous operating of fan in coo ling mode on request in heating mode 3 continuous operating of fan in coo ling mode on request in heating mode 4 continuous operating of fan in heating mode on request in cooling mode Pa P02 Delay between fan ON and com pressor ON It sets a delay between the start up of the fan and the compressor It is expressed in seconds 18 0612 6180758 rev 01 Pa P03 Delay between compressor OFF and fan OFF It sets a delay between the shutdown of the unit and the fan It is expressed in seconds Anti freeze boiler parameters Pa r01 Configuration of electric heaters in Defrost mode Determines electric heater operation when the def
17. AERMEC _ HEAT RECOVERY UNITS WITH COOLING CIRCUIT CONTROLS MANUAL URHE CF wj AERMEC S P A 6180758 01 Index Introduction Main characteristics Installation of remote panel Wiring of remote panel User interface Ment levels Components Functions Diagnostics Parameters setting Parameters Technical characteristics Use of the control device Responsabilities and residual risk AERMEC SS air conditioning The control installed on the URHE_CF units is a compact device usually provided to control air conditioning units Carefully and thoroughly read all the information referred to in this manual Pay particular attention to the norms accompanied by the indication DANGER or ATTENTION since if not observed may cause damage to the unit or to people e f any malfunctions are found out which are not included in this manual please contact the local After Sales Service immediately e AERMEC S p A declines all liability for any damage caused by the improper use of the machine or the partial or superficial reading of the information contained in this manual e Installation and maintenance must be performed by qualified and experienced personnel having the requirements that are foreseen by law 46 90 and or the DL 380 2001 for the electrical electronic and air conditioning installation with consequent registration at
18. C temperature probe on the exhaust air flow NTC temperature probe for the fresh air flow differential pressure switch for the fresh air filter When the free cooling accessory is required the dampers and the actuators are provided for A remote control panel is also inclu The connecting terminal of the remote control and the connecting terminal on the electrical panel has to be connected by means of shielded electrical cables with min 0 5 mm2 section and max 150m lenght cables non included Please refer to the paragraph Wiring of remote panel for the connecting proce Heat recovery unit with cooling circuit URHE CF 0612 6180758 rev 01 Main characteristics u 91 ded for the remote management of the unit max distance 150m wiring cable not included The main functions of the control panel are room temperature control based on the temperature of the exhaust air management of the de frosting proces ses remote ON OFF Summer Winter switch electric heating coil control if required water heating coil control if required User interface with two different levels of accessibility with password inside the electrical panel remote panel max distance 150m to be connected directly to the unit wiring cable not included Troubleshooting The controls check and mark the fol lowing possible failures temperature
19. Defrost temperature pressure com pensation delta Refer to temperature compensation at start of defrosting TP t03 Cooling circuit high pressure To express the pressure value in bar divide the read valued by 100 TP t04 External temperature External temperature display Description Pa H02 Pa H03 Pa H04 Pa H05 Pa H06 Pa H07 Pa H08 Pa H09 Minimum set point during heating Minimum set point during cooling Configuration of AI2 NO PROBE Pressure bottom scale value Polarity ID1 HP Active if open Pa H11 Polarity ID2 LP Active if open Pa H12 Pa H13 Close SUMMER Polarity Polarity Al2 15 rms cogni es Pamo _ Configuation ID Remote ONO oo es continue Controls manual Maximum set point during heating Maximum set point during cooling Configuration of EXHAUST AIR PROBE Configuration of AI3 PRESSURE PROBE Configuration of Al4 EXTERNAL PROBE Polarity ID3 Fan TH Active if open Polarity ID4 Remote OFF Active if open Polarity 105 Summer Winter if H27 1 Open WINTER 1 Value 160 200 0 19 Limits 250 H02 90 0 40 0 Pa H01 240 Pa H04 90 0 40 0 Pa H03 C 3 ojo o 554 r LE l Unit AERMEC Values C C C N Ww 8 kPa 10 Flag Flag Flag Flag Flag Flag Fl
20. Freecooing shut down setpoint de _ 127 127 100 40 20 10 N rm m m 5 6 N DEFROST PARAMETERS TABLE hg _ 1 ag Pa 11 Defrost temperature pressure compensation offset 170 255 253 _ crioatart0 20 5 30 30 15 2 3 409 Temperature at which defrost ends if Pa H49 1 150 500 80 0 C 10 Controls manual 22 AERMEC air conditioning General Technical Data The unit must be powered by an adequate transformer with the following characteri stics Primary voltage 110V 10 Secondary voltage 12V Supply frequency 50Hz 60Hz Power 5VA 230V 10 Electromechanical and I O characteristics Dimensions and installation Standards The product complies with the following European Union Directives EU Directive 73 23 EEC and subsequent amendments Controls manual Heat recovery unit with cooling circuit URHE_CF 0612 6180758 rev 01 Technical characteristics Power Supply frequency 50Hz 60Hz aS Ea Bu Operating ambient humidity 30 10 90 non condensing Storage ambient humidity 30 10 90 non condensing 120 240V digital outputs 5 rele 2A 1 2 hp 240V 1 8 hp 120V Analogic inputs 3 temperatur sensor measuring range 30 C 90 1 configurable Input 4 20mA trasducer or tempera tur sensor range 30 C 90 C Digital imputs 5 voltage free
21. Pa time is counted after fan is turned on Triggered if probe AI3 confi gured as an analogue input Probe AI3 faulty shorts or is cut off or probe limits are exceed 50 C Reset is carried out automatically if the number of events per hour is equal to parameter A06 othe rwise it switches to manual 100 C e is configured as a hea ting request digital input and Configuration Al2 as a cooling request see analogue inputs the alarm will be triggered when both inputs are active Triggered if probe see analogue inputs reaches Over temperature values higher than Pa A25 for OFF a period of time exceeding Pa A26 3 Only with manual reset Only if Pa A17 1 OFF OFF OFF FF Controls manual 14 AERMEC IE air conditioning Default configuration It is an air air conditioning unit with a sum mer winter change over on the inlet probe e The All probe is on the air inlet it controls the temperature and the summer winter change over The AI2 probe is on the evaporator and is used to determine the anti freeze tempera ture The AI3 probe is on the condenser and is used to control condensation and defrosting The Al4 probe is on the air inlet and is used for freecooling The ID1 input is the high pressure digital input it is configured as active when the con tact is open The ID2 input is the low pressure digital input it i
22. SET POINT For a simpler user interface in air air ver sions by setting parameter Pa H53 1 the set point for the mode selected is displayed normally Pa H54 Customer code 1 This is a number ranging from 0 to 999 that the user can assign for internal use Pa H55 Customer code 2 This is a number ranging from 0 to 999 that the user can assign for internal use Pa H56 Polarity of alarm relay 0 output is active contact closed when there is an alarm 1 the contact is open with the same conditions Pa H58 Enables change over from keyboard in hysteresis of analogue change over 0 change over is not possible in hyste resis Controls manual Heat recovery unit with cooling circuit URHE CF 1 change over is possible in hysteresis Alarm parameters Pa A01 Low pressure pressure switch by pass time Determines the delay between starting up the compressor and starting up the low pressure digi tal alarm diagnostics It is expressed in seconds Pa A02 Number of low pressure events per hour Used to set the number of low pressure digital alarm events per hour If exceeded the system will switch from automatic reset to manual reset Pa A03 Bypass time for worn filters activated by evaporator fan Used to set a delay in triggering off the worn filter digital alarm activated by the evaporator fan It is expressed in seconds Pa A04 Duration of active worn filters input Used to set a period of time during which the wor
23. ag Flag o ____ AERM MEC Heat recovery unit with cooling circuit URHE CF M onn 0612 6180758 rev 01 Pu Description usi REE Vad Pa H21 Configuration Al4 NOT USED if digital input oz 2 Configuration relay 3 Reversing Valve foz2 o um H24 Configuration relay 4 Integration N Pa H25 Pa H26 Pa H27 Pa H28 Pa H29 Pa H30 Pa H31 Pa H32 Pa H33 Pa H34 Pa H35 Pa H36 Pa H37 Pa H38 Pa H39 Pa H40 Configuration analogue output Freecooling eua ls r ro 2 3 Configuration of serial protocol Selection of operating mode H27 1 remote SUMMER WINTER Presence of heat pump N ulu i ps ojo N Heating mode set point Mode selection differential Enables dynamic set point Dynamic set point off set in cooling mode Dynamic set point off set in heating mode j Outdoor temperature dynamic set point in cooling mode 190 4 Outdoor temperature dynamic set point in heating mode Outdoor temperature dynamic set point differential in cooling mode 200 j Outdoor temperature dynamic set point differential in heating mode j Reversing valve polarity Offset 0 0 Mains frequency Family serial address Devide serial address Num User password Pa H42 Pa H43 Pa H44 Pa H45 Pa H46 Pa H47 Pa H48 Pa H49 Pa H50 H51 Pa H52 Pa H53 Pa H54 H55 Pa H56 Pa H57 Pa H58 Copy card
24. cold air Heating this is the winter operating mode in this mode the unit is configu red to generate hot air Stand by in this mode the machine does not perform temperature control functions and all the alarms remain acti ve Setting set points Activation or de activation of the loads varies dynamically according to the tempe rature control functions set the temperature pressure values measured by the probes and the set points Two set points are defined Cooling set point this is the reference set point when the unit is in Cooling mode Heating set point this is the reference set point when the device is in Heating mode Set points can be changed from the keyboard by accessingsubmenu SET seemenu layout or by pressing the set button for 2 seconds Set points can be assigned values that fall within a range determined by parameters Pa 02 Heating and Pa H04 Cooling ON OFF from digital input Digital inputs 103 ID4 105 and Al4 analogue inputs can be configured to give an ON OFF command If this type of input is activated the instrument will turn off all loads and E00 appears on the display Electricheating coil MBXxx or water heating coil MBCxx accessories fig 1 In heating mode the electric heaters or the coils are activated when AI1 SET Heating Controls manual Heat recovery unit with cooling circuit URHE CF Functions 0612 6180758 r
25. ditioning Parameters can be set so that the ERT 200 is fully configurable Parameters can be changed with keyboard Copy Card PC if the special connection and Param manager software are available DESCRIPTION OF PARAMETER Configuration parameters These parameters define the characteristics of the machine If one or more parameters in this category is changed the controller must be turned off and on again in order to operate correctly Pa G01 Cooling set point Sets the set point in Cooling mode Pa G02 Heating set point Sets the set point in Heating mode Pa H01 Maximum heating set point Sets the maximum set point in heating mode Pa H02 Minimum Heating set point Sets the minimum set point in Heating mode Pa H03 Maximum Cooling set point Sets the maximum set point in Cooling mode Pa H04 Minimum cooling set point Sets the minimum set point in Cooling mode Pa H05 Configuration of Configures analogue input e 0 No probe 1 Inlet air analogue input 2 Heat request digital input 3 Temperature control request digital input 4 Not used 5 On remote keyboard Pa H06 Configuration of A12 0 No probe 1 Analogue input 2 Cooling request digital input 3 Anti freeze alarm digital input Pa H07 Configuration of A13 e 0 No probe 1 Condensation control analogue input e 2 4 20 mA condensation input e 3 4 20 mA dynamic set
26. ed only in heating mode It is expressed in minutes Pa A11 Anti freeze alarm set point Used to set the temperature below which the anti freeze alarm is triggered 17 0612 6180758 rev 01 Pa A12 Anti freeze alarm differential Used to set the anti freeze alarm differential PaA13 Number of anti freeze alarm events per hour Used to set the number of anti freeze alarm events per hour If the number is exceeded the alarm is switched from automatic to manual reset Pa A14 Enable minimum alarm during defrosting Enables the minimum alarm during defrosting If 0 the minimum alarm is disabled during defrosting Pa A15 Over temperature set point Sets the temperature value If exceeded the over temperature alarm E46 is triggered Pa A16 Over temperature ON duration Determines the duration of the condition Al1 gt A25 If exceeded alarm E46 is triggered A17 Turns compressor OFF if over temperature If set to 1 it turns off the compressor if an over temperature alarm is generated Pa A18 Select anti freeze alarm probe 0 probe 1 probe Al2 Compressor parameters Pa C01 OFF ON safety time The minimum period of time that must elap se between turning off the compressor and turning it on again It is expressed in tens of seconds Pa C02 ON ON safety time The minimum period of time that must elap se between turning the compressor on and turning it on again It is expressed in tens of seconds Pa C03 Temp
27. emperature pressure below which the defrost cycle is activated Pa d03 Defrost interval response time The period of time during which the probe remains below the defrost start temperature pressure It is expressed in minutes Pa d04 Defrost end temperature pressure Temperature pressure above which defro sting starts Pa d05 Maximum defrost time time out Maximum duration of defrosting It is expressed in minutes Pa d06 Compressor reversing valve wait time anti bleeding Wait time between compressor shut down and reversal of the 4 way valve at the beginning of the defrost cycle Pa d07 Drainage time Wait time between compressor shut down and reversal of the 4 way valve at the end of the defrost cycle 408 Temperature at which defrost starts if Pa H49 1 Temperature below which the defrost cycle is activated After every parameter change the control device must be turned off and re activated to guarantee its correct operation PARAMETERS TABLE 0612 6180758 rev 01 Pa 409 Temperature at which defrost ends if Pa H49 1 Temperature above which the defrost cycle is ended Pa d10 Enable defrost compensation Refer to temperature compensation at start of defrosting Pa d11 Defrost temperature pressure com pensation offset Refer to temperature compensation at start of defrosting Pa d12 Defrost temperature pressure com pensation set point VRefer to temperature compensation at start of defrosting Pa d13
28. erature control hysteresis in Cooling mode Used to select the activation differential in Cooling mode Pa C04 Temperature control hysteresis in Heating mode Used to select the activation differential in Heating mode Pa C05 Regulation step intervention differential Used to set a temperature differential in rela tion to the set point beyond which the second step is activated Pa C06 Interval between compressor 1 compressor 2 start up step Used to set a delay between turning on the first and the second step Pa C07 Interval between compressor 1 compressor 2 shut down step Used to set a delay between turning off the first and the second step Fan parameters Pa F01 Fan output configuration 0 proportional condensation control TK output 1 ON OFF TK output AERMEC air conditioning 2 anti freeze electric heater output for water water machines with gas reversal 3 TK ON OFF output on compressor Pa F02 Fan pick up time Time during which the fan runs at maximum speed after start up It is expressed in seconds 10 Pa F03 Fan phase shift Used to adapt output to different types of fans 04 Duration of Triac activation impulse Used to vary the length of the Triac impulse F05 Operation in response to compres sor request 0 If compressor is off fan is off 1 Condensation control is carried out independently of compressor Pa F06 Minimum speed in Cooling mode Minimum proport
29. ev 01 r14 If the heat pump is off because the outdoor temperature is too low the electric heaters are directly controlled by the heating set point Freecooling and freeheating accessory FCExx Freecooling and freeheating are used to cool or heat the internal environment using outdoor air The external air enters the environment through a damper that mixes it with the recirculated air from insi de Damper control is ON OFF FREECOOLING The freecooling set point is calculated by subtracting the value equal to parameter F26 freecooling offset in cooling mode from the cooling set point If the freecooling set point were to coincide with the cooling set point the damper would close as the same time as the compressors are switched off and any energy saved by using colder outdoor air would be lost This is valid if the outdoor temperature is lower than the cooling set point the inside temperature is higher than the outdoor temperature If the inside tempera ture is lower than the outdoor temperature and both are lower than the cooling set point the damper is completely open The control hysteresis is 10 C FREEHEATING The freeheating set point is calculated by adding the value equal to parameter F28 freecooling offset in heating mode to the heating set point If the freeheating set point were to coincide with the heating set point the damper would close as the same time as the compressors are switc
30. hed off and any energy saved by using warmer outdoor air would be lost This is valid if the outdoor temperature is higher than the heating set point the inside temperature is lower than the outdoor temperature If the inside tempera ture is higher than the outdoor temperature and both are higher than the heating set point the damper is completely open The control hysteresis is 10 C Damper closed if temperature is low Air that is too cold entering the environment affects the well being of its occupants For this reason if the outdoor temperature is lower than Pa F32 freecooling shutdown set point the damper is forced to minimum opening Pa F31 If the outdoor temperature is higher than Pa F32 Pa F33 the freecoo ling control returns to normal ONR fig 01 ON COMP R electric heater SET POINT HEATING 10 AERMEC IR air conditioning Recording operating hours The device stores the number of operating hours for the following in the non volatile memory evaporator fan compressor Internal resolution is in minutes The values can be displayed by accessing the menu with the label Ohr see menu layout The whole value is displayed for values below 999 whereas hours 100 value along with the decimal point is displayed for values above 999 For example 1234 hours are displayed as follows 123 The hours can be reset by pressing the DOWN butto
31. ional regulation of fans in Cooling mode It is expressed as a per centage from 0 to 100 of the maximum permitted voltage Pa F07 Maximum silent speed in Cooling mode Maximum proportional regulation of fans in Cooling mode It is expressed as a per centage from 0 to 100 of the maximum permitted voltage Pa F08 Minimum fan speed temperature pressure set point in Cooling mode Condensation pressure temperature value below which the fan runs at minimum coo ling speed Pa F09 Proportional band in Cooling mode Difference in temperature pressure that corresponds to a change from minimum to maximum fan speed in Cooling mode Pa F10 Cut off differential Condensation temperature pressure diffe rential within which fan continues to run at low speed Pa F11 Cut off hysteresis Condensation temperature pressure differen tial for fan cut off Pa F12 Cut off bypass time Determines the amount of time after fan start up during which fan cut off is excluded It is expressed in seconds Pa F13 Maximum speed in Cooling mode It sets a speed step corresponding to a specific temperature pressure value in Cooling mode Pa F14 Maximum fan speed temperature pressure set point in Cooling mode Condensation temperature pressure value cor responding to the fan speed set for par F13 Pa F15 Minimum speed in Heating mode Minimum proportional regulation of fans in Heating mode It is expressed as a per centage from 0 to 100 of the maximum
32. n filter digital input must remain active When this period has elapsed the alarm is gene rated The timer starts after the worn filters by pass time It is expressed in seconds Pa A05 Duration of inactive worn filters input Used to set a period of time during which the worn filter digital input must remain inactive When this period has elapsed the alarm is deac tivated It is expressed in seconds Pa A06 Number of worn filter events per hour Used to set the number of worn filter digital alarm events per hour If the number is exce eded the alarm is switched from automatic to manual reset If the alarm is in manual reset mode the fan is shut down Pa A07 By pass time for compressor thermal switch activated by compressor Used to set a delay for triggering the compres sor thermal switch alarm activated by the com pressor It is expressed in seconds Pa A08 Number of compressor 1 and 2 ther mal switch alarm events per hour Used to set the number of compressor thermal switch alarm events per hour If the number is exceeded the alarm is switched from automa tic to manual reset Pa A09 Number of condensing fan thermal switch events per hour Used to set the number of fan thermal switch alarm events per hour If the number is exceeded the alarm is switched from automatic to manual reset Pa A10 Anti freeze alarm by pass time Determines the delay between turning on the machine and activation of the anti freeze alarm it is enabl
33. n for two seconds see buttons while the operating hours are displayed EE In the event of a power failure the last frac tion of hour recorded is set to 0 and the duration is rounded off by default Defrosting The defrost function is only active in Heating mode This function is used to prevent the forma tion of ice on the surface of the external heat exchanger This significantly reduces the thermodyna mic performance of the unit and could cause it severe damage Defrosting is controlled according to pres sure Defrost start and stop commands are given on the basis of condensation probe readings and parameter settings as described below Defrost mode start fig 01 If the condensing pressure is lower than 3 bar defrost starting pressure and the compressor Controls manual Heat recovery unit with cooling circuit URHE_CF is ON the control starts the defrost coun tdown 1 min countdown When 1 min pas sed the control device starts the defrosting process At this point compressor valve time delay 30 sec the control proce dure described in fig 01 is operated This delay prevents the compressor from liquid returns During this operation the safety timings of the compressor are not con sidered The defrost starting and stopping pressures are the following defrost start 3 bar defrost stop 10 bar Defrost mode stop fig 02 The defrosting process stops if
34. ntrols manual Heat recovery unit with cooling circuit URHE CF 0612 6180758 rev 01 that identifies the type of alarm i e E00 E25 E39 The alarm message consists of an Enn code Triggered by the digital input configured as Remote ON OFF see digital inputs Triggered by the digital input ID1 see digital inputs Triggered by the digital input ID2 see digital inputs Triggered by the digital input configured as Compressor 1 thermal switch see digital inputs Triggered by the digital input configured as Fan thermal switch see digital inputs Pa A18 parameter selects the alarm probe Pa A18 20 18 1 External fans and compressors will be shut down Active if analogue probe selected see analogue inputs is configured as NTC probe Pa 06 1 07 1 Triggered when probe 15 detects a value below Pa A11 Goes off if the probe detects a value greater than Pa 11 Pa 12 Triggered if probe confi gured as an analogue input shorts or is cut off or probe limits are exceed 50 C 100 C where nn stands for a two digit number ELECTRIC HEATERS Reset is carried out automatically if the number of events per hour is equal to parameter A02 other vise it switches to manual Not active when time Pa A01 is counted after a compressor is tur ned on or the 4 way valve rever sing valve is reversed Inactive during defrosting if Pa
35. of compressor 1 and 2 thermal switchalarmeventsperhour o 03255 num __ gt Pa A09 04255 Num f2 ___ Pa 10 Anti frost alarm bypass after ON OFF 10255 5 11 Anti freeze alarm set point 2 50 fo 18 Select 0 AI1 anti freeze alarm probe ELECTRIC HEATER PARAMETERS TABLE Values Pa r02 2 Hag o0 Pa r04 i i 1 2 ___ oo 50 ___ Seconds 10 lo eo fo fo 2 2 2 1 EVAPORATOR FAN PARAMETERS Values 30 Delay between compressor OFF and fan OFF 0 255 240 Controls manual 21 8 AERM MEC Heat recovery unit with cooling circuit URHE CF M nen 0612 6180758 rev 01 Par Description Male timits Unit 0 Pa Fan phase shift 8 Os100 0 05 Operation in response to compressor request 10 fos Flag Minimum speed in cooling mode Pa F10 Cut off differential ___ 40 02255 feco kPa 10 Pa F14 Maximum fan speed temperature pressure set point in cooling mode 470_ 500 800 C 10 10 180 _____ Pa F16 Maximum silent speed in heating mode 1100 fos100 _____ 80 Pa F19 Maximum speed in heating mode 100 10 100 f ______ 100 PAF22 Notued o S Pa F23 Hot Start setpoint 055 vC ____ 18 ____ Pa F24 Hot Start hysteresis 10 102255 Pa F25 Pre ventilation in cooling mode 10 10255 Seconds __ Pa F31 Minimum damper opening foao jo Pa F32
36. permitted voltage Pa F16 Maximum silent speed in Heating mode Maximum proportional regulation of fans in Heating mode It is expressed as a per centage from 0 to 100 of the maximum permitted voltage Pa F17 Minimum fan speed temperature pressure set point in Heating mode Condensation pressure temperature value above which the fan operates at minimum speed in heating mode Controls manual Heat recovery unit with cooling circuit URHE_CF Pa F18 Proportional band in Heating mode Temperature pressure differential correspon ding to a change from minimum to maxi mum fan speed in Heating mode Pa F19 Maximum speed in Heating mode It sets a speed step corresponding to a specific temperature pressure value in Heating mode Pa F20 Maximum fan speed temperature pressure set point in Heating mode Condensation temperature pressure value cor responding to the fan speed set for par F19 Pa F21 Not used Pa F22 Not used Pa F23Hot start set point Used to set the temperature on probe Al2 below which internal ventilation is shut down Pa F24 Hot start hysteresis Used to set hysteresis on the hot start fun ction Pa F25 Pre ventilation in Cooling mode It sets a pre ventilation time in Cooling mode before the compressor starts up Pa F26 Freecooling offset in cooling mode Moves the freecooling set point in relation to the cooling set point Pa F27 Freecooling proportional band in Cooling mode Freecooling control band Pa F
37. r specific alar ms if the number of alarms in the last hour exceeds the threshold set for the parameter the alarm switches from automatic to manual reset mode Alarms are sampled every 225 seconds Example if the number of events is set to 3 the duration of the alarm must last between 2 225 seconds and 3 225 seconds for the alarm to be switched from automatic to manual reset Heat recovery unit with cooling circuit URHE CF Diagnostics 0612 6180758 rev 01 If an alarm is triggered more than once within one sampling period 225 seconds it will only be counted once To reset alarms configured for manual reset ting press the ON OFF button and then release it Manual resetting shuts down corresponding loads and requires operator intervention alarm reset using the ON OFF button Manually reset alarms are used to signal potential problems that could damage the system Sampling A automatic reset M manual reset ALARM alarm TIME time Controls manual SAMPLING alarm sampling 12 AERMEC air conditioning List of alarms The alarm appears on the keyboard display When an alarm is triggered it has two effects The corresponding loads are shut down CODE SIGNAL DESCRIPTION Remote Off High pressure digital Low pressure digital Thermal switch protection com pressor 1 protection Anti freeze Probe AI2 faulty Condenser fan thermal switch Co
38. rost function is activated 0 On only when requested by temperatu re controller 1 Always on in Defrost mode Pa r02 Configuration of electric heaters activated in Cooling mode Determines electric heater operating in Cooling mode e 0 Off in Cooling mode 1 On in cooling mode depending on the anti freeze electric heater regulation algorithm Pa r03 Configuration of electric heaters activated in Heating mode Determines electric heater operating in Heating mode e 0 Off in Heating mode 1 On in Heating mode depending on the anti freeze electric heaters regulation algorithm Pa r04 Configuration of anti freeze electric heater control probe in heating mode Determines the control probe of the electric heaters in Heating mode 0 Controls on probe 1 Controls on probe 2 Pa r05 Configuration of anti freeze electric heater control probe in cooling mode Determines the control probe of the electric heaters in Cooling mode 0 Controls on probe 1 Controls on probe 2 Pa r06 Configuration of electric heaters in OFF or stand by mode Determines the status of electric heaters when the unit is in OFF or Stand by mode e 0 Always off in OFF or stand by 1 On in OFF or stand by depending on the anti freeze electric heater control algorithm Pa r07 Anti freeze electric heater set point in Heating mode It represents the temperature in Heating mode below which anti freeze electric hea ters are
39. rt up and shut down opera tions must comply with the safety times set by the user using the parameters described below A safety period must elapse between shut down and start up of the same com pressor compressor on off safety time con trolled by parameter Pa C01 This parameter also applies to when the device is started up Heat recovery unit with cooling circuit URHE_CF Components ELLA A safety period must elapse between one start up and the next compressor on on safety time controlled by parameter Pa C02 Reversing valve The reversing valve refers to the heat pump operating mode The reversing valve is off if the instrument is OFF and on standby Fans The fans are cabled on a single relay output see wiring diagrams The fans are confi gured to operate in continous mode 0612 6180758 rev 01 Electric heating coil MBX and Water heating coil MBC Connect the electric heating coil or the water heating coil to the NO4 relay output see wiring diagrams Controls manual Pa C01 OFF ON safety time Pa C02 ON ON safety time AERMEC SS air conditioning The operating parameters are set in the factory to control the unit depending on the signals given by the temperature and pressure probes There are 3 operating modes Cooling Heating Stand by Cooling this is the summer operating mode in this mode the unit is configu red to generate
40. s and or those given herein Controls manual Heat recovery unit with cooling circuit URHE_CF 0612 6180758 rev 01 Use of the control device According to the reference regulations it is classified In terms of construction as an automatic electronic control device to be incorporated with independent assembly or integrated In terms of automatic operating featu res as a type 1 action control device with reference to manufacturing tolerances and drifts As a class 2 device in relation to protec tion against electrical shock As a class A device in relation to software structure and class Forbidden use Any use other than the permitted use is for bidden Please note that relay contacts supplied are functional and are subject to fault in that they are controlled by an electronic compo nent and be shorted or remain open pro tection devices recommended by product standards or suggested by common sense in response to evident safety requirements shall be implemented outside of the instrument Responsabilities and residual risk ES use on equipment that does not guarantee adequate protection against electric shock water or dust when assembled use on equipment that allows dangerous parts to be accessed without the use of tools 24 installation use on equipment that is not compliant with the standards and regula tions in force AERMEC m a la prima per il clima
41. s configured as active when the con tact is open e The ID3 input is the thermal switch compres sor itis configured as active when the contact is open The ID4 is configured as active when the contact is closed The ID5 input is configured as active when the contact is closed Relay 1 is connected to the compressor Relay 2 is connected to the evaporator fan Relay 3 is connected to the reversing valve Relay 4 is connected to the electric heaters Defrosting fig 01 e fig 02 Defrost starts when the exchanger tempera ture stays cumulatively under the defrosting start temperature for 15 minutes The defrost start temperature is dynamic and can be seen in the fig 01 Defrost times are indicated in the fig 02 High temperature alarm If the temperature of the inlet air is very high this causes considerable over heating If the air temperature exceeds 42 C the instru ment signals an alarm without stopping the compressor Controls manual Heat recovery unit with cooling circuit URHE CF 0612 6180758 rev 01 Parameters setting Temp fig 01 Temp Al4 P ES 20 0 Temp 3 exchanger temperature Temp AI4 outdoor temperature FD end of defrosting fig 02 MAX 9 min COMP RV CV COMP compressor RV reversing valve CV condenser valve 15 AERMEC SS air con
42. s the fol lowing label or decreases the shown value depending on the context Controls manual Heat recovery unit with cooling circuit URHE CF Display In Normal mode the unit displays the control temperature in tenths of degrees Celsius with a decimal point or in Fahrenheit with no decimal point the alarm code if at least one is acti ve If several alarms are active the unit displays the first alarm listed in the Alarm Table f temperature control is not based on the analogue inputs and is linked to the status of a digital input or AI2 configured as digital inputs the On or Off label will be displayed depen ding on whether temperature control is active or not n Menu mode displaying varies according it the position Special labels and codes are used to help users identi fy the function that has been set Decimal point when displaying the ope rating hours it indicates that the value must be multiplied x 100 In normal operation the display shows the temperature given by the NTC probe on the exhaust flow room temperature To display the setting keep the button set pushed for nearly 3 seconds Leds LED 1 compressor 1 e ON if compressor 1 1 is active e OFF if compressor 1 is inactive e BLINK if safety timing is in progress Defrost LED ON if defrosting is active 66 6 e OFF if defrosting is disabled or has been completed e BLINK if timing is in progress defro s
43. ting time Electric heater LED e ON if the internal anti freeze electric heater are on OFF if the internal anti freeze electric heater are off 0612 6180758 rev 01 Heating LED M ON if the unit is in Soe Heating mode Cooling LED ON if the controller Do is in Cooling mode If neither the HEAT LED or the COOL LED are lit the controller is in STANDBY mode On board control panel The control panel on borad of the unit performs the same functions and displays the same parameters of the remote panel The setting procedure are the same described for the remote panel The Upwards arrow buttonoperatesalso as Mode button while the Downwards arrow button operates also as Set but ton Parameter programming Menu levels The setting parameters of the control device may be modified through the control panel keyborad The various parameters are organized in groups accessible when pressing the mode and set alarm buttons at the same time Each menu level is identified by a mnemonic code which appears on the display For more info please refer to the following page URHE CF Heat recovery unit with cooling circuit AERMEC Menu levels Levels hierarch To move through the levels and the labels use the arrow buttons The level 0 always shows the exhaust air temperature or an alarm if active ojawered 9J0
44. yment for damages cause by the incorrect installation of the unit by the installer The warranty does not cover payment for damages cause by the improper use of the unit by the user e The manufacturer is not responsible for accidents to the installer or user that are due to the improper use and incorrect installation of the unit The warranty is not valid when e the maintenance and repairs have been performed by unauthorised persons or companies e the unit has been previously repaired or modified with spare parts that are not original e the unit has not undergone suitable maintenance e the instructions described in the present manual have not been followed correctly e unauthorised modifications have been made Note The Manufacturer reserves the right at all times to make any modification for the improvement of its product and is not obliged to add these modification to machines of previous manufacture which have already been delivered or are being built The warranty conditions are any subject to the general sales conditions at the moment the contract is finalised AERMEC IER air conditioning Generalities The URHE CF units are provided with an electrical panel including the power supply section and the controls the 3 ways valve for the hot water coil if required and the actuators are inclu ded to manage all the functions of the cooling circuit The controls include NT
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