Chiller MQH-R410A (GB)
Contents
1. Display Description Cl When compressor is operating CIH Compressor in heat mode DEIC defrost in operation OFF Off mode COOL Cool mode with no compressors on HEAT Heat mode with no heating on 2 3 STARTING AND USING THE UNIT e To start stop the unit press for 5 secs the SCROLL key e To remotely stop the unit open the connection between No 7 and No 8 on the terminal board MQH 11 08 During the normal operation if the connection bet ween No 5 and No 6 terminal is closed the unit will operate in heating mode When the connection is opened the unit will operate in cooling mode If con nection 5 6 is open then OPER mode can be selected by display To modify operative mode or the setpoints press both and gt keys at the same time for 5s then the OPEr message appears on the display The parameters are scrolled using the button and selected using the gt but ton When selected the values can be changed by using the button to scroll from the present value to max then min and can be selected by pushing the gt button After selection the menu will return to the beginning of the same parameter change menu If no button is pres sed for 10s the display reverts back to normal mode ITELCO INDUSTRY TABLE LIST OF STANDARD PARAMETERS Display Meaning Min value Max value Step Definit OPEr Cooling Heating mode selectio2. Cooling compensation offset DEWT EWT derivative DEWT EWT t EWT t 1 dt C min EP Evaporating pressure EWT Entering water temperature EWTM Maximum entering water temperature FP Freeze protection minimum LWT FS Flow switch to detect sufficient water flow HPC High pressure cut out HSPT Heating setpoint temperature HDCO Heating compensation offset LO Low fan speed LOAT Low level of the external temperature LSL Low speed limit LWTM Minimum leaving water temperature LWT Leaving water temperature MCB Main control board NM Night mode OAT Outdoor air temperature OD Outdoor OFAN Outdoor fan PGI Percent of glycol in the water RC Reverse cycle heat pump RV Reversing valve SPT Setpoint temperature ST Standard model cooling only tC Comp timer TH Trace heater for frost protection Eph Low pressure heating adjust iD Defrosting duration THC Coil heater BYP TXV by pass during defrost EPCR Evaporating Pressure Calculation function of OAT EPIC Evaporating Pressure Iced Coil EPCC EP Clean Coil OPEr Parameter for mode selection in standard parameter LOAt OAT limit valve for THC activation ITELCO INDUSTRY 2 1 PRELIMINARY CHECK The checks listed below shall be performed before start ing the unit e Check the section of power supply and grounding cables make sure that terminals are tightened and check the correct operation of contactors with the master switch open e Check that any voltage and phase variation in the power
3. 18 C above the temperature of the air entering the condenser for R 410a units LP side Approx the difference between the temperature of the leaving water and saturated evaporating temperature must be in the 2 4 C for R 410a units 2 5 SYSTEM DIAGNOSTICS AND OPERATION AT FAULT CONDITIONS FAULT RESPONSE LWT sensor failure If in cooling then stop machine EWT sensor failure Use EWT LWT 5 EWT amp LWT failure together Stop machine OAT sensor failure Use OAT 35 cooling 8 heating Variable speed in heating always in maximum speed CP sensor failure Fans to max speed when OAT gt 20 C Fans to low speed when 15 C lt OAT lt 20 C If OAT lt 15 C stop the unit in cooling only Disable vs In heating end defrost only with OCT gt OCTe or Td gt Tde EP sensor failure In cooling mode correct CSPT to CSPT gt FP 7 In heating if OAT lt 10 C start defrost routine every 40 mins and end defrost routine after 90 sec OCT failure or CP amp OCT failure In heating if OAT lt 10 C start defrost routine every 40 mins and end defrost routine after 90 sec Variable speed in cooling always in maximum speed EP amp CP failure Stop the unit 11 MGH 11 08
4. EP protection correction in cooling bar 0 1 0 2 0 4 EWTn EWTM max EWT only in cooling C 16 40 1 24 Eph Low pressure heating adjust bar 0 0 1 0 3 tde Defrost cycle maximum duration min 2 10 1 5 dd Delay time for defrost cycle min 10 60 5 35 OCTi OCT defrost start value C 10 10 1 3 OCTe OCT defrost exit value C 5 30 1 12 CPe CP defrost exit value bar 15 40 1 34 EPi EP defrost enter value bar 1 8 10 0 2 5 4 COF Off comp exiting defrost cycle flag 0 1 0 b4 B4 analog input type ntc rAt none Nic b5 B5 analog input type ntc rAt none rAt e During normal operation the current value of entering water temperature is displayed flashing alternatively with the current status To display other useful data go to level 1 use the button to scroll the menu and use the gt button to select the display value MGH 11 08 DISPLAY DATA ITELCO INDUSTRY PARA READING PArA Code Parameter Meaning DE TO Triac output CSPT cooling setpoint enabled HSPT heating setpoint enabled tD last defrosting time SENSOR READING SEnS HRS RUNNING HOURS HRS Code Parameter Meaning Cl Compressor 1 running hours x 10 tC1 Compressor 1 running hours by the last reset LOG LAST 10 ALARM LOG Code Parameter Meaning Code Parameter Meaning EWT entering water temperature LWT leaving water temperature CP d
5. ITELCO INDUSTRY ITELCO INDUSTRY Service Manual Chiller unit MQH R 410A Release Date ITELCO INDUSTRY MQH R410A ELECTRONIC CONTROL CONTROL PANEL The control panel allows the user to carry out all the operations related to the use of the controller in particular e To set the operation parameters e To manage alarms e To check the status 1 Display Display the status of the unit entering leaving water and ambient air temperatures compressor discharge pressure setpoint running times alarm code alarm history etc 2 Enter Key Select the display value or to program and modify system values 3 Scroll Key Scroll the menu 1 TECHNICAL CHARACTERISTICS 1 1 ELECTRICAL PERFORMANCE Maximum Rating ltem Spec Rated input voltage e 24 V Single Phase 50 Hz or 60 Hz Protected with on board fuse Operating input voltage range e 20 4 26 4 Vac MQH 11 08 No damage input voltage range e 16 32 Vac Maximum current e 0 5A 24Vac Minimum power factor e 0 92 Power consumption in stand by e lt 5W 2 1 2 e The control box is in compliance with European cur GENERAL SPECIFICATIONS rent standard about emissions and immunity e m c e The miniCAC control board mounted in a IP20 plastic case The plastic is in compliance with UL94VO ITELCO INDUSTRY e Flash memory is used to store the program enable re downloa
6. d via 10 bit A D converter in factory and at site e During power failure with a duration more then 40 msec the control goes off and will random restart after power comes back according the dip 5 position 1 3 COMPATIBILITY WITH OTHER PRODUCTS AND SYSTEMS 1 3 1 ELECTRICAL INTERFACES Analogue Input Digital Input N Type N Chiller Bl NTC ID Remote Unit Start Stop B2 NTC ID2 Cooling Heating mode selection B3 NTC ID3 Fan motor overload BA NTC ratio or 2nd compressor protection B5 NTC ratio ID4 Compressor motor protection ID5 Flow switch Water diff pressure switch ID6 Low pressure switch ID7 High pressure switch ID8 Night Mode Second setpoint Digital output N Chiller Type of relay Type ac motor rating 1C O Compressor 2A 230Vac N A 2C O Fan high speed or 2nd comp 4A 230Vac N A 3C O Fans motor or low speed See note 1 TRIAC see note 1 AC O Antifreeze heater 2A 230Vac N A 5C O Reversing valve 2A 230Vac N A 6C O Pump 4A 230Vac N A 7C O Unit alarm relay 2A 230Vac N A MGH 11 08 ITELCO INDUSTRY 2 START UP amp OPERATING INSTRUCTIONS MGH 11 08 ABBREVIATIONS SYMBOL DESCRIPTION BMS Building management system Cl Compressor CP Condensing pressure CSPT Cooling setpoint temperature CDCO
7. ischarge pressure EP suction pressure CPS saturated discharge temperature EPS saturated suction temperature OAT room air temperature OCT sensor temperature in coil ALARM CODE READING Code Parameter Meaning ALARM see alarm list STATUS READING STat Code Parameter Cl Meaning Compressor 1 on off RV REVERSING VALVE Rv on heating mode Rv off cooling mode ALARM see last alarm exhisting EH ON or OFF Pump Pump on off OFAN Fan on off dEIC defrost in operation MODE OFF or COOL or HEAT MGH 11 08 ITELCO INDUSTRY e If an alarm is occurred the alarm code is displayed but after 30 even if the alarm is still active the display shows again the mode but Alarm message is display ed for 2 every 10 when an alarm is active When we enter in Alarm list the first alarm code dis played is the last occurred ALARM SUMMARY Fault as on display Fault description ADC ADC error CPF CP transducer failure out of range EPF EP transducer failure out of range REF Refrigerant leak low pressures CPne CP transducer failure no change error EPnc EP transducer failure no change error CFC CP and EP no change compressor not operating burn out or phase change EWTH EWT entering water temperature sensor short circuited EWTL EWT entering water temperature se
8. n COOL HEAT COOL CSP Cooling Setpoint CSPL 23 0 5 12 HSP Heating Setpoint 20 47 1 40 gLY Glycol 0 30 10 0 nigh Night mode 4 1 2 COAL CSPT compensation low limit 10 30 2 20 COAH CSPT compensation high limit 20 36 2 30 CDCO CSPT compensation 0 8 6 HDCO HCSPT compensation 0 15 8 HOAL HCSPT compensation low limit 10 10 1 5 HOAH HCSPT compensation high limit 0 20 1 10 HPCE 1 auto reset for HPC alarm O 1 1 0 ND Night mode differential 0 15 1 2 NFC Night mode fan change 4 4 1 2 Id Identification address 0 255 1 0 FO Factory parameter 0 9 0 Fl Factory parameter 0 9 0 F2 Factory parameter 0 9 0 MGH 11 08 ITELCO INDUSTRY TABLE LIST OF FACTORY PARAMETERS DEFAULT VALUES ACCORDING TO DIP 8 SELECTION If you want to change the parameter value you must get the password from the factory or your authorized service support Display Meaning Unit Min value Max value Step P perau T CSPI Minimum Cooling setpoint C 5 14 1 8 FL Fluid paremeter 0 2 0 5 0 CPL Condensing Pressure Limit bar 0 50 0 5 40 TCO Min condensing temperature C 0 100 20 TCl Condensing temperature setpoint G 0 100 1 30 TC2 Max condensing temperature C 0 100 1 50 rpml Min Triac output 0 100 5 20 rpmh Max Triac output 0 100 5 100 OATI Low OAT value in heating fan control s 0 50 1 15 OAT2 High OAT value in heating fan control C 0 50 1 30 LOL
9. nsor short disconnected LWTH LWT entering water temperature sensor short circuited LWTL LWT entering water temperature sensor short disconnected OATH OAT outdoor air temperature sensor short circuited OATL OAT outdoor air temperature sensor short disconnected OCTH OCT coil temperature sensor short circuited OCTL OCT coil temperature sensor short disconnected HP High pressure protection automatic reset for first three times HPC High pressure cut out LP Low pressure limit unit cut out LO Leaving water temperature below allowed limits HI EWT is too high FS Flow switch opens low water flow CF1 CF1 input open compressor 1 overload OF1 OF 1 input open outdoor fan overload PF PF input open pump internal overload LOu Low water volume ConF Not allowed configuration 2 4 CHECKING THE OPERATION Check the following e The temperature of the water entering the evaporator e The temperature of the water leaving the evaporator e The level of the water flow rate in the compressor and in case of stabilized operation e The fan s current absorption 10 MQH 11 08 ITELCO INDUSTRY Check that the condensing and evaporation temperatu res during operation at high and low pressure detected by the pressure gauges of the refrigerant are within the following range on the units not provided with HP LP pressure gauges for the refrigerant connect a pressure gauge to the Schreader valves on the refrigeration circuit HP Approx 13 to
10. supply dose not exceed the prefixed thresholds e Check that the components of the external water circuit user equipment filters power supply tank and reser voir if any have been installed properly and accord ing to the manufacture s instructions e Check the filling of the hydraulic circuits and make sure that the fluid circulation is correct without any trace of leaks and air bubbles e Check that the direction of rotation of the pumps is cor rect and that fluids have been circulating for at least 4 hours Then clean the filters on the suction side of the pumps e Adjust the liquid distribution network in such a way that the flow rate is within the specified range e Check that the water quality is up to the specifications e Check that oil heaters if any have been turned on at least 4 hours before it is mandatory if the temperature is under 15 C DIP SWITCH CONFIGURATION 2 2 BEFORE START UP Before you startup the unit you must check the DIP switch setup DIP NO POSITION OFF POSITION ON one 1 U BMS MODBUS ON 2 Not used OFF 3 No auto restart Auto Restart after power failure OFF 4 No OAT compensation OAT compensation ON 5 Cooling only unit Heatpump unit ON 6 No auto fan Auto FAN OFF 7 Pump ON when unit is ON Pump always ON OFF 8 Refrigerant R 407C Refrigerant R 410A ON Turn ON the main switch of the power line MQH 11 08 ITELCO INDUSTRY
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