Itelco Industry MQH R 410A Service Manual Download

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MQH 11/08

DISPLAY DATA

Code Parameter

Meaning

PARA READING (PArA)

TO (Triac output)

CSPT

cooling setpoint enabled

HSPT

heating setpoint enabled

last defrosting time

Code Parameter

Meaning

SENSOR READING (SEnS)

EWT

entering water temperature

LWT

leaving water temperature

discharge pressure

suction pressure

CPS

saturated discharge temperature

EPS

saturated suction temperature

OAT

room air temperature

OCT

sensor temperature in coil

Code Parameter

Meaning

ALARM CODE READING

ALARM

see last alarm exhisting

Code Parameter

Meaning

HRS RUNNING HOURS (HRS)

Compressor 1 running

hours x 10

tC1

Compressor 1 running hours

by the last reset

Code Parameter

Meaning

LOG LAST 10 ALARM (LOG)

ALARM

see alarm list

Code Parameter

Meaning

STATUS READING (STat)

Compressor 1 on/off

REVERSING VALVE

Rv on = heating mode

Rv off = cooling mode

ON or OFF

Pump

Pump on/off

OFAN

Fan on/off

dEIC

defrost in operation

MODE

OFF or COOL or HEAT

Summary of Contents for MQH R 410A

Page 1: ...Service Manual Chiller unit MQH R 410A Release Date Rev Review Date november 2008 ...

Page 2: ...tures 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 Rated input voltage 24 V Single Phase 50 Hz or 60 Hz Protected with on board fuse Operating input voltage range 20 4 26 4 Vac No damage i...

Page 3: ...DUCTS AND SYSTEMS 1 3 1 ELECTRICAL INTERFACES Analogue Input N Type B1 NTC B2 NTC B3 NTC B4 NTC ratio B5 NTC ratio 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 4C O Antifreeze heater 2A 230Vac N A 5C O Reversing valve 2A 230Vac N A 6C O Pump 4A 230Vac ...

Page 4: ...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 L...

Page 5: ...e 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 Adjust the liquid distribution network in such a way that the flow rate is within the specified range Check that the water quality is up to the specifications Check that oil heaters if any have been turned on at least 4 hours before it ...

Page 6: ...l 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 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 but ton When selected the values can b...

Page 7: ... CSPT compensation low limit 10 30 2 20 COAH CSPT compensation high limit 20 36 2 30 CDCO CSPT compensation 0 8 1 6 HDCO HCSPT compensation 0 15 1 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 0 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 F0 Factory param...

Page 8: ...AT2 High OAT value in heating fan control C 0 50 1 30 LOL 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 1 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...

Page 9: ... suction temperature OAT room air temperature OCT sensor temperature in coil Code Parameter Meaning ALARM CODE READING ALARM see last alarm exhisting Code Parameter Meaning HRS RUNNING HOURS HRS C1 Compressor 1 running hours x 10 tC1 Compressor 1 running hours by the last reset Code Parameter Meaning LOG LAST 10 ALARM LOG ALARM see alarm list Code Parameter Meaning STATUS READING STat C1 Compresso...

Page 10: ...emperature 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 ...

Page 11: ...ays in maximum speed CP sensor failure Fans to max speed when OAT 20 C Fans to low speed when 15 C OAT 20 C If OAT 15 C stop the unit in cooling only Disable vs In heating end defrost only with OCT OCTe or Td Tde EP sensor failure In cooling mode correct CSPT to CSPT FP 7 In heating if OAT 10 C start defrost routine every 40 mins and end defrost routine after 90 sec OCT failure or CP OCT failure I...

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