Heat Controller A-VMH18DC-1 Compressor current limit protection, Cooling mode, Heating mode

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Heat Controller, Inc.

VMH Series

Service Manual

 

 

 

8.5.4 Compressor current limit protection

If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be limited per the table below.

Cooling mode:

Current frequency(Hz)

Current limit value(A)

Frequency limit

 

 

 

COOL_F10

ICOOLLMT6

The compressor frequency will decrease to COOL_F4 and

 

 

COOL_F9

ICOOLLMT5

then run at COOL_F4 for 3 minutes.

COOL_F8

ICOOLLMT4

 

 

 

After that, the frequency will be adjusted according to the

COOL_F7

ICOOLLMT3

capacity demand, then rise to the next level up every 3

 

 

COOL_F6

ICOOLLMT2

minutes (When the frequency>COOL_F4 via capacity

 

 

demand).

COOL_F5

ICOOLLMT1

 

 

 

 

If the current frequency is lower than COOL_F4, the frequency will not be limited.

After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later and re-check.

Heating mode:

Current frequency(Hz)

Current limit value(A)

Frequency limit

 

 

 

HEAT_F12

IHEATLMT8

The compressor frequency will decrease HEAT_F4 and

 

 

then run at HEAT_F4 for 3 minutes.

HEAT_F11

IHEATLMT7

 

 

 

 

HEAT_F10

IHEATLMT6

After that, the frequency will be adjusted according to the

HEAT_F9

IHEATLMT5

capacity demand, then rise to the next level up every 3

minutes (When the frequency>Heat_F4 via capacity

 

 

HEAT_F8

IHEATLMT4

demand).

 

 

 

HEAT_F7

IHEATLMT3

 

 

 

 

HEAT_F6

IHEATLMT2

 

 

 

 

HEAT_F5

IHEATLMT1

 

 

 

 

If the current frequency is lower than HEAT_F4, the frequency will not be limited.

After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later and re-check.

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Contents Inverter Flex Multi-Zone Ductless Mini Split Contents General information of Outdoor Units .Features Dimensions VMH18DC-1 VMH27TC-1VMH36QC-1 Refrigeration Cycle Diagram Indoor Outdoor Indoor units combination 30100ft 45150ft 60200ft Wrench torque sheet for installationConnecting the cables Pipe length and elevationAir purging with vacuum pump Installation for the first timeAir purging by refrigerant Procedure Adding the refrigerant if the pipe length 5m16.5ft ProcedureAdding the refrigerant due to loss of charge Replacing the indoor unit Collecting the refrigerant into the outdoor unit ProcedureAir purging by the refrigerant Procedure Replacing the outdoor unit Evacuation for the whole system ProcedureRefrigerant charging Procedure Outdoor unit point check function AbbreviationsElectric control working environment Outdoor unit’s digital displayFrequency of compressor Low voltage protection ProtectionCompressor current limit protection Cooling modeHeating mode Oil return Running rules Indoor / outdoor units communication protectionHigh condenser coil temp. protection Outdoor unit anti-freezing protectionIndoor Ceiling Cassette error codes Indoor Mini-Split error code explanations2Outdoor unit error code explanation 3Trouble shooting See a VMH Series Indoor fan speed has been out of controlDC fan motor Zero-crossing signal errorIndoor fan speed has been out of controlAC fan motor Full-water malfunction For Ceiling Cassette Open or short circuit of temperature sensor2 1 Outdoor Eeprom malfunction ODU E0 Outdoor temp. too low protectionOptional for some modelsVoltage protection ODU E5 VMH Series Check whether the wiring Temperature protection of compressor discharge ODU P0Temperature protection of compressor top ODU P0 High pressure protection ODU P1 Only for A-VMH36QC-1 Find the leak by charging nitrogen or refrigerant Low pressure protection ODU P2 Only for A-VMH36QC-1Current protection of compressor ODU P3 Yes No IPM module compressor ODU P4High temperature protection of condenser ODU P6 Inverter compressor drive protection ODU P7 High PFC module protection ODU P6 Only for A-VMH36QC-1Ohm Appendix Appendix VMH Series Position Resistance Value YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B 10-2012

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