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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Heat Controller A-VMH18DC-1, A-VMH36QC-1, A-VMH27TC-1 Compressor current limit protection, Cooling mode, Heating mode

A-VMH18DC-1, A-VMH36QC-1, A-VMH27TC-1 specifications

The Heat Controller A-VMH series, consisting of models A-VMH27TC-1, A-VMH36QC-1, and A-VMH18DC-1, represents a sophisticated range of advanced heating and cooling systems designed for residential and commercial applications. These units are engineered to provide efficient climate control, ensuring optimal comfort throughout the year.

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