Compressor Current Limit Protection; Cooling Mode; Heating Mode - Heat Controller A-VMH18DC-1 Service Manual

Heat Controller, Inc.

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)
COOL_F10
COOL_F9
COOL_F8
COOL_F7
COOL_F6
COOL_F5
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)
HEAT_F12
HEAT_F11
HEAT_F10
HEAT_F9
HEAT_F8
HEAT_F7
HEAT_F6
HEAT_F5
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.
VMH SerieS
Current limit value(A)
ICOOLLMT6
ICOOLLMT5
ICOOLLMT4
ICOOLLMT3
ICOOLLMT2
ICOOLLMT1
Current limit value(A)
IHEATLMT8
IHEATLMT7
IHEATLMT6
IHEATLMT5
IHEATLMT4
IHEATLMT3
IHEATLMT2
IHEATLMT1
Frequency limit
The compressor frequency will decrease to COOL_F4 and
then run at COOL_F4 for 3 minutes.
After that, the frequency will be adjusted according to the
capacity demand, then rise to the next level up every 3
minutes (When the frequency>COOL_F4 via capacity
demand).
Frequency limit
The compressor frequency will decrease HEAT_F4 and
then run at HEAT_F4 for 3 minutes.
After that, the frequency will be adjusted according to the
capacity demand, then rise to the next level up every 3
minutes (When the frequency>Heat_F4 via capacity
demand).
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Service Manual