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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
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).
COOL_F9 ICOOLLMT5
COOL_F8 ICOOLLMT4
COOL_F7 ICOOLLMT3
COOL_F6 ICOOLLMT2
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.
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).
HEAT_F11 IHEATLMT7
HEAT_F10 IHEATLMT6
HEAT_F9 IHEATLMT5
HEAT_F8 IHEATLMT4
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.