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Heat Controller, Inc. VMH SerieS Service Manual
Yes
9.3.2.9 IPM module compressor (ODU P4)
IPM module protection
Replace the connecting
line or reactor or replace
the PFC module for a
A-VMH36QC-1
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
Replace the bridge rectiers
Yes
Yes
Yes
No
No
No No
No
No
No
No
Replace the IPM module,
check whether the system
can work normally?
Replace the main board;
check whether the system
can work normally?
Replace the compressor.
Check whether the
connecting line of the
compressor is connected
correctly or tightly
Check whether the
connecting line between main
board and the IPM module is
connected tightly
Connect it well
check ok or not?
Connect it tightly,
check ok or not?
No
No
No
Yes
Yes No
Yes
Yes
No
No
No
Check whether the
input power supply is
correct? 220-240V,
1PH 60Hz
Regulate it to
correct, then check
whether the system
can work normally?
Check whether the
power supply line is
connected correctly
and tightly
Connect it correctly
and tightly, check ok
or not?
Check whether
the wires in E-part
box are connected
tightly
Connect it tightly,
check ok or not?
Check whether the bridge rectiers
are normal? Use the multimeter to
measure the resistance between
each two terminals, check whether
the value of resistance is 0
Check whether the connecting line
of every reactor is normal? If the
line is broken, the resistance of the
two ports is (for all models except
A-VMH36QC-1); Check whether the
PFC module broken A-VMH36QC-1
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