Heat Controller A-VMH18DC-1, A-VMH36QC-1, A-VMH27TC-1 IPM module compressor ODU P4, Yes No

Heat Controller, Inc. VMH Series Service Manual

9.3.2.9 IPM module compressor (ODU P4)

IPM module protection

Check whether the voltage range
of P-N on IPM module is normal?
		No
DC277-356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
	Yes

Check whether the						Connect it tightly,
connecting line between main
					No
board and the IPM module is						check ok or not?
connected tightly
	Yes
				No
Check whether the						Connect it well
connecting line of the
					No
compressor is connected						check ok or not?
correctly or tightly
	Yes
					No
Replace the		IPM module,
check whether			the system
can work		normally?
	No
Replace the		main board;
check whether			the system
can work		normally?
	No
Replace the compressor.

Yes

Check whether the							Regulate it to
							correct, then check
input power supply is			No			whether the system
correct? 220-240V,						can work normally?
1PH 60Hz
	Yes
		No
Check whether the							Connect it correctly
power supply line is					No
							and tightly, check ok
connected correctly								or not?
and tightly
	Yes
				No
Check whether							Connect it tightly,
the wires in E-part
			No
box are connected							check ok or not?
tightly

Yes No

Check whether the bridge rectifiers are normal? Use the multimeter to measure the resistance between each two terminals, check whether the value of resistance is 0

No

Yes

Replace the bridge rectifiers

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
8
A-VMH36QC-1); Check whether the
PFC module broken A-VMH36QC-1	No

Replace the connecting line or reactor or replace the PFC module for a A-VMH36QC-1

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