Midea DLCMB - Page 70

IPM module protecon
Check whether the voltage range
of P-N on IPM module is normal
DC277-356V for 18-27KBtu/h;
DC277-410V for 36-48KBtu/h
Yes
Yes
No
Yes
Check whether the input
power supply is correct
208-230V, 1N, 60Hz
No No
Regulate it to correct, then
check whether the system
can work normally
Check whether the
power supply line is
connected correctly and
ght
Yes
Connect it correctly
and ght
No
Is the connecng line between
main board and the
IPM module is well
connected?
Yes
No
No
No
Is the connecng compressor
line connected
correctly and ght?
Replace the IPM module,
check whether the system can
work normally?
No
No
Replace the main board; check
whether the system can work
normally
No
Replace the compressor, check
whether the system can work
normally
Check whether the lines
in E-part box are
connected ght
Yes
No
No
Yes
No
Replace the bridge recfiers
Check whether the bridge recfiers are
normal. Use the mulmeter to measure
the resistance between the two
terminals. Check whether the resistance
value is 0.
Replace the connecng line or
reactor or replace the PFC
module(for M4OF-36HFN1-
M&M5OF-48HFN1-M)
Yes
No
No
Yes
Problem solved
Check if the outdoor fan
runs properly or the outdoor
unit venlaon is good.
No
Refer to the Fan Speed is Out
of Control. Determine the
cause and resolve.
Yes
Yes
Yes
Connect it correctly
and ght
Connect it correctly
and ght
Connect it correctly
and ght
Is the connecting line for every reactor
normal? If the line is broken,
the resistance of the two ports is
Check if the PFC broken module
(for M4OF-36HFN1-M & M5)F-48HFN1-m)
DLCM(R/H)B: Service Manual