>a__WcU[S^ <[c >a`V[e[a`Wc
Check low voltage and make
necessary replacement
yes
Replace power module
no
1.Is output voltage among U, V and W balanced?
2.Disconnect all terminals. Is resistance between P
and N; P and U, V, W; N and U, V, W acceptable?
no
1.Is voltage of supply circuit too low?
2.Is heat exchanger or indoor fan motor broken?
3.Is ambient temperature too high? Is system
overloaded?
yes
Is current up to protection
limit of power module?
no
Is silica gel well distributed on radiation fins?
yes
Is power module too hot?
yes
Is compressor winding resistance
acceptable? Is it stuck?
no
if the compressor is normal
no
Replace power board
yes
Check point: CN12 in mainboard.
Is four-way supply voltage less than
13.5V (normal value: 13.5-16.5VDC)
yes
Replace rectifiter
no
Check point: + and - pins of CN201 in
power source board. Is output voltage
of rectifier acceptable (530VDC at
380V)
no
yes
Check and reconnect
yes
yes
Replace cable
Is 9-pin connector between IPM
and low voltage board short-circuit
or in poor contact?
Are connectors in light
current board in poor
contact?
5. IPM power module protection
9 flashes of outdoor LED302 light.
Possible causes: 1. Short-circuit or overcurrent
2. Control supply is less than 13.5V.
3.Module is hot with a temperature higher than 145° C
yes
Is there any damaged component
in power module driver?
no
Replace power module driving board
-182-
Summary of Contents for H-MRV AF092FCBHA
Page 121: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB top layer printed diagram 121 ...
Page 122: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB bottom layer printed diagram 122 ...
Page 127: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA high voltage PCB printed diagram 127 ...
Page 131: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA low voltage PCB printed diagram 131 ...
Page 152: ... a__WcU S c a V e a Wc AB092 182FCBHA PCB printed diagram 152 ...
Page 156: ... a__WcU S c a V e a Wc AE FCBKA PCB printed diagram 156 ...
Page 199: ...MEMO Commercial Air Conditioner ...