>a__WcU[S^ <[c >a`V[e[a`Wc
yes
Check mainboard and make
necessary replacement
yes
Is electrolytic capacitor
for filtration in good
condition?
no
Check capacitance and
conductivity and make
necessary replacement
1.Check if resistance between re, L1L2L3; and - L1L2L3
complies with diode characteristics.
2. M and - terminals of CN201. Measure voltage between P
and N, which should be 530VDC at 380VAC
no
Is 3-phase rectifier in good
condition?
yes
Is compressor winding resistance
acceptable? Is it stuck?
no
Is compressor in good condition?
yes
Check: 1. Is a valve in system close?
2. Is piping clogged;
3. Is system overfed; is there air in system;
4. (Cooling cycle) Is condenser dirty? Does outdoor fan motor run at
low speed or stop?
5. (Heating cycle) Is evaporator or filter dirty? Does indoor fan motor
run at low speed or stop?
no
Is pressure acceptable?
yes
no
Replace power module
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?
yes
Wrong report. Replace
0010451971 or 0010451530
Is actual compressor current detected
by ammeter or test board (0010451601)
above protection limit 16.9A?
no
yes
Are connectors in
good condition?
Modify power supply circuit
Check and reconnect
yes
no
no
Is supply voltage good?
Lack of phase?
4. Over current protection: outdoor LED302 flashes 6 times
-181-
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 ...