Samsung MH052FDEA, Training Manual

Page: 103 / 158

Samsung Electronics 102
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Troubleshooting
Yes
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8-3-9 When the compressor does not operate
1. Checklist :
1) Is the Comp. under the operating conditions? (cooling operating of A, B(C) room)
2) Is the power voltage normal? (the rating voltage ±10% range)
3) Is the connector connection of Comp. good?
4) The Comp. is operated on and off in accordance with the operating conditions of indoor unit of A(B, C) room.
2. Troubleshooting procedure
✳
Comp. A (B) operating conditions
(1) Comp. A : Comp. on /off control in accordance with the A room during the heating and cooling indoor unit operation
(2) Comp. B : Comp. on /off control in accordance with the B(C) room during the heating and cooling indoor unit operation
✳
Comp. A(B) power measuring terminal
(1) Comp. A measuring ; RY73 (4)
↔
RY72 (4)
(2) Comp. B measuring ; RY71 (4)
↔
RY72 (4)
(3) Power input ; RY72 (3)
↔
RY73(3)
*Refer to the power measuring terminal
RED
BLK
RY73
RY71
BLK
RED
WHT
RY72
(3) (4)
(3) (4)
(3) (4)
Keep Comp. off
Normal
Defect of Comp. and running condenser
→
Replace
Defect of RY72, 73 (Comp. B) and
RY71(Comp. A) contact and coil
→
Replace
Defect of IC06 output
→
Replace
Defect of IC04 (micom)
→
Replace
Normal (Comp. off)
Apply the outdoor power and operate the indoor unit A(B,C,D)
in the cooling mode.
Normal
(Comp. off)
Has 3 minutes passed Comp. after the power initial and Comp.
on/off
Is Comp. on?
Is the voltage of pin #14, 13(15) at low
(DC 0.7V)?
Is the voltage of pin #50, 51(52) of IC04 (micom) at
high (DC 5V)?
Is Comp. under the operating condition?
Is the voltage (the rating voltage ±10% range) shown across the
terminal of Comp. power applied?
Is the Comp. under the operating condition?
DB98_20402A(1)_2 10/26/04 3:27 PM Page 102