No
No
Yes
Yes
Yes
Yes
Yes
Troubleshooting
49Samsung Electronics
Yes
Yes
No
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No
6-3-9 When the compressor does not operate
1. Checklist :
1) Is the COMP A under the operating conditions? (cooling operating of A, B(C) room)
2) Is the power voltage normal? (the rating voltage ±10% range)
3) Are the connector connection of COMP A(RY72, 73) and B(RY71) good?
4) The COMP A(B) 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 A (B) off
Normal
Defect of comp A (B) 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 A (B) off)
Apply the outdoor power and operate the indoor unit A(B.,C)
in the cooling mode.
Normal
(comp A (B) off)
Has 3 minutes passed COMP A(B) after the power initial and
COMP on/off
Is comp A (B) 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 A (B) under the operating condition?
Is the voltage (the rating voltage ±10% range) shown across the
terminal of Comp A(B) power applied?
Is the comp A under the operating condition?
DB98_16045A(4)_1 1/29/04 4:57 PM Page 49
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