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3-3-9 When the compressor does not operate
1) Inspection items
(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(RY 72, 73) and B(RY 71) 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) Inspection sequence
* 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 ; RY 73 (4) ´ RY 72 (4)
(2) Comp B measuring ; RY 71 (4) ´ RY 72 (4)
(3) Power input ; RY 72 (3) ´ RY 73(3)
Apply the outdoor power and operate the indoor unit A(B, C)
in the cooling mode.
Normal (comp A (B ) off)
Keep Comp A (B) off
*Refer to the power measuring terminal
Normal
Defect of comp A (B) and running condenser
→ Replace
Defect of Ry 72, 73 (Comp B) and Ry 71(comp A)
contact and coil → Replace
Defect of IC 06 output
→ Replace
Defect of Ic 04 (micom)
→ Replace
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 no. 14, 13( 15) at low
(DC 0.7V)?
Is the voltage of pin no. 50, 51 (52) of IC 04 (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?
YES
YES
YES
YES
YES
YES
NO
Normal (comp A (B) off)
Is the comp A under the operating condition?
YES
NO
NO
NO
NO
NO
NO
RED
BLK
RY72
RY71
BLK
WHT
RED
WHT
RY73
(3)
(4)
(3)
(4)
(3)
(4)
DB98_05645A(1)_1 5/30/02 7:04 PM Page 19