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
Apply the outdoor power and operate the indoor unit A(B, C)
in the cooling mode.
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| NO |
Is the comp A under the operating condition? |
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| YES |
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Has 3 minutes passed COMP A(B) after the power initial | NO | ||
and COMP on/off |
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| YES |
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Is comp A (B) on? |
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| YES | ||
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| NO *Refer to the power measuring terminal | ||
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Normal (comp A (B) off)
Keep Comp A (B) off
Normal
Is the voltage (the rating voltage ±10% range) shown across the terminal of Comp A(B) power applied?
YES
Defect of comp A (B) and running condenser
→Replace
| NO |
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Is the voltage of pin no. 14, 13( 15) at low | YES | |
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(DC 0.7V)? |
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| NO |
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Is the voltage of pin no. 50, 51 (52) of IC 04 (micom) at | YES | |
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high (DC 5V)? |
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| NO |
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Is comp A (B ) under the operating condition? | YES | |
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| NO |
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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
Normal (comp A (B ) off)
*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 | BLK |
| (3) RY72 (4) |
BLK
* Comp A(B ) power measuring terminal | WHT |
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(1) | Comp A measuring ; RY 73 (4) ´ RY 72 (4) | (3) RY71 (4) | |
(3) RY73 | WHT | ||
(2) | Comp B measuring ; RY 71 (4) ´ RY 72 (4) | (4) | |
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| RED |
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(3) | Power input ; RY 72 (3) ´ RY 73(3) |
| RED |
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