FILE NO. SVM-10020

11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)

(1)Outdoor unit does not operate

1)Is the voltage between L1 and S of the indoor terminal block varied?

Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow- ing diagram.

NOTE:

•Measurement should be performed 2 minutes and 30 seconds after starting of the operation.

•Be sure to prepare a diode for judgment.

Terminal block at indoor side

 

Red

S

S5277G

S5277G or equivalent

White

L1

(Diode with rated voltage of 400V

 

or more is acceptable.)

 

L2

Terminal block

Tester

Normal time

: Voltage swings between DC15 and 60V. ...................

Inverter Assembly check (11-8-1.)

Abnormal time

: Voltage does not vary.

 

(2) Outdoor unit stops in a little while after operation started<Check procedure> Select phenomena described below.

1)The outdoor unit stops 10 to 20 minutes after operation started, and 10 minutes or more are required to restart the unit.

Gas circulation amount is down.

 

 

Gas shortage

 

 

 

 

 

 

Gas leak

 

 

 

 

 

 

 

 

 

 

 

 

Measure gas

pressure.

 

Pipe clogging

 

 

 

 

 

Thermo. operation of compressor

 

 

2)If the unit stops once, it does not operate until the power will be turned on again.

To item of Outdoor unit does not operate.

3)The outdoor unit stops 10 minutes to 1 hour after operation started, and an alarm is displayed. (Discharge temp. error check code 03, 1E Sensor temp. error check code 02, 1C)

Gas leak

P.M.V. is defective.

Refer to the chart in 11-6.

Miswiring of connecting wires of indoor/outdoor units

Clogging of pipe and coming-off of TC sensor

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