Checking The Outdoor System - Panasonic CU-5E34NBE-C Technical & Service Manual

8-3. Checking the Outdoor System

8-3-1. Checking the outdoor unit
No.
1
•
Apply 220 V AC between terminals L and N on the
outdoor unit terminal plate.
2
•
Short-circuit the T-RUN terminal to the COM terminal
of TEST/T-RUN terminals.
NOTE If the above check items are okay, but the outdoor unit does not operate, there may be a faulty
connection between the indoor unit and the outdoor unit.
8-3-2. Checking the defrost operation
Using forced defrost operation to check this function.
No.
1
•
Connect a dummy resistor of 39 k ohm to the outdoor
coil temperature sensor connector.
Work procedure
Work procedure
Check items (unit operation)
•
The LED (red) on the control board must illuminate.
•
The compressor, fan motor, 4-way valve, and solenoid
valve (for the hot gas bypass) must turn ON.
(They turn ON about (70) seconds later after the power
is turned ON.)
Check items (unit operation)
Non-stop defrost
Indoor fan
Setting
CM
Solenoid valve
(for hot gas
bypass)
OFF
Outdoor fan
ON
Defrost start
•
The maximum length of defrost operation is 12
minutes.
Defrost can also be released based on the below
conditions for the outdoor heat exchanger sensor.
Less than 2 minutes
2 minutes or more
*1 However, the condition is (20 °C) or higher when the
outdoor air temperature is below 0 °C.
29
30 sec.
LL Stop
(70 Hz)
ON
5 sec.
ON
OFF
Release
Not released
14 °C or higher (*1)
Setting
10 sec.
OFF
ON