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4. Service procedures
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4
Section
– 105 –
SM830076
(14) Check Pins
When shorting check pins on the indoor and outdoor PCBs, operations shown on the above table will be
performed on each indoor and outdoor unit. Use check pins to perform a quick check.
• When checking pin operation, stop the indoor and outdoor units with the remote control unit.
(14)-1. FORCED OPR pin of the indoor controller
● Switch the pin from normal operation to check operation
• Relay RY6 turns ON ➞ Indoor fan motor operates at the “H” fan speed.
• Relay RY2 turns ON ➞ Dew prevention heater (DPH) turns ON.
➞ Indoor flap motor moves to the F1 position.
• Electronic control valve opens fully. (480 steps)
• Even if the remote control unit is not connected, the indoor unit operates independently.
(14)-2. Shorting CK.L or CK.H pin of the outdoor PCB
● When shorting the cooling pin (CN8) with normal operation
• Relay RY3 is turned ON for 3 seconds ➞ The outdoor fan motor operates at the “LL” fan speed.
• Relay RY4 is turned ON for 3 seconds ➞ The outdoor fan motor oprates at the “H” fan speed.
• Turn ON relay RY2 under the above condition ➞ The magnet switch (52C) turns ON.
It will take about 18 seconds before cooling operation begins.
● Shorting the heating pin (CN9) with normal operation
• Relays RY3 and RY4 are turned ON for 3 seconds ➞ The outdoor fan motor operates at the “H” fan speed.
• Relay RY3 is turned ON for 3 seconds ➞ The outdoor fan motor operates at the “LL” fan speed.
• Turn ON relay RY2 under the above conditions ➞ The magnet switch (52C) turns ON. If relay RY1 is
turned ON, the 4-way valve (20S) turns ON.
It will take about 18 seconds before heating operation begins.
• The outdoor unit operates independently regardless of the indoor unit’s operation. However, the outdoor unit
does not defrost.
• The indoor and outdoor units stop when the outdoor protection apparatus activates during the checking
operation, and automatically restarts, unlike in normal operation.
NOTE
NOTE
NOTE