4. Service procedures
(13) TMX60 pins
When shorting TMX60 pins on the indoor and outdoor PCBs, operations shown on the above table will be per- formed on each indoor and outdoor unit. Use TMX60 pins to perform a quick check.
NOTE
• When checking pin operation, stop the indoor and outdoor units with the remote control unit.
■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
It will take about 18 seconds before heating operation begins.
NOTE
•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.
4
SM830082
IV - 45
