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Section
SM830082
IV - 45
SM830082
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.
• 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 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