Sanyo CH1872, CH2472 service manual Checking the Indoor and Outdoor Units

9-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

No.	Control	Check items (unit operation)
1	Use the remote controller to operate the	• The rated voltage must be present between inter-unit wirings 1 and 2.
	unit in "TEST run" mode. To determine	• Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the
	whether the mode is currently in	voltage at both ends is measured, approximately 12 to 15V DC must
	"TEST run" mode, check the 4 indicator	be output and the multimeter pointer must bounce once every 8
	lamps on the unit. If all 4 are blinking,	seconds.
	the current mode is "TEST run."	Or instead of measuring the voltage, you can insert an LED jig and
		check that the LED flickers once every 8 seconds.
If there are no problems with the above, then check the outdoor unit.
For the "Test run" procedure, refer to the Appendix B "Installation Instructions".
(2) Checking the outdoor unit
No.	Control	Check items (unit operation)
1 Apply the rated voltage between outdoor		• The control panel LED (red) must illuminate.
	unit terminals L and N.

2Short-circuit the outdoor unit COM terminal • The compressor, fan motor and 4-way valve must all turn on. to the T-RUN terminal.

If there are no problems with the above, then check the indoor unit.

Using the TEST/T-RUN terminals		TEST/T-RUN terminals
T-RUN : Test run (compressor and fan motor turn ON).
TEST/MV : Compresses time to 1/60th (accelerates
operation by 60 times faster than normal).
	(TEST)/MV		T-RUN	COM

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