Sanyo 24KHS72 Service Manual - Page 45
Checking the Indoor and Outdoor Units
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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 unit in "TEST run" mode. To determine whether the mode is currently in "TEST run" mode, check the 4 indicator lamps on the unit. If all 4 are blinking, the current mode is "TEST run." • The rated voltage must be present between inter-unit wirings 1 and 2. • Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the voltage at both ends is measured, approximately 12 to 15V DC must be output and the multimeter pointer must bounce once every 8 seconds. 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 unit terminals L and N. • The control panel LED (red) must illuminate. 2 Short-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 45
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