Checking The Indoor And Outdoor Units - Sanyo XHS1271 Technical & Service Manual

(2) If the self-diagnostics function fails to operate
Check the indoor unit.
Replace the controller.

9-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit
No. Control
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 3 indicator
lamps on the unit. If all 3 are blinking,
the current mode is "TEST run."
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
1 Apply the rated voltage between outdoor
unit terminals L and N.
2 Short-circuit the outdoor unit COM terminal
to the T-RUN terminal.
If there are no problems with the above, then check the indoor unit.
Using the 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).
Is the fuse blown?
Normal
• No indicators illuminate and the
indoor fan does not rotate.
• Check the power voltage.
Blown
Replace the circuit
board or the fuse.
Check items (unit operation)
•
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.
Check items (unit operation)
•
The control panel LED (red) must illuminate.
• The compressor, fan motor and 4-way valve must all turn on.
52
TEST/T-RUN terminals
(TEST)/MV T-RUN COM