37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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SAFETY AND LEAKAGE CHECK
Electrical Safety Check
Perform the electrical safety check after completing installation. Cover
the following areas:
1. Insulated resistance: The insulated resistance must be more than
2M.
2. Grounding work: After finishing grounding work, measure the
grounding resistance by visual detection and using the grounding
resistance tester. Make sure the grounding resistance is less than 4.
3. Electrical leakage check (performing during test while unit is on):
During a test operation after completed installation, the use the
electroprobe and multimeter to perform an electrical leakage check.
Turn off the unit immediately if leakage happens. Try and evaluate
different solutions until the unit operates properly.
Gas Leak Check
1. Soap water method: Apply a soap-water solution or a liquid neutral
detergent on the indoor unit connection or outdoor unit connections
with a soft brush to check for leakage of the connecting points of the
piping. If bubbles emerge, the pipes are experiencing leakage.
2. Leak detector: Use the leak detector to check for leakage.
F. TEST RUN
Before Test Run
A test run must be performed after the entire system has been completely
installed. Confirm the following points before performing the test:
a. The indoor and outdoor units are properly installed.
b. Piping and wiring are properly connected.
c. No obstacles near the inlet and outlet of the unit that might
cause poor performance or product malfunction.
d. The refrigeration system does not leak.
e. Drainage system is unimpeded and draining to a safe location.
f. The heating insulation is properly installed.
g. The grounding wires are properly connected.
h. Length of the piping and additional refrigerant stow capacity
have been recorded.
i. The power voltage is the correct voltage for the air conditioner.
Test Run Instructions
1. Open both the liquid and gas stop valves.
2. Turn on the main power switch and allow the unit to warm up.
3. Set the air conditioner to COOL mode.
4. For the Indoor Unit
a. Ensure the remote control and its buttons work properly.
b. Ensure the louvers move properly and can be changed using
the remote control.
c. Double check to see if the room temperature is being
registered correctly.
d. Ensure the indicators on the remote control and the display
panel on the indoor unit work properly.
e. Ensure the manual buttons on the indoor unit works properly.
f. Check to see that the drainage system is unimpeded and
draining smoothly.
g. Ensure there is no vibration or abnormal noise during
operation.
5. For the Outdoor Unit
a. Check to see if the refrigeration system is leaking.
b. Make sure there is no vibration or abnormal noise during
operation.
c. Ensure the wind, noise, and water generated by the unit do not
disturb your neighbors or pose a safety hazard.
NOTE: If the unit malfunctions or does not operate according to
your expectations, refer to the Troubleshooting section of
the Owner’s Manual before calling customer service.
Function of Automatic Wiring/Piping Correction
More recent models now feature automatic correction of wiring/piping er-
rors. Press the "check switch" on the outdoor unit PCB board for 5 sec-
onds until the LED displays "CE”, indicating that this function is work-
ing, Approximately 5-10 minutes after the switch is pressed, the "CE"
disappears, meaning that the wiring/piping error is corrected and all wir-
ing/piping is properly connected.
How to Activate this Function
1. Check that outside temperature is above 41°F (5°C).
(This function does not work when outside temperature is not above
41°F (5°C)
2. Check that the stop valves of the liquid pipe and gas pipe are open.
3. Turn on the breaker and wait at least 2 minutes.
4. Press the check switch on the outdoor PCB board unit LED display
"CE".
Failure to perform the test run may result in unit damage, property
damage, or personal injury.
CAUTION
Correct
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Incorrect wiring
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Incorrect Refrigrant Piping
Terminal
block
Liquid/
Gas pipe
Outdoor unit
Indoor unit B
Indoor unit A
B
A
B
A
Check switch
LED display
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