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Post Installation Checks
Test Run Instructions
Preparation before connecting the power:
1. DO NOT connect the power if the installation work is not completed.
2. Ensure control circuit is correct and all the wires are firmly connected.
3. Ensure cut-off valves of the gas pipe and liquid pipe are open.
4. The inside of the unit should be clean. Take irrelevant objects out if there are any.
5. After performing these checks, reinstall the front side plate.
Operation after connecting the power:
1. If all the above checks have been completed, power on the unit.
2. Make sure the unit runs normally.
3. If the outside temperature is more than 86°F (30°C), heating mode cannot be enabled.
4. If there are any loud and/or abnormal sounds contact MRCOOL
®
Tech Support immediately.
NOTICE:
1. If you use the thermostat to turn off the unit and then immediately turn the unit on again, the compressor
will need 3 minutes to restart. Even if you press “ON/OFF” button on the thermostat, it will not start up right
away.
2. If there is no display on the temperature thermostat, it is probably because the connection wires between
the unit and the temperature thermostat are not connected. Connect the connection wires, and recheck the
display.
DOUBLE-CHECK PIPE CONNECTIONS
During operation, the pressure of the refrigerant circuit will increase. This may reveal leaks
that were not present during your initial leak check. Take time during the Test Run to dou-
ble-check that all refrigerant pipe connection points do not have leaks.
Test Run
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