Installation Manual

Page 30mrcool.com
Refrigerant Piping Connection
AFTER PERFORMING GAS LEAK CHECKS
After confirming that the all pipe connection
points DO NOT leak, replace the valve cover
on the outside unit.
Electrical and Gas Leak Checks
8
Gas Leak Checks
WARNING – RISK OF
ELECTRIC SHOCK
ALL WIRING MUST COMPLY WITH LOCAL
AND NATIONAL ELECTRICAL CODES, AND
MUST BE INSTALLED BY A LICENSED
ELECTRICIAN.
Electrical Safety Checks
BEFORE TEST RUN
DURING TEST RUN
After installation, confirm that all electrical wiring is
installed in accordance with local and national
regulations, and according to the Installation Manual.
Check Grounding Work
Measure grounding resistance by visual detection
and with grounding resistance tester. Grounding
resistance must be less than 4.
Note: This may not be required for some locations
in the US.
Check for Electrical Leakage
During the Test Run, use an electro-probe and
multimeter to perform a comprehensive electrical
leakage test.
If electrical leakage is detected, turn off the unit
immediately and call a licensed electrician to find
and resolve the cause of the leakage.
Note: This may not be required for some locations
in the US.
There are two different methods to check for
gaseous leaks.
Soap and Water Method
Using a soft brush, apply soapy water or liquid
detergent to all pipe connection points on the
indoor unit and outdoor unit. The presence of
bubbles indicates a leak.
Leak Detector Method
If using leak detector, refer to the device’s operation
manual for proper usage instructions.
8
Electrical and Gas Leak Checks
A: Low pressure stop valve
B: High pressure stop valve
C&D: Indoor unit flare nuts
Check-point of indoor unit
Check-point of outdoor unit
A
B
C
D