Page 47 mrcool.com
Refrigerant Piping Connection
Test Run Instructions
Test Run
10
The Test Run should be performed for at least 30
minutes.
1. Connect power to the unit. Then, turn on the
main power switch and allow the unit to warm up.
2. Press the ON/OFF button on the remote
controller to turn on the system.
3. Press the MODE button to scroll through the
following functions, one at a time:
• COOL - Select the lowest possible temperature
• HEAT - Select the highest possible temperature
4. Let each function run for 5 minutes and then
perform all of the system checks listed in the
table to the right.
5. After the Test Run has been successfully
completed, and you confirm that the system has
PASSED all of items on the checklist, perform the
following tasks:
a. Using the remote control, return the unit to a
normal operating temperature.
b. Using insulation tape, wrap the indoor
refrigerant pipe connections that were left
uncovered during the indoor unit installation
process.
Failure to perform the test run could result in
damage to the unit, property, or personal injury.
Only perform test run after you have ensure the
following steps have been completed:
• Electrical Safety Checks - Confirm that the
unit’s electrical system is safe and operating
properly.
• Gas Leak Checks - Check all refrigerant
piping/line set connections and confirm that
the system is not leaking.
• Confirm that the gas and liquid (high and low
pressure) stop valves are fully open. If the
valves are not fully opened before the
system is turned on, damage could occur.
WARNING
NOTE: If the unit malfunctions or does not
operate correctly, please refer to the
Troubleshooting section of this manual
before contacting technical support.
Before Test Run
DOUBLE-CHECK PIPE CONNECTIONS
During operation, the pressure of the refrigerant
circuit/piping will increase. This may reveal leaks
that were not present during your initial leak
check. Take time during the Test Run to
double check that all refrigerant pipe connection
points do not have leaks. Refer to the Electrical
& Gas Leak Checks section for instructions.
List of Checks to Perform PASS/FAIL
No electrical leakage
Unit is properly grounded
All electrical terminals
securely connected
& covered
Indoor and outdoor units
are securely installed
All pipe connection
points do not leak
Outdoor: Indoor:
Water drains properly
from drain hose
All piping is properly
insulated
Unit operates in COOL
mode properly
Unit operates in HEAT
mode properly
Indoor unit louvers
rotate properly
Indoor unit responds to
remote controller
Test Run Checklist
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