C Test Run; Before Test Run; Test Run Procedures - Mitsubishi Electric PRH-P8MYA Technical & Service Manual

Air-cooled rooftop packaged air conditioners
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C
Test run
[1]

Before test run

The test run can be carried out either from the unit or remote controller.
1. Check list
• After wiring of units are complete, check that refrigerant is not leaking, the power and control wires are not loose,
and the poles are not reversed.
• Use a 500 V insulation resistance tester to make sure that the resistance between the power terminal and the
ground is 1.0 MΩ or more. If it is less than 1.0 MΩ, do not operate the unit.
• Make sure there is no malfunction in the unit. (If there is a malfunction, you can diagnose it using LED1 on the
outdoor-side controller board.)
• Check the electrical power phase. If the phase is reversed, the fan may rotate in the wrong direction or stop, or
unusual sounds may be produced.
• Starting at least 12 hours before the test run, send current through the crankcase heater. (If the current is running
for a shorter period of time, damage to the compressor could result.)
• For specific models requiring changing of settings for selection of power supply ON/OFF capability, make proper
changes referring to the description for Selection of Functions through Remote Controller.
After the above checks are complete, carry out the test run as indicated in the following outline.
[2]

Test run procedures

1. Remote controller
Operating procedures
(1) Turn on the main power supply
While the room temperature display on the remote controller reads "CENTRALLY CONTROLLED", the remote
controller is disabled. Turn off the "CENTRALLY CONTROLLED" display before using the remote controller.
(2) Press "TEST RUN" button twice
(A) The "TEST RUN" indicator should light up.
(3) Press
Cooling mode: Cool air should start to blow.
Heating mode: Warm air should start to blow (after a while).
(4) Press
button
Check for correct motion of auto-vanes.
(5) Check the outdoor-side fan for correct running
The unit features automatic capacity control to provide optimum outdoor-side fan speeds. The fan keeps running
at a low speed to meet the current outside air condition unless it exceeds its available maximum power. Then, in
actuality, the fan may stop or run in the reverse direction depending on the outside air, which does not mean
malfunction.
CENTRALLY CONTROLLED
ON OFF
CLOCK
CHECK
ßC
STAND BY
ERROR CODE
DEFROST
TEMP.
TIMER SET
PAR-20MAA
(3)
button
1Hr.
ßC
FILTER
CHECK MODE
TEST RUN
NOT AVAILABLE
FUNCTION
ON/OFF
FILTER
CHECK TEST
- 70 -
(A)
(5)
(2)

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