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90 Outdoor Unit
Test Run
1
2
3
4
Check to see whether there is any refrigerant leakage, and slack of power or communication cable.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground.
Do not operate in the case of 2.0 MΩ or less.
NOTE: Never carry out megaohm check over terminal control board. Otherwise the control board
would be broken.
Immediately after mounting the unit or after leaving it turned off for an extended length of time,
the resistance of the insulation between the power supply terminal board and the ground may
decrease to approx. 2.0 MΩ as a result of refrigerant accumulating in the internal compressor.
If the insulation resistance is less than 2.0 MΩ, turning on the main power supply and
energizing the crankcase heater for more than 6 hours will cause the refrigerant to evaporate,
increasing the insulation resistance.
Check if high/low pressure common pipe, liquid pipe and gas pipe valves are fully opened.
NOTE: Be sure to tighten caps.
Check if there are any problems in automatic addressing or not:
Check and confirm that there are no error messages in the display of indoor units or remote controls
and LED in outdoor units.
CAUTION
when applying main power of the Multi V
• Always apply main power of the outdoor unit during use of product
(cooling season/heating season).
• Always apply power 6 hours in advance to heat the crank case heater where performing test run
after installation of product. It may result in burning out of the compressor if not pre-heat the
crank case with the electrical heater for more than 6 hours.(In case of the outdoor temperatue
below 10℃(50℉))
Functions of each Test run steps
Step 0. Verify the command signals
Select function to be executed during the test run
Step 1. Examine Sensor
Examine the normal operations of the sensors attached to the outdoor/indoor units
Step 2. Refrigerant Automatic Recharge
If additional bottling of the refrigerant is needed, operate to perform this automatically.
Step 3. Automatic Refrigerant Decisions
Inspect if the bottled refrigerant in the system has adequate quantity.
Step 4. Integrated Test Run
Process to verify the normal operations of the parts attached to the system, and verify normal operation of the sys-
tem.
Step 5. Real-time sensor checking
Check the sensors while operating in real-time.
❈
Gas pipes and Liquid pipes connections inspection
: Inspect whether the gas pipes and Liquid pipes are connected to each other.
Test Run
Checks Before Test Run
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