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Trial Operation and Testing
2.
Trial operation and testing
1) To test cooling, set for the lowest temperature. To test heating, set for the highest temperature. (Depending on the room
temperature, only heating or cooling (but not both) may be possible.)
2) After the unit is stopped, it will not start again (heating or cooling) for approximately 3 minutes.
3) During the test run, first check the operation of each unit individually. Then also check the simultaneous operation of
all indoor units.
Check both heating and cooling operation.
4) After running the unit for approximately 20 minutes, measure the temperatures at the indoor unit inlet and outlet. If the
measurements are above the values shown in the table below, then they are normal.
(When running in one room)
5) During cooling operation, frost may form on the gas stop valve or other parts. This is normal.
6) Operate the indoor units in accordance with the included operation manual. Check that they operate normally.
3.
Items to check
ATTENTION
• Have the customer actually operate the unit while looking at the manual included with the indoor unit. Instruct the customer
how to operate the unit correctly (particularly cleaning of the air filters, operation procedures, and temperature adjustment).
• Even when the air conditioner is not operating, it consumes some electric power. If the customer is not going to use the unit
soon after it is installed, turn off the breaker to avoid wasting electricity.
• If additional refrigerant has been charged because of long piping, list the amount added on the nameplate on the reverse side
of the stop valve cover.
Cooling
Heating
Temperature difference
between inlet and outlet
Approx. 8
°
C
Approx. 20
°
C
Check item
Consequences of trouble
Check
Are the indoor units installed securely?
Falling, vibration, noise
Has an inspection been made to check for gas leakage?
No cooling, no heating
Has complete thermal insulation been done (gas pipes, liquid
pipes, indoor portions of the drain hose extension)?
Water leakage
Is the drainage secure?
Water leakage
Are the ground wire connections secure?
Danger in the event of a ground fault
Are the electric wires connected correctly?
No cooling, no heating
Is the wiring in accordance with the specifications?
Operation failure, burning
Are the inlets/outlets of the indoor and outdoor units free of any
obstructions?
No cooling, no heating
Are the stop valves open?
No cooling, no heating
Do the marks match on the wiring and piping for each indoor
unit?
No cooling, no heating
Is the priority room setting set for 2 or more rooms?
The priority room setting will not func-
tion.
