English
17
Trial Operation and Testing
• Before starting the test run, measure the voltage at the primary side of the safety breaker.
• Check that all liquid and gas stop valves are fully open.
• Check that piping and wiring all match.
• Initialization of the Multi system can take several minutes depending on the number of indoor units and options used.
1.
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.
2.
Fault diagnosis by LED on outdoor unit PCB.
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. 15
°
C
Diagnosis
LED is flashing
Normal -> check the indoor unit
LED is ON
Turn the power OFF and then ON again.
If the LED display recurs, the outdoor unit PCB is faulty.
LED is OFF
Power supply fault or turn the power OFF and then ON again.
If the LED display recurs, the outdoor unit PCB is faulty.
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 (room A, room B) on the wiring and piping
for each indoor unit?
No cooling, no heating
3PEN423316-2K.book Page 17 Monday, May 15, 2017 1:15 PM
