English 22
Trial operation and testing
3. 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) When trial operation is conducted in the HEAT operation directly after the circuit breaker is turned on, in some cases no air
will be output for about 15 minutes in order to protect the air conditioner.
4) 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.
5) 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.
• During the test run operation only air conditioner indoor units shall be operate (The DHW generator for Multi or the Hybrid
for multi shall be OFF during the test run operation).
(When running in one room)
6) During cooling operation, frost may form on the gas stop valve or other parts. This is normal.
7) Operate the indoor units in accordance with the included operation manual. Check that they operate normally.
4. Items to check
• 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? Incomplete cooling/heating function
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? Electrical leakage
Are the electric wires connected correctly? Incomplete cooling/heating function
Is the wiring in accordance with the specifications? No operation or burn damage
Are the inlets/outlets of the indoor and outdoor units free of any
obstructions?
Incomplete cooling/heating function
Are the stop valves open? Incomplete cooling/heating function
Do the marks match (room A, room B, room C, room D, room E)
on the wiring and piping for each indoor unit?
Incomplete cooling/heating function
Is the priority room setting set for 2 or more rooms? (The DHW
generator for Multi or the Hybrid for Multi shall not be selected
as the priority room.)
The priority room setting will not function.
3PEN417620-3N.book Page 22 Friday, June 21, 2019 9:50 AM
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