18
■
English
2.
Trial operation and testing
•
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.)
•
After the unit is stopped, it will not start again (heating or cooling) for about 3 minutes.
• 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.
•
After running the unit for about 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.
Temperature difference between
inlet and outlet
About 14°F (8°C)
Cooling
About 36°F (20°C)
Heating
(When running in one room)
•
During cooling operation, frost may form on the gas stop valve or other parts. This is normal.
•
Operate the indoor units in accordance with the included operation manual. Check that they operate normally.
3.
Test items
Are the indoor units installed securely?
Has an inspection been made to check for gas leakage?
Has complete thermal insulation been done (gas pipes, liquid
pipes, indoor portions of the drain hose extension)?
Is the drainage secure?
Are the ground wire connections secure?
Are the electric wires connected correctly?
Is the wiring in accordance with the specifications?
Are the inlets/outlets of the indoor and outdoor units free of any obstructions?
Are the stop valves open?
Do the marks match (room A, room B, room C, room D) on the
wiring and piping for each indoor unit?
Is the priority room setting set for 2 or more rooms?
Test item
Check
Consequences of trouble
Fall, vibration, noise
Incomplete cooling/heating function
Water leakage
Water leakage
Electrical leakage
Incomplete cooling/heating function
No operation or burn damage
Incomplete cooling/heating function
Incomplete cooling/heating function
Incomplete cooling/heating function
The priority room setting will not function.
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 circuit 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.
English
01_EN_3P379970-9C.indd 18
10/17/2019 4:42:20 PM
