12 | Commissioning
Installer reference guide
61
4MWXM-A
R32 Split series
4P678385-1A – 2022.02
INFORMATION
▪ The number of LEDs displayed depends on the number of rooms.
▪ The wiring error check function will NOT work if outside temperature is ≤5°C and
if water temperature in DHW tank is ≥20°C.
▪ After wiring error check operation is completed, LED indication will continue until
normal operation starts.
▪ Follow the product diagnosis procedures. For details of product error diagnosis
refer to service manual.
Status of LEDs:
▪ All LEDs flash: automatic correction is NOT possible.
▪ LEDs flash alternately: automatic correction is completed.
▪ One or more LEDs are permanently on: abnormal stop (follow the diagnosis
procedure on the back of the right side plate and refer to service manual).
12.5.2 To perform a test run
INFORMATION
For DHW tank test run procedure, refer to installation manual of DHW tank unit.
INFORMATION
If the unit runs into an error during commissioning, see the service manual for the
detailed troubleshooting guidelines.
Prerequisite: Power supply MUST be in the specified range.
Prerequisite: Test run operation may be done in cooling or heating mode.
Prerequisite: Test run should be done in accordance with the operation manual of
the indoor unit to make sure that all functions and parts are working properly.
1 In cooling mode, select the lowest programmable temperature. In heating
mode, select the highest programmable temperature.
2 Measure the temperature at the indoor unit inlet and outlet after running the
unit for about 20minutes. The difference should be more than 8°C (cooling)
or 20°C (heating).
3 First check operation of each unit individually, then check simultaneous
operation of all indoor units. Check both heating and cooling operation.
4 When test run is finished, set the temperature to a normal level. In cooling
mode: 26~28°C, in heating mode: 20~24°C.
INFORMATION
▪ Test run can be disabled if necessary.
▪ After the unit is turned OFF, it cannot be started again for 3 minutes.
▪ When the test run is started in the heat mode right after turning the safety
breaker on, in some cases no air will be output for about 15 minutes in order to
protect the unit.
▪ During cooling operation, frost may form on the gas stop valve or other parts.
This is normal.
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