12 | Commissioning
Installer reference guide
63
2MXM-A, 3MXM-A, 4MXM-A, 5MXM-A
R32 Split series
4P600463-5E – 2021.12
12.5 Trial operation and testing
For the Hybrid for Multi, certain precautions are required before using this
function. For more information, see the indoor unit installation manual and/or the
indoor installer reference guide.
Before starting the test run, measure the voltage at the primary side of the safety breaker.
The piping and wiring work match.
The stop valves (gas and liquid) on the outdoor unit are fully open.
Initialization of the Multi system can take several minutes depending on the
number of indoor units and options used.
12.5.1 About wiring error check
The wiring error check function will check and automatically correct any wiring
errors. This is useful for checking wiring that CANNOT be checked directly, such as
underground wiring.
This function CANNOT be used within 3minutes after activating the safety breaker
or when the outside air temperature is ≤5°C.
To perform a wiring error check
INFORMATION
▪ You only have to perform a wiring error check if you are not sure that the
electrical wiring and piping is connected correctly.
▪ If you perform a wiring error check, the hybrid for multi indoor unit will not
operate by heat pump for 72hours. During this time, the gas boiler will take over
the hybrid operation.
1 Remove the service PCB switch cover.
2 Press shortly the wiring error check switch (SW3) on the outdoor unit service
PCB.
Result: The service monitor LEDs indicate whether correction is possible or
not. For details about how to read the LED display, refer to the service
manual.
Result: Wiring errors will be corrected after 15-20minutes. If automatic correction
is not possible, check the indoor unit wiring and piping in the usual way.
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