12 | Commissioning
Installer reference guide
58
2MXM40+50A
R32 Split series
4P600463-4E – 2021.12
12.5 Trial operation and testing
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 To perform a test run
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 15°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.
▪ During cooling operation, frost may form on the gas stop valve or other parts.
This is normal.
INFORMATION
▪ Even if the unit is turned OFF, it consumes electricity.
▪ When the power turns back on after a power break, the previously selected
mode will be resumed.
12.6 Starting up the outdoor unit
See the indoor unit installation manual for configuration and commissioning of the
system.
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