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11
Commissioning
NOTICE
General
commissioning
commissioning instructions in this chapter, a general
commissioning checklist is also available on the Daikin
Business Portal (authentication required).
The general commissioning checklist is complementary to
the instructions in this chapter and can be used as a
guideline and reporting template during commissioning and
hand-over to the user.
NOTICE
ALWAYS operate the unit with thermistors and/or pressure
sensors/switches. If NOT, burning of the compressor might
be the result.
11.1
Checklist before commissioning
1 After the installation of the unit, check the items listed below.
2 Close the unit.
3 Power up the unit.
The indoor unit is properly mounted.
The outdoor unit is properly mounted.
The system is properly earthed and the earth terminals
are tightened.
The power supply voltage matches the voltage on the
identification label of the unit.
There are NO loose connections or damaged electrical
components in the switch box.
There are NO damaged components or squeezed
pipes on the inside of the indoor and outdoor units.
There are NO refrigerant leaks.
The refrigerant pipes (gas and liquid) are thermally
insulated.
The correct pipe size is installed and the pipes are
properly insulated.
The stop valves (gas and liquid) on the outdoor unit are
fully open.
Drainage
Make sure drainage flows smoothly.
Possible consequence: Condensate water might drip.
4MWXM-A9
R32 Split series
3P600450-7T – 2022.09
ON
OFF
4
A
3
2
1
1
2
2
4
3
3
2
1
SW5
4
5
checklist.
Next
to
the
The indoor unit receives the signals of the user interface.
The specified wires are used for the interconnection
cable.
The fuses, circuit breakers, or locally installed protection
devices are installed according to this document, and
have NOT been bypassed.
Check if marks (room A~C and TO TANK) on the wiring
and piping match for each connected unit.
Check if the priority room setting is NOT set for 2 or more
rooms. Keep in mind that the DHW tank for Multi shall
NOT be selected as the priority room.
11.2
Checklist during commissioning
To perform a wiring check.
To perform an air purge.
To perform a test run.
11.3
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.
11.3.1
About wiring error check
INFORMATION
This function is available only for the air-conditioning
indoor units. DHW tank wiring MUST be check manually,
automatic correction is NOT possible.
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 3 minutes after activating the
safety breaker or when the outside air temperature is ≤5°C and if
water temperature in DHW tank is ≥20°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.
1 Remove the service PCB switch cover.
11 Commissioning
Installation manual
15