About Cool Mode Lock; Commissioning; Checklist Before Commissioning; Checklist During Commissioning - Daikin 4MXM-N9 Installation Manual

4.6.6

About cool mode lock

Cool mode lock limits the unit to cool operation. Forced operation
remains possible in cool mode.
Specifications for the connector housing and pins: ST products,
housing VHR‑5N, pin SVH‑21T‑1,1
When cool mode lock is used in combination with the Hybrid for
Multi, these units will not operate by the heat pump.
To turn on cool mode lock
1 Short-circuit pins 3 and 5 of connector S15.
4×
5

Commissioning

NOTICE
ALWAYS operate the unit with thermistors and/or pressure
sensors/switches. If NOT, burning of the compressor might
be the result.
5.1

Checklist before commissioning

After the installation of the unit, first check the items listed below.
Once all checks are fulfilled, the unit must be closed. Power-up the
unit after it is closed.
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.
3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
3P600450-1C – 2020.05
S15
VHR-5N
SVH-21T-1
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.
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~E) on the wiring and piping
match for each indoor unit.
Check if the priority room setting is set for 2 or more
rooms. Keep in mind that the DHW generator for Multi or
the Hybrid for Multi shall not be selected as the priority
room.
5.2

Checklist during commissioning

To perform a wiring check.
To perform an air purge.
To perform a test run.
5.3

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.
5.3.1

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 3 minutes 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 72 hours.
During this time, the gas boiler will take over the hybrid
operation.
1 Remove the service PCB switch cover.
5 Commissioning
Installation manual
13