Outdoor Unit; 4-Way Valve - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting

2.4.2. Outdoor unit

2.4.2.1. 4-way valve

Technical specification
-
Location
Piping diagram
See "Outdoor unit" on
page 104.
Check procedure
Mechanical check
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required.
PROCEDURE
1. Loosen the screw and remove the coil from the 4-way valve (refer to
W : R
ARNING
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
2. Unplug 4-way valve connector from applicable PCB, see table
3. Switch on the Daikin unit via the user interface, start cooling/defrost operation.
If the temperature after the heat exchanger drops, proceed with next step.
If the temperature after the heat exchanger rises, the 4-way valve is stuck in heating position, replace the 4-way valve body
(refer to "Replacing 4-way valve body" on page
If the temperature after the heat exchanger does not rise, check the refrigerant pressure by connecting a manifold to one of
the service ports.
- If no pressure is measured, perform a pressure test and fix any leaks.
- If pressure is measured, the 4-way valve is stuck in the middle, confirm by determining the position of the 4-way valve as
described below and replace the 4-way valve (refer to
C - R
AUTION
To prevent damage to the compressor the step below must only be done once.
4. While listening to the 4-way valve, place a round permanent magnet on the core of the solenoid valve. If you do not hear the
4-way valve switching, it must be replaced (refer to
Electrical check
PRELIMINARY ACTIONS
1. Switch off Daikin unit via the user interface.
4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
Wiring diagram
See "Outdoor unit" on
page 99.
F
ISK OF IRE
73).
ISK OF LIQUID ENTERING THE COMPRESSOR
"Replacing 4-way valve body" on page
Description
The 4-way valve directs the super heated refrigerant discharged
from the compressor to the indoor heat exchanger in case of heat-
ing operation or to the outdoor heat exchanger in case of defrost-
ing and cooling operation.
Switch box
See "Outdoor unit" on
page 111.
"Replacing 4-way valve coil" on page
"Component checklist" on page
"Replacing 4-way valve body" on page
2.4. Component checklist
Component overview of unit
See "Outdoor unit" on page 110.
75).
111.
73).
73).
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