Daikin RMXS-L Series User Manual

SiUS181631EA Troubleshooting for Outdoor Unit
Troubleshooting 263
7.33 Check for Outdoor Unit
7.33.1 Check for Causes of Rise in High Pressure
Check No.30 Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points.
A temperature
difference in excess of
10°C (18°F) between
the inlet and the outlet
is deemed to be
abnormal.
Short-circuit
Rise in high
pressure
Local
pressure
rise
High pipe
resistance
Stop valve closed
Bent or crashed pipe
Clogging of foreign
particles
←Check to be sure the stop valve is open.
←Conduct visual checks for pipe conditions.
←Is there any temperature difference caused
before and after the filter or branch pipe?
If the outdoor unit
electronic
expansion valve is
throttled: (See ∗1.)
Faulty outdoor
unit electronic
expansion valve
Faulty valve coil
Faulty valve body
←Are the coil resistance and insulation normal?
Faulty
control
Faulty high pressure
sensor
Faulty control PCB
←Are the electrical characteristics normal?
←Is the pressure value checked with the
Service Checker corresponding to the
measurement of the pressure sensor?
Faulty
high
pressure
control
In cooling
High suction
air
temperature
of the
condenser
In heating
High suction air
temperature
of outdoor unit
Short-circuit
High ambient
temperature
←Is the suction air temperature not more than
46°C (114.8°F)?
←Is the outdoor temperature not more than
46°C (114.8°F)?
High suction
air temperature
of indoor unit
High ambient
temperature
←Is the suction air temperature not more than
27°C (80.6°F)?
←Is the indoor temperature not more than
27°C (80.6°F)?
Faulty suction air thermistor of indoor unit
High suction air temperature of outdoor unit
Faulty outdoor temperature thermistor of outdoor unit
← Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the outdoor temperature not more than
16°CWB (60.8°FWB)?
←
Is the connector properly connected?
Are the thermistor resistance characteristics normal?
Dirty condenser
Mixing of non-condensable gas
←Is the heat exchanger clogged? (In cooling)
←Is air or else mixed in the refrigerant system?
Decreased
fan airflow
rate
← Can the fan motor be rotated with hands?
Are the motor coil resistance and
insulation normal?
←If a spare PCB is mounted, is the capacity
setting properly made?
Faulty control
PCB
(Including
capacity setting)
High air
passage
resistance
Dirty filter
←Is the air filter clogged?
Obstacle
←Is there any obstacle in the air passage?
Excessive refrigerant charging
Improper model selection
In heating
←Refer to troubleshooting
F6.
←Is the indoor unit too small compared to
the large-sized outdoor unit?
∗1:
In cooling, it is normal if the outdoor unit electronic expansion valve (Y1E) is fully open.
(R19097)
Degradation
in condensing
capacity
Decreased
fan
output
Faulty fan
motor

Daikin RMXS-L Series Specifications

General

Brand	Daikin
Model	RMXS-L Series
Category	Heat Pump
Language	English