Daikin SkyAir GQI-Eco Series Service Manual page 102

Skyair gqi-eco rzqg71~140lv1b series heat pump r-410a 50hz
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Symptom-based Troubleshooting
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Measure the temperature of suction
air and discharge air. Temperature
difference = Suction air temp. –
Discharge air temp.
Temperature
difference for cooling should be
between 8 and 18˚C.
NO
Does
any frost
generate around inlet
port of indoor unit heat exchanger
or outlet port of electronic
expansion
valve?
NO
Does indoor unit
airflow rate down?
NO
Is the
level of high pressure higher
than normal level?
NO
Possible causes as follows
* Insufficient compression of
compressor
* Insufficient circulation of refrigerant
* Defective electronic expansion valve
92
Does the heat
YES
load increase after installation
of the unit?
NO
Possible causes as follows
* Incorrect selection of model
* Affection of direct sun
Is the
YES
operation current less than
specified level?
NO
Refrigerant shortage possibly
generates trouble.
* Clogged air filter
YES
* Soiled heat exchanger
* Defective fan motor
(Refer to troubleshooting "
Possible causes as follows
* Refrigerant overcharge
* Air in refrigerant system
YES
* Soiled heat exchanger
* Short circuit of supply air
* Disturbing item in airflow
* Defective fan motor of outdoor unit
(Refer to troubleshooting "
YES
Normal.
Additional unit installation
should be considered.
YES
After vacuum drying, charge
correct amount of refrigerant.
Check the each section.
A6
".)
Check the each item.
E7
".)
Check the each item.
SiBE281013
Service Diagnosis

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