Gree GVH24AK-K3DNC6A - Pipe and Wire Connections

39
Installation and Maintenance
Service Manual
11
Outdoor discharge
temperature sensor
hasn’t been inserted
tightly
□ ■ □ □
During cooling and drying
operation, compressor stops
operation while indoor fan
operates. During heating
operation, all loads stop
operation.
Outdoor discharge temperature sensor hasn’t been
inserted into the copper pipe.
12
Limit/decrease
frequency due to
overload
■ □
☆ ☆
All loads operate normally,
and operating frequency of
compressor decreases.
Refer to the malfunction analysis (overload, high
temperature resistant)
13
Decrease frequency
due to overcurrent
■ ■ □ ■
All loads operate normally,
and operating frequency of
compressor decreases.
1. The input supply voltage is too low;
2. System pressure is too high and overload
14
Decrease frequency
due to high air
discharge
■ ■ □ □
All loads operate normally,
and operating frequency of
compressor decreases.
1. Overload or temperature is too high;
2. Refrigerant is insufcient;
3. Malfunction of electric expansion valve (EKV) (for
the model with electronic expansion valve);
4. Poor heat exchange of outdoor unit.
15
Limit/decrease
frequency due to
freeze protection
■ ■ ■ □
All loads operate normally,
and operating frequency of
compressor decreases.
1. Poor air return inside indoor unit or speed is too
low;
2. Indoor tube temperature sensor is abnormal
(please refer to the resistance table of 20K
temperature sensor).
16
Decrease
frequency due to
high temperature
resistant under
heating
■ □
☆ ☆
All loads operate normally,
and operating frequency of
compressor decreases.
Refer to malfunction analysis (overload, high
temperature resistant).
17 Defrosting
It operates under heating
mode. Compressor operates
while indoor fan stops
operation.
Normal
18
Overload protection
of compressor
□
☆ ☆
□
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, all
loads stop operation.
1. Wiring terminal OVC-COMP of control board for
outdoor fan is loosened;
2. Overload protector is damaged;
3. Refer to malfunction analysis (discharge
protection, overload)
19 System is abnormal ■ □ ■ ■
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, all
loads stop operation.
Refer to malfunction analysis (overload, high
temperature resistant).
20 IPM protection □
☆
□ ■
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, all
loads stop operation.
Refer to malfunction analysis (IPM protection,
desynchronizing of compressor, overcurrent
protection of phase-current of compressor).
21
Module high
temperature
protection
■ □
☆
■
During cooling operation,
compressor stops while
indoor fan operates. During
heating operation, all loads
stop operation
1. Check whether the ventilation of radiator is
abnormal;
2. After the whole unit is de-energized for 20min,
check whether the thermal grease on IPM modular
of outdoor unit's control board is dry; check whether
the radiator is tightened;
3. Otherwise please replace the control board of
outdoor unit.
22
Circuit failure of
module temperature
sensor
□ □ ■
☆
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, all
loads stop operation.
Replace control board of outdoor unit.