Refrigerant Shortage - Daikin K-Series Service Manual

SiBE061121.book Page 113 Monday, April 25, 2011 3:21 PM
SiBE061121

4.25 Refrigerant Shortage

U0
Remote
Controller
Display
Method of Refrigerant shortage detection I:
Refrigerant shortage is detected by checking the input current value and the compressor
Malfunction
running frequency. If the refrigerant is short, the input current is lower than the normal value.
Detection
Refrigerant shortage detection II:
Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of
the outdoor electronic expansion valve. If the refrigerant is short, the discharge pipe
temperature tends to rise.
Refrigerant shortage detection III:
Refrigerant shortage is detected by checking the difference between suction and discharge
temperature.
Malfunction Refrigerant shortage detection I:
The following conditions continue for 7 minutes.
Decision
Conditions
<25/35 class>
25/35 class
<50 class>
50 class
Refrigerant shortage detection II :
The following conditions continue for 80 seconds.
25/35 class
50 class
Service Diagnosis
≤
Input current × input voltage A × output frequency + B
Output frequency > C
A
(–)
640/256
≤
Input current D × output frequency + E
Output frequency > F
D
(–)
18/1000
Opening of the outdoor electronic expansion valve ≥ G
Discharge pipe temperature > H × target discharge pipe temperature + J
G (pulse)
480
480
C (Hz)
B (W)
0 55
E F
(A) (Hz)
0.7 55
H (–) J (°C)
128/128 30
128/128 cooling: 20, heating: 45
Troubleshooting
113