Doosan DA40 - Preassure reading and troubleshooting

Ch 6 page 31
ELECTRICAL SYSTEM
SHOP MANUAL
After 3 minutes
LP 2,5bar
HP 21bar
Compressor
ON
The condenser is
partially clogged
Clean con-
denser
Preassure reading and troubleshooting
HP to high (level 1)
After 3 minutes
LP 0bar
HP 8bar
Compressor
short cycle
System insuffi-
cient charged
1. Recover
and recycle
refrigerant
2. Recharge
correct quan-
tity
Leak on circuit
After 3 minutes
LP from 3,5bar
HP from 23bar
compressor
OFF
Circuit excessive
charged
1. recovery
and recycle
refrigerant
2. Recharge
correct quan-
tity.
After 15 min-
utes
LP 4,5bar
HP from 23bar
Compressor
OFF
Condenser fan
out of order
Check con-
denser fan
After 3 minutes
LP -1bar
HP 8bar
Compressor
OFF
Thermostatic
expansion valve
blocked
1. Clean the
circuit
2. Change
filter receiver
and drier
3. Install new
thermostatic
expansion
valve
Circuit blocked
Water inside
circuit
Filter reciever
saturated or
blocked
1. Search for
the impurity
and remove it.
Solid impurity
inside circuit(hose
plug protection
forgotten
HP to high (level 2)
HP to high (level 3)
Low charged circuit
Compressor short cycle on
Compressor short cycle on
Blocked circuit