Komfovent DOMEKT RHP 400 U-2.8/2.4, Инструкция по установке и эксплуатации

Страница: 18 / 36

EN
UAB KOMFOVENT we reserve the right to make changes without prior notice
RHP-C5.1_21-01
18
Troubleshooting of heat pump
No. Message Probable cause
Possible solution
in heating mode
Possible solution
in cooling mode
A1
Compressor failure
Compressor motor, drive
or control system failure. See operation manual.
A2
Overload protection acti-
vated.
The compressor has operated in critical conditions or there is insufficient
refrigerant amount in heat pump hydraulic circuit. Check the working con-
ditions and make sure they are in limits. Low refrigerant level see item C8.
B1
High pressure on com-
pressor
Low air flow. Increase supply air flow. Increase extracted air flow.
B2 Condenser obstructed. Clean condenser surface.
B3
High pressure transducer
failure.
Check pressure in heat pump system with manometers. If pressure
reading does not match, check cable connection or replace transmitter
if necessary.
B4
Incondensable gas in heat
pump hydraulic circuit.
Recharge circuit after having drained and evacuated it.
B5
Refrigerant filter clogged. Check and replace if necessary.
B6
Excessive refrigerant
charge.
Discharge the excess gas.
B7
Expansion valve does not
work properly.
Check and replace if necessary.
C1
Low pressure on com-
pressor
Low air flow. Increase supply air flow. Increase extracted air flow.
C2 Frosted evaporator. See item D1.
C3
Low pressure transducer
failure.
Check pressure in heat pump system with manometers. If pressure
reading does not match, check cable connection or replace transmitter
if necessary.
C4
Evaporator obstructed. Clean evaporator surface.
C5
Expansion valve does not
work properly.
Check and replace if necessary.
C6
Refrigerant filter clogged. Check and replace if necessary.
C7
Moisture in heat pump hy-
draulic circuit.
Replace filter and dry out system.
C8
Low level of refrigerant.
Check circuit with leak detector. Repair, evacuate and refill circuit with
refrigerant.
D1
Evaporator is icing
Defrost solenoid valve
does not open.
Check solenoid valve coil. Check
solenoid valve and replace if ne-
cessary.
D2
Air pressure transducer
failure.
Check air pressure measurement
tubes. Replace air pressure trans-
ducer if necessary.
D3
Evaporator tray heating
element failure.
Check and replace if necessary.
E1
Heat pump does not
start
Too low outdoor tem-
perature.
Heat pump will start operating when
the outside air temperature will be
above -15 °C (approximately).
E2
Low supply or/and ex-
haust air volume.
Set air flow more than in table 1
F1
Heat pump works regu-
lary but with an insuffi-
cient capacity
Low air flow. Increase supply and (or) extracted air flow.
F2 Low level of refrigerant. See C8.
F3
4-way valve failure. Check 4-way valve coil. Check 4-way valve and replace if necessary.
F4
Defrost solenoid valve is
open.
Check solenoid valve coil. Check solenoid valve and replace if necessary.
G1
Frost in compressor suc-
tion line
Expansion valve does not
work properly.
Check and replace if necessary.
G2
Refrigerant filter clogged. Check and replace if necessary.
G3
Evaporator obstructed. Clean evaporator surface.
H1
Abnormal noises in heat
pump system
Components vibrate. Fasten properly.
H2
The compressor is noisy. Replace the compressor.
– the cause must be eliminated only by qualified person.