CIAT EREBA ACCESS 17-40 T/HT, Instruction Manual

Page: 23 / 130

EN
EN - 21 EREBA ACCESS 17 - 40 T/HT
There follows a list of failures which might occur and their possible
causes and repairs.
In case the unit is not working properly, disconnect it from the mains
before trying to repair it.
Defect Possible Cause S
uggeSted repair
The unit does not start :
- Power supply disconnected;
connect power supply
.
- Main switch is cut-out;
cut
-
in the main switch
.
- Supply voltage too low;
check supply voltage
.
- Triggering of a protection device;
reset the protection device
.
- Blocked contactor;
check and replace the blocked contactor if necessary
.
- Seizing of compressor;
check and replace compressor if necessary
.
- Loose electric connections;
check and tighten the electric connections
.
The unit works continuously or cycles too often:
- Failure of compressor contactor;
check and replace contactor if necessary
.
- Compressor failure;
check and replace compressor if necessary
.
- Refrigerant leak;
check the charge and add more refrigerant
.
- Water flow is insufficient;
check pressure loss in the water circuit.
- Static pressure in water circuit is insufficient;
check it on the pressure gauge and restore it if necessary.
The unit stops because of low pressure alarm:
- Refrigerant leak;
check the charge and add more refrigerant
.
- Water flow in the heat exchanger is insufficient;
check the water pump
.
- Unit starting delay;
wai t until the system is stable
.
The unit stops because of high pressure alarm:
- Failure of high pressure switch;
check and replace pressure swi tch if necessary
.
- The expansion valve is blocked;
check and replace the expansion valve if necessary
.
- Dehydrating filter clogged;
check and replace filter if necessary
.
- Outdoor fan/s not working;
check the fans
/
s motor
/
s and its electric connections
.
-
Coil clogged or dirty;
remove clogging or clean the coil.
The unit is too noisy:
- Piping vibration;
fix the pipes properly
.
- The compressor is too noisy;
check and replace compressor if necessary
.
- The expansion valve blows;
check the charge and add refrigerant if necessary
.
- Panels are not installed correctly;
install the panels properly
.
Oil leak from the compressor:
- Leaks from the refrigerant circuit;
find and repair leaks
.
Water leaks:
- Defects at inlet and/or outlet water connections;
check and tighten connections if necessary
.
The defrost system of the unit is not working (only on units EREBA
ACCESS HT):
- Failure of 4-way backflow valve;
check and replace valve if necessary
.
- Defrost probe is not working;
check and replace probe if necessary
.
13 - TROUBLESHOOTING