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7 - MAINTENANCE
7.1 - Service work
Ensure the following:
■ The water/brine filter system is regularly inspected and cleaned.
■ The water/brine circuit is always vented and the medium quality
is regularly checked and maintained.
■ The system is shut down when cleaning the heat exchanger.
■ If dirty, the heat exchanger is not cleaned with excessively
corrosive chemical cleaning agents, unsuitable tools or
excessively powerful pressure jets.
■ Safety valve
The refrigerant safety valve opens at a defined maximum
pressure that has been calculated for the heat pump. The valve
is generally maintenance-free. After a response, however, a
steady leakage of refrigerant may occur. This results in a loss
of performance and a higher hot gas temperature. In this case,
please contact CARRIER customer service.
■ Integral non-return valve
To protect the compressor against running in reverse (expansion
operation) at standstill, a non-return valve is installed under the
pressure shut-off valve. If the compressor runs in reverse for
more than about 3 seconds after being switched off, this valve
may be faulty and must be replaced. The inspection interval
for the non-return valve is 5000 hours or at least once a year.
■ Roller bearings
If the compressor is operated with less than 4 starts/stops per
hour and always within the application limits, the expected
service life of the roller bearings is 100,000 hours. However, it
is advisable to inspect and (if necessary) replace the
compressor bearings after 40,000 hours. For this purpose, a
separate maintenance request must be sent to CARRIER
customer service (not covered by the maintenance contract).
■ Oil
When replacing the bearings, the oil and oil filter should also
be changed.
■ Control cabinet
The fans are maintenance-free. With active filter mats, the
control cabinet interior does not have to be cleaned. Clean or
replace the filter mats as required (this depends on the ambient
conditions). Clean undamaged filter mats by beating them out
or by carefully blowing them clean with compressed air.
Damaged filter mats should be replaced.
■ Shut-off valves
A Rotalock valve is fitted to the refrigerant outlet at the bottom
of the condenser. It may only be closed while the filter dryer is
being serviced. If a ball shut-off valve is fitted in the line
downstream of the filter dryer, this may also only be closed
during servicing of the filter dryer. In this case, the main
expansion valve must be opened. To do so, first log in the
ADMIN user on the touchscreen, then manually set the
expansion valve opening to 100%. Ensure that the expansion
valve remains open during servicing and until the ball shut-off
valve is reopened. Both valves (Rotalock valve on the
condenser and ball shut-off valve downstream from the filter
dryer) must then be secured against unintentional closing.
For maintenance of the oil filter, the ball shut-off valves upstream
and downstream of the filter must be closed, reopened again
after maintenance, and secured against unintentional closing.
If there is a ball shut-off valve in a line leading to the compressor,
this serves to regulate the compressor temperature and must
not be touched under any circumstances.
The Rotalock valves on the compressor are only used for
technical approval and must not be touched.
Once per year, carry out a function check on the safety equipment
(pressure switches, thermostats, hot gas sensors).
CARRIER recommends at least an annual inspection of the heat
pump by CARRIER customer service.
A maintenance contract is available from CARRIER on request.
If required, please contact our customer service. As part of a
maintenance contract, CARRIER customer service carries out the
work specified in section 0.
The service work specified in the F-gas regulations must be carried
out.
7.2 - Inspection by the operator
The heat pump should be visually inspected for leakages once a
week. For this, pay particular attention to the connections on the
compressor and to the oil circuit.
Check the oil level in the oil separator once a week. This must be
checked while the system is in operation. Please contact CARRIER
customer service if the oil level falls below the lower sight glass.
In the event of leakage, please contact CARRIER immediately.
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