NOTE
S735 must be serviced once a year by competent
and qualified personnel, such as a NIBE a service
engineer or other qualified professional.
When replacing components on S735 only replace-
ment parts from NIBE may be used.
NOTE
Take the necessary safety precautions. Ensure
that the heat pump is not connected to the power
prior to servicing or maintenance work.
NOTE
If an electrical connection has been disconnected
and is connected, ground must be checked using
a suitable multimeter.
NOTE
An immersion heater without a temperature limiter
is not allowed to be installed.
NOTE
Inspection of the water heater can be carried out
via the flange located at the top of the water
heater using an inspection instrument such as an
endoscope.
NOTE
After servicing, complete the relevant Service In-
terval Record section of the Benchmark Checklist
located at the back of this document.
Completion of the Service Interval Record is a
condition of warranty. For full terms and conditions
of warranty, please see our website nibe.co.uk.
Caution
The fan is in operation, even when S735 is turned
off and the status lamp is lit with a blue light.
Maintenance
CLEANING THE FLOOR DRAIN
Condensation forms when the heat pump is working. This
condensation is routed via an overflow cup (WM1) to a drain,
e.g. a floor drain.
The condensation water contains a certain amount of dust
and particles.
Check regularly that any floor drains are not blocked; water
must be able to run through freely. Clean, if necessary.
NOTE
If the floor drain is blocked, water can spill over
onto the floor of the installation area. To prevent
damage to the building, a waterproof floor or floor
membrane is recommended.
GENERAL INSPECTION
Check the following:
1. Condition of casing.
2. Electrical connections.
3. Pipe connections.
4. Alarm log.
Correct any fault before continuing.
WATER HEATER
Check the following:
1. Hot water start and stop temperature.
2. Pressure controlled bypass valve.
3. T&P valve.
4. Overflow pipe.
5. Pressure expansion vessel.
6. Expansion relief valve.
Correct any fault before continuing.
HOT WATER SETTINGS
Check the following:
1. Hot water start and stop temperature.
2. Hot water mode.
Correct any fault before continuing.
CLIMATE SYSTEM
Check the following:
1. Climate system start and stop temperature.
2. Heating curve settings.
3. Function of the room sensor (if installed).
4. Limiting valve settings.
5. System pressure.
6. Flow and return temperature. The difference must be
5 - 10 °C
Correct any fault before continuing.
NIBE S735Chapter 10 | Service58
Service
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