7 Maintenance
7.1
General
Maintenance operations are important for the following reasons:
To guarantee optimum performance.
To extend the life of the equipment.
To provide an installation which offers the user optimum comfort over
time.
Caution
Maintenance work must be carried out by a qualified professional.
Danger
Before any work, switch off the mains electricity to the heat pump
and the hydraulic or electrical back-up if connected.
Caution
Before working on the refrigeration circuit, switch off the appliance
and wait a few minutes. Certain items of equipment such as the
compressor and the pipes can reach temperatures in excess of
100°C and high pressures, which may cause serious injuries.
Caution
Do not drain the installation, except in cases of absolute
necessity. E.g.: several months' absence with the risk of
temperatures in the building falling below freezing.
7.1.1
Troubleshooting
Caution
All work on the refrigeration circuit must be done by a qualified
professional, according to prevailing codes of practice and safety
in the profession (recovery of the refrigerant, brazing under
nitrogen). All brazing work must be done by qualified welders.
Caution
This appliance is fitted with pressurised equipment, including the
refrigeration pipes.
Caution
Use only original parts to replace a defective refrigeration
component.
Caution
Use only dehydrated nitrogen for detecting leaks or for
pressurised tests.
Caution
The safety devices may only be set, corrected or replaced by a
qualified professional. Any modification must be tested and
reported in the commissioning protocol.
7.2
Standard inspection and maintenance operations
An annual inspection with tightness check is obligatory. Schedule a
service by a qualified professional at a cold time of the year to check the
following points:
1. Operation of the installation.
2. Thermal output, by measuring the difference in temperature between
heating flow and return.
3. The setting for the safety thermostats.
7 Maintenance
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