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 necessi
ty. 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 nitro
gen). 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 compo
nent.
Caution
Use only dehydrated nitrogen for detecting leaks or for pressur
ised tests.
Caution
The safety devices may only be set, corrected or replaced by a
qualified professional.
7.2 Standard inspection and maintenance operations
An annual inspection with tightness check is obligatory. Schedule a serv
ice by a qualified professional at a cold time of the year to check the fol
lowing points:
1. Have a qualified professional check that the installation is perform
ing correctly at each periodic service.
2. Have a qualified professional check the heat output by measuring
the difference in temperature between heating flow and return.
3. Have a qualified professional check the safety thermostat settings.
7 Maintenance
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