Stulz Tel-Air-2 Series, Operating Instructions Manual

Page: 53 / 72

E/0618/35A/53
9. Maintenance
Very little ordinary maintenance is required to keep the unit reliable and protect the moving parts.
This maintenance, however, must be performed according to prescribed maintenance intervals.
Failure to perform maintenance, in addition to affecting the unit durability and operation,
invalidates the warranty.
Switch off the power supply of the unit before performing any maintenance
measures.
The ON-OFF button on the C2020 display (if present) is only used to put the unit on
stand-by. It must therefore not be considered as a safety device for switching off
the unit prior to maintenance operations.
Maintenance operations may only be performed by authorised and qualified
technicians.
9.1 Preventive maintenance schedule
Once monthly

CONDENSATE DRAIN: check that the condensate drainage system is perfectly clean and
operational.

FANS: check that the fans do not show signs of overheating or abnormal vibrations and that
they turn freely.

COOLING CIRCUIT: Pressure switches and liquid indicators.

AIR FILTERS: check the air filter, clean it or replace if necessary (dirty filter alarm). If you
decide to change the filter, the medium and thickness of the spare must be the same as the
original. A set of spare filters can be ordered to the STULZ service dept.
Once quarterly

EXCHANGERS: check that the exchangers are efficient and not soiled.
If the air conditioner works in exceptionally dirty environments or if experience
shows that it requires more frequent maintenance then this maintenance must be
performed as required.
Once yearly

COMPRESSOR: check the oil level from the compressor indicator.

ELECTRIC CIRCUIT: check that the electrical connections are tight and that the remote
switches and the general switch are operational and in good condition. Also check that the
control board works and perform an alarm signal test.

MECHANICAL PARTS: clean the internal parts of the system.
Replacing the air filters
Proceed as follows:

For TLF/TLD: remove the upper front panel. For TLU: remove the lower front panel.