Instruction manual

OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
26 (32)
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
TEMPERATURE CONTROL
PROBLEM POSSIBLE CAUSE CHECK / REMEDY
ROOM TEMPERATURE TOO HIGH The parameter settings on the control
panel are not correct
Check the room temperature setting; see
control panel instruction manual.
(high room temperature alarm) Lack of air flow. See ”Lack Of Air Flow”.
The compressor does not work when
called by the control panel.
See ”The Compressor Does Not Work”.
Insufficient compressor output See ”Compressor High Output Pressure”,
”Compressor Low Intake Pressure”.
The control system does not work
properly
See the control panel instruction manual;
check that the control panel and sensors
work properly.
Heat load higher than expected. Check: fresh air conditions and volume,
external air infiltration and latent load,
particularly with dehumidification.
ROOM TEMPERATURE TOO LOW
(Low room temperature alarm)
The parameter settings on the control
panel are not correct.
Check the room temperature setting; see the
control panel instruction manual
Electric heater does not work. 1) Check electric heater operation
2) Check electric heater power supply
3) If there is a heater alarm, remove the
cause and re-set the safety thermostat
The control system is not working. See control panel instruction manual; check
that control panel and/or sensors work
properly.
Thermal leakage higher than expected Check thermal leakage and entry of external
air.
HUMIDITY CONTROL
PROBLEM POSSIBLE CAUSE CHECK / REMEDY
ROOM HUMIDITY TOO HIGH
(High room humidity alarm)
A) The parameter settings on the
control panel are not correct.
Check room humidity settings; see the
control panel instruction manual.
B) Latent load higher than expected Check: latent load, fresh air conditions and
volume, external air infiltration
C) The compressor does not function
during dehumidification.
See “The Compressor Doesn’t Work”
D) The control system is not working. See control panel instruction manual; check
that control panel and sensors work properly.
ROOM HUMIDITY TOO LOW
(Low room humidity alarm)
A) The parameter settings on the
control panel are not correct.
Check the room temperature setting; see
also the control panel instruction manual.
B) Latent load lower than expected. Check: quantity of the latent load, fresh air
conditions and volume, external air
infiltration