Eaton-Williams Qualitair Technical Manual & Installation Procedures - page 4
PM CHASSIS UNIT MANUAL
:E\Manuals\Others\Qualitair\QPM\LG3298L/22QPMChassisUnit
OPERATING PROCEDURE
General
The controls on your conditioner operate a
switch and thermostat. Correct use of these
controls will ensure efficient operation of
your air conditioner.
Operation
To Recirculate Room Air
Set the lower control to ‘FAN ONLY’.
For Normal Operation
Set the lower control to ‘NORMAL’ and the
upper control to the desired setting. An
automatic heating / cooling changeover
thermostat is fitted as standard. This will
control your unit to maintain the
temperature setting. Always allow the room
conditions to stabilise before resetting the
controls.
For Maximum Cooling / Heating
Set the lower control to ‘BOOST’ and the
upper control fully clockwise (cooling) or
anti-clockwise (heating), as desired.
For Quite Operation
Set the lower control to ‘LOW’ and the upper
control to the desired setting.
For Fresh Air Operation
The fresh air damper can be opened or
closed using the selector switch as desired.
INTERNAL PROTECTION DETAILS
Low Refrigerant Pressure Switch
Prevents compressor operation on low
refrigerant pressure.
Start Delay Timer
Prevents repetitive starting of compressor
(factory set delay 2 minutes).
Low Ambient Thermostat
Prevents compressor operating during low
outside ambient conditions and will also shut
fresh air damper if in ‘OPEN’ position (factory
set at 5°C).
De-Frost Thermostat
Prevents freezing of evaporator and LPHW
coils by preventing compressor operating
and by shutting fresh air damper if in ‘OPEN’
position and switching on LPHW heater
(factory set at 2°C).
Fuses
Main supply fuse 10A protects main
compressor circuit.
Secondary fuse 3.15A protects control circuit
wiring and auxiliary power supply circuit.
(See electrical chassis component layout and
wiring diagrams).
MAINTENANCE
IMPORTANT
Before commencing any maintenance
work, isolate the unit at mains supply.