1
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SUMMER OPERATION
is when your system is operating on COOLING CYCLE, the room
air is circulated through the fi lter and indoor unit where heat, excess moisture and dust are
removed. The clean, cool air is then returned to your room. Dust and other air born particles are
trapped in the fi lter, and condensed moisture is drained away. The indoor heat is transferred
by interconnecting refrigeration pipes to the outdoor unit, which then exhaust this heat to the
outdoor atmosphere.
WINTER OPERATION
is just the reverse use of the system to obtain heat into our rooms.
During the HEATING CYCLE the outdoor unit extracts heat from the outside air and then
transferred by the same interconnecting pipes to the indoor unit where the circulated air is
heated and returned to your rooms. Again, the room air is fi ltered reducing dust and other
particles.
ACCESS PANELS AND GUARDS:
NEVER remove any access panels
or guards as this could cause injury from electric shock and burns from
extremely hot components. Never allow any bodily parts such as fi ngers
or objects to protrude through the fan guards or any other opening as
they could cause personal injury and damage the air conditioner.
INSTALLATION MUST BE CARRIED OUT BY QUALIFIED INSTALLER:
RETURN AIR FILTER:
The air conditioner must never be operated without a return air fi lter as
this will allow a build up of dust etc on the Indoor Coil. This is very diffi cult to clean and causes
the system to operate ineffi ciently or even fail.
CRANKCASE HEATER PRECAUTION:
The main power ( Outside switch board ) to the system
must be kept ON at all times to prevent damage to the outdoor compressor unit. Should the
main power be disconnected or interrupted for 6 hours or longer, then no attempt should be
made to start the system for 2 hours after the power has been restored to outdoor unit. This
allows the compressor to warm up, and remove any liquid refrigerant that may cause damage.
INSIDE THIS MANUAL
You will fi nd instructions for two types of wall controllers, the
standard
7-Day programmable model LM7 and the optional model LM24. The LM7 series controllers
have all the features of LM24 series plus the addition of a fully programmable 7-Day Timeclock.
NOTE: Most of the basic functions in this manual are shown using the LM24 controller,
the buttons and basic functions are the same for LM7.
SAFETY AND OPERATION PRECAUTION
GENERAL INFORMATION
