User Guide

820900-UUM-A-1011
Johnson Controls Unitary Products 5
REGISTERS
Supply and return air registers must be open when the
unit is in operation. Furniture must not block airflow in
or out of the registers.
CONDENSER COIL
An annual check and cleaning of the outdoor coil
should be done. Clean any debris and dirt from the out-
side coil face with a brush being careful not to damage
the fins. If extremely dirty, a hose can be used to wash
the coil from the inside out while brushing a soapy solu-
tion on the outside.
BLOWER ASSEMBLY
Even with good filters properly in place, blower wheels
and motors will become dust laden after long months of
operation. The entire blower assembly should be
inspected annually. If the motor and wheel are heavily
coated with dust, they can be brushed and cleaned
with a vacuum cleaner.
CHARACTERISTICS OF HEAT PUMPS
A CONSTANT HEAT
Heat pumps have a noticeably cooler supply air tem-
perature than furnaces. The common practice of over-
sizing furnaces contributes to an "off-and-on-again"
operation with short blasts of hot supply air. The heat
pump system is sized more closely to the heating
needs of your home. Heat is supplied at a lower tem-
perature over a longer period of time to provide a more
constant heat, and it may give you the impression that
your system "never stops running".
WATER RUN - OFF
During the heating cycle, you may notice water running
off the outdoor coil. Moisture from the air is condensed
on the outside surface of the coil where it gathers and
runs off. No need for alarm, your unit has not sprung a
leak!
OUTDOOR COIL DEFROSTING
At certain outdoor conditions (low temperature, high
humidity), frost may build up on the coil of the outdoor
unit. In order to maintain heating efficiency, the system
will automatically defrost itself.
Water vapor rising from the outdoor unit is normal and
is an indication of proper operation. The vapor cloud
will only last for a few minutes. When the defrost cycle
is completed, the system will automatically switch back
to heating. Electric heat is automatically energized to
maintain comfort during defrost.
BEFORE CALLING A SERVICE PERSON
• Check thermostat setting and insure thermostat is
calling for heat or cooling. Check thermostat for
lint, etc.
• Check fuses or circuit breakers
• Check filters for excessive dust accumulation
FIGURE 3 - END VIEW LESS FILTER ACCESS
PANEL 15 AND 20 TON
20 TON
(4) 16" X 20"
FILTERS
(4) 16" X 25"
FILTERS
(6) 12" X 24"
FILTERS
(6) 12" X 24"
FILTERS
15 TON
INDOOR COIL
CONDENSATE
DRAIN
CONNECTION
CONDENSATE
DRAIN
CONNECTION
INDOOR COIL