66492-YUM-B-0106
Unitary Products Group
3
COOLING CONSERVATION
To comfortably cool your home, your heat pump must
remove both heat and humidity. Don’t turn your system
off even though you will be away all day. On a hot day,
your system may have to operate between 8 and 12
hours to reduce the temperature in your home to a nor-
mal comfort level.
Keep windows closed after sundown. While the out-
door temperature at night may be lower than indoors,
the air is generally loaded with moisture which is
soaked up by furniture, carpets and fabrics. This mois-
ture must be removed when you restart your system.
The hotter the outside temperature, the greater the
load on your system. Therefore do not be alarmed
when your system continues to run after the sun has
set on a hot day. Heat is stored in your outside walls
during the day and will continue to flow into your home
for several hours after sunset.
Use your kitchen exhaust fan when cooking. One sur-
face burner on “High” requires one ton of cooling. Turn
on your bathroom exhaust fan while showering to
remove humidity. You can also help your system in the
summer by closing drapes or blinds and lowering
awnings on windows that get direct sunlight.
MAINTENANCE
In order to insure long and trouble free service from
your system, we recommend periodic inspection,
cleaning, lubrication and adjustment by your installing
Dealer/Contractor. Be sure to ask about this service.
For those buildings with in-house maintenance, please
follow the instructions listed below to care for your sys-
tem.
LUBRICATION
Both the indoor blower motor and outdoor fan motor
are permanently lubricated and require no mainte-
nance.
FILTER CARE
Filters must always be used and must be kept clean.
When filters become dirt laden, insufficient air will be
delivered by the blower, decreasing your units effi-
ciency and increasing operating costs and wear-and-
tear on the unit and controls.
AIR FILTERS
Single phase units are shipped without a filter and is
the responsibility of the installer to place a high velocity
filter into the return air duct system. If an economizer or
outdoor air accessory is used, install a filter/frame kit
(1FF0114). See Figure 1. The filter rack and filters are
standard on three phase units.
Filters should be checked monthly especially since the
unit is used for both heating and cooling. You must
have high velocity permanent filters. High velocity per-
manent filters may be removed for cleaning. Remove
filters, vacuum or wash with a stream of water directly
from a faucet or hose. Allow filters to dry and replace.
High velocity permanent filters should last for many
years. However, if they ever need replacing, they must
be replaced with the same size and type.
NOTE:
Filters must be installed with Air Flow arrows
pointing inward toward the indoor coil.
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".
Prior to any of the following maintenance pro-
cedures, shut off all power to the unit.
