14
MAINTENANCE
HIGH VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
. M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
IMPROPER
INSTALLATION
,
ADJUSTMENT
,
ALTERATION
,
SERVICE
OR
MAINTENANCE
,
REFER
TO
THIS
MANUAL
. F
OR
ADDITIONAL
ASSISTANCE
OR
INFORMATION
,
CONSULT
A
QUALIFIED
INSTALLER
,
SERVICE
AGENCY
OR
THE
GAS
SUPPLIER
.
WARNING
S
HEET
METAL
PARTS
,
SCREWS
,
CLIPS
AND
SIMILAR
ITEMS
INHERENTLY
HAVE
SHARP
EDGES
,
AND
IT
IS
NECESSARY
THAT
THE
INSTALLER
AND
SERVICE
PERSONNEL
EXERCISE
CAUTION
.
CAUTION
The Self Contained Packaged Air Conditioner and Heat Pump should
operate for many years without excessive service calls if the unit is
installed properly. However it is recommended that the home-
owner inspect the unit before a seasonal start up. The coils should
be free of debris so adequate airflow is achieved. The return and
supply registers should be free of any obstructions. The filters
should be cleaned or replaced. These few steps will help to keep
the product up time to a maximum. The Service section that fol-
lows should help in identifying problems if the unit does not oper-
ate properly.
F
ILTERS
CAUTION
T
O PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OF
EQUIPMENT EFFICIENCY OR EQUIPMENT DAMAGE DUE TO DUST AND LINT
BUILD UP ON INTERNAL PARTS, NEVER OPERATE UNIT WITHOUT AN AIR
FILTER INSTALLED IN THE RETURN AIR SYSTEM.
Every application may require a different frequency of replace-
ment of dirty filters. Filters must be replaced at least every three
(3) months during operating seasons.
Dirty filters are the most common cause of inadequate heating or
cooling performance. Filter inspection should be made at least
every two months; more often if necessary because of local condi-
tions and usage.
Dirty throwaway filters should be discarded and replaced with a
new, clean filter.
Disposable return air filters are supplied with this unit. See the
unit Specification Sheet or Technical Manual for the correct size
and part number. To remove the filters, remove the filter access
panel on return side of the unit.
C
ABINET
F
INISH
M
AINTENANCE
Use a fine grade automotive wax on the cabinet finish to maintain
the finish’s original high luster. This is especially important in in-
stallations with extended periods of direct sunlight.
C
LEAN
O
UTSIDE
C
OIL
(Q
UALIFIED
S
ERVICER
O
NLY
)
The coil with the outside air flowing over it should be inspected
annually and cleaned as frequently as necessary to keep the finned
areas free of lint, hair and debris.
L
UBRICATION
The fan shaft bearings , the 1 to 2 HP supply fan motors, the con-
denser fan motors and compressors are permanently lubricated.
F
UNCTIONAL
P
ARTS
Refer to the unit Parts Catalog for a list of functional parts. Parts
are available from your distributor.
TROUBLESHOOTING
THE FOLLOWING INFORMATION IS FOR USE BY QUALIFIED SER-
VICE AGENCY ONLY: OTHERS SHOULD NOT ATTEMPT TO SERVICE
THIS EQUIPMENT.
Common Causes of Unsatisfactory Operation of Heat Pump on the
Heating Cycle.
I
NADEQUATE
A
IR
V
OLUME
T
HROUGH
I
NDOOR
C
OIL
When a heat pump is in the heating cycle, the indoor coil is func-
tioning as a condenser. The return air filter must always be clean,
and sufficient air volume must pass through the indoor coil to pre-
vent excessive discharge pressure, and high pressure cut out.
O
UTSIDE
A
IR
INTO
R
ETURN
D
UCT
Do not introduce cold outside air into the return duct of a heat
pump installation. For units with 2-speed motors, do not allow air
entering the indoor coil to drop below 65° F. Air below this tem-
perature will cause low discharge pressure, thus low suction pres-
sure, and excessive defrost cycling resulting in low heating output.
It may also cause false defrosting.
U
NDERCHARGE
An undercharged heat pump on the heating cycle will cause low
discharge pressure resulting in low suction pressure and frost ac-
cumulation on the outdoor coil.
P
OOR
“T
ERMINATING
” S
ENSOR
CONTACT
The unit’s defrost terminating sensor must make good thermal
contact with the outdoor coil tubing. Poor contact may not termi-
nate the unit’s defrost cycle quickly enough to prevent the unit
from cutting out on high discharge pressure.
