7
X. Maintenance
WARNING
To avoid death or personal injury due to
electrical shock, disconnect electrical
power before performing any mainte-
nance.
Replacing Or Cleaning Filter
A return air filter is not supplied with this unit; however,
there must be a means of filtering all of the return air. The
filter(s) may be located in the return air duct(s), or return
air filter grille(s). Consult with your installing dealer for the
actual location of the return air filter(s) for your unit.
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 neces-
sary because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
with a new, clean filter. Dirty permanent filters should be
washed with water, thoroughly dried and sprayed with a
filter adhesive before being reinstalled. (Filter adhesives
may be found at many hardware stores.) Permanent
filters should last several years; however, should one
become torn or uncleanable, it should be replaced.
Maintaining Cabinet Finish
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in areas with high ultraviolet radiation.
Clean Outside Coil (Qualified Servicer
Only)
The coil with the outside air flowing over it should be
inspected annually and cleaned as frequently as neces-
sary to keep the finned areas free of lint, hair and debris.
Condenser and Evaporator Motors
Bearings on the air circulating blower motor and the
condenser motor are permanently lubricated. No addi-
tional oiling is required.
WARNING
To avoid death or personal injury due to
electrical shock, do not remove any
internal compartment covers or attempt
any adjustment.
CAUTION
Verify proper operation after servicing.
VIII. Sequence of Operations
Normal Sequence of Operations
NOTE: There is a fan delay on initial power to unit before
the low voltage board resets and is operational.
1. Thermostat calls for heating or cooling. The compres-
sor and outdoor fan are energized.
2. Approximately 30 seconds later, the indoor fan starts.
3. The unit will deliver heating or cooling to the condi-
tioned space until the thermostat is satisfied.
4. The compressor and outdoor fan will be de-energized
when the thermostat opens.
5. The indoor fan continues to run for approximately 30
seconds after the thermostat is satisfied. This allows
additional cooling from the indoor coil to be trans-
ferred to the conditioned space. Then, the indoor fan
stops.
IX. Startup and Adjustment
CAUTION
This unit must not be used as a
“construction heater” during the finishing
phases of construction on a new
structure. This type of use may result in
premature failure of the unit due to
extremely low return air temperatures
and exposure to very dirty atmospheres.
Compressor Protection Devices
The PHB**C and PHD**C compressor includes compo-
nents which are designed to protect the compressor
against abnormal operating conditions.
WARNING
To avoid death or personal injury, always
disconnect electrical power before
inspecting or servicing the unit. All
compressor protection devices reset
automatically, energizing the contactor
and outdoor fan.
Operating Instructions
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the
COOL or HEAT position (or AUTO if available, and if
automatic changeover from cooling to heating is
desired).
3. Set the room thermostat to the desired temperature.