21
SERVICE AND MAINTENANCE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death. Before installing, modifying, or servicing system,
main electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
WARNING
!
Remove unit grille, filter, and condensate pan for cleaning,
lubricating, or replacing parts.
Minimum Maintenance
1. Check, clean, or replace air filter each month or as required.
2. Check cooling coil, drain pan, condensate trap, and
condensate drain pan each cooling season for cleanliness.
Clean as necessary.
3. Check fan motor and wheel for cleanliness each heating and
cooling season.
4. Check electrical connections for tightness and controls for
proper operation each heating and cooling season. Service
as necessary.
TO CLEAN OR REPLACE AIR FILTERS
1. Place a plastic sheet on the floor to catch any water that may
spill from drain pan.
2. Slide filter out.
3. Vacuum clean or wash filter with soapy water. Rinse and let
air dry. If filter needs replacing, filters are available from a
local dealer.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Operating the system with dirty air filters may damage the
indoor unit and can cause reduced cooling performance,
intermittent system operation, frost build--up on the indoor coil,
and blown fuses.
Inspect and clean or replace the air filters monthly.
!
WARNING
Pump--down Procedure
The system may be pumped down in order to make repairs on the
low side without losing complete refrigerant charge.
1. Attach pressure gage to suction service valve gage port.
2. Front--seat the mixed phase line valve.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation. The unit coils hold only the
factory--designated amount of refrigerant.
Additional refrigerant may cause units to relieve pressure
through the compressor internal pressure relief valve (indicated
by a sudden rise of suction pressure) before suction pressure
reaches 20 psig.
If this occurs, shut off unit immediately then front--seat the
suction valve and remove and recover excess refrigerant
following accepted practices.
!
WARNING
3. Start unit and run until suction pressure reaches 5 psig.
4. Shut unit off and front--seat suction valve.
5. Depressurize low side of unit and recover refrigerant
following accepted practices.
Filter Drier
Whenever the filter drier is exposed to the atmosphere it must be
replaced. Only use factory specified liquid--line filter driers with
rated working pressures less than 600 psig.
NOTE
: Do not install a suction--line filter drier in the mixed phase
line.
REFRIGERANT CHARGING
PERSONAL INJURY AND/OR EQUIPMENT DAMAGE
HAZARD
Failure to follow this warning could result in personal injury
and/or equipment damage. Wear safety glasses and gloves
when handling refrigerant. Do not overcharge system -- this
can cause compressor flooding.
WARNING
!
All units are shipped with the refrigerant charge listed on
nameplate.
NOTE
:
Do not vent or depressurize unit refrigerant to
atmosphere. Remove and recover refrigerant following
accepted practices
.
