Page 19
TSA*H4 SERIES
LOW PRESSURE SWITCH
TSA*H4 units are equipped with a low pressure switch that
is located in the suction line to the compressor. The switch
is a SPST, auto−reset switch that is normally closed. The
switch opens at 25 psi and closes at 40 psi.
Maintenance
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
OUTDOOR UNIT
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
2. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4. Check all wiring for loose connections.
5. Check for correct voltage at unit (unit operating).
6. Check amp draw on outdoor fan motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
7. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge should be
checked.
INDOOR COIL
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
INDOOR UNIT
1. Clean or change filters.
2. Blower motors are prelubricated and permanently
sealed. No more lubrication is needed.
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
4.
Belt Drive Blowers −
Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
OPTIONAL ACCESSORIES
Refer to the Engineering Handbook for optional
accessories that may apply to this unit. The following may
or may not apply:
Timed Off Control
Sound Cover
Suction Line Drier
Stand−Off Kit
Low Ambient Kit
Homeowner Information
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface
of steel and aluminum parts and diminish
performance and longevity of the unit.
NOTE − A white residue may appear on the coil guards and
grilles on outdoor units. The residue is a non−toxic
byproduct of manufacturing the flexible coating. It can be
removed by wiping the coil guard with a cloth.
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
1. Make sure power is off before cleaning. Clean and
inspect outdoor coil. The coil may be flushed with a
water hose.
2. The outdoor coil is protected by an inner mesh screen
and a wire cage (see figure 33). If debris has collected
between the mesh screen and the coil and cannot be
dislodged by spraying unpressurized water from
inside coil surface to the outside, the mesh may be
removed by first removing the top of the unit which will
allow for removal of the wire cage.
3. Then, using pliers to grip the head of the push pins, pull
straight out to extract the push pins along one side of
the coil. If necessary, remove the push pins along the
back of the unit; it is usually unnecessary to fully
remove the inner mesh screen.
4. Drape the mesh screen back and wash the coil. When
all the debris has been removed from the coil, reinstall
the mesh screen by positioning it in its original position
and reinserting the push pin. No tool is required to
push the pin back into the same slot in the fins.
5. If the push pin is loose and tends not to stay in place,
brush the fins with a fin brush (22 fins/in). Line up the
