35
Compressor Protection
COMPRESSOR OVER-TEMPERATURE PROTECTION (IP)
A thermostat installed on the compressor motor winding reacts
to excessively high winding temperatures and shuts off the
compressor.
CRANKCASE HEATER
The heater minimizes absorption of liquid refrigerant by oil in
the crankcase during brief or extended shutdown periods. The
heater is wired to cycle with the compressor; the heater is off
when compressor is running, and on when compressor is off.
The crankcase heater will operate as long as the power circuit
is energized. The main disconnect must be on to energize the
crankcase heater.
ADVANCED SCROLL TEMPERATURE PROTECTION
(ASTP)
See “Advanced Scroll Temperature Protection (ASTP)” on
page 21.
LOW-PRESSURE SWITCH
The 569J low-pressure switch is stem-mounted on the suction
line. Switches are all fixed, non-adjustable type.
HIGH-PRESSURE SWITCH
The high-pressure switch is stem mounted on the discharge
line. The switch is a fixed, non-adjustable type.
OUTDOOR FANS
Each fan is supported by a formed-wire mount bolted to the fan
deck and covered with a wire guard. Fan motors have perma-
nently lubricated bearings.
1. Shut off unit power supply. Install lockout tag.
2. Remove outdoor fan assembly (grille, motor, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 38.
5. Tighten setscrews to 84 in-lbs (949 N-cm).
6. Replace outdoor fan assembly.
Fig. 38 — Outdoor Fan Blade Position
LUBRICATION
Fan Motors
The fan motors have sealed bearings. No provisions are made
for lubrication.
Compressor
The compressor has its own oil supply. Loss of oil due to a leak
in the system should be the only reason for adding oil after the
system has been in operation.
ROUTINE CLEANING OF ROUND-TUBE PLATE FIN
(RTPF) COILS
Periodic cleaning with Totaline
®
environmentally sound coil
cleaner is essential to extend the life of RTPF coils. This clean-
er is available from Replacement Parts division as part number
P902-0301 for a one gallon container, and part number P902-0305
for a 5 gallon container. It is recommended that all RTPF coils be
cleaned with the Totaline environmentally sound coil cleaner as
described below.
Coil cleaning should be part of the unit’s regularly scheduled
maintenance procedures to ensure long life of the coil. Failure
to clean the coils may result in reduced durability in the envi-
ronment.
Avoid the use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally sound coil cleaner is non-flammable,
hypoallergenic, non-bacterial, and a USDA accepted biode-
gradable agent that will not harm the coil or surrounding com-
ponents such as electrical wiring, painted metal surfaces, or in-
sulation. Use of non-recommended coil cleaners is strongly
discouraged since coil and unit durability could be affected.
TOTALINE ENVIRONMENTALLY SOUND COIL
CLEANER APPLICATION EQUIPMENT
• 2
1
/
2
gallon garden sprayer
• water rinse with low velocity spray nozzle
Totaline Environmentally Sound Coil Cleaner Application
Instructions:
NOTE: Proper eye protection such as safety glasses is recom-
mended during mixing and application.
1. Turn off unit power.
2. Remove screws holding rear corner post and top cover in
place. Pivot top cover up 12 to 18 inches (305 to 457 mm)
and support with a rigid support. See Fig. 39.
IMPORTANT: Never open any switch or disconnect that
energizes the crankcase heater unless unit is being ser-
viced or is to be shut down for a prolonged period. After a
prolonged shutdown on a service job, energize the crank-
case heater for 24 hours before starting the compressor.
3.6 mm +0/0/-0.8
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in accelerated cor-
rosion of unit parts.
Harsh chemicals, household bleach or acid or basic clean-
ers should not be used to clean outdoor or indoor coils of
any kind. These cleaners can be very difficult to rinse out of
the coil and can accelerate corrosion at the fin/tube inter-
face where dissimilar materials are in contact. If there is
dirt below the surface of the coil, use the environmentally
balanced coil cleaner.
IMPORTANT: High velocity water from a pressure washer,
garden hose, or compressed air should never be used to clean
a coil. The force of the water or air jet will bend the fin edges
and increase airside pressure drop, resulting in reduced unit
performance.
