INSTALLATION INSTRUCTIONS Crankcase Heater Kit

INSTALLATION INSTRUCTIONS Crankcase Heater Kit
INSTALLATION INSTRUCTIONS
Crankcase Heater Kit
NASA001CH, NASA002CH, NASA003CH, NASA004CH
These instructions must be read and understood completely before attempting installation.
Safety Considerations:
Installing and servicing of air conditioning equipment can be hazardous due to system pressure and electrical
components. Only trained personnel should install or service air conditioning equipment.
Untrained personnel can perform basic maintenance functions such as cleaning coils or cleaning and replacing filters.
All other operations should be performed by trained service personnel. When working on air conditioning equipment
observe precautions in the literature and on tags and labels attached to the unit.
Follow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for brazing operations. Have a
fire extinguisher available.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and
NOTE
The signal words DANGER, WARNING, CAUTION, and NOTE are used to identify levels of hazard seriousness. The signal word DANGER is only
used on product labels to signify an immediate hazard. The signal words WARNING, CAUTION, and
NOTE will be used on product labels and throughout this manual and other manuals that may apply
to the product.
DANGER − Immediate hazards which will result in
severe personal injury or death.
WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
Signal Words in Manuals
The signal word WARNING is used throughout this
manual in the following manner:
!
WARNING
WARNING
The signal word CAUTION is used throughout this
manual in the following manner:
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with colors
and/or pictures on product labels.
NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to turn off electric power could result in
personal injury or death.
Before installing or servicing system, turn off
main power to the system. There may be more than
one disconnect switch, including accessory heater(s).
482 01 5210 00 January 2006
INSTALLATION INSTRUCTIONS
Crankcase Heater Kit
INTRODUCTION
This instruction covers the installation of Crankcase
Heater Kits in air conditioning equipment.
Crankcase Heaters are used to warm the oil, to reduce
refrigerant migration, and to ensure proper compressor
lubrication.
DESCRIPTION AND USAGE
The crankcase heater warms the compressor crankcase
during the off cycle when ambient temperature is below
66° F. Crankcase heater is wired across the open
contacts of the contactor. When contactor is
de−energized, crankcase heater is on. When contacts
are closed, no current flows through the heater because it
is on the same line voltage side as the compressor.
Included in the kit are:
Crankcase heater
Wiring Label
Installation Instructions
Temperature switch
1
1
1
1
INSTALLATION
Remove unit access panel and control box access panel.
Install crankcase heater on compressor as shown in
Figure 1.
Wrap heater around compressor base below oil level
(heater arms may be spread to slip over piping and
terminal box). Position heater below compressor terminal
box, and approximately 2 inches above compressor
mounting plate. Fasten heater firmly in place with clip
provided on heater.
Wiring: Route one crankcase heater wire into control box
and attach to quick−connect line voltage terminal 11 on
contactor. Cut quick−connect off other crankcase heater
wire, strip and connect to stripped temperature switch
wire with a wire nut. Route other temperature switch wire
into control box and attach to quick−connect line voltage
terminal 21 on contactor.
Temperature switch must be exposed to ambient
temperature. Wire tie temperature switch to wire bundle
outside control box enclosure.
Reinstall control and unit access panels and check unit
operation.
Crankcase Heater Installation and Wiring
Figure 1
CRANKCASE
HEATER
HEATER
FASTENING
CLIP
TEMP SWITCH
CRANKCASE HTR
BLK
COMPRESSOR
BLK
BLK
11
BLK
21
2″
CONTACTOR
A97586
POWER LEADS
2
A90297
482 01 5210 00
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