506694-01
Issue 1720
Page 15 of 16
Electric Shock Hazard
. Can cause injury or death. Unit must be grounded in accordance with national and
local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors.
Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power
supplies.
WARNING
Figure 11. Typical Unit Wiring Diagram
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
IMPORTANT
Servicing Outdoor Unit Delivered Void of
Nitrogen Charge
If the outdoor unit is void of factory nitrogen charge, clean
the system using the procedure described below.
1. Use nitrogen to repressurize system and check for
leaks.
2. Evacuate the system using evacuating procedure
provided in this instruction.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using evacuating
procedure provided in this instruction.
5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary
to replace the filter drier several times to achieve
the required dryness level. If system dryness is not
verified, the compressor will fail in the future.
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:
Outdoor Unit
1. Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
