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connecting refrigerant tubing between the
indoor & outdoor Unit
caUtion:
this system uses r-22 refrigerant with mineral
oil. When servicing, cover or seal openings to
minimize the exposure of the refrigerant system
to air to prevent accumulation of moisture and
other contaminants.
After outdoor and indoor unit placement has been
determined, route refrigerant tubing between the
equipment in accordance with sound installation practices.
• When connecting refrigerant line sets together, it is
recommended that dry nitrogen be flowing through the
joints during brazing. This will prevent internal oxidation
and scaling from occurring.
• Refrigerant tubing should be routed in a manner that
minimizes the length of tubing and the number of bends
in the tubing.
• Refrigerant tubing should be supported in a manner
that the tubing will not vibrate or abrade during system
operation.
• Tubing should be kept clean of foreign debris during
installation.
• Every effort should be made by the installer to ensure
that the field installed refrigerant containing components
of the system have been installed in accordance with
these instructions and sound installation practices to
insure reliable system operation and longevity.
• The maximum vertical elevation difference between
the indoor and outdoor sections should not exceed 20
feet.
• If precise forming of refrigerant lines is required, a copper
tubing bender is recommended. Avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
• It is recommended a filter dryer be installed in the liquid
line of the system if cleanliness of the tubing or adequacy
of system evacuation is unknown or compromised. If
the installation replaces a system with a filter dryer
already present in the liquid line, the filter dryer must
be replaced with a new one of equal capacity. The filter
dryer must be installed in strict accordance with the
manufacturer's installation instructions.
• Optional equipment such as liquid line solenoid valves,
low ambient, etc., should be installed in strict accordance
with the manufacturer's installation instructions.
6
electrical Wiring
Warning:
to avoid risk of electrical shock, personal
injury, or death, disconnect all electrical power
to the unit before performing any maintenance
or service. the unit may have more than one
electrical supply.
label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation.
• All electrical connections must be in compliance with all
applicable state, national, or local codes and ordinaces
that take precedence.
pre-electrical checklist
√ Verify that the voltage, frequency, and phase of the
supply source match the specifications on the unit rating
plate.
√ Verify that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
Refer to the unit wiring label for proper high and low
voltage wiring.
√ Verify factory wiring is in accordance with the unit wiring
diagram (Figures 4 & 5, pages 12 & 13). Inspect for
loose connections.
√ Phase balance on 3 phase units must always be
checked. See Unbalanced 3-Phase Supply Voltage
section (page 7).
line Voltage
• A wiring diagram is located on the inside cover of the
electrical box of the outdoor unit. The installer should
become familiar with the wiring diagram before making
any electrical connections to the outdoor unit.
• an electrical disconnect must be located within
sight of and readily accessible to the unit. This
switch shall be capable of electrically de-energizing
the outdoor unit.
• Line voltage to the unit should be supplied from a
dedicated branch circuit containing the correct fuse
or circuit breaker for the unit. Incoming field wiring
and minimum size of electrical conductors and circuit
protection must be in compliance with information listed
on the outdoor unit data label. Any other wiring methods
must be acceptable to authority having jurisdiction.
• The outdoor unit requires both power and control circuit
electrical connections. Refer to the wiring diagram /
schematic for identification and location of outdoor unit
field wiring interfaces. See Figures 4 & 5 (pages 12 &
13). Make all electrical connections in accordance with
all applicable codes and ordinances.
• Overcurrent protection must be provided at the branch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes.
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