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some slack in refrigerant tubes between structure and outdoor unit
to absorb vibration. Refer to separate indoor unit installation
instructions for additional information.
Expansion Device
A hard shutoff, thermostatic expansion valve (TXV) is required at
the indoor section of the system for proper operation of these
products. If the indoor section of the system is not equipped with a
hard shutoff TXV, refer to Spec Sheet for the correct TXV kit to be
installed. Follow the instructions in the kit for proper installation.
Filter Drier
The filter drier must be replaced whenever the refrigeration system
is exposed to the atmosphere.
Refer to Fig. 3 and install filter drier as follows:
1. Braze 5- -in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5- -in. (127 mm) liquid tube. Flow
arrow must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
Fig. 3 --- Filter Drier Components
Only use factory specified liquid- -line filter driers with rated
working pressures less than 600 psig.
NOTE: Do not install a suction- -line filter drier in liquid line.
Make Piping Sweat Connections
Remove plastic caps from liquid and suction service valves. Use
refrigerant grade tubing. Service valves are closed from the factory
and are ready for brazing. After wrapping the service valve with a
wet cloth, the tubing set can be brazed to the service valve using
either silver bearing or non- -silver bearing brazing material.
Consult local code requirements. Refrigerant tubing and the indoor
coil are now ready for leak testing.
NOTE: Unit is shipped with Puron (R- -410A) factory charge
indicated on nameplate. Unit is factory- -charged for 15 ft (4.6 m) of
line- -set.
Pass nitrogen or other inert gas through piping while brazing to
prevent formation of copper oxide.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves observe the
following:
S Use a brazing shield.
S Wrap service valves with wet cloth or use a heat sink
material.
Provide Safety Relief
A fusible plug is located in unit suction line; do not cap this plug.
If local code requires additional safety devices, install as directed.
Step 4 —Make Electrical connections
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such operation
would void any applicable Bryant warranty.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
A05178
or death.
Before performing service or maintenance, be sure indoor unit
main power switch is turned OFF and indoor blower has
stopped.
Control Circuit Wiring
Control voltage is 24 v (40 va minimum). See Fig. 4 and unit label
diagram for field- -supplied wiring details. Route control wire
through opening in unit side panel to connection in unit control
box.
Fig. 4 --- 538A Typical Control Circuit Connections
NOTE:
Use No. 18 AWG color- -coded, insulated (35_C
minimum) wire. If thermostat is located more than 100 ft (30.5 m).
from unit, as measured along the control voltage wires, use No. 16
AWG color- -coded wire to avoid excessive voltage drop.
NOTE: All wiring must conform to NEC and local codes.
NOTE: Operating unit on improper line voltage constitutes abuse
and could affect Bryant warranty. See Product Data. Do not install
unit in a system where voltage may fluctuate above or below
permissible limits.
3
WARNING
CAUTION
WARNING
A07398
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