Bryant Model 378 - Manual (Page 7)

CONNECTING CONDENSING UNIT
TO R TYPE MODEL 378
The evaporator coil is supplied as an integral part
of the “R” Type 378 unit.
The condensing unit may be installed remotely or
adjacent to the “R” Type 378 unit.
Consult Condensing Unit Installation Instructions
for minimum clearances and connection of refrigerant
tubing.
All openings in refrigerant lines from evaporator
coil and condensing unit are plugged or capped to
keep moisture out of the system. These plugs or
caps should not be removed until each connection
is made. Each connection should be made in the
shortest time possible to avoid contamination from
surrounding air.
Note: The 90R and 120R 378 units have a factory
installed expansion valve. Items 1 through 5 will,
therefore, not apply for these sizes in the following
instructions. The expansion valves for the 48R and
60R 378 units are supplied as a loose part with the
condensing unit.
To install the expansion valve, proceed as follows:
1. Remove panels from right-hand side of the 378
unit.
2.
Remove plug from flare nut connector on dis­
tributor and insert expansion valve.
3. Remove plug from external equalizer line flare
fitting and connect equalizer to expansion valve.
4. Shipped as loose parts on 48 & 60 sizes are
2 large metal seals, a neoprene gasket, and nuts and
nuts and bolts to seal the liquid line opening. In­
stall air seals as shown.
5. Uncoil capillary line of Expansion valve and
attach sensing bulb to top of horizontal suction
line inside of unit casing. Wrap bulb with prestite
tape (shipped with unit as a loose part).
6. Connect coil to condensing unit per instructions
packaged with the condensing unit.
7. Follow procedures outlined in Condensing Unit
Installation Instruction for leak testing and evacua­
tion.
8. Replace panels on unit and connect condensate
(located on opposite side of unit) to a suitable
drain site.
9. All electrical connections should be made in
accordance with National Electric Code and any
local codes that might apply. Make electrical con­
nections as shown in wiring diagram in condensing
unit instruction and the low voltage diagram in this
instruction.
CONNECTING GAS AIR CONDITIONER
TO W TYPE 378
AH Weather Indoor—Outdoor Unit
Water Coil Connections
For installation of chilled water lines from the gas
air conditioner to the water coil in the Model 378,
refer to installation instructions furnished with the
gas air conditioner.
For piping and wiring recommendations on multiple
gas air conditioner installations as required for the
Models 90W 378 and 108W, contact your Bryant
distributor.
Winter Shut-Down Protection
It will be necessary to add anti-freeze to the chilled
water system for winter protection whether the
Model 378 is installed indoors or outdoors. The ad­
dition of the anti-freeze will furnish freeze protec­
tion for the coil and piping. It will also provide for
expansion of water in the coil if the coil is located
in the heated air stream.
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