BC1 and BC4X Evaporator Coil Installation Manual

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Refrigerant Line Connections
Line Sizes
The refrigerant line sets should be sized according to the
recommendations given in the condensing unit installation
instructions. Use Table 1 to determine correct braze
connection sizes. A eld-provided adapter may be required
to match line set connections.
Model Number Suction Liquid
18/24
24
30
30/36
36
3/4 Inch
3/8 Inch
48
49
50/60
60
7/8 Inch
Table 1. Refrigerant Line Connections
Replacement Parts
If replacement parts are necessary, order kit 69J46. The
kit includes:
• 10 – Brass nuts for liquid line assemblies
• 20 – Teon rings
• 10 – Liquid line orice housings
• 10 Liquid line assemblies
TEFLON RINGS (20)
BRASS NUTS (10)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
LIQUID LINE ORIFICE HOUSINGS (10)
LIQUID LINE
ASSEMBLY
COPPER
TUBE
PISTON
RETAINER
STRAINER
Figure 1. 69J46 Kit Components
Brazing Guidelines
Use a silver alloy brazing rod (5 or 6 percent silver alloy for
copper-to-copper connections or 45 percent silver alloy for
copper-to-brass or copper-to-steel connections).
Before making brazed connections, place a eld-provided
heat shield, such as a wet rag, against the unit cabinet
and around the piping stubs, expansion valve and sensing
bulb. The heat shield must be in place to prevent heat
damage during brazing. See Figure 2.
WATER-
SATURATED
RAGS
PLACE A WET RAG AGAINST
COIL CABINET AND AROUND
THE SUCTION LINE
CONNECTION.
BRAZE CONNECTION. ALLOW
PIPE TO COOL BEFORE
REMOVING WET RAG.
1
2
Figure 2. Braze Refrigerant Lines
Suction Line Connection
Use the following procedure to connect the suction line to
the indoor coil:
1. Remove rubber plug from the stubbed connection.
2. Position the properly sized refrigerant piping and
make the brazed connection following the brazing
guidelines.
3. Do not remove the water-saturated rags from the
cabinet and piping until the piping has cooled
completely.
BC1P Suction Line Equalizer Fitting
Remove the copper are seat bonnet if present from the
male equalizer line tting (Figure 3).
When removing the are nut, ensure that the copper
are seal bonnet is removed as illustrated in Figure 3.
IMPORTANT
SUCTION LINE
FLARE NUT
REMOVE AND DISCARD FLARE
SEAL BONNET IF PRESENT
MALE BRASS EQUALIZER LINE
FITTING
FLARE
SEAL CAP
OR
Figure 3. BC1P Suction Line Male Equalizer Line
Fitting Modications
BC1P Liquid Line Connection
NOTE: BC1P coils are shipped with a factory-installed
HFC-410A xed orice (RFC) metering device. Some
system matches with this coil require use of a check/
expansion valve.