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CH35 SERIES
Refrigerant Line Connections
LINE SIZES
The refrigerant line sets should be sized according to the
recommendations given in the outdoor unit installation
instructions. See table 1 for sweat connection sizes. A
field-provided adapter may be required to match line set
connections.
Table 1. Refrigerant Line Connections
CH35
Model
Suction Line
Connection
Liquid Line
Connection
-18-2F
-24-2F
-30-2F
-36-2F
3/4 Inch
3/8 Inch
-42-2F
-48-2F
-51-2F
-60-2F
7/8 Inch
REPLACEMENT PARTS
If replacement parts are needed for the liquid line orifice
housing or assembly, order kit 69J46. The kit includes:
● 10 - Brass nuts for liquid line assemblies
● 20 - Teflon rings
● 10 - Liquid line orifice 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 6. Liquid Line Orifice Kit (69J46)
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).
Use AL822 Flux Cord Solder Stickers (Lennox catalog
number Y6331) for aluminum to aluminum joints.
Before making brazed connections, place a field-provided
heat shield, such as a wet rag, against the unit cabinet and
around the piping stubs. The heat shield must be in place
to prevent heat damage during brazing. See figure 7.
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 7. Brazing 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.
Suction Line Equalizer Fitting
Remove the copper flare seat bonnet if present from the
male equalizer line fitting (see figure 8).
IMPORTANT
When removing the flare nut, ensure that the copper
flare seal bonnet is removed as illustrated in figure 8.
SUCTION LINE
FLARE NUT
REMOVE AND DISCARD
FLARE SEAL BONNET IF
PRESENT
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
Figure 8. Suction Line Male Equalizer Line Fitting
Modifications
LIQUID LINE CONNECTION
NOTE
- Before the liquid line connections can be made,
the factory-provided refrigerant metering orifice must be
removed and a properly sized expansion valve must be
field-installed.
The system must include a properly matched expansion
valve which must be field-provided and installed. The
CH35 is shipped with a factory-installed refrigerant
metering orifice.
The orifice must be removed BEFORE
a properly sized expansion valve is installed.
Fixed Orifice Removal
1. Remove any shipping clamps holding the liquid line
and distributor assembly.
