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Refrigerant Line Connections
LINE SIZES
The refrigerant line sets should be sized according to the
recommendations given in the air conditioner or heat pump
unit installation instructions. Use table 1 to determine cor-
rect braze connection sizes. A field-provided adapter may
be required to match line set connections.
TABLE 1
Refrigerant Line Connections –
Model CHX35
Model Number
Suction
Liquid
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 necessary, 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. 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 al-
loy for copper-to-brass or copper-to-steel connections).
Before making brazed connections, place a field-provided
heat shield, such as a wet rag, against the unit cabinet
and around the piping stubs, expansion valve and sensing
bulb (or remove the sensing bulb temporarily). 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
USE A WET RAG TO PROTECT
THE TXV SENSING BULB
(OR REMOVE THE BULB)
WHEN BRAZING THE
SUCTION LINE.
3
FIGURE 7. 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.
