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Refrigerant Piping - Install Indoor Expansion Valve
This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at
the indoor coil. See the Product Specifications for approved expansion valve kit match-ups and application information. The
check expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is
being installed in a field-provided plenum, install the check/expansion valve in a manner that will provide access for future
field service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
(Uncased Coil Shown)
PATCH PLATE
(UNCASED
LIQUID LINE
COIL ONLY)
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
For optimum performance, it is
recommended to install the sensing bulb
outside the cabinet on a straight flat
section of the suction line for the following
units: 030, 036, 042, 048, and 060.
NOTE - Sensing bulb insulation is required
if mounted external to the coil casing.
EQUALIZER LINE INSTALLATION
1 - Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure below.
2 - Remove the field-provided fitting that temporarily
reconnected the liquid line to the indoor unit's
distributor assembly.
FLARE SEAL CAP
31-5000749 Rev. 0
STUB
END
EXPANSION
VALVE
®
TEFLON
RING
®
TEFLON
SENSING
RING
LINE
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
LIQUID LINE
FLARE NUT
OR
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
3 - Install one of the provided Teflon
stubbed end of the check expansion valve and lightly
lubricate the connector threads and expose surface of
®
the Teflon
ring with refrigerant oil.
4 - Attach the stubbed end of the check expansion valve to
the liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or tighten to
20 ft-lb.
5 - Place the remaining Teflon
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon
ring with refrigerant oil.
6 - Attach the liquid line assembly to the check expansion
valve. Finger tighten and use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as
illustrated in the figure above or tighten to 20 ft-lb.
SENSING BULB INSTALLATION
1 - Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE - Though it is preferred to have the sensing bulb
installed on a horizontal run of the vapor line, installation
on a vertical run of piping is acceptable if necessary.
NOTE - Confirm proper thermal contact between vapor
line and check/expansion bulb before insulating the
sensing bulb once installed.
2 - Connect the equalizer line from the check expansion
valve to the equalizer vapor port on the vapor line. Finger
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
below.
VAPOR LINE
12
BULB
VAPOR LINE
12
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
Page 13
1/2 Turn
®
rings around the
11 12
10
9
8
7
®
washer around the other
®
1/8 Turn
11 12
10
9
8
7
ON LINES SMALLER THAN
7/8",
MOUNT
SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
BULB
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
BULB
1
2
3
4
5
6
1
2
3
4
5
6
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