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STEP 3 -- INSTALLING INDOOR EXPANSION VALVE
This outdoor unit is designed for use in systems that include an expansion valve metering device. See the XCZ20 Product
Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information. The expansion valve
can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field-pro
vided plenum, install the expansion valve in a manner that provides access for future field service of the expansion valve.
Refer to following illustration for reference during installation of expansion valve.
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)
Sensing bulb insulation is required if
mounted external to the coil casing. See
Sensing Bulb Installation for correct bulb
positioning.
EQUALIZER LINE INSTALLATION
A. 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 below.
B. Remove the field-provided fitting that temporarily recon
nected the liquid line to the indoor unit's distributor as
sembly.
FLARE SEAL CAP
STUB
END
EXPANSION
VALVE
TEFLON
RING
®
TEFLON
SENSING
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
LIQUID LINE
FLARE NUT
COPPER FLARE
OR
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
C. Install one of the provided Teflon
stubbed end of the expansion valve and lightly lubricate
the connector threads and expose surface of the Teflon
ring with refrigerant oil.
D. Attach the stubbed end of the 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.
E. Place the remaining Teflon
end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon
LINE
refrigerant oil.
F.
Attach the liquid line assembly to the 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
A. Attach the vapor line sensing bulb in the proper
orientation (illustrated below) using the clamp and
screws provided.
NOTE - Confirm proper thermal contact between vapor
line and expansion valve sensing bulb before insulating
the sensing bulb once installed.
B. Connect the equalizer line from the 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 left.
9 O'CLOCK TO
3 O'CLOCK
BULB
VAPOR LINE
VAPOR LINE
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
FIGURE 8
Page 9
®
rings around the
®
washer around the other
®
ring with
ON LINES SMALLER THAN
7/8",
12
BULB BETWEEN THE 9 AND
BULB
3 O'CLOCK POSITIONS.
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
THE
SENSING
12
BOTTOM OF LINE.
BULB
1/2 Turn
11 12
1
2
10
®
9
3
4
8
7
5
6
1/8 Turn
11 12
1
2
10
9
3
4
8
7
5
6
MOUNT
SENSING
NEVER
MOUNT
BULB
ON
XCZ20 SERIES
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