Page 9
XC25 SERIES
STEP 3 -- INSTALLING INDOOR EXPANSION VALVE
This outdoor unit is designed for use in systems that include an expansion valve metering device. See the
XC25
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 will provide access for future field service of the expansion valve.
Refer to below illustration for reference during installation of expansion valve.
TWO-PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
VAPOR
LINE
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID LINE
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
DETAILS)
SENSING
LINE
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON
®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
expansion valve is installed external to the
coil casing. See sensing bulb installation for
bulb positioning.
STUB
END
TEFLON
®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
12
BULB
VAPOR LINE
VAPOR LINE
NOTE — NEVER MOUNT THE SENSING
BULB ON BOTTOM OF LINE.
BULB
BULB
BULB
VAPOR LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
1
2
3
4
5
6
7
8
9
10
11 12
1/2 Turn
SENSING BULB INSTALLATION
EQUALIZER LINE INSTALLATION
1
2
3
4
5
6
7
8
9
10
11 12
1/8 Turn
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.
INDOOR EXPANSION VALVE INSTALLATION
3.
Install one of the provided Teflon
®
rings around the
stubbed end of the expansion valve and use refrigerant
oil to lightly lubricate the connector threads and ex
posed surface of the Teflon
®
ring.
4.
Attach the stubbed end of the expansion valve to the
liquid line orifice housing. Finger tighten, then use an
appropriately sized wrench to turn an additional 1/2
turn clockwise as illustrated in the figure to the right, or
tighten to 20 ft-lb.
5.
Place the remaining Teflon
®
washer around the other
end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon
®
ring with
refrigerant oil.
6.
Attach the liquid line assembly to the expansion valve.
Finger tighten, then 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.
1.
Attach the vapor line sensing bulb in the proper orienta
tion as illustrated below using the clamp and screws
provided.
2.
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 expansion bulb before insulating the sensing bulb.
3.
Connect the equalizer line from the expansion valve to
the equalizer vapor port on the vapor line. Finger tighten
the flare nut, then tighten an additional 1/8 turn (7 ft-lbs)
as illustrated to the right.
FIGURE 6
