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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 EL22XPV Product Specications bulletin (EHB) for approved expansion valve kit match-ups
and application information. The expansion valve unit can be installed internal or external to the indoor coil. In applica-
tions where an uncased coil is being installed in a eld-provided plenum, install the expansion valve in a manner that will
provide access for future eld service of the expansion valve. Refer to below illustration for reference during installation
of expansion valve unit.
1 - Attach the vapor line sensing bulb in the proper
orientation as illustrated belowusing
provided.
NOTE - Though it is preferred to have the sensing bulb
installed on ahorizontal run of the vapor line, installation
on a vertical run of piping is acceptable if necessary.
See figure to right for proper bulb orientation on vert-
ical run of piping.
NOTE - Confirm proper thermal contact between vapor
line and check/expansion bulb before insulating the
sensing bulb once installed.
the equalizer vapor port on the vapor line. Finger
the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
2 - Connect the equalizer line from the check expansion
valve to
tighten
to the right.
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
FURTHERDETAILS)
SENSING
LINE
EQUALIZER
LINE
CHECK
EXPANSION
VALVE
TEFLON
®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
mountedexternal to the coil casing. sensing
bulb installation for bulb positioning.
STUB
END
TEFLON
®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
3 - Install one of the provided Teflon
®
rings around the
stubbed endofthe check expansion valve and lightly
lubricate the connector threads andexpose surface of
the Teflon
®
ring with refrigerant oil.
4 - Attachthe stubbed end of the check expansion valve to
the liquid line orifice housing.Finger tighten and use an
appropriatelysized 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 Te flon
®
washer around theother
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon
®
ring with refrigerant oil.
6 - Attachthe liquid line assembly to the check expansion
valve.Fingertighten and use an appropriately sized
wrenchto turn an additional 1/2 turn clockwise as
illustrated in the figure above or tighten to 20 ft-lb.
ON 3/4" ANDLARGERLINES, MOUNT SENSING BULB AT
EITHER THE 3 OR 9 O’CLOCK POSITION.
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
VAPOR LINE
FLARENUT
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
1/8Turn
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 thefield-provided
sembly.
INDOOR EXPANSION VALVE INSTALLATION
the clamp and screws
ON LINES SMALLER THAN 3/4", MOUNT SENSING BULB AT
EITHER THE 1 OR 11 O’CLOCK POSITION.
FIGURE 8
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