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FLUSHING LINE SET AND INDOOR COIL (2 OF 2)
4
TYPICAL CHECK EXPANSION VALVE INSTALLATION PROCEDURE
This outdoor unit is designed for use in systems that use check expansion valve metering device. See the Lennox XC17 Engineering Handbook
for approved check expansion valve kit match−ups and application information.
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
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. SENSING BULB INSTALLATION
FOR BULB POSITIONING.
SENSING BULB INSTALLATION
A
Attach the vapor line sensing bulb in the proper orientation
as illustrated to the right using the clamp and screws pro-
vided.
NOTE
Confirm proper thermal contact between vapor line
and check expansion bulb before insulating the sensing bulb
once installed.
B
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 illus-
trated below.
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 in the figure to the right.
B
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 to the right.
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(Uncased Coil Shown)
STUB
LIQUID LINE
CHECK
END
ORIFICE
EXPANSION
HOUSING
VALVE
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
11 12
10
9
8
7
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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 field
servicing of the check expansion valve. Refer to below
illustration for reference during installation of check expansion
valve unit.
TEFLON
RING
A
Remove the field−provided fitting that temporary reconnected the liquid
line to the indoor unit's distributor assembly.
SENSING
B
Install one of the provided Teflon rings around the stubbed end of the
LINE
check expansion valve and lightly lubricate the connector threads and
expose surface of the Teflon ring with refrigerant oil.
C
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
20 ft−lb.
D
Place the remaining Teflon washer around the other end of the check
expansion valve. Lightly lubricate connector threads and expose sur-
face of the Teflon ring with refrigerant oil.
E
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 20 ft−lb.
LIQUID LINE
VAPOR LINE
VAPOR LINE
1/8 TURN
1
2
3
4
5
FLARE SEAL CAP
6
Page 15
10
9
8
ON LINES SMALLER THAN 7/8",
MOUNT SENSING BULB AT
EITHER THE 3 OR 9 O'CLOCK
POSITION.
12
BULB
BULB
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT ON
12
BOTTOM OF LINE.
BULB
BULB
NOTE
NEVER MOUNT ON BOTTOM OF LINE.
OR
MALE BRASS EQUALIZER
LINE FITTING
11 12
1/2 TURN
1
2
3
4
5
7
6
FLARE NUT
COPPER FLARE
SEAL BONNET
VAPOR LINE
XC17 SERIES
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