Installing New Indoor Metering Device - Lennox Elite XP16−024−230 Installation Instructions Manual

Installing New Indoor Metering Device

This outdoor unit is designed for use in HFC−410A systems that use a check / expansion valve metering device (purchased
separately) at the indoor coil.
See the Lennox XP16 Engineering Handbook for approved check / expansion valve kit match−ups. The check / expansion
valve device can be installed either 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 (see figure 11).
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
required if mounted external to
the coil casing.
EQUALIZER LINE INSTALLATION
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.
FLARE SEAL CAP
STUB
CHECK /
END
EXPANSION
VALVE
TEFLON
RING
®
TEFLON
SENSING
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
LIQUID LINE
is
FLARE NUT
COPPER FLARE
OR
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
Figure 11. Installing Indoor Check / Expansion Valve
A Remove the field−provided fitting that temporarily
reconnected the liquid line to the indoor unit's distributor
assembly.
B 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.
®
C 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 20 ft−lb.
D Place the remaining Teflon
end of the check / expansion valve. Lightly lubricate
LINE
connector threads and expose surface 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.
SENSING BULB INSTALLATION
A Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE Confirm proper thermal contact between vapor line
and 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 illustrated
below.
VAPOR LINE
BULB
VAPOR LINE
BULB
NOTE NEVER MOUNT ON BOTTOM OF LINE.
Page 15
®
rings around the
®
washer around the other
ON LINES SMALLER THAN
7/8", MOUNT
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
12
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
1/2 Turn
11 12
1
2
10
9 3
4
8
5
7
6
®
1/8 Turn
11 12
1
2
10
9 3
4
8
5
7
6
SENSING
XP16 SERIES