Installing Indoor Metering Device - Lennox SSB036H4S4 Installation Instructions Manual

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use a
expansion valve metering device at the indoor coil.
See the Lennox SSB*H4 Product Specification bulletin for
approved expansion valve kit match-ups. The expansion
valve unit can be installed either internal or external to the
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. sensing
bulb installation for 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 in the figure to the right.
B Remove the field-provided fitting that temporarily recon­
nected the liquid line to the indoor unit's distributor assem­
bly
FLARE SEAL CAP
507163-01 05/13
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
Figure 11. Installing Indoor Expansion Valve
indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the expansion
valve in a manner that will provide access for field servicing
of the expansion valve. Refer to below illustration for
reference during installation of expansion valve unit.
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 as illustrated to the right 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.
9 O'CLOCK TO
3 O'CLOCK
BULB
VAPOR LINE
VAPOR LINE
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
Page 16
®
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
5
7
6
1/8 Turn
11 12
1
2
10
9 3
4
8
5
7
6
MOUNT SENSING
NEVER MOUNT
BULB ON