Page 8
STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve
This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or
expansion valve metering device (purchased separately) at the indoor coil. The 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 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. After installation of the indoor coil metering device,
proceed to
Step 5.
TWO-PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
SUCTION
LINE
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID LINE
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
DETAILS)
SENSING
LINE
EQUALIZER
LINE
CHECK/
EXPANSION
VALVE
TEFLON
®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
check/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
SUCTION LINE
SUCTION LINE
NOTE
— NEVER MOUNT SENSING BULB ON BOTTOM OF LINE.
BULB
BULB
BULB
SUCTION LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
SENSING BULB INSTALLATION
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 suc
tion line as illustrated in the figure below.
B -
Remove the field-provided fitting that temporarily reconnected
the liquid line to the indoor unit's distributor assembly.
INDOOR EXPANSION VALVE INSTALLATION
C -
Install one of the provided Teflon
®
rings around the
stubbed end of the check/expansion valve and use re
frigerant oil to lightly lubricate the connector threads
and exposed surface of the Teflon
®
ring.
D -
Attach the stubbed end of the check/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.
E -
Place the remaining Teflon
®
washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon
®
ring with refrigerant oil.
F -
Attach the liquid line assembly to the check expansion
valve. Finger tighten, then use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as illus
trated in the figure above or tighten to 20 ft-lb.
A -
Attach the suction line sensing bulb in the proper orien
tation as illustrated below using the clamp and screws
provided.
NOTE
- Though it is preferred to have the sensing bulb
installed on a horizontal run of the suction line, installation on
a vertical run of piping is acceptable if necessary.
NOTE
- Confirm proper thermal contact between the suction
line and check/expansion bulb before insulating the sensing
bulb.
B -
Connect the equalizer line from the check/expansion
valve to the equalizer port on the suction line. Finger
tighten the flare nut, then tighten an additional 1/8 turn (7
ft-lbs) as illustrated to the right.
1
2
3
4
5
6
7
8
9
10
11
12
1/8 Turn
1
2
3
4
5
6
7
8
9
10
11 12
1/2 Turn
FIGURE 8