506694-01
Issue 1720
Page 11 of 16
Installing New Indoor Metering Device
This outdoor unit is designed for use in existing HCFC-22
systems that use either a fixed orifice (RFC) or expansion
valve metering device (purchased separately) at the indoor
coil.
See the 13ACD product specification sheet for approved
fixed orifice sizes and expansion valve kit match ups. The
expansion valve unit can be installed internal or external to
the indoor coil.
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 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.
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
FURTHER DETAILS)
SENSING
LINE
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON
®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.
STUB
END
TEFLON
®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
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
®
rings around the
stubbed end of the 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
®
washer around the other end of the expansion
valve. Lightly lubricate connector threads and expose surface of the
Teflon
®
ring with refrigerant oil.
E
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 20 ft-lb.
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT 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
VAPOR LINE
VAPOR LINE
NOTE — NEVER
MOUNT ON BOTTOM
OF LINE.
BULB
BULB
BULB
VAPOR LINE
FLARE NUT
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
1/8 Turn
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.
INDOOR EXPANSION VALVE
INSTALLATION
TEFLON
®
RING
FIXED ORIFICE
BRASS NUT
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
REMOVE AND DISCARD WHITE
TEFLON
®
SEAL (IF PRESENT)
FIXED ORIFICE (RFC)
DEVICE INSTALLATION
1A
1B
SEE TABLE 3 FOR
INDOOR FIXED
ORIFICE KITS CATALOG
NUMBERS.
Figure 8. Installing Indoor Metering Device
