Installing New Indoor Unit Metering Device - Lennox AC13 -018 Installation Instructions Manual

1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly.
3. Disconnect the equalizer line from the TXV equalizer
line fitting on the suction line.
4. Remove the suction line sensing bulb as illustrated in
figure 21.
5. Remove the liquid line from the TXV at the liquid line
assembly.
6. Disconnect the TXV from the liquid line orifice housing.
Take care not to twist or damage distributor tubes
during this process.
7. Remove and discard TXV and the two Teflon rings as
illustrated in figure 21.
8. Use a field−provided fitting to temporary reconnect the
liquid line to the indoor unit's distributor assembly.
Installing New Indoor Metering Device
AC13 units can be configured for use in with HCFC−22
fixed orifice or TXV metering devices. This section
provides instructions on installing either a fixed orifice, or
TXV refrigerant metering device.
1/8 TURN
11 12
1
2
10
9 3
4
8
5
7
6
Figure 22. Tightening Distance
AC13 ENGINEERING HANDBOOK
See the AC13 Engineering Handbook for approved
indoor/outdoor match−ups, applicable fixed orifice and
TXV kits, and application information.
Figures 23 and 24 illustrates the typical RFC and TXV kit
parts and quantities.
506109−01 10/08
1/2 TURN
11 12
1
2
10
9 3
4
8
5
7
6
Figure 23. Fixed Orifice Kit Components
TEFLON
RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 24. TXV Kit Components
TYPICAL FIXED ORIFICE INSTALLATION
PROCEDURE
Use figure 25 to assist in the installation procedure.
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit's liquid
line orifice housing.
2. Ensure that the fixed orifice supplied with the outdoor
unit is installed with the nylon seat pointing toward the
liquid line orifice housing.
3. Apply a small amount of refrigerant oil on the Teflon
washer and insert the Teflon ring securely into the
orifice housing.
4. Attached the liquid line assembly 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 figure 22, or 20 ft−lb.
5. Place the supplied fixed orifice sticker on the indoor
cabinet after installation.
Page 12
FIXED ORIFICE (1)
FIXED ORIFICE EXTRACTOR (1)
TEFLON RING (1)
FIXED ORIFICE STICKER (1)
TXV (1)
HEX HEAD BOLTS
AND NUTS (2)