Removing Indoor Unit Metering Device; Installing New Indoor Unit Metering Device - Lennox Merit Series13ACD Installation Instructions Manual

Removing Indoor Unit Metering Device

Remove the existing HCFC−22 refrigerant flow control
orifice or thermal expansion valve from the indoor coil.
REPLACEMENT PARTS
If replacement parts are necessary for the indoor unit,
order kit 69J46. The kit includes:
S
10 Brass nuts for liquid line assemblies
S
20 Teflon rings
S
10 Liquid line orifice housings
S
10 Liquid line assemblies
LIQUID LINE ORIFICE HOUSINGS (10)
TEFLON RINGS (20)
BRASS NUTS (10)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
Figure 14. 69J46 Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
TEFLON RING
DISTRIBUTOR
ASSEMBLY
VALVE STEM
VALVE STEM CAP
Figure 15. Typical Fixed Orifice Removal
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. Using two wrenches, disconnect liquid line from liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.
4. Remove and discard fixed orifice, valve stem
assembly if present and Teflon ring as illustrated in
figure 15.
PISTON
RETAINER
STRAINER
COPPER
TUBE
LIQUID LINE
ASSEMBLY
REMOVE AND DISCARD
VALVE STEM ASSEMBLY
FIXED
(IF PRESENT)
ORIFICE
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
(Uncased Coil Shown)
TYPICAL TXV REMOVAL PROCEDURE
(Uncased Coil Shown)
TWO PIECE
PATCH PLATE
(UNCASED COIL LIQUID LINE
ONLY)
ORIFICE HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING
SENSING BULB
Figure 16. Typical TXV Removal
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 16.
5. Disconnect 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 16.
Installing New Indoor Unit Metering
Device
13ACD 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.
11 12
10
9
8
7
6
Figure 17. Tightening Distance
Page 9
STUB END
TXV
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
1/8 TURN
11 12
1
10
2
9
3
4 8
7
5
6
TEFLON
RING
SENSING
LINE
LIQUID
LINE
1/2 TURN
1
2
3
4
5
13ACD SERIES