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508133G01 / 31-5000715
Issue 2140
Typical Existing Expansion Valve Removal
Procedure
SENSING
LINE
TWO-PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
STUB END
TEFLON
®
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
Figure 4. Remove Expansion Valve
(Uncased Coil Shown)
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3.
Disconnect the equalizer line from the fitting on the
vapor line.
4. Remove the vapor line sensing bulb.
Tonnage
Line SIze
Total Linear Length (ft.)
25
50
75
100
125
150
-24
3/8”
25
50
60
60
60
60
Max Elevation (ft)
-36
3/8”
25
50
60
56
51
45
1/2”
25
50
60
60
60
60
-48
3/8”
25
50
50
41
31
22
1/2”
25
50
60
60
60
60
-60
3/8”
25
50
36
22
8
NR
1/2”
25
50
60
60
60
59
NOTE: Shaded rows indicate rated liquid line size.
A. Find your tonnage on the left side of the table.
B. Start with the rated liquid line size (shaded row) on the outdoor tonnage.
C. Select the actual Total Linear Length of your system shown at the top of the table.
D. The elevation listed in the table is the maximum allowed for the liquid line listed.
E. Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements.
Table 5. Liquid Line Diameter Selection
Typical Existing Fixed Orifice Removal
Procedure
TEFLON
®
RING
FIXED ORIFICE
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON
®
SEAL
(IF PRESENT)
Figure 3.
Remove Fixed Orifice
(Uncased Coil Shown)
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3.
Using two wrenches (one to hold the orifice housing
and one to remove the brass nut), 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
®
washer, as shown in Figure 3.
5.
Use a field-provided fitting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
