508296-G01 / 31-5000753
Page 7 of 24
Issue 2231
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 4.
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 4.
5.
Use a field-provided fitting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
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 5. 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.
5. Disconnect the liquid line from the expansion valve at
the liquid line assembly.
6. Disconnect the expansion valve from the liquid line
orifice housing. Take care not to twist or damage
distributor tubes during this process.
7. Remove and discard expansion valve and the two
Teflon
®
rings.
8.
Use a field-provided fitting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orifice housing.
Connect Gauges and Equipment for Flushing
Procedure
LOW
HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
CYLINDER CONTAINING
CLEAN R-410A TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
VAPOR
LIQUID
1
1
2
3
4
Figure 6. Connecting Gauges
1. Cylinder with clean R-410A (positioned to deliver liquid
refrigerant) to the vapor service valve.
2. Refrigerant gauge set (low side) to the liquid line valve.
3. Refrigerant gauge set center port to inlet on the
recovery machine with an empty recovery tank
connected to the gauge set.
4. Connect recovery tank to recovery machine per
machine instructions.
