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Typical Existing Fixed Orifice Removal
Procedure
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON
(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
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
TWO-PIECE PATCH PLATE
LIQUID LINE
(UNCASED COIL ONLY)
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
Figure 4. Remove Expansion Valve
(Uncased Coil Shown)
508311G01 / 31-5000754
®
TEFLON
RING
FIXED ORIFICE
BRASS NUT
®
SEAL
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
washer, as shown in Figure 3.
®
STUB END
EXPANSION
VALVE
TEFLON
RING
®
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
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
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
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
VALVE
RECOVERY
CYLINDER
4
®
1.
Cylinder with clean R-410A (positioned to deliver liquid
refrigerant) to the vapor service valve.
SENSING
LINE
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.
LIQUID
LINE
Issue 2250
rings.
®
CYLINDER CONTAINING
CLEAN R-410A TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
1
refrigerant)
1
NEW
OUTDOOR
UNIT
2
3
Figure 5. Connecting Gauges
GAUGE
MANIFOLD
LOW
HIGH
OPENED
CLOSED
TANK
RETURN
INLET
DISCHARGE
RECOVERY MACHINE
Page 7 of 26
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