Removing Indoor Unit Metering Device - Lennox Elite XC13 Installation Instructions Manual

WRAP SERVICE VALVE
4
To protect components during brazing, wrap a wet cloth around the liquid
line service valve body and copper tube stub and use another wet cloth
underneath the valve body to protect the base paint. Also, shield the light
maroon R−410A sticker.
6
BRAZE LINE SET
Braze the liquid line to the liquid line service valve. Turn off nitrogen flow.
IMPORTANT − Repeat procedure starting at paragraph 4 for brazing
the suction line to service port valve.

Removing Indoor Unit Metering Device

Remove the existing HCFC−22 fixed orifice or TXV from
the indoor coil. The existing indoor unit HCFC−22 metering
device is not approved for use with HFC−410A refrigerant
and may prevent proper flushing.
REPLACEMENT PARTS
If replacement liquid line parts are necessary for the indoor
unit, order kit 69J46 (LB−95325A). The kit includes:
LIQUID LINE ORIFICE HOUSINGS (10)
TEFLON RINGS (20)
BRASS NUTS (10)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
Figure 17. Liquid Line Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
Use the following procedure to remove the indoor unit's
fixed orifice and install a temporary field provided fitting.
PISTON
RETAINER
STRAINER
COPPER
TUBE
LIQUID LINE
ASSEMBLY
Page 11
FLOW
5
NITROGEN
NOTE − The fixed orifice or TXV metering device at the
indoor unit will allow low pressure nitrogen to flow through
the system.
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge
set into the valve stem port connection on the liquid line service valve
and out of the valve stem port connection on the suction service valve.
7
INSTALL SERVICE PORT CAPS ONLY
SERVICE PORT
After all connections have been brazed, disconnect manifold gauge
set from service ports, cool down piping with wet rag and remove all
wrappings. Do not reinstall cores until after evacuation procedure.
Reinstall service caps if desired to close off refrigerant ports.
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
TEFLON RING
DISTRIBUTOR
ASSEMBLY
REMOVE AND
DISCARD
WHITE TEFLON SEAL
(IF PRESENT)
Figure 18. 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.
FLOW
NITROGEN
SERVICE PORT
CORE
SERVICE PORT
CAP
(Uncased Coil Shown)
FIXED
ORIFICE
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
XC13 SERIES