Lennox Elite Series Installation Instructions Manual page 11

Usethefollowing p rocedure tobraze thelinesettothenew
air conditioner unit. Figure18is provided as a general
guidefor preparing to brazethe line set to the air
conditioner unit.
WARNING
WARNÁNG
_WARNING
1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.
2. Remove service cap and core from both the suction
and liquid line service ports.
3. Connect gauge low pressure side to liquid line 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.
5. 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.
NOTE - The RFCIV or TXV metering device at the indoor
unit will allow low pressure nitrogen to flow through the
system.)
NO TE - Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper-to-copper brazing or 45
percent silver alloy for copper-to-brass or copper-to-steel
brazing.
6, Braze the liquid line to the liquid line service valve.
Turn off nitrogen flow. Repeat procedure starting at
paragraph 4 for brazing the suction line to the suction
service valve.
7, After all connections have been brazed, disconnect
manifold gauge set the from service ports and remove
wrapping. Reinstall the service port core for both of the
outdoor unit's service valves,
Remove the existing HCFC-22 refrigerant flow control
orifice or thermal expansion valve 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 parts are necessary for the indoor unit,
order kit 69J46. The kit includes:
• 10 -- Brass nuts for liquid line assemblies
• 20 -- Teflon rings
• 10 -- Liquid line orifice housings
• 10 -- Liquid line assemblies
PISTON
LIQUID LINE ORIFICE HOUSINGS (10) / RETAINER
TEFLON RINGS (20)
..(_J jBRASS NUTS (10) _
--/"1 . STRANE
,, O%ER
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10) LIQUID LINE
ASSEMBLY
Figure 19.69J46 Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
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 washer as illustrated in
figure 20.
Page 11
XP16 SERIES