Lennox 14HPX-018 Installation Instructions Manual page 7

ANCHORED
HEAVY NYLON
WIRE TIE
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD
WALL
STUD
Strap Liquid
Line To Va- Strap Liquid Line
por Line To Vapor Line
)UID LINE
LIQUID LINE
METAL VAPOR LINE - WRAPPED METAL VAPOR LINE - WRAPPED
SLEEVE IN ARMAFLEX SLEEVE IN ARMAFLEX
Figure 9. Refrigerant Line Sets: Transition From Vertical To Horizontal
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
8 feet
WIRE TIE
(Around vapor line only)
STRAPPING MATERIAL
(Around vapor line only)
feet
METAL FLOOR JOIST OR
SLEEVE ROOF RAFTER
TAPE OR WIRE TIE H
\
TAPE OR WIRE TIE
Strap the vapor line to the joist or
rafter at 8 ft, intervals then strap
the liquid line to the vapor line.
Figure 10. Refrigerant Line Sets: Installing Horizontal Runs
WARNING
BRAZING CONNECTION PROCEDURE
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. Flow dry nitrogen through the refrigerant piping while
making line set connections; this prevents carbon de-
posits (oxidation) buildup on the inside of the joints be-
ing brazed. Such buildup may restrict refrigerant flow
through screens and metering devices. To do this:
.
.
• Flow_ulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the Schrader port con-
nection on the vapor service valve and out of the
Schrader port connection on the liquid service
valve. (Metering device [TXV and RFC] will allow
low pressure nitrogen to flow through the system.)
• While nitrogen is flowing, braze refrigerant line set
to the indoor and outdoor units. IMPORTANT: The
flow of nitrogen must have an escape path
other than through the joint to be brazed.
Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper-to-copper brazing or 45 percent
silver alloy for copper-to-brass or copper-to-steel
brazing) which are rated for use with HFC-410A refrig-
erant.
Wrap a wet cloth around the valve body and copper
tube stub to protect it from heat damage during braz-
ing. Wrap another wet cloth underneath the valve body
to protect the base paint.
Page 7
14HPX SERIES