Lennox Dave Signature Collection XC15 Installation Instructions Manual page 10

1
CUT AND DEBUR
7
INSTALL CORE ONLY FOR
BOTH SERVICE PORTS AFTER
THEY HAVE COOLED.
BRAZING CONNECTION PROCEDURE
Before brazing, remove the access panel as illustrated in
figure 13; then remove the narrow piping panel to prevent
burning off the paint as illustrated in figure 20.
LINE SET
CONNECTION
POINTS.
Figure 20. Piping Panel Removal
WARNING
When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).
506044−01 06/08
2
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN
SUCTION LINE
INDOOR UNIT
LIQUID LINE
6
BRAZE LINE SET
Figure 19. Brazing Connections
REMOVE 2 SCREWS
AND REMOVE PANEL
BEFORE BRAZING.
PIPING
PANEL
or air conditioning
3
ATTACH
GAUGES
SERVICE
VALVE
SERVICE
VALVE
5
FLOW NITROGEN
Polyol ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept
closed as much as possible. DO NOT remove line
set caps or service valve stub caps until you are
ready to make connections.
Danger
refrigerant charge from only the high
side may result in the low side shell
and
pressurized. Application of a brazing
torch while pressurized may result in
ignition of the refrigerant and oil
mixture − check the high and low
pressures before unbrazing.
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 HFC−410A sticker.
Page 10
OUTDOOR
UNIT
4
WRAP
NITROGEN
SERVICE
VALVE
WARNING
WARNING
of fire. Bleeding
suction tubing
the
being