Brazing Connections - Lennox Merit Series 13ACX Installation Instructions Manual

1
CUT AND DEBUR
7
INSTALL CORE ONLY FOR
BOTH SERVICE PORTS AFTER
THEY HAVE COOLED.

Brazing Connections

Use the following procedure to braze the line set to the new
air conditioner unit. Figure 14 is provided as a general
guide for preparing to braze the line set to the air
conditioner unit.
WARNING
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.
WARNING
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 un−brazing.
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).
506081−01 09/08
2
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS
SUCTION LINE
INDOOR UNIT
LIQUID LINE
6
BRAZE LINE SET
Figure 14. Brazing Connections
of fire. Bleeding
suction tubing
or air conditioning
3
ATTACH
GAUGES
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
SERVICE
POINT FOR NITROGEN
VALVE
SERVICE
VALVE
5
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations.
ventilated areas.
Wear gloves and protective goggles or face shield
to protect against burns.
Wash hands with soap and water after handling
brazing alloys and flux.
Use the following procedure to braze the line set to the new
air conditioner unit. Figure 14 is provided as a general
guide for preparing to braze the line set to the air
conditioner unit.
1. Cut ends of the refrigerant lines square (free from
the
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
being
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.
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. The TXV metering device at the indoor unit coil
will allow low pressure nitrogen to flow through the
system.)
Page 8
OUTDOOR
UNIT
4
FLOW NITROGEN
WRAP
NITROGEN
SERVICE
VALVE
CAUTION
Perform operations only in well