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506238−01 06/09
3
ATTACHED GAUGES
OUTDOOR
UNIT
LIQUID LINE
SUCTION LINE
LIQUID LINE SERVICE
VALVE
SUCTION LINE
SERVICE
VALVE
ATTACH GAUGES
INDOOR UNIT
SERVICE PORT MUST BE OPEN TO ALLOW EXIT
POINT FOR NITROGEN
A
Connect gauge set low pressure side to liquid line service valve.
B
Connect gauge set center port to bottle of nitrogen with regulator.
NITROGEN
A
B
HIGH
LOW
USE REGULATOR TO
FLOW NITROGEN AT 1
TO 2 PSIG.
4
5
WRAP SERVICE VALVE
FLOW NITROGEN
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.
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 fixed orifice or CTXV metering
device at the indoor unit will allow low pressure
nitrogen to flow through the system.
NITROGEN
HIGH
LOW
USE REGULATOR
TO FLOW
NITROGEN AT 1
TO 2 PSIG.
6
7
BRAZE LINE SET
INSTALL SERVICE PORT CAPS ONLY
Braze the liquid line to the liquid line service
valve. Turn off nitrogen flow.
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.
IMPORTANT − Repeat procedure starting at paragraph 4 for brazing
the suction line to service port valve.
SERVICE PORT
CORE
SERVICE
PORT CAP
SERVICE PORT
WARNING
! Allow braze joint to cool before removing the wet rag
from the service valve. (TEMPERATURES ABOVE 250ºF CAN
DAMAGE VALVE SEALS.
