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PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING
OPERATIONS IN THE BRAZING REFRIGERANT LINES SECTION
BEFORE PROCEEDING.
NOTE - Refer to outdoor unit installation instructions for
refrigerant piping size requirements.
NOTE - Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper-to-copper brazing; 45 percent
alloy for copper-to-brass and copper-to-steel brazing. Do not use
soft solder.
A
REMOVE ACCESS PANEL
ROUTE SUCTION AND LIQUID LINES FROM FITTINGS ON
B
INDOOR COIL TO FITTINGS ON OUTDOOR UNIT. RUN
LINES IN DIRECT PATH, AVOIDING UNNECESSARY TURNS
AND BENDS.
NOTE - MAKE SURE SUCTION LINE IS INSULATED OVER
ENTIRE EXPOSED LENGTH AND NEITHER SUCTION NOR
LIQUID LINES ARE IN DIRECT CONTACT WITH FLOORS,
WALLS, DUCT SYSTEM, FLOOR JOISTS, OR OTHER
PIPING.
C
REMOVE RUBBER PLUG FROM BOTH LIQUID AND
SUCTION LINES
NOTE - NAMP1TA SERIES UNITS USE NITROGEN OR DRY
AIR AS A HOLDING CHARGE. IF THERE IS NO PRESSURE
WHEN THE RUBBER PLUGS ARE REMOVED, CHECK THE
COIL FOR LEAKS BEFORE INSTALLING.
D
EITHER REMOVE OR PUSH PIPE WRAPPING BACK
THROUGH HOLE IN PIPING PLATE BEFORE LINE SET
CONNECTION AND BRAZING.
E
CONNECT PIPES
NOTE - REFRIGERANT LINE
SETS SHOULD BE ROUTED TO
ALLOW FILTER ACCESSIBILITY.
Page 10 of 22
G
PLACE A WET RAG AGAINST PIPING
PLATE AND AROUND THE SUCTION
LINE CONNECTION.
BRAZE CONNECTION. ALLOW PIPE TO COOL
H
TO ROOM TEMPERATURE BEFORE REMOVING
WET RAG FROM CTXV SENSING BULB AND
PIPING PANEL AREA.
REPEAT PREVIOUS PROCEDURE FOR
I
LIQUID LINE.
REINSTALL RUBBER GROMMETS INTO THE
J
REFRIGERANT PIPING PANEL.
NOTE - MAKE SURE EXPANSION VALVE
CAPILLARY TUBE IS NOT TOUCHING METAL
EDGES OR COPPER TUBING.
Figure 10. Brazing Connections
Issue 2336
LOW
CONNECT GAUGES AND
F
START NITROGEN FLOW.
FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG) THROUGH
THE REFRIGERATION GAUGE SET INTO THE VALVE STEM
PORT CONNECTION ON THE OUTDOOR UNIT LIQUID LINE
SERVICE VALVE AND OUT OF THE VALVE STEM PORT
CONNECTION ON THE SUCTION SERVICE VALVE.
NOTE - Refer to instructions provided with outdoor unit
for leak testing, evacuating and charging procedures.
PIPING
PLATE
HIGH
NITROGEN
507787G02 / 31-5000675-1
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