Lennox CBX25UHV Series Installation And Service Procedure page 24

PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING
OPERATIONS ON PREVIOUS PAGES 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.
B
REMOVE RUBBER PLUG FROM BOTH LIQUID
AND SUCTION LINES
NOTE - CBX25MV 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.
C EITHER REMOVE OR PUSH PIPE WRAPPING BACK
THROUGH HOLE IN PIPING PLATE BEFORE LINE
SET CONNECTION AND BRAZING.
D
CONNECT PIPES
NOTE - REFRIGERANT LINE SETS
SHOULD BE ROUTED TO ALLOW
FILTER ACCESSIBILITY.
H REPEAT PREVIOUS PROCEDURE
FOR LIQUID LINE.
A
REMOVE ACCESS PANEL
PLACE A WET RAG AGAINST PIPING PLATE
F
AND AROUND THE SUCTION LINE
CONNECTION. A
BRAZE CONNECTION. ALLOW PIPE TO COOL BEFORE
G
REMOVING WET RAG FROM THERMOSTATIC EXPANSION
VALVE WITH AN INTERNAL CHECK VALVE SENSING BULB
AND PIPING PANEL AREA.
Figure 34. Brazing Connections
LOW
E
CONNECT GAUGES AND
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.
REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR
LEAK TESTING, EVACUATING AND CHARGING PROCEDURES
Page 24
PIPING
PLATE
HIGH
NITROGEN