Lennox CBX32MV Installation Instructions Manual page 10

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.
REMOVE RUBBER PLUG FROM BOTH LIQUID
B
AND SUCTION LINES
NOTE CBX32MV 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.
EITHER REMOVE OR PUSH PIPE WRAPPING BACK
D
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.
I
REPEAT PREVIOUS PROCEDURE FOR LIQUID
LINE.
PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING
OPERATIONS ON PAGE 10 BEFORE PROCEEDING.
USE A WET RAG TO PROTECT CTXV
C
SENSING BULB WHEN BRAZING
SUCTION LINE CONNECTIONS.
A
REMOVE ACCESS PANEL
PLACE A WET RAG AGAINST PIPING
G
PLATE AND AROUND THE SUCTION
LINE CONNECTION. A
BRAZE CONNECTION. ALLOW PIPE TO
H
COOL BEFORE REMOVING WET RAG
FROM CTXV SENSING BULB AND PIPING
PANEL AREA.
Figure 11. Brazing Connections
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.
REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR
LEAK TESTING, EVACUATING AND CHARGING PROCEDURES
Page 10
PIPING
PLATE
HIGH
LOW
NITROGEN