Lennox CBA25UHV-018 Unit Information page 23

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 — CBA25UHV 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.
I
REPEAT PREVIOUS PROCEDURE FOR LIQUID
LINE.
PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING
OPERATIONS BEFORE PROCEEDING.
C
USE A WET RAG TO PROTECT CTXV
SENSING BULB WHEN BRAZING
SUCTION LINE CONNECTIONS.
.
A
REMOVE ACCESS PANEL
G
PLACE A WET RAG AGAINST PIPING
PLATE AND AROUND THE SUCTION
LINE CONNECTION. A
H
BRAZE CONNECTION. ALLOW PIPE TO
COOL BEFORE REMOVING WET RAG
FROM CTXV SENSING BULB AND PIPING
PANEL AREA.
FIGURE 20. 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 POR T CONNECTION ON THE OUTDOOR
UNIT LIQUID LINE SER VICE 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 23
HIGH
LOW
NITROGEN