Lennox Merit CBA25UHE Installation Instructions Manual page 12

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.
A
REMOVE ACCESS PANEL
B
REMOVE RUBBER PLUG FROM BOTH LIQUID
AND SUCTION LINES
NOTE - CBA25UH 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.
F
PLACE A WET RAG AGAINST PIPING
PLATE AND AROUND THE SUCTION
LINE CONNECTION.
G
BRAZE CONNECTION. ALLOW PIPE TO
COOL BEFORE REMOVING WET RAG
FROM CTXV SENSING BULB AND PIPING
PANEL AREA.
H
REPEAT PREVIOUS PROCEDURE FOR LIQUID
LINE.
FIGURE 10. Brazing Connections
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 12
PIPING
PLATE
HIGH
LOW
NITROGEN