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