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10
6.3.3 Line Brazing
IOM
IOM
REFRIGERANT LINES MUST BE BRAZED
AND RATED FOR R-410A PRESSURE!
DO NOT REMOVE SERVICE VALVE CAPS
!
DRY NITROGEN SHOULD ALWAYS
BE SUPPLIED THROUGH THE TUBING
WHILE IT IS BEING BRAZED, BECAUSE
THE TEMPERATURE REQUIRED IS HIGH
ENOUGH TO CAUSE OXIDATION OF
THE COPPER UNLESS AN INERT ATMO-
SPHERE IS PROVIDED. THE FLOW OF DRY
NITROGEN SHOULD CONTINUE UNTIL
THE JOINT HAS COOLED. ALWAYS USE
A PRESSURE REGULATOR AND SAFE-
TY VALVE TO INSURE THAT ONLY LOW
PRESSURE DRY NITROGEN IS INTRO-
DUCED INTO THE TUBING. ONLY A SMALL
FLOW IS NECESSARY TO DISPLACE AIR
AND PREVENT OXIDATION.
NEVER ATTEMPT TO REPAIR ANY BRAZED
CONNECTIONS WHILE THE SYSTEM IS
UNDER PRESSURE. PERSONAL INJURY
1. Remove plastic caps from the service valve
connections. Remove the pressure port caps
and valve cores from pressure service ports
(Fig. 13).
2. Install lines into service valve connections
(Fig. 14).
3. Purge the refrigerant line and indoor coil with dry
nitrogen (Fig. 15). Continue to purge until whole
brazing process is complete.
W415-2973 / B / 07.18.22
WARNING
!
WARNING
!
UNTIL SECTION 7.
CAUTION
WARNING
!
COULD RESULT.
13
!
Pressure
Service Port
!
!
14
!
15
Purge Dry
Nitrogen
Pressure Port Cap
Valve Core
Service Valve Cap
IN
Dry
Nitrogen
OUT
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