REFER TO THE CHARTS ON PAGE 8 FOR THE
RECOMMENDED TUBE O.D. SIZES ON LIQUID AND
SUCTION LINES.
Undersized line sets will increase the refrigerant pressure drop
between the indoor evaporator and outdoor unit, resulting in a
decrease in system capacity. Oversizing the line sets may result in
excessive refrigerant charge, thereby making the system more
susceptible to liquid migration.
Condensing units are available with pre-charged, sweat-type copper
connecting fittings.
1. Remove the valve core from the
schrader port. Wrap a wet rag around the
copper stub. Flux the joint and braze with
silphos rod containing at least 10%
silver. DO NOT USE SOFT SOLDER.
Replace the valve core after brazing.
2. Leak-check all braze joints at
approximately 80 psi pressure, purge,
and evacuate the lines. NOTE: DO NOT
USE AIR TO LEAK-CHECK BRAZE
JOINTS. DRY NITROGEN SHOULD BE
USED.
3. This is not a back-seating valve. To open
the valve cap use an adjustable wrench.
To open the valve, insert a hex wrench
(
3
/16" for the liquid line,
5
/16" for the vapor
line) into the stem and back out
counterclockwise until the valve stem
just touches the retaining ring. Do not
over tighten.
4. Replace the valve cap finger-tight, then
tighten an additional
1
/
12 turn or
1
/
2 hex
flat. A metal-to-metal seal is now
complete.
COPPER SUCTION & LIQUID LINES
SWEAT-TYPE CONNECT FITTINGS
6
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