SM Split AH/AV Air Handler
SM Split AH/AV Air Handler8733826256 (2020/06)
16 | Refrigerant Lines
Subject to change without prior notice
Connecting Refrigerant Lines
• Use only ACR grade copper tubing and keep
ends sealed until joints are made.
• For best performance, select routing of
refrigerant lines for minimum distance and
fewest number of bends.
• Size lines in accordance with Table 8.
• Cut crimped ends off the air handler suction
and liquid lines. Connect and braze lines to the
air handler.
• Connect and braze lines to service valves on
the condensing section.
Valve Sizing Chart
Table 7 Valve Sizing Chart
Pressurize the refrigerant line set and air handler
to 150lbs with dry nitrogen through the ports
provided on the self service valves. Check line set
and unit connections for leaks.
Once system integrity is verified, evacuate line set
and air handler with a good vacuum pump to 500
microns and hold for half hour.
The air handler is factory supplied with a
holding charge of dry nitrogen.
NOTICE: Always wrap the body of the
service valve with a wet towel or apply some
other form of heat sink prior to brazing and
direct flame away from the valve body.
Failure to do so will result in damage to the
valve. Valve body temperature must remain
below 250°F to protect the internal rubber
“O” rings and seals.
Unit Size Line
Type
Valve
Conn.
Size
Hex
(Allen)
Wrench
Size
SM024/036
Suction 3/4 5/16
SM048/060
Suction 7/8 5/16
ALL
Liquid 3/8 3/16
Pump down must never be used with heat
pumps.
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