Connecting Refrigerant Lines - Bosch SM Series Installation, Operation And Maintenance Manual

16 | Refrigerant Lines

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.
The air handler is factory supplied with a
holding charge of dry nitrogen.
• Connect and braze lines to service valves on
the condensing section.
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.
Valve Sizing Chart
Unit Size Line
Type
SM024/036 Suction
SM048/060 Suction
ALL Liquid
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.
Pump down must never be used with heat
pumps.
8733826256 (2020/06)
Valve Hex
Conn. (Allen)
Size Wrench
Size
3/4 5/16
7/8 5/16
3/8 3/16
Subject to change without prior notice
SM Split AH/AV Air Handler
SM Split AH/AV Air Handler