SM Split CS Series Heat Pump
SM Split CS Series Heat Pump
8733825873 (2020/05)
10
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Refrigerant Lines
Subject to change without prior notice
•
Connect and braze lines to service valves on
the condensing section.
Valve Sizing Chart
Table 1 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.
Refrigerant Charge, Line Sizing, and Capacity Multiplier Chart
Table 2 Refrigerant Charge, Line Sizing, and Capacity Multiplier Chart
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.
System
Models
Factory
R410A
Charge
(Oz)*
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
Suction
Line
Riser
Max.
25 FT.
36 FT.
45 FT.
50 FT.
75 FT.
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
SM024
80
3/8
3/4
3/8
3/4
3/8
3/4
3/8
3/4
3/8
7/8
3/4
SM036
86
3/8
3/4
3/8
3/4
3/8
3/4
3/8
7/8
3/8
7/8
3/4
SM048
88
3/8
7/8
3/8
7/8
3/8
7/8
3/8
7/8
3/8
7/8
7/8
SM060
115
3/8
1–1/8
3/8
1–1/8
3/8
1–1/8
3/8
1–1/8
3/8
1–1/8
7/8
CAPACITY MULTIPLIER
1.00
0.995
0.990
0.990
0.980
EXAMPLE 1:
Model SM036 with 45 ft. of equivalent length of 3/8” O.D.
Liquid Line.
Total System Charge= Factory (45 ft. - 25 ft.) x .60
oz./ft.
Total System Charge = 93 oz. + (20 ft. x .60 oz./ft.) = 105 oz.
Additional 12 oz. of R410A refrigerant required.
EXAMPLE 2:
Model SM060 with 10 ft. of equivalent length of 3/8” O.D.
Liquid Line.
Total system charge= Factory (25 ft. -10 ft.) x .60 oz./ft.
Total System Charge = 150 oz. + (15 ft. x .60 oz./ft.) = 141 oz.
Additional 12 oz. of R410A refrigerant required.
