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WARNING
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or
air conditioning system, use a regulator
that can control the pressure down to 1 or
2 psig (6.9 to 13.8 kPa).
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Fire, Explosion and Personal Safety
hazard. Failure to follow this warning
could result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen, when
result in property damage, personal injury
or death.
WARNING
Polyvinyl ether (PVE) oils used with HFC-410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
Tonnage *
24M
36M
48M
60M
Table 4. Standard Refrigerant Line Set – Up to 50 Linear Feet in Length
31-5000746 Rev. 0
Valve Size Connections
Liquid Line
3/8" (10mm)
The NS23AM is a variable-capacity cooling system
utilizing variable speed compressor technology. With the
variable speed compressor and variable pumping capacity,
additional consideration must be given to refrigerant piping
sizing and application. The guidelines below are to be used
exclusively for the NS23AM systems.
Cooling System (HFC410a)
•
Total equivalent length equals 180 feet (piping and all
NOTE: Length is general guide. Lengths may be more or
less, depending on remaining system design factors.
•
Maximum linear (actual) length = 150 feet.
•
Maximum linear liquid lift = 60 feet.
NOTE: Maximum lifts are dependent on total length,
number of elbows, etc. that contribute to total pressure
drop.
•
Maximum length vapor riser = 60 feet.
•
Up to 50 Linear Feet: Use rated line sizes listed in
Table 4.
•
Between 51 and 150 Linear Feet: Crankcase heater
and nonbleed port TXV factory installed. No additional
components required. Vertical vapor riser must be
sized to the vapor riser listed in Table 5 on systems
with line sets longer than 51 feet. Use Table 5 and
Table 6 to determine the correct liquid and vapor line
sizes.
•
Over 150 Linear Feet: not recommended.
•
Additional oil is not required for systems with line
lengths up to 150 feet.
Suction Traps
For systems with the outdoor unit 5 - 60 feet above the
indoor unit, one trap must be installed at the bottom of the
suction riser.
Suction Line
3/4" (19mm)
7/8" (22mm)
1-1/8" (29mm) **
Page 13
Recommended Line Sets
Line Set Length
30' (9.1m)
40' (12.2m)
50' (15.2m)
Field-fabricated
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