Stulz FLAIR series, Installation, Operation And Maintanance Manual

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(©Aug, 2007)
FLAiR Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
2-5
NOTE
Consult the Copeland applications data guide
for more detailed information regarding refriger-
ant line traps and line sizing.
2.6.2.1 Remote Air Cooled Condensers (AR)
If the condenser is installed above the evaporator, the
discharge line should include a P-trap at the evapora-
tor.
If the condenser is installed below the evaporator, an
inverted trap the height of the evaporator coil is
required on the liquid line to help prevent oil and liquid
from flooding back to the compressor during off
cycles.
2.6.2.2 Remote Air Cooled Condensing Units
(AHU)
When installing remote condensing units above the
evaporator, the suction line should be p-trapped at the
evaporator. When installing remote condensing units
below the evaporator, the suction line should be
trapped with an inverted trap the height of the evapora-
tor coil. This prevents migration of liquid refrigerant to
the compressor during off cycles.
All suction lines must be insulated to prevent conden-
sation from forming on the pipes.
2.6.2 Water/Glycol
The piping connections for water/glycol condensers
are sweat connections. Pipe sizes may not necessar-
ily be the same size as the unit connection. Piping
should be sized to match the system pressure drop
and capacity and may require a reducing fitting to
match the connection size on the air conditioner.
Glycol-cooled systems with low entering fluid tempera-
tures should have insulated piping.
The recommended ethylene glycol solution ratio is 40%
glycol to 60% water. (SATS recommends Dowtherm
SR1 manufactured by Dow Chemical Co.) Use only
ethylene glycol with inhibitors for corrosion protection.
WARNING
Glycol is hazardous. Consult the manufacturer's
MSDS for detailed safety information.
NOTE
When installing and filling the water/glycol loop
all air must be bled from the piping system.
*
Equivalent Ft. accounts for the linear pipe length as well as equivalent
length of Valves, Elbows and Tee’s shown in the previous chart.
Recommended Discharge Line Sizes
(For R22 or R407C Refrigerant)
Model No./ Equivalent Length Ft*
Total Unit
50' 100' 150'
BTU/Hr Capacity
or less or less or less
018 / 18,000 5/8 5/8 5/8
024 / 24,000 5/8 7/8 7/8
036 / 36,000 7/8 7/8 7/8
042 / 42,000 7/8 7/8 7/8
048 / 48,000 7/8 7/8 7/8
060 / 60,000 7/8 1-1/8 1-1/8
Recommended Suction Line Sizes
(For R22 or R407C Refrigerant)
Model No./ Equivalent Length Ft*
Total Unit 50' or less 100' or less
BTU/Hr Capacity H V H V
018 / 18,000 7/8 7/8 7/8 7/8
024 / 24,000 7/8 7/8 7/8 7/8
036 / 36,000 7/8 7/8 1-1/8 7/8
042 / 42,000 1-1/8 1-1/8 1-1/8 1-1/8
048 / 48,000 1-1/8 1-1/8 1-1/8 1-1/8
060 / 60,000 1-1/8 1-1/8 1-1/8 1-1/8
H=Horizontal run V= Vertical Run
*
Equivalent Ft. accounts for the linear pipe length as well as equivalent
length of Valves, Elbows and Tee’s shown in the previous chart.
Vertical runs are based on a total rise of 30 equivalent
feet. For longer rises, individual calculations should be
made. Sizes assume the use of single risers; double
rises may be necessary.