(Mar, 2012)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
2-8
H = Horizontal Run
V = Vertical Run
RECOMMENDED SUCTION LINE SIZES
Model No./
*Equivalent Length Ft.
Total Unit Capacity
50’or less
100’or less
H V
H V
012 /
12,000
5/8
5/8 5/8 5/8
018 /
18,000
7/8
7/8 7/8 7/8
024 /
24,000
7/8
7/8 7/8 7/8
032 /
32,000
7/8
7/8
1-1/8
7/8
040 /
40,000
7/8
7/8
1-1/8
1-1/8
048 /
48,000
1-1/8
1-1/8
1-1/8
1-1/8
048
D
/
48,000
7/8 7/8 7/8 7/8
060 /
60,000
1-1/8
1-1/8
1-1/8
1-1/8
072
D
/
72,000
7/8 7/8 1-1/8 7/8
084
D
/
84,000
1-1/8 1-1/8 1-1/8 1-1/8
120
D
/
120,000
1-1/8 1-1/8 1-1/8 1-1/8
Vertical runs are based on a total rise of 30 equiva-
lent feet. For longer rises, individual calculations
should be made. Sizes assume the use of single
risers; double rises may be necessary.
NOTE
Consult the Copeland applications data guide
for more detailed information regarding refriger-
ant line traps and line sizing.
2.6.1.2.2 Remote Air Cooled Condensing Units
(AHU
Models)
Systems utilizing a remote condensing unit (RCU)
will require a copper liquid line and suction line.
When installing remote condensing units above the
evaporator, the suction line should be p-trapped at
the evaporator.
NOTE
Do not exceed 15 feet of vertical distance
when installing the condensing unit below the
evaporator.
When installing remote condensing units below the
evaporator, the suction line should be trapped with
an inverted trap the height of the evaporator coil. This
prevents migration of liquid refrigerant to the com-
pressor during off cycles.
All suction lines must be insulated to prevent conden-
sation from forming on the pipes. Refer to provided
pipe size charts for recommended pipe sizing.
2.6.2 Chilled Water, Water/Glycol and Hot
Water Reheat Piping
The piping connections for water/glycol, chilled water
and systems with hot water reheat are sweat connec-
tions. Pipe sizes may not necessarily be the same
as the unit connection. Piping should be sized to
match the system pressure drop and pump capac-
ity (if applicable) and may require reducing fi ttings to
match the connection size on the air conditioner. The
recommended ethylene glycol solution ratio is 40%
glycol to 60% water. (SATS recommends Dowtherm
SR1 manufactured by Dow Chemical Co.) Glycol-
cooled systems with a low entering fl uid temperature
and all chilled water systems should have insulated
piping.
WARNING
Glycol is hazardous and the manufacturer’s
MSDS should be consulted.
CAUTION
When installing and fi lling the water/glycol,
chilled water and optional hot water reheat
loop, all air must be bled from the piping
system.
CAUTION
The piping system must be fl ushed prior to op-
erating the system. Failure to do so will result
in equipment problems.
A strainer should be included in the water/glycol,
chilled water and optional hot water reheat line. Once
the system is operational, the fl uid runs through the
strainer where any foreign objects are removed. The
strainer screen should be cleaned periodically.
