Installation
AH-SVX008C-EN
19
Suction line sizes are for 50ºF through 30ºF suction temp at
48 through 26 psig.
Important:
Do not exceed the maximum line lengths
for the system configurations listed below:
•
RCU with hot gas bypass 50 ft
•
Remote condensing unit 100 ft
•
Remote air cooled condenser 150 ft
•
Vertical runs are based on a total rise of 30 equivalent
ft. For longer rises, individual calculations should be
made. Sizes assume the use of single risers; double
rises may be necessary.
Remote Air Cooled Condensers (AR Models)
Systems utilizing air cooled condensers must not have a
refrigerant line pressure drop over 14 psig across the
condenser and the interconnecting piping to the
condenser sections.
Note:
Ensure proper condenser selection to maintain
reasonable sub-cooling temperatures.
If the condenser is installed above the evaporator, the
discharge line should include a P-trap at the lowest point in
the piping. The highest point in the discharge line should
be above the condenser coil and should include an
inverted trap to help prevent oil and liquid from flooding
back to the compressor during off cycles.
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.
Refer to the refrigerant-appropriate Recommended
Discharge Line Sizes
, Recommended Liquid
Line Sizes
Sizes
.
Remote Air Cooled Condensing Units (AHU
Models)
When installing a remote condensing unit 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 same height as the evaporator coil. This
prevents migration of liquid refrigerant to the compressor
during off cycles.
Note:
Do not exceed 15 ft of vertical distance when
installing the condensing unit below the
evaporator.
All suction lines must be insulated to prevent
condensation from forming on the pipes. Refer to the
Recommended Suction Line and Recommended Liquid
Line sizing tables.
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 connections. Pipe
sizes may not necessarily be the same as the unit
connection. Piping should be sized to match the required
system pressure drop and pump capacity (if applicable)
and may require reducing fittings to match the connection
size on the air conditioner.
NOTICE
Equipment Damage
Fluid coils and associated piping circuits are
pressurized and sealed when they leave the factory.
When installing and filling water/glycol, chilled water
and optional hot water reheat loops, all air must be
bled from the piping system.
The piping system must be flushed prior to operating
the system. Failure to do so will result in equipment
problems.
The recommended ethylene glycol solution ratio is 40%
glycol to 60% water. Glycol-cooled systems with a low
entering fluid temperature and all chilled water systems
should have insulated piping.
WARNING
Hazardous Chemical!
Glycol is a colorless, thick, odorless liquid. When
heated or misted, it can cause: throat irritation, eye
irritation, headache, and in extreme cases can lead to a
coma and fatality. Chronic exposure in large doses can
cause pulmonary and kidney issues.
A strainer should be included in the water/glycol, chilled
water and optional hot water reheat line. Once the system
is operational, the fluid runs through the strainer, which
removes any foreign objects. The strainer screen should
be cleaned periodically.
Condensate Drain Line
Gravity Drain
A 7/8 in. O.D. copper (sweat type) line is provided to drain
the condensate drain pan. This line also drains the
humidifier, if applicable. A "P" type condensate trap must
be installed. The height of the trap must be at least 2 inche
to exceed the total static pressure of the system and
ensure proper water drainage from the drain pan. The
120D / 120,000
1-1/8
1-1/8
1-1/8
1-1/8
Table 5.
Recommended suction line sizes for R407C
refrigerant (continued)
Model No./
Total Btu/h
Capacity
Line O.D. (in.)
50 ft
or less
100 ft
or less
H
V
H
V
Summary of Contents for CeilAir CW
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