(© Oct, 2007)
Air Technology Systems, Inc.
Compact CW Series Installation, Operation & Maintenance Manual
2-7
supplied with your unit for the location of the openings.
Generally, all pipe connections (sweat connections)
terminate inside the unit. Upflow (CCU) units may be
provided with (optional) pipe connections protruding
from the top of the unit.
For pipe connection sizes, refer to the following table:
Field piping is not necessarily the same size as the
unit connections. Piping should be sized to match the
required system pressure drop and flow capacity, and
may require reducing fittings to match the connection
size on the air conditioner. A filling connection and
several shrader valves are installed in the A/C unit.
Refer to the piping diagram supplied with your unit.
CAUTION
When installing and filling the chilled water and/
or hot water loops, all air must be bled from the
piping system and the piping system must be
cleaned prior to operating the system. Failure to
do so could result in equipment problems.
NOTE
All chilled water lines must be insulated to
prevent condensation from forming on the pipes.
2.7.2
Condensate Drain
2.7.2.1 Gravity Drain
A 7/8 inch OD copper (sweat type) line is provided to
drain the condensate pan. An “S” trap is installed at
the end of piping for the installer to connect a 7/8 inch
ID drain line to remove water from the cabinet. This line
also drains the optional humidifier.
NOTE
The humidifier drains (hot) water into the
condensate drain during normal operation.
The drain line must be located so it will not be ex-
posed to freezing temperatures. The diameter of the
drain line should be the full size of the connection.
NOTE
Pour some water into the condensate drain
pan(s) prior to start-up. This fills the trap and
prevents air from being drawn up the drain lines.
2.7.2.2
Condensate Pump
An optional condensate pump is normally factory
installed. The drain connection line may be 1/2” ID
vinyl tubing or a 1/2” O.D. copper (sweat connection)
may be used.
If an optional field installed condensate pump is used,
a p-trap must be installed to allow proper condensate
drainage (see Figure 11). The height of the trap must
be a minimum of 2 inches on standard systems to
ensure proper water drainage. The condensate pump
discharge line should be 1/2 inch O.D. (maximum)
copper pipe to prevent excessive back flow to the
condensate pump.
2.7.3
Humidifier
Compact CW systems utilize an electrode steam
humidifier. The humidifier empties into the condensate
drain line during the flush/drain cycle. A water supply
line must be connected to the ¼ inch O.D. copper
tubing connection supplied by the factory. The humidi-
fier requires normal tap water for the water supply. If
the supply water is high in particulate, an external filter
may be needed. Do not use de-mineralized water.
Refer to the humidifier operator’s manual, supplied with
the equipment, for complete manufacturer’s informa-
tion on the humidifier and the supply water recommen-
dations.
INLET/OUTLET PIPE CONNECTIONS
CW
HW
Model #
(Inches O.D.) (Inches O.D.)
CCU/D-300
1 1/8”
7/8”
CCU/D-600
1 5/8”
7/8”
CCU/D-900
1 5/8”
7/8”
CCU/D-1500
2 1/8”
7/8”
CCU/D-1800
2 1/8”
7/8”
INLET 7/8" OD
OUTLET 1/2" OD
NOTES:
1. MIMIMUM HEIGHT IN INCHES.
2. P-TRAP MUST BE LOCATED IN THE INLET SIDE OF PUMP WHEN FIELD INSTALLED.
2.00
SEE NOTE 1
SEE NOTE 2
Figure 11- Condensate Pump
