AEC Econo-Cool Chillers - Manual (Page 19)

Page 18 AEC Water Temperature Control Units
Note: Use a backup wrench to support Economical Series system piping when making
process piping connections.
!
CAUTION
All external valves, fittings, and hoses must be rated at a minimum of
150 psig and 250
°F (1,034.25 kPa/10.34 bars and 121ºC).
The exception is when the temperature control unit
is optionally rated for 300ºF (149ºC) operation;
external valves fittings and hoses must then be rated at a minimum of
150 psig and 300ºF (1,034.25 kPa/10.34 bars and 121ºC).
3-4 Piping Considerations for Permanent
Installations
We recommend an optional (or customer-installed) strainer on the COOLING WATER
IN inlet.
The unit must have at least 16 psig (110.32 kPa/1.1 bars) water supply pressure to
prevent pump cavitation that can be caused by the water “flashing” to steam. To avoid
damage to the pump or other components, make sure that maximum supply pressure
does not exceed 75 psig (517.1 kPa/5.17 bars).
Keep restrictions to a minimum by using proper inlet pipe sizing. If the water supply
piping is larger than ¾”, reduce the size at the unit. The table below contains the pipe
sizes that are used in the unit.
Pipe sizes for ¾ hp to 7.5 hp (0.56 kW to 5.59 kW) units
Location Size in inches NPT
To Process 1½”
From Process 1½”
Cooling Water In ¾”
Cooling Water Out - depends on solenoid used -
Common black pipe is recommended for permanent installations. Economical Series
water circuit piping is primarily ferrous (iron) and reacts electro-chemically with non-
ferrous metallic materials such as copper. Some water contains dissolved minerals that
greatly accelerate the reaction between dissimilar metals. Ferrous piping is
recommended to minimize galvanic action. If piping must be copper, use dielectric
unions at the unit.