AEC Econo-Cool Chillers - Manual (Page 29)

Page 28 AEC Water Temperature Control Units
Low Pressure Cutout Switch
This switch, set at 16 psig with a 2 psig differential (110.3 kPa/ 1.10 bars with a 13.79
kPa/0.14 bars differential) shuts down the unit if the
COOLING WATER IN water
pressure drops below 16 psig (110.3 kPa/1.10 bars). For the 300 °F (148.9 °C) option,
this switch is set at 55 psig with a 2 psig differential (379.2 kPa/ 3.79 bars).
Pumps
Pumps range in power from ¾ hp to 7.5 hp (0.56 kW to 5.59 kW) and are equipped
with 3-phase ODP motors and seal flush lines as standard.
The pump is a bronze-fitted close-coupled centrifugal type. It features a split case
design to facilitate replacement of the seal. It has a high output capacity with excellent
discharge pressure helping it facilitate turbulence to maximize heat transfer, and is well
suited for the conditions under which it was designed to operate.
Heaters
The specially designed 9 kW three-phase low watt density electrical immersion heater
heats the water, and the controller regulates the temperature. The standard heater has an
incolloy sheath for best heat transfer and low fouling properties.
Low watt density immersion heaters at 12 kW are available options for these models,
depending upon the heating needs of the process. All models are built to provide full
heat as required by the process and determined by the controller, providing more
precise temperature control.
Solenoid Valves
Economical Series systems use rugged, industrial design solenoids with replaceable
coils and/or internal components. Depending on required cooling capacity, solenoid
valves are available in sizes ranging from
1 /
4
” to 3 /
4
”; 1 /
2
” x 9 /
16
” and 3 /
4
” x 3 /
4
” solenoid
valves are slow-closing.
Water Hammer Arrestor (Shock Stop)
Optional
Shock waves from fast-operating solenoid valves may damage some process systems.
For these applications, a welded metal bellows-type shock stop with a pre-charged and
sealed nitrogen blanket can be installed in the cooling piping.