AEC Econo-Cool Chillers - Manual (Page 31)

Page 30 AEC Water Temperature Control Units
Cooling
The controller automatically regulates cooling by opening and closing the solenoid
valve. The unit cools by removing the required amount of warm water from the system.
This process permits an equal amount of cool plant water to enter the system well ahead
of the pump, allowing it to blend with the system water. The water supply temperature
governs the minimum operating temperature of the unit.
Note: The plant water supply temperature governs the minimum operating temperature
of the unit.
Electricals
The pump motor and the immersion heater operate on three-phase 50/60 cycle nominal
voltages with the control circuit operating at 115V single phase. The control circuit
voltage is provided by a single phase machine tool transformer with a grounded
secondary.
The 115V control circuit and controller outputs are fuse protected. The pump motor is
controlled by a full voltage magnetic non-reversing motor starter, with fused branch
circuit overcurrent and thermal overload protection.
Automatic Vent
This feature automatically triggers the purging of air from the system before you start
the unit. The vent actuates the solenoid valve, and forces trapped air and water out
through the drain, properly filling and priming the unit prior to startup. Complete
venting is necessary to prevent damage to the pump and heater.
The vent process is controlled through a timer. If you have a large process, you may
need to complete the venting process by pressing the
VENT button on the front-
mounted switch panel.