Sterlco Royal Series Compact Temperature Control Unit - Manual (Page 30)

Page 30 Royal Series Water Temperature Control Units
Cooling
The controller automatically regulates cooling by opening and
closing the solenoid valve or modulating valve. For direct
injection, 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.
For closed circuit operation, the unit cools by automatically
releasing cooling water through the tubes of the specially designed
tube bundle heat exchanger in each zone. The process fluid, such
as water, glycol, or other similar fluid, is circulated through the
shell of the heat exchanger.
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.