Sterlco Micro Series Water Temperature Control Unit - Manual (Page 25)

MICRO Series Water Temperature Control Units Page 25
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.
Pressure Switch
A pressure switch built into each unit keeps the system from starting until the
water supply is turned On and subjected to the minimum water supply pressure.
This feature protects the pump seal and the heater from damage through
attempted operation without water. The pressure switch is set at approximately
16 psig (110.32 kPa/1.10 bars) for 250°F (121ºC) units prior to leaving the
factory.