Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 10)

10
Instruction manual Laing Electric heater circulator unit
www.lainginc.com
The integrated microprocessor control in the housing on top of the Electric
heater circulator unit performs a variety of control functions for a large number
of applications.
The heating elements are noiselessly switched by electronic relays.
Schematics of the integrated control
The block diagram shows the control in schematic presentation
B Temperature sensor for feed temperature
C Temperature sensor for the safety temperature limiter
D Temperature sensor for the semiconductor relays
G Pump operation control logic
IS Input for external control and remote control
MP Microprocessor
O Control for the semiconductor relays
P Potentiometer for constant temperature setting
PI Pump performance control
Q Safety temperature limiter
RA Analog inputs for temperature sensors and temperature pre-selection
T Potentiometer for safety temperature setting
TI Safety temperature limiter control logic
W Heating elements
X Semiconductor relays
Y Jumper settings for operation mode
Temperature sensor B monitors the temperature of the feed line water and
PI G IS W
TI
Y MP X Q
O
RA
B C D P TS