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PAGE 6
2472 DI HEATER OPERATION / MAINTENANCE MANUAL
!
CAUTION:
Do not change OTC temperature settings. These units
are factory set and sealed at 105°C (221
F). Any change to the
setpoint of these over temperature controller devices may damage
the heater modules and will void the system warranty.
2.3.b Low Pressure Switch Interlock
The pressure switch will disengage power when heater module pressure
drops below 22-25 psig. DI water pressure is required for efficient heat
transfer. Operating the heater at lower pressure can damage heater
elements. The system will require pressing HEATER ON to restart (see
Section 8, Troubleshooting).
2.3.c Liquid Level Sensor Interlock
The Liquid Level Sensor will disengage power to the system if the heater
modules are not full of water and prevents them from running dry. The
system will require pressing HEATER ON to restart (see Section 8,
Troubleshooting). If sensor calibration is required, follow directions in
Section 7.4.
2.3.d Panel Interlock Switches
(is this section ok?)
The “Positive-Break” panel interlock switches will disengage power to the
system when the control panel on the system is opened (see Figure 2-1:
Panel Interlock Locations). Replacing panels and pressing HEATER ON
will be required to restart heater.
Figure 2-1: Panel Interlock Locations
Troubleshooting
