Trebor Quantum Series Di Water Heater - Manual (Page 9)

QUANTUM DI HEATER OPERATION / MAINTENANCE MANUAL PAGE 9
2.4.b Liquid Level Sensor Interlock
The Liquid Level Sensors will disengage power to the system if the
heater modules are not full of water or if boiling in the heating module
occurs. The heater will reengage if fluid is present within a 30 second
time period. This prevents nuisance trips due to transient conditions in
the DI water supply while still protecting the heater during startup. It is
critical that these sensors operate properly. Do not tamper with the
sensors. Damage to the system can result if the sensors are altered or
overridden.
NOTE: On the dual output option, this interlock will protect the heaters it
monitors (i.e. sensor 1 will protect the modules supplying output 1).
2.4.c Element Ove r Temperature Protection
The temperature limit controller monitors a thermocouple attached to the
heater element. In the event that the element temperature exceeds the
normal operating temperature, the system will immediately disengage
power and alarm. If this occurs, check element continuity before
continuing normal operation. See Section 7.1.a.
2.4.d Leak Sensor
The Leak Sensor will disable heater power immediately when water is
detected in the leak tray. Fix any leaks and dry the leak sensor and leak
tray prior to turning power on to the system.
2.4.e Overpressure Burst Fitting
The overpressure burst fitting (“Relief Drain”) is connected in-line with the
cold DI inlet port to provide a mechanical safeguard against possible
overpressure damage. Do not operate the heater above 414 kPa (60
psig).
If the overpressure relief device opens, the low-pressure sensor will
alarm. A periodic visual inspection of the fitting is recommended. Refer
to Section 7.1.g on replacing burst fitting.
2.5 LOCKOUT / TAGOUT
2.5.a Preliminary
Before installation or servicing the DI water heater, the facility’s power
source to the heater must be de-energized to prevent serious injury to
personnel and equipment. An authorized employee representing the
facility installing the DI water heater must follow approved company
guidelines and lockout or use suitable means to prevent re-energizing the
electrical system during installation or servicing.