Service Manual

GENERAL INFORMATION
Optional Controls (continued)
Electrical Door lock-
An electrical door lock is offered in order to secure the access to the water heater control cabinet. This device will lock
the control cabinet door when the 120VAC control circuit voltage is applied to it.
Note: Once the door is opened, the water heater can be re-energized, if necessary, for service diagnosis.
Alarm Horn-
The Alarm Horn is an option specified when the installation desires an audible signal to immediately sound an alert
when the water heater operation is interrupted for certain faults. Referring to the control circuit wiring diagram, the alarm
will activate when any one of the following events occur:
The Hi-Limit control has been tripped
The High Water Pressure Control senses excessive pressure
The Low Water Pressure Control senses insufficient pressure
The Low Water Level Control senses an insufficient quantity of water
The alarm will sound only for the options specified (i.e. if a low water level control is not specified then the alarm will not
recognize a low water level condition).
Horn Relay
Horn Relay
Internal Wiring
Page 8
Combination Temperature and Pressure Gage-
A non-electrical device to visually reference water temperature and internal tank pressure.
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