Service Manual

GENERAL INFORMATION
Page 9
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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 High-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
Internal Wiring
Horn Relay
Combination Temperature and Pressure Gage
A non-electrical device to visually reference water temperature and internal tank pressure.
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