Bradford White MII Series Service Manual page 6

Surface Mounted Thermostats
Surface mounted thermostats are mounted into a bracket above each heating element. The bracket holds the
thermostat against the side of the tank responding to tank surface temperatures to sense a call for heat, set point
temperature and high limit (ECO) activation. As each element has a dedicated thermostat (for all models excluding
600V), it is possible to sequence the elements by varying the settings on the thermostats.
Immersion Style Thermostat Control for
Contactor Models
The thermostat will complete control circuit
voltage upon a call for heat. Likewise, the control
will interrupt control circuit voltage when the water
temperature is sufficient to satisfy the adjustable
temperature limit of control.
Immersion Style High Limit (ECO) Control for
Contactor Models
The high limit (ECO) control will interrupt control circuit voltage
causing the heater to shut down when the high temperature limit of
the control is reached (196°F±4°F). Once the cause for over
heated water has been determined, The control must be manually
reset to restore normal operation.
6
Manual
ECO (high limit)
Reset button
Temperature
control Dial
Immersion
Manual Reset
Buttons
Page 6
GENERAL INFORMATION
Surface Mount
Combination Thermostat/
ECO (high limit)
89T Series
Direct
bulb
Direct
Immersion
bulb