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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Fixed High Limit
Operation
The limit switch is factory preset to 210ºF (99ºC)
Shuts off pump when DHW temperature exceeds high
limit setting. The pump will not restart until the
temperature drops to the high limit setting minus the
temperature differential, and the manual reset switch
is reset.
Manual reset
Press the red reset button on the front of the case
to make sure that the controller is not locked out on
safety. When checking out the system, adjust the
control point low enough so the temperature of the
controlled DHW reaches the high limit setting, the
system pump off and the Vitotrans controller locks out.
When the temperature of the DHW drops to the high
limit setting minus the differential, push the manual
reset button and the system should be operative again.
Reset the control to the proper high limit setting.
Service
1. Locate the fixed high limit connection in the junction box.
2. Check the installation and check the voltage at each
terminal.
3. In the case of no voltage, replace the fixed high limit.
