Carbolite Gero 3508 Installation, Operation And Maintenance Instructions page 37

6.0 Operation
Where appropriate the power limit parameter OP.Hi is accessible to the operator, but it
should not generally be altered.
See section 11.0 for details of the power limit settings. DO NOT adjust the power to a
level higher than the design level states; this may cause a fuse to blow and could
damage the heating elements.
The power limit may be set to a lower limit if the product is to be used at a low
temperature only: this may give better control stability. It may be set to zero to permit
demonstration of the controls without the heating elements taking power; to resume
heating reset it to its standard value.
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