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Over-Temperature Protection
6XXX Chillers — The OTP for 6XXX model Chillers is fixed at a cutout temperature of 60°C. The OTP will auto-
reset once the fluid temperature drops below the cutout temperature.
5XXX Chillers — The OTP for 5XXX model Chillers with the heater option is adjustable and disconnects power to
the heater at a factory-set temperature of 95°C. The OTP is reset by pressing the red button located on the rear
panel of the Chiller. If required, the cutout temperature may be adjusted using the OTP cutout temperature
adjustment screw located to the left of the red reset button. To change the OTP cutout temperature, rotate the
adjustment screw clockwise until it stops, bring the fluid temperature to the desired cutout temperature, and then
rotate the adjustment screw counterclockwise until the OTP opens. 95°C is the maximum cutout temperature.
OTP Adjustment Screw and Reset — 5XXX Chillers only
IMPORTANT: The range of the OTP cutout on 5XXX model Chillers is approximately 60° to 110°C. However,
the OTP cutout should never be set above the factory-set temperature of 95°C.
OTP Cutout
Adjustment Screw
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