2050 Operations Manual
Rev L 2/2/2018
Page 17 of 22
ALARM
Low Level Alarm
The circulator is equipped with an alarm system that alerts the operator of a low fluid
level condition. When more fluid is needed, an audible buzzer will sound and the red
low level light on the control panel will illuminate. While in alarm mode, the circulator
will not properly control fluid temperature. External circulation will continue.
Add fluid per instructions in INSTALLATION section. When the fluid returns to an
appropriate level, the alarm will turn off and control fluid temperature as set.
Temperature Tracking Alarms
Other than the low level alarm created by the float switch, the alarm system checks to
see if the current temperature is above or below the temperature tracking alarm levels
as configured in AL.L and AL.H. If an alarm conditions exists, the display cycles
between the current temperature and the alarm condition at 1 second intervals.
To avoid nuisance alarms on system power up or setpoint changes, the alarms are
disabled for two hours or until the actual temperature gets within the alarm high and
low levels.
Temperature Sensor Error
In the unlikely event that a faulty temperature sensor is detected, “SErr” will be
displayed. Both the heater and the refrigeration system will remain off in this condition.
High Temperature Safety
The high temperature safety shut-off switch is preset from the factory just above 90ºC.
In the unlikely situation that the fluid temperature would exceed the circulator rated
temperature of 90ºC; an independent temperature sensor will turn off the heater.
External circulation and cooling (if temperature setpoint is below 40ºC) will continue.
When the fluid temperature drops below 90ºC, the heater function is enabled.
Contact a service representative immediately to correct the problem. The circulator
should not be used until it is repaired.
