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WORK THERMOSTAT

Graphs below illustrate how the micro chiller controller calculates machine intervention step based on function set selected by user (please remember that change procedure

and list of parameters that can be changed can be found in the previous pages).

Cold one step Thermostat

SEtC U039-U042

Hot one step thermostat

SEtHU039-U042

Key:

PwrReq: Output power

rUSr: Water input temperature

SEtC: Cooling setpoint

U039-U042: Dierential

SEtH: Heating setpoint

STANDARD CALIBRATION AND CALIBRATION FIELD OF REGULATING DEVICES

Description U.M. Minimum Standard Maximum

Water temperature set to heating ° C 25 41 55

Work thermostat dierential ° C 0,3 2 19,9

Water temperature set to cooling ° C 7 11 25

5 ALARM

The alarms managed by the control are of 3 types according to the reset mode:

— A - automatic: the alarm resets and the device concerned restarts automatically when the alarm condition ceases to exist;

— R - semi-automatic: if the alarm condition occurs several times, the alarm becomes manually reset and an operator is required to restart the device.

— M - manual: operator intervention is required to restart the device.

Alarms requiring Service intervention indicate the request on the display by the key icon ashing. The lit key icon indicates that a device has reached the programmed thresh-

old of the number of functioning hours, and maintenance is required (the alarm code indicates which device is aected).

The reset for some alarms is congurable via a parameter. Congurable alarms are:

— High pressure switch

— Low pressure switch

— Anti-freeze alarm