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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
SEtH
U039-U042
Key:
PwrReq
: Output power
rUSr
: Water input temperature
SEtC
: Cooling setpoint
U039-U042
: Differential
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 differential
° 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 flashing. 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 affected).
The reset for some alarms is configurable via a parameter. Configurable alarms are:
— High pressure switch
— Low pressure switch
— Anti-freeze alarm
