Applied Thermal Control Ltd
39 Hayhill Industrial Estate
Barrow-upon-Soar, Loughborough
LE12 8LD, United Kingdom
+44 (0) 1530 839 998
[email protected]
[email protected]
Operating Manual; Controller Operation
Annex E-6
DOCUMENT DETAILS
Date 28/AUG/2020
Author(s) AMI, MJH
Page 1 / 2
Revision 1
Z31-GS CONTROLLER & VARIABLE RESISTOR
Controller Z31GS is used as a temperature display and low temperature cutout device. It is used in conjunction with
compressor RA282, whose controller PCB accepts a resistor value to control the RPM of the compressor. ATC fit
a variable resistor and a fixed value resistor in series with one another to ensure the correct behavior.
This type of control prevents the compressor running when cooling demand is low and allows the user to
set the duty they wish the unit to perform when load is high.
In contrast, previous products (ATC KTR-series) would have the compressor run continuously onto a low
temperature limiting mechanical valve. Without load, the unit would run at its coldest until load returned, where it
ran at nominal capacity. If load was lower than nominal capacity, the unit would pull down to the low temperature
valve setting.
SETTING MINIMUM TEMPERATURE & CALIBRATION VALUE ON Z31-GS
Navigation
Upon
first powering on, the chiller will arrive at this display after a loading
sequence is complete. Process cooling will start automatically on the fridge
and water circuit.
1. The display will show the current water temperature leaving the chiller but
will take some time to stabilize if the unit has been switched off for some
time.
2. The up and down buttons are used for increasing or decreasing the low
temperature cutoff and for programming the controller.
3. The
‘P’ button is used for in conjunction with the arrow buttons to change
the low temperature cutoff (single press) or for entering the settings menu
(5s hold).
4. The
‘U’ button is used for returning to normal mode when in programming
mode.
Changing low temperature cutoff
1. From the main display press the
‘P’ button and release it immediately this
will show
‘SP’ on the display and alternate between this and the set low
temperature cutoff.
2. Use the up and down arrows to change the desired temperature cutoff.
3. Once you are happy do not press any buttons and the display will return
to normal operation.
Entering the programming menu
1. From the main display press and hold the
‘P’ button for 5 seconds.
2. Use the up and down arrows to scroll through the menu of editable
parameters.
3. Holding the
‘U’ button for 5 seconds will exit and return to the main
display
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Annex E-6 200826 Z31GS Controller & Variable Resistor
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