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On/Off from the display: As long as the remote On/Off is connected, the chiller can be turned On and Off
from the display (either the remote display connected to the chiller or the webserver on a connected
computer).
In order to start/stop the chiller from the display, go to the On/Off screen (see point 4.2), and use the
Up/Down buttons to toggle between On and Off.
Setting the temperature: The required outlet temperature can be set between -10ºC (14ºF) and 35ºC
(95ºF) from the display (either the remote display connected to the chiller or the webserver on a connected
computer).
In order to set the temperature, go to the Setpoint screens (see point 4.2), press Enter to highlight the
current set value, use the Up/Down buttons to change the value and press Enter again to confirm the new
value.
Information screens loop: This is a series of information screens that can be accessed from the controller
display (see point 4.2). They contain information on the operation of the chiller. Use the Up/Down buttons to
navigate the different screens. Information on the pump pressure and water filter pressure drop can be found
within this loop, on the "Info – Plant" screens.
The last screens in this loop give access to change the language, the units of measure and the time and date
used by the controller.
Refrigerant compressor control and temperature stability: The chiller relies in its ability to adjust the
compressor speed to match the cooling capacity required by the application to maintain a high water outlet
temperature stability.
Please note that the compressor has a minimum speed ranging from 15% to 25% depending on the chiller
model and specific working conditions.
When the heat load from the application is lower than the minimum capacity of the compressor, the
compressor will stop automatically. The compressor restarts once the temperature increases enough, as long
as a minimum compressor Off time has elapsed.
In this kind of situation the outlet temperature stability can be worse than +/- 0.5 K.
4.4 PREHEATING FUNCTION
The chiller controller integrates an automated preheating system that can turn on the water pump when the
temperature in the water circuit drops below a specified setpoint. The heat introduced by the pump operation
maintains the water in the tank and also in the rest of the circuit at the preset temperature. This system will
operate as long as the general switch is turned On by turning the water pump On and Off when necessary.
By default this system is disabled, as it has a factory setting of -15ºC (5ºF).
Setting the preheating temperature: The required preheating temperature can be set between -15ºC (5ºF)
and 35ºC (95ºF) from the display (either the remote display connected to the chiller or the webserver on a
connected computer).
In order to set the temperature, go to the Setpoint screens (see point 4.2), press Down to access the
Preheating set screen, press Enter to highlight the current set value, use the Up/Down buttons to change the
value and press Enter again to confirm the new value.
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