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3.5
Controller maintenance
The controller requires to maintain the installed battery. Every two years it’s required to replace the battery. Battery mode l
is: BR2032 and it is produced by many different vendors.
To replace the battery remove the plastic cover of the controller display using a screw driver as shown in the following
pictures:
Be careful to avoid damages to the plastic cover. The new battery shall be placed in the proper battery holder which is
highlighted in the picture, respecting the polarities indicated into the holder itself.
3.6
Optional Remote User Interface
As an option an external Remote HMI can be connected on the UC. The Remote HMI offers the same features as the
inbuilt display plus the alarm indication done with a light emitting diode located below the bell button.
The Remote can be ordered with the unit and shipped loose as a field installed option. It can also be ordered any time after
chiller shipment and mounted and wired on the job as explained on the following page. The remote panel is powered from
the unit and no additional power supply is required.
All viewing and setpoint adjustments available on the unit controller are available on the remote panel. Navigation is
identical to the unit controller as described in this manual.
The initial screen when the remote is turned on shows the units connected to it. Highlight the desired unit and press the
wheel to access it. The remote will automatically show the units attached to it, no initial entry is required.
The Remote HMI can be extended up to 700m using the process bus connection available on the UC. With a daisy -chain
connection as below, a single HMI can be connected to up to 8 units. Refer to the specific HMI manual fo r details.
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