Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
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3
USING THE CONTROLLER
The control system consists of a unit controller (UC) equipped with a set of extension modules that implement
additional features. All boards communicate via an internal peripheral bus with the UC. The Microtech III
continuously manages the information received from the various pressure and temperature probes installed
on the compressors and communicated to the unit .The UC incorporates a program that controls the unit.
The standard HMI consists of an inbuilt display (A) with 3 buttons (B) and a push’n’roll control (C).
The keypad/display (A) consists of a 5-line by 22 character display. The function of the three buttons (B) is
described below:
Alarm status (from any page it links with the page with alarm list, alarm log and alarm snapshot if available)
Back to Main Page
Back to the previous level (it can be the Main Page)
The push’n’roll command (C) is used to scroll between the different menu pages, settings and data available
on the HMI for the active password level. Rotating the wheel allows to navigate between lines on a screen
(page) and to increase and decrease changeable values when editing. Pushing the wheel acts as an Enter
Button and will jump from a link to the next set of parameters.
3.1 General Recommendation
Before switching on the unit read the following recommendations:
When all the operations and all the settings have been carried out, close all the switchbox panels
The switchbox panels can only be opened by trained personnel
When the UC requires to be accessed frequently the installation of a remote interface is strongly
recommended
Evaporator, compressors and related inverters are protected from freezing by electrical heaters. These
heaters are supplied through unit main supply and temperature controlled by thermostat or by the unit
controller. Also the LCD display of the unit controller may be damaged by extremely low temperatures.
For this reason, it is strongly recommended to never power off the unit during winter, especially in cold
climates.
3.2 Navigating
When power is applied to the control circuit, the controller screen will be active and display the Home screen,
which can also be accessed by pressing the Menu Button. The navigating wheel is the only navigating device
necessary, although the MENU, ALARM, and BACK buttons can provide shortcuts as explained previously.
An example of the HMI screens is shown in the following picture.
M a i n
M e n u
1 / 11
E n t e r
P a s s w o r d
U n i t
S t a t u s =
O f f :
U n i t
S W
A c t i v e
S e t p t =
7 . 0 ° C
A bell ringing in the top right corner will indicate an active alarm.
If the bell doesn’t move it means that the
alarm has been acknowledged but not cleared because the alarm condition hasn’t been removed. A LED will
also indicate where the alarm is located between the unit or circuits.
A
B C
UC
A