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4.8 FAULT DIAGNOSTIC
4.8.1 ACTIVE ALARMS
You can view the current alarms of the connected units. To do this, from the home page, press the triangle icon of danger, if
present; from here you can access to the list of all active alarms in the system.
Also, when you are in an unit page (i.e. Chiller page, see Paragraph 3.4.1, and fan coil page, see Paragraph 3.4.2), by pressing the
triangle that appears on the machine, you go to a menu where you can see current alarms of the selected machine.
4.8.2 ALARM HISTORY
The keyboard manages a detected alarms list for all the plant that shows the date and time of the alarm, the affected machine and
alarm type. In the historic are stored up to 100 alarms, once exceeded the limit, it automatically deletes the older alarms.
To go to the alarm history: from the system main page, go into "Configuration" ‐> "Service menu" ‐> "Alarm list".
Having maintainer password, you can set that the alarm history is also accessible from the user menu; to do this go into
"Configuration" ‐> "Service menu" ‐> "Parameters" ‐> "Keyboard" ‐> Par 33/44: Enable user alarm log = 1.
4.9 DOUBLE SET‐POINT AND DEHUMIDIFICATION FUNCTIONS
The double set‐point function introduces a second plant side set‐point (both in cooling mode and in heating mode).
The application field is primarily that of the floor cooling assisted by fan coil for dehumidification.
The purpose of the application is to prevent in any condition the formation of condensation on the floor, and in any case to ensure
the welfare thermo hygrometric.
The activation of the double set‐point is by means of maintainer parameters (from System main page ‐> Configuration ‐> Service
menu ‐> Parameters ‐> Chiller ‐> Chiller name ‐> H82: Enable second setpoint ≥ 2, ref. chiller manual for allowable values). Must also
be set a digital output for controlling the three‐way valve used to divert the flow of water between the floor and fan coils. The
function of humidistat is instead carried out directly by the remote control Hi‐T, by means of its integrated sensors and the logic
internally implemented related to the control of dew point and dehumidification.
Please refer to the manual of the chiller for the correct setting of parameters related to the double set‐point, as well as for the
electrical connections to be done in the terminal board of the chiller.
The set‐points can be set with double set‐point function enabled are:
Setpoint
First setpoint (°C)
First setpoint eco (°C)
Second setpoint (°C)
Second setpoint eco (°C)
To manage the setpoint:
•
from Hi‐T →"Set‐point setup" menu ‐> "Chiller" ‐>"Summer" o "Winter" (see Paragraph 0).
•
from on‐bard control panel → SET button.
The second setpoint is greater than the first set point in summer and lower in winter:
•
in summer: T
≥ T
2
•
in winter: T
≤ T
2
The parameters to be set for the management of dehumidification are accessible from the maintenance menu (Configuration ‐>
Service menu ‐> Parameters ‐> Keyboard):
Parameter Name
Par 42/44
Par 43/44
Par 44/44
33
Setpoint on Hi‐T
T water
T eater ECO
T2 water
T2 water ECO
Table 6. Set point settings with enable double set point.
Dew‐point temp. margin
Min. staying time in dehumidification Seconds
Max. staying time in dehumidification Seconds
Table 7. Service keyboard parameters for dehumidification.
Setpoint onboard
control panel
Coo/Hea
Co2/He2
Unit
Default Min. Max.
°C
Hi‐T
Centralized controller
Summer
Winter
7 (5÷18)
45 (35÷55)
12 (5÷18)
40 (35÷55)
18 (7÷23)
35 (25÷45)
23 (7÷23)
30 (25÷45)
5.0
0.0
50.0
300
0
600
600
0
1200
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