Hi-T2
Centralised controller
29
3.
enter “
Clock
”;
4.
set date and time using the arrows (the values to adjust will be red-coloured);
5.
when all values are set, press the icon with the tick to confirm.
Figure 32. "Clock" page.
4.8
DIAGNOSTIC ERRORS
4.8.1
ACTIVE ALARMS
You can view the current alarms of the connected units. To do this, from the home page, press the danger triangle icon, if present;
from here you can access the list of all active alarms in the system.
Also, when a unit is displayed (i.e. Chiller page, see Paragraph 3.4.1), by pressing the triangle that appears on the machine, you go to
a menu where you can see the 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. The alarm history stores up to 100 alarms; once this limit is exceeded, it automatically deletes the older alarms.
To go to the alarm history: from the system main page, go into "
Configuration
" -> "
Service menu
" -> "
Alarm log
".
Having the service 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 33/65: Enable user alarm log = 1.
4.9
DOUBLE SET-POINT 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 units for dehumidification.
The purpose of the application is to prevent the formation of condensation on the floor in any condition, and in any case to ensure
thermo hygrometric well-being.
The double set-point is activated from service parameter (from System main page ->
Configuration
->
Service menu
->
Parameters
->
Chiller
->
Chiller name
->
H129: Enable second setpoint ≥ 2
, ref. the control manuals of the chiller unit for allowable values). It is also
required to set a digital output for controlling the three-way valve used to divert the flow of water between the floor and fan coils.
The humidistat function is instead carried out directly by the Hi-T2 remote control panel, by means of its integrated probes 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 that can be set with double set-point function enabled are:
Setpoint
Setpoint at Hi-T2
Setpoint onboard control panel
First setpoint (°C)
T water
Coo/Hea
First setpoint eco (°C)
T Water ECO
Second setpoint (°C)
T2 water
Co2/He2
Second setpoint eco (°C)
T2 water ECO
Table 4. Set point settings with double set point enabled.
To manage the setpoint:
•
from the Hi-
T2 controller →
“Set-point setup”
menu ->
“Chiller”
->
”Summer”
or
“Winter”
(see Paragraph 4.6.3).
•
from the on-
board control panel → SET button.
The second setpoint is higher than the first set point in summer and lower in winter:
•
in summer: T
2
≥ T
•
in winter: T
2
≤ T
