Hi-T2
Centralised controller
31
Instead, when
Ambient temperature
<
Dew Point + Dew temp. margin :
•
The fan coils for dehumidification turn on.
•
The chillers start working with the set-point for the fan coils.
The permanence remains in this status until the temperature returns to:
Ambient
temperature ≥ Dew point + Dew temp. 1°C.
Even in the case where the above condition is verified, it remains in the dehumidification status for at least the time set by report
service parameter
Par43:
"Min. time in dehumidification"
, in order to avoid annoying oscillations.
If the above condition is not met after a maximum time given by the keyboard service parameter
Par44:
"Max Dehumidification
time"
, the machine comes out from dehumidification. To avoid returning immediately, in this case it requires remaining a minimum
in adjustment on the radiant panels, still given by
Par43:
"Max. time in dehumidification".
Figure 33: Dew point - Humidistat
4.10
CLIMATIC COMPENSATION
It is possible to compensate the regulation set-points according to outdoor temperature, in a different way between heating and
cooling modes, first and second set-point.
If you need to enable this function from Hi-T2 control panel, please be sure that, the dynamic setpoint parameter “
b08”
is disabled
(=0) on the chillers (System’s main page ->
Configuration
->
Service (maintenance) menu
->
Parameters
->
Chiller
->
Chiller’s name
->
b08).
The parameters to be set from Hi-T2 control panel can be reached from the configuration page -> service (maintenance) menu ->
Parameters -> Keyboard:
Number
Parameter name
Description
Range
11/65
Set Text comp CHIL Cool
Setpoint of external temp. for climatic compensation of the chiller in cooling 0 : 50°C
12/65
Set Text comp CHIL Heat Setpoint of external temp. For climatic compensation of the chiller in heating -20 : 35°C
13/65
m1 comp Text CHIL
Angular coefficient of the chiller compensation line (cooling)
-10 : 10
14/65
m2 comp Text CHIL
Angular coefficient of the chiller compensation line (cooling)
-10 : 10
15/65
m3 comp Text CHIL
Angular coefficient of the chiller compensation line (heating)
-10 : 10
16/65
m4 comp Text CHIL
Angular coefficient of the chiller compensation line (heating)
-10 : 10
17/65
Set Text comp FC Cool
External temp. Setpoint for the climatic compensation of the zone in cooling 0 : 50°C
18/65
Set Text comp FC Heat
External temp. Setpoint for the climatic compensation of the zone in heating -20 : 35°C
19/65
m5 comp Text CHIL
Angular coefficient of the of the compensation line of the zones (cooling)
-10 : 10
20/65
m6 comp Text CHIL
Angular coefficient of the of the compensation line of the zones (heating)
-10 : 10
21/65
Set2 Text comp CHIL Cool
External temp. Setpoint for the climatic compensation of the second
setpoint of the chiller in cooling mode
0 : 50°C
22/65
Set2 Text comp CHIL Heat
External temp. Setpoint for the climatic compensation of the second
setpoint of the chiller in heating mode
-20 : 35°C
23/65
Second m1 comp Text CHIL Angular coffecient of the compensation line of the seconde setpoint of the
chiller (cooling)
-10 : 10
24/65
Second m2 comp Text CHIL Angular coffecient of the compensation line of the seconde setpoint of the
chiller (cooling)
-10 : 10
25/65
Second m3 comp Text CHIL Angular coffecient of the compensation line of the seconde setpoint of the
chiller (heating)
-10 : 10
26/65
Second m4 comp Text CHIL Angular coffecient of the compensation line of the seconde setpoint of the
chiller (heating)
-10 : 10
% Output
Time of relay activation respecting tAr
Dew
point
Dew point +
odr
Tint (°C/°F)
odr
