Unical TOUCH SCREEN N, User'S And Installer'S Manual

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Touch Screen
32
Given the environmental temperature and the humidity, the Touch Screen remote control calculates the dew point.
In operation of the plant in summer mode, with the double set-point function active on chillers and thermoregulation normally
made with the radiant panels (second set of work), it activates a control to keep the dew point of at least a quantity defined by the
keyboard maintainer parameter
Par42/65:
"Dew-point temp. margin " °C below the ambient temperature detected by the control
itself.
Instead, when ambient temperature < Dew Point + Margin temp. Point :
•
The fan coils for dehumidification turn on.
• The chiller 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 status of dehumidification for at least the time set by
maintainer parameter Par43/65: "Min. staying time in dehumidification " , in order to avoid annoying oscillations.
If the above condition is not satisfied after a maximum time given by the maintainer parameter
Par44/65
: " Max Dehumidification
time ", the machine comes out from dehumidification. To avoid returning immediately, in this case it requires a minimum staying in
adjustment to the radiant panels, still given by Par43/65: "Max. staying time in dehumidification".
4.11
CLIMATIC COMPENSATION
It is possible to compensate the set-point according to outdoor temperature, in a different way between heating and cooling modes,
first and second set-point.
In such a case be sure that the b08 parameter (System main page -> Configuration -> Service menu -> Parameters -> Chiller -> Chiller
name -> b08: Enab. dynamic set point) is disabled (=0) on the chiller.
Setpoint
T ext
Set
Set Text
Offset
Offset
m2
m1
Setpoint
T ext
Set
Set Text
Offset
Offset
m2
m1
Figure 34. Climatic compensation.
• Set = T water, T water ECO o T
2
water, T
2
water ECO, settable from the page: ” Set-point setup ” -> “Chiller”.
• Offset = offset settable from the page: ” Set-point setup ” -> “Chiller” (the variable “ Offset ” appears only if the “m”
coefficients have been configured ).
• Set Text , m1 , m2 = parameters which can be set from: “ Configuration” -> “ Service menu ” -> “ Parameters ” -> “ Keyboard ”
(see paragraph Touch Screen control panel configuration parameters).
To exclude the climatic compensation from the user, you have to set to zero all the offsets in the menu ” Set-point setup ” -> “Chiller”.
To exclude the climatic compensation from the service, you have to set to zero the “ m ” coefficients in the service menu, keyboard
parameters.
The outdoor temperature is detected by a dedicated sensor already wired to the heat pump.