Applicatio Manual
Universal Interface 4 DIN/NTC EK- CG2-TP
Revisione 1.0.0 - Aggiornato: 04/09/2017
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MAEKCG2TP_EN
Pag. 61
Cooling out command
Control type = 2
point hysteresis or
PWM
1 Bit
CR-T--
[1.001] switch
39
Object name
Conditions
Dim.
Flags
DPT
Comm.
Obj.
No.
Cooling out command
Control type =
continuous
1 Byte
CR-T--
[5.001] percentage (0..100%)
39
Auxiliary cooling output
command
Auxiliary cooling =
enabled
1 Bit
CR-T--
[1.001] switch
41
Auxiliary cooling enable
Auxiliary cooling =
enabled,
Disabled from bus =
yes
1 Bit
C-W---
[1.003] enable
43
Anticondensation alarm
At least one
anticondensation
protection enabled
1 Bit
CR-T--
[1.005] alarm
66
About anticondensation protection function
The objective of this function is to prevent the condensation on the thermal exchange surfaces of the installation or
building when cooling is working. This function is mainly used in systems with thermal exchange consisting in surface
terminals such as for the floor and ceiling cooling radiant systems. In this case the hydraulic circuits contain refrigerated
water; usually the latent loads (due to the increase of air humidity in the room) are handled by air-conditioning units and
the temperature and humidity conditions are far from those that could cause condensation. If this is not done in a
satisfactory manner, or in case of stop of the air-conditioning units, it is necessary to provide additional safety measures
to prevent or restrict the accidental formation of condensation on cold surfaces.
From a general point of view, the anticondensation protection function can be realized:
•
by installing a proper room anticondensation probe; when this is active, the hydraulic circuit closes down. It is a
passive protection, because the intervention takes place when condensation has already started;
•
by calculating the dew-point temperature and confronting it with the conveying fluid flow temperature. If the
critical condition for condensation is approaching, you can intervene by closing down the hydraulic circuit or
adjusting the mixing conditions of the conveying fluid. This is an active protection because the goal is to prevent
the condensation.
Nr.
Type
Denomination
Description
1a
Passive
Anticondensation protection
by probe (via bus)
The thermostat receives the information about condensation via bus from a
different KNX device through communication object 27: Anticondensation (from
bus) [DPT 1.001 switch].
2a
Active
Anticondensation protection
with comparison between
flow temperature (constant
projected value, set as
parameter on ETS and
dewpoint temperature
(calculated by the thermostat)
Software protection that intervenes by closing down the room cooling circuit
when the flow temperature defined in the hydronic project (as set in the
corresponding ETS parameter) is lower than dew-point temperature calculated
by the room thermostat using temperature and relative humidity values. The
communication object involved is 45: Cooling out command [DPT 1.001 switch].
