Application manual
KNX room temperature controller EK-EQ2-TP
Release 3.00 - Updating: 27/06/2017
Application Manual
© SBS S.p.A. - All rights reserved
Page 55
Object name
Conditions
Dim.
Flags
DPT
Comm.
Obj.
No.
Auxiliary cooling disable
Auxiliary cooling =
enabled,
Disabled from bus =
yes
1 Bit
C-W---
[1.003] enable
70
Anticondensation alarm
At least one
anticondensation
protection enabled
1 Bit
CR-T--
[1.005] alarm
92
About the 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 anti-condensation protection can be realized:
by installing in the room an anticondensation sensor; when this detects condensation, it closes the
hydraulic circuit of the room. This is a protection of the
passive type
, i.e. a reaction occurs when the
formation of condensation has already started;
by calculating the dew-point temperature and comparing it with the conveying fluid temperature. If
the comparison indicates that critical conditions for the formation of condensation are approaching,
the hydraulic circuit is closed and / or the temperature of the conveying fluid is modified. This is a
protection of the
active type
, i.e. the action is intended to prevent the formation of condensation.
Nr.
Type
Denominazione
Description
1a
Passive
Anticondensation protection
with sensor (connected to a
physical input of the device)
Hardware protection that closes the cooling circuit of the room or zone when
condensation is detected by a sensor connected to an input of the room
temperature controller (configured as digital). To this purpose the
communication object 164: Auxiliary cooling output command [DPT 1.001
switch] is used.
1b
Passive
Anticondensation protection
with sensor (via bus)
As 1a, but the room temperature controller receives the information of
condensation via bus from another KNX device through the communication
object 146: Anticondensation (from bus) [DPT 1.001 switch].
2a
Active
Anticondensation protection
with comparison between
T
flow
(project value, set as
parameter in ETS) and
T
dewpoint
(calculated by the
room temperature controller)
Software protection that closes the cooling circuit of the room or zone when the
flow temperature defined in the project of the cooling system (set in the
corresponding parameter of ETS) is lower than the dew-point temperature
calculated by the room temperature controller with the temperature and relative
humidity values of the air mass in the room. o this purpose the communication
object 164: Auxiliary cooling output command [DPT 1.001 switch] is used.
2b
Active
Anticondensation protection
with comparison between
T
flow
(value measured and
sent on the bus) and T
dewpoint
(calculated by the room
temperature controller)
Software protection that closes the cooling circuit (measured) and received via
bus from another KNX device is lower than the dew-point temperature
calculated by the room temperature controller with the temperature and relative
humidity values of the air mass in the room. The communication objects 142 in
input: TFlow temperature (from bus) [DPT 9.001 temperature °C] and 164:
Auxiliary cooling output command [DPT 1.001 switch] are used.