Duemmegi Domino DFRHT User manual

Domino
DFRHT
DFRHT: relative humidity, ambient
temperature and dew point combined
sensor
DFRHT module detects and transmits, over the Domino
bus, the relative humidity and the ambient temperature
measured by a special sensor inside the module itself.
In addition, DFRHT module calculates the dew point. The
dew point is the temperature at which, at constant pres-
sure, the humidity contained in the air begins to condense
into water. The dew point is always less than or e ual to
the temperature of the air.
DFRHT module also features 2 digital points that, when ac-
tivated, report the following conditions:
•the dew point is greater than or e ual to a configurable
first value (e.g. 14ºC); this is useful to activate the de-
humidifier
•the dew point is greater than or e ual to a configurable
second value (e.g. 18ºC, safety value); this is useful to
switch off the cooler
These two thresholds, as said, can be freely fixed and also
two separated configurable hysteresis are provided.
DFRHT module is thus particularly suitable for the manage-
ment of the dehumidification and cooling of rooms. DFRHT
module has been expressly developed for the wall mount-
ing.
The module features only one 2-way terminal block for the
connection to the Domino bus; no more connections are re-
uired: as for the majority of Domino modules, the power
supply re uired for the module operation is derived from
the bus itself. The housing is a plastic box and the protec-
tion degree is IP20.
A small pushbutton inside DFRHT module allows to assign
the desired address and a green LED report the operating
status; this green LED flashes every 2 seconds when the
module is properly connected and operating. A small 3-way
connector is also provided for the uick connection to
DFPRO tester/programmer.
Address programming
DFRHT module takes, inside the Domino bus, 4 consecut-
ive input addresses and, if enabled by the configuration
panel of BDTools or DCP Ide, 2 consecutive output ad-
dresses. However, a uni ue base address has to be as-
signed to the module to make it operating; assigning an ad-
dress n, it will take the input addresses from n to n+3 and
the output addresses from n to n+1 (if enabled). For the de-
tails about the address programming refer to the related
documentation.
Wiring diagram
The following schematic diagram shows the connection re-
uired between DFRHT and the Domino bus.
1
+BUS -BUS
+
BUS _
Installation hints
The correct positioning of the sensor plays a key role for
the correct measurement of humidity and temperature,
therefore it is recommended to strictly observe the following
principles of installation:
•do not install the module on a wall in contact with the
outside or in contact with an unheated room (e.g. gar-
age)
•do not install it on a hot wall (such as walls containing
heating pipes)
•do not place it near a heat source that could distort the
proper temperature reading
•avoid to place it near to household appliances that ra-
diate heat (microwave, refrigerators, televisions, etc..)
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. [phone] - Fax [phone] – www.duemmegi.it
Rel.: 1.0 October 2011 Page 1 of 5
HOME AND BUILDING AUTOMATION

Domino
DFRHT
•do not place it in dead corners, behind doors or where
the air cannot freely circulate, but also avoid places
subject to excessive air currents
•a possible opening for the cables on the back of
DFRHT module must be sealed to prevent air currents
affecting the measures
•do not install the module in a place where it can be
subjected to direct sunlight from the outside
•install it at about 140/150 cm. from the floor
To install DFRHT module follow the steps described below.
Opening the module
Find the two fissures where the small dull tooths of the rear
panel are housed (normally on the bottom side). Insert the
tip of a small screwdriver in one of these fissures so that
the rear panel releases towards the outside. Then insert
the screwdriver in the other fissure so to extract completely
the rear panel.
Address assignment
Insert the proper con-
nector of DFPRO pro-
grammer (or other sys-
tems suitable for the
address assignment,
see the related system
documentation) in the
3-way connector on
the rear side of the
electronic card; then
assign the base ad-
dress following the
normal procedure of
all Domino modules.
Connection
Open the hole on the rear panel helping yourself with a
small pincers or a pair of scissors. Insert the wires of the
bus in the hole of the rear panel;
fix the rear panel to the wall, pla-
cing attention to its orientation
(see the UP label on the rear
panel itself). Be sure that no
voltage is present on the wires.
Connect the wires to the terminal
blocks of the electronic card ac-
cording to schematic diagram.
Closing the module
Place the top side of the cover on the rear panel fixed to
the wall, so that the two tooths on the top side of the rear
panel itself fit in the related
fissures and, at the same
time, the connector of the
electronic card fits into the
terminal block. At this
point, delicately push the
bottom side of the cover
towards the rear panel, un-
til the two dull tooths on
the rear panel fit in the re-
lated fissures of the cover.
Information reported on the bus
Input section
As said above, DFRHT module takes, inside Domino bus, 4
input addresses and, if enabled, 2 output addresses. Said
n the assigned base address, the information mapped on
the input section are the following:
Point n n+1 n+ n+3
1
Value
of the
relative
humidity
(%)
Value
of the
ambient
temperature
in tenth of
°K (Kelvin
degrees
multiplied
by 10)
Value
of the
dew point
in tenth of
°K (Kelvin
degrees
multiplied
by 10)
DP ≥ thresh.1
DP ≥ thresh.2
3-
4-
5-
6-
7-
8-
9-
10 -
11 -
1 -
13 -
14 -
15 -
16 -
In details, the input addresses n, n+1 and n+2 respectively
report:
•measurement of the relative humidity in %; value in the
range 0 to 100%
•measurement of the ambient temperature in °K multi-
plied by 10; called X the value reported by the address
n+1, to convert it to °C use the formula (X–2730)/10.
The temperature in BDTools or DCP Visio will be in-
stead directly displayed in °C
•calculated value for the dew point in °K multiplied by
10; called Y the value reported by the address n+2, to
convert it to °C use the formula (Y–2730)/10. The tem-
perature in BDTools or DCP Visio will be instead dir-
ectly displayed in °C
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. [phone] - Fax [phone] – www.duemmegi.it
Rel.: 1.0 October 2011 Page 2 of 5
HOME AND BUILDING AUTOMATION

Domino
DFRHT
The address n+3 reports two digital points that, when activ-
ated, signals the presence of the following conditions:
•DP ≥ thresh.1: the dew point is greater than or e ual to
a first threshold value specified by the content of the
output section of the module itself at address n, or by a
value in the memory of the module (see in the follow-
ing of this manual)
•DP ≥ thresh.2: the dew point is greater than or e ual to
a second threshold value specified by the content of
the output section of the module itself at address n+1,
or by a value in the memory of the module (see in the
following of this manual)
Output section
The module can feature, as said above, 2 output addresses
for setting the two dew point thresholds via bus; these ad-
dresses have to be enabled, if re uired, by the DFRHT
configuration panel provided by BDTools or DCP Ide, as
described in the following.
Said n the assigned base address, the information mapped
on the output section are the following:
Point n n+1
1
Value of
threshold 1
for dew point,
in tenth of °K
(Kelvin de-
grees multi-
plied by 10)
Value of
threshold 2
for dew point,
in tenth of °K
(Kelvin de-
grees multi-
plied by 10)
3
4
5
6
7
8
9
10
11
1
13
14
15
16
In details, the output addresses n and n+1 respectively re-
port:
•Threshold 1 to be compared to the the current dew
point value, in °K multiplied by 10; called X the desired
value in °C, to convert it to °K multiplied by 10 use the
formula (X+273)x10. The threshold in BDTools and
DCP Visio will be instead directly set in °C.
•Threshold 2 to be compared to the the current dew
point value, in °K multiplied by 10; called Y the desired
value in °C, to convert it to °K multiplied by 10 use the
formula (Y+273)x10. The threshold in BDTools and
DCP Visio will be instead directly set in °C.
If the output address has been enabled, the module will ex-
ecute the comparison between the current dew point and
the two just described values; in this way, a supervisor,
touch screen terminal or other master device can easily set
the thresholds because it is enough to write the desired val-
ues to the output addresses.
If instead the two threshold are fixed and it is not to modify
them, it is possible to save the output addresses disabling
them by DFRHT configuration panel provided by BDTools
or DCP Ide; in this case, the comparison will be made with
the two values written in the non volatile memory of the
module. In this case too, the two values in the memory can
be changed by DFRHT configuration panel.
Anyway, the result of the comparison between the dew
point and the two thresholds will affect the point 1 and 2 of
the input section at address n+3.
Using the digital points of DFRHT
As said before, DFRHT module provides, at input address
n+3, two digital points that will be activated when the fol-
lowing conditions occur:
•the dew point is greater than or e ual to a first
configurable threshold value
•the dew point is greater than or e ual to a second
configurable threshold value
The first point is normally used to activate the dehumidifier
when the dew point exceeds a given value (e.g. 14ºC)
The point 2 can be instead used to switch off the cooling
unit when the dew point exceeds another given value (e.g.
18ºC, also said safety value).
The availability of these digital points allows to implement
the dehumidifier management without using the DFCP con-
troller, or anyway this allows to simplify the programming of
the controller itself.
DFRHT configuration panel
The configuration panel, available in BDTools and DCP
Ide, allows to set DFRHT module.
The details will be described in the following. From the
main menu of BDTools or MCP Ide select Programming
and then DFRHT Configuration; the following windows will
be shown:
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. [phone] - Fax [phone] – www.duemmegi.it
Rel.: 1.0 October 2011 Page 3 of 5
HOME AND BUILDING AUTOMATION

Domino
DFRHT
Module Address: it is the base address of DFRHT module
to be set or read.
Output Address: when checked, this option enables the 2
output addresses of DFRHT module (the base address will
be the same assigned to the input section).
Read: read the current settings of the selected DFRHT
module.
Program: send the settings displayed in the window to the
memory of the selected DFRHT module.
ID & Ver.: ask the current firmware version to the selected
DFRHT module.
Default: restore the default values in the configuration pan-
el; these one are the following:
✗Address: 1
✗Output address: disabled
✗Threshold 1: 14.0ºC
✗Hysteresis 1: 1.0ºC
✗Threshold 2: 18.0ºC
✗Hysteresis 2: 1.0ºC
✗Temperature offset: 0.0ºC
Close: uit the configuration panel.
Threshold 1 and Threshold : these are the threshold val-
ues 1 and 2 in the non volatile memory of the module, that
will be used when the output address is disabled; allowed
resolution for these values is 0.1ºC.
Hysteresis 1 and Hysteresis : these are the hysteresis
values applied to the threshold 1 and 2 respectively; these
hysteresis will be applied both to the thresholds in the mod-
ule memory and to the thresholds specified by the data
field of the 2 output addresses (if enabled).
Offset: this is a value to be added to the temperature
value read by the sensor, in order to compensate possible
reading errors due to external factors; this value, called off-
set, can be both a positive and negative value and its resol-
ution is 0.1ºC.
Mapping
BDTools and DCP Visio allow to display the map of DFRHT
module as in the following figure.
The values of relative humidity, temperature and dew point
are shown in the 3 text boxes on top side; a graphical rep-
resentation (bar graph) is also provided. The two boxes on
the bottom side show the value related to the two output
addresses (if enabled). Double-clicking with the mouse in
these boxes, the desired value can be entered.
By default the output section is shown as disabled, but if
the output address has been activated, check the option
OUT at the bottom left (OUT).
As usual, the background of the represented module is dis-
played in green color when it is connected and properly op-
erating, otherwise the background will be in red color. The
status of the two digital points is represented by a green
“dot” if the point is not active or red if the point is active.
Technical characteristics
Supply voltage By specific centralized power
supply mod. DFPW2
Current consumption E uivalent to 2 standard Domino
modules
Humidity measurement
Range:
Resolution:
Accuracy:
0 ÷ 100%
0.1 points %
±2 points % in the range 10÷90%
±4 points % outside
Temperature measurement
Range:
Resolution:
Accuracy:
-5 ÷ +50°C
0.1°C
±0.5°C
Calculated Dew Point
resolution
0.1°C
Operating temperature -5 ÷ +50 °C
Storage temperature -20 ÷ +70 °C
Protection degree IP20
Outline dimensions
80mm
80mm 34,2mm
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. [phone] - Fax [phone] – www.duemmegi.it
Rel.: 1.0 October 2011 Page 4 of 5
HOME AND BUILDING AUTOMATION

Domino
DFRHT
Correct disposal of this product
(Waste Electrical & Electronic E uipment)
(Applicable in the European Union and other
European countries with separate collection sys-
tems). This marking on the product, accessories or
literature indicates that the product should not be
disposed of with other household waste at the end
of their working life. To prevent possible harm to
the environment or human health from uncontrolled waste dispos-
al, please separate these items from other types of waste and re-
cycle them responsibly to promote the sustainable reuse of materi-
al resources. Household users should contact either the retailer
where they purchased this product, or their local government of-
fice, for details of where and how they can take these items for en-
vironmentally safe recycling. This product and its electronic ac-
cessories should not be mixed with other commercial wastes for
disposal.
Installation and use restrictions
Standards and regulations
The design and the setting up of electrical systems must be per-
formed according to the relevant standards, guidelines, specifica-
tions and regulations of the relevant country. The installation, con-
figuration and programming of the devices must be carried out by
trained personnel.
The installation and the wiring of the bus line and the related
devices must be performed according to the recommendations of
the manufacturers (reported on the specific data sheet of the
product) and according to the applicable standards.
All the relevant safety regulations, e.g. accident prevention regula-
tions, law on technical work e uipment, must also be observed.
Safety instructions
Protect the unit against moisture, dirt and any kind of damage dur-
ing transport, storage and operation. Do not operate the unit out-
side the specified technical data.
Never open the housing. If not otherwise specified, install in closed
housing (e.g. distribution cabinet). Earth the unit at the terminals
provided, if existing, for this purpose. Do not obstruct cooling of the
units. Keep out of the reach of children.
Setting up
The physical address assignment and the setting of parameters (if
any) must be performed by the specific softwares provided togeth-
er the device or by the specific programmer. For the first installa-
tion of the device proceed according to the following guidelines:
•Check that any voltage supplying the plant has been removed
•Assign the address to module (if any)
•Install and wire the device according to the schematic dia-
grams on the specific data sheet of the product
•Only then switch on the 230Vac supplying the bus power sup-
ply and the other related circuits
Applied standards
This device complies with the essential re uirements of the follow-
ing directives:
2004/108/CE (EMC)
2006/95/CE (Low Voltage)
2002/95/CE (RoHS)
Note
Technical characteristics and this data sheet are subject to change
without notice.
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. [phone] - Fax [phone] – www.duemmegi.it
Rel.: 1.0 October 2011 Page 5 of 5
HOME AND BUILDING AUTOMATION