domat US100 User manual

domat US100 05/2018 Subject to technical changes.. 1
US100
Communicative heating controller
with sunblind control
Summary
US100 is a communicative room heating controller with one PWM output for
control of a radiator or electrical heater, and two digital outputs for sunblind
motor control. It can work autonomously, or in connection to a primary
controller (MiniPLC or SoftPLC), or to a building management system (RcWare
Vision or any SCADA).
Application
▪Systems with radiators, or electric heaters –control and measuring of
room temperature, sunblind manual control and central override
▪monitoring and communication of room temperatures
Function
The controller reads actual room temperature, setpoint set by the pusbuttons, and set
operation status which is set by short push of the central button. The room
temperature is measured in the range of -20 to +50 °C. Measured and set values are
processed in a PI algorithm, at the output of which there is a PWM controlled triac. All
values are displayed on a large LCD display.
The output works either as PWM controlled by a PI controller, or on/off (thermostat).
The functionality and control parameters, i.e. P and I constants, and hysteresis, can be
set with ModComTool, the configuration software, which is free to download at
http://domat-int.com/en/downloads/software.
The digital input may be configured as a window contact (switches to Off) or presence
contact (switches to Standby/Night). It may be set as normally open or normally
closed.
The sunblinds are controlled by the „up“ and „down“ buttons. It is possible to control
the sunblind operation as central building function, such as „fully closed“ at night time,
„fully open“ at strong wind, etc. Those commands must be programmed in the BMS
and communicated over the RS485 bus to the controller.

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The controller contains real time clock with a weekly scheduler (6 events per day). It
changes between three operation modes: Day, Night, and Off. A short push in the
Night mode switches to Party mode –Comfort extension by 2 hours.
The Change-over function (communicated over the bus) switches to the cooling mode
while cooling setpoints come into effect. This mode is used when heat pumps with
change-over mode are installed. The change-over signal is read from the heat pump
interface or a thermostat at the supply water piping, and is transmitted to the
controllers over MiniPLC, UCWEB, or any Modbus master. See Room units and
controllers, Communication protocol description handbook for register addressing and
communication examples.
The communication bus is Modbus RTU over RS485, therefore the controllers are
easily to integrate into any SCADA or BMS system.
Technical data
Power
24 V AC +/- 10%
Consumption
1,5 W + peripherials (ca. 5VA)
Measuring range
-20 ÷ 50 °C
Protection
IP20
Sensor accuracy
according to DIN IEC 751, Class B
Output - heating
1x solid state relay, zero switching, for AC load, 24 V AC
against G0, max. switching current 0,4A; recommended
thermic actuators are Siemens STA71, Danfoss TWA (24V
types) etc.
Outputs - sunblinds
2x solid state relay, zero switching, for AC load, 24 V AC
against G0, max. switching current 0,4A
Input
24 V AC, 7.5 mA
Setpoint correction
according to configuration, +/- 10 to +/- 1 K
Communication
2 wire RS485 - Modbus RTU, slave, optically separated,
1200...115200 bps, bus end switches
Display
LCD 60 x 60 mm
Terminals
screw terminals for 0,14 –1,5 mm2wires
Cover
ABS, similar to RAL9010, other colours
Weight
0,13 kg
Dimensions
see below

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Terminals
1
2
3
4
5
6
7
8
9
Terminals as seen from above in the
bottom part:
1: DI1 presence / window contact input
2: DO1 heating valve output
3: DO2 blinds up output
4: DO3 blinds down output
5: G0 power, input, outputs –
reference point
6: G0 power, input, outputs –
reference point
7: G power
8: K- communication RS485 -
9: K+ communication RS485 +
Motor
connection
Note that the triac outputs must not be connected directly to the sunblind control
motor. They are low-power, low-voltage outputs. Consult the sunblind power control
unit manual if you want to connect US100 to the sunblind control unit. Use ME200, the
relay power module, to control the sunblind motors directly.
DIP switches
Back of the PCB
BUS END: if ON, the bus is terminated (if
last device on the line)
USR: not used, reserved for future
applications
INIT: sets the controller into default
state and sets bus address to 1, baud rate
to 9600. To init, proceed as follows:
- connect the device over RS485 to a PC
with ModComTool config tool
- set INIT to ON
- apply power (use only the connector
without bottom)
- find the controller in the tool (Scan)
- set INIT to OFF
- in the ModComTool tool, open the
controller window
- click the Init button in the tool
- remove and apply power.
Installation
Units are intended for operating in a normal and chemically non-aggressive
environment. They do not need any servicing or maintenance. Install them in a vertical
position at places where they can be operated easily and measure correct values of
temperature, i.e. in the height of about 150 cm, with no direct sunlight or other heat /
cool source (AHU outlets, refridgerator, electrical appliances). The device consists of
two parts: bottom with screw terminal block and cover containing PCB, display, and the
knob. The bottom part is fixed by 2 or 4 screws to any flat surface or a flush-mounting
box Ø 50 mm. At the back of the bottom there is an aperture for cabling. The bottom

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should be installed and cabling connected first, and the upper part inserted after the
construction workshave been finished to prevent damage to the unit.
Seal the conduits to avoid influencing the sensor by draught. Use insulating pad when
installing the sensor on cold walls. Avoid sensor exposition to sunlight or other heat
sources.
Opening the
cover
When removing the display part, proceed as follows:
-press gently the side parts of the unit and pull the right of the display part by
several milimeters
-pull the left of the display part
-pull the display part and remove it from the bottom.
Do notbend the display part too much, the connector pins could be damaged. The locks
are only at the sides of the display part, not at the top nor bottom.
Settings
Temperature correction:
Push the right button to increase setpoint, push the left button to decrease setpoint.
The maximum correction range can be modified over the bus e.g. with the
ModComTool configuration tool.
Sunblind controls:
Push the up / down button shortly to change the slat angle. Hold the up / down button
(>1.5 s) to travel the sunblind up / down. Push the down / up button to stop travelling.
The triacs are deenergized after the sunblind reaches its terminal positions; the
travelling time is configurable with 70 secs default.
It is possible to set and read the sunblind position (0...100 % of travelling time) over the
bus. See Modbus register description.
Operation mode change:
Push the central button shortly (<1 s). Each push changes the operation mode to Party
–Day –Night –Off –Auto.
In the Auto mode, the Day / Night / Off modes change according to time schedule.
The Party mode overrides to Comfort for 120 minutes, then follows the actual time
schedule.

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The weekly time schedule switches between Day, Night, and Off modes according to
the event list. There may be up to 6 events per day.
Time schedule settings:
Switch to the time schedule settings mode with a long central button push (>1 s). The
controller switches to settings mode (clock icon).
Push the left / right buttons to select the weekday (1 to 7). Then short push central
button to confirm the selection. Push the left / right buttons to select the event (large
number 1 to 6). Each event displays the mode activated by this event.
Short push the central button to confirm the event selection. Push the left / right
buttons to select the operation mode (Day, Night, Off, Event inactive) invoked by this
event. If the event is not active, the operation mode is not changed at the set time.
Short push the central button to confirm the operation mode setting. The event time
displays. Push the left / right buttons to set the time of the event and confirm by a short
central button push. Then push the left / right buttons to select another event or long
push the central button and push the left / right buttons to select another weekday.
After all desired events have been edited, long push the central button to leave the
time schedule settings. The controller goes to the basic display mode also after 30
secs of user inactivity.
Change of setpoints and controller time:
Switch to the settings mode with a superlong central button push (>2.5 s). The
controller switches to settings mode (flashing thermometer icon).
Pushing the left / right buttons selects between following settings:
Controller time and day of week (Clock icon, Day of week)
Setpoint temp. Heating Day mode (Temperature, Heating, Day are flashing)
Setpoint temp. Heating Night mode (Temperature, Heating, Night are flashing)
Setpoint temp. Heating Off mode (Temperature, Heating, Empty house are flashing)
Setpoint temp. Cooling Day mode (Temperature, Cooling, Day are flashing)
Setpoint temp. Cooling Night mode (Temperature, Cooling, Night are flashing)
Setpoint temp. Cooling Off mode (Temperature, Cooling, Empty house are flashing)
Select the requested value by a short central button push. Push the left / right buttons
to change value. Confirm by a short central button push again.
If there is no user activity for 30 s, the controller goes to the basic display mode.
Default values:
The default values as well as all other settings (PI parameters, address, baudrate...) can
be set by the configuration program, ModComTool.

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Connection
Connection of power, communication, motors, and valve. Suitable cable types for low
-voltage installations are LAM DATAPAR 2x0.8 (cross-section in mm2), JYTY 2x1
(diameter in mm) etc. If communication and power are in the same cable, use 4-core
LAM DATAPAR 2x2x0.8, JYTY 4x1. Up to 100-120 meters, parallel lines of 24 V and data
bus are no problem. Regarding to EMC it is better if the pairs are twisted, such as with
the LAM DATAPAR or Belden 8205 cable.
A terminal is designed for maximum 3 wires of 0.8 mm2. With cable types as above,
maximum (starting) power of the controller and valve of ca. 7 VA and acceptable
voltage drop of max. 15 %, the maximum cable length for 10 controllers is about 50 m.
If the controllers and valves are at higher distance than 50 m from the transformer or
more valves are connected to the transformer (max. 2 valves per controller), it is more
suitable to supply the controllers locally. The RS485 bus is galvanically separated and
connects all controllers, regardless of the way they are powered.
Temperature
compensation
After switching the unit on, allow about 90 mins to dissipate the heat inside of the
housing. Then the sensor is measuring correctly. Do not change the sensor correction
variable immediately after powering the device on!
1
2
3
4
5
6
78
9
24 V ~
US100
RS 485
G0
IN2
IN1
NO1
NC1
COM1
NO2
NC2
COM2
ME200

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Dimensions
All dimensions in mm.
RoHS notice
The device contains a non-rechargeable battery which backups the real-time clock and
part of the memory. After the device is not operable, please return it to the
manufacturer or dispose of it in compliance with local regulations.

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Changes in
version
09/2016 —Changed the format and reference to the configuration software.
03/2017 —Added picture and description of the installation and link on the datasheet
with other colours.
05/2018 –Change technical data.