Siemens RDB160BN Operator's manual

RDB160BN
Room thermostat with BACnet MS/TP
communication
Basic Documentation
A6V11917618_en
--_b Smart Infrastructure
2020
-03-18

Imprint
2
| 52 A6V11917618_en--_b
Imprint
Delivery and technical specifications subject to change.
Transmittal, reproduction, dissemination and/or editing of this document as
well as utilization of its contents and communication thereof to others without
express authorization are prohibited. Offenders will be held liable for payment
of damages. All rights created by patent grant or registration of a utility model
or design patent are reserved.
Published by:
Siemens Switzerland Ltd
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
Phone: [phone]
www.siemens.com/buildingtechnologies
Edition: 2020-03-18
Document ID: A6V11917618_en--_b
© Siemens Switzerland Ltd, 2020

A6V11917618_en
--_b 3 | 52
Contents
1 About this document ................................................................................. 5
1.1 Purpose of this document .................................................................................. 5
1.2 Revision history.................................................................................................... 5
1.3 Reference documentation .................................................................................. 5
1.4 Before you start ................................................................................................... 5
1.4.1 Copyright .............................................................................................. 5
1.4.2 Quality assurance................................................................................ 5
1.4.3 Document use / request to the reader............................................ 6
1.5 Target audience, prerequisites.......................................................................... 6
2 Overview ..................................................................................................... 7
3 Functions .................................................................................................... 9
3.1 Temperature control............................................................................................ 9
3.2 Operating modes.................................................................................................. 9
4 Applications.............................................................................................. 11
4.1 Overview.............................................................................................................. 11
4.2 Additional functions .......................................................................................... 12
4.3 Control sequences............................................................................................. 14
4.3.1 Overview ............................................................................................. 14
4.3.2 2-pipe fan coil unit............................................................................ 15
4.3.3 2-pipe fan coil unit with electric heater ........................................ 16
4.3.4 4-pipe fan coil unit............................................................................ 17
4.3.5 Chilled ceiling with radiator............................................................. 18
4.3.6 Setpoint and sequences................................................................... 18
5 Control outputs ........................................................................................ 20
5.1 Fan control.......................................................................................................... 21
5.2 Fan operation ..................................................................................................... 22
6 Multifunctional input, digital input ........................................................ 24
7 Type summary.......................................................................................... 25
7.1 Equipment combinations.................................................................................. 25
8 Communication........................................................................................ 27
8.1 BACnet MS/TP................................................................................................... 27
8.2 Communication objects.................................................................................... 28
8.3 Control parameters............................................................................................ 32
8.3.1 Parameter setting via local HMI ..................................................... 33
8.3.2 Parameter list .................................................................................... 33
9 Connection terminals .............................................................................. 39
10 Connection diagrams .............................................................................. 40
11 Dimensions............................................................................................... 42
12 Mounting and installation....................................................................... 43
13 Commissioning......................................................................................... 44
14 Operation .................................................................................................. 46

4
| 52 A6V11917618_en--_b
15 Disposal .................................................................................................... 48
16 Technical data.......................................................................................... 49
Index .................................................................................................................. 51

About this document
Purpose of this document
1
A6V11917618_en
--_b 5 | 52
1About this document
1.1 Purpose of this document
This document provides detailed information on the functions of the RDB160BN
BACnet MS/TP room thermostat as well as on mounting and installing,
commissioning and operating the RDB160BN.
For further information, please refer to chapter 'Reference documentation
[➙5]'.
1.2 Revision history
Edition
Date
Changes
Sections
Pages
1.0
2020-03-10
First Edition
1.1
2020-03-18
Proofread
version:
Phrasal
changes
1.3 Reference documentation
Ref.
Doc No.
Description
[1]
A6V11904646
Mounting instructions RDB160BN
[2]
A6V11913047
Data sheet RDB160BN
1.4 Before you start
1.4.1 Copyright
This document may only be duplicated and distributed with the express
permission of Siemens, and may only be provided to authorized persons or
companies with the required technical knowledge.
1.4.2 Quality assurance
This document was prepared with great care.
●The content of this document is checked at regular intervals.
●Any corrections necessary are included in subsequent versions.
●Documents are automatically amended as a consequence of modifications
and corrections to the products described.
Please make sure that you are aware of the latest document revision date.
If you find any lack of clarity while using this document, or if you have any
criticisms or suggestions, please contact the Product Manager in your nearest
branch office. The addresses of the Siemens Regional Companies are available
at www.buildingtechnologies.siemens.com.

About this document
Target audience, prerequisites
1
6
| 52 A6V11917618_en--_b
1.4.3 Document use / request to the reader
Before using our products, it is important that you read the documents supplied
with or ordered at the same time as the products (equipment, applications,
tools, etc.) carefully and in full.
We assume that persons using our products and documents are authorized and
trained appropriately and have the technical knowledge required to use our
products as intended.
More information on the products and applications is available:
●On the intranet (Siemens employees only) at
https://workspace.sbt.siemens.com/content/00001123/default.aspx.
●From the Siemens branch office near you
www.buildingtechnologies.siemens.com or from your system supplier.
●From the support team at headquarters fieldsupport-
[e-mail] if there is no local point of contact.
Siemens assumes no liability to the extent allowed under the law for any losses
resulting from a failure to comply with the aforementioned points or for the
improper compliance of the same.
1.5 Target audience, prerequisites
Product and sales managers, distributors, re-sellers and OEM customers who
use RDB160BN room thermostats in the BACnet MS/TP network.

Overview
2
A6V11917618_en
--_b 7 | 52
2Overview
Use
The RDB160BN BACnet MS/TP room thermostats are used for the following
types of system:
●Fan coils with On/Off, modulating or DC control outputs (electric heater
only with On/Off output):
–2-pipe system
–2-pipe system with electric heater
–4-pipe system
●Chilled/heated ceilings (or radiators) with On/Off, modulating or DC control
outputs (electric heater only with On/Off output):
–Chilled/heated ceiling
–Chilled/heated ceiling with electric heater
–Chilled ceiling with radiator
The RDB160BN controls:
●One 1-speed, 2-speed, 3-speed or DC fan
●Up to two On/Off, PWM, DC 0…10 V or one 3-position valve actuators
The RDB160BN is used in systems with:
●Heating or cooling mode
●Automatic heating/cooling changeover
●Heating and cooling mode (e.g. 4-pipe system)
General functions
●Room temperature control with built-in temperature sensor, external room
temperature or return air temperature sensor
●Changeover between heating and cooling mode (automatic with local
sensor or BACnet object)
●Backlight LCD
●Supply air limitation
●Automatic valve exercise
●Mold protection
●Operating modes selectable via On/Off button: Comfort, Standby (Economy)
and OFF
●Advanced fan control function, e.g. selectable fan operation (enable, disable
or based on heating or cooling mode)
Setpoints and display
●Minimum and maximum limitation of room temperature setpoint
●Display of temperature or setpoint
●Button lock
Fan
●1-speed, 2-speed, 3-speed or DC 0...10 V fan control (automatically or
manually)

Overview
2
8
| 52 A6V11917618_en--_b
Inputs
●One analog input for:
–External room temperature or return air temperature sensor
–Supply air temperature limitation sensor
●One universal input for:
–Changeover digital
–Changeover analog
–Window contact
●One digital input
–Presence input
–Window contact
BACnet MS/TP communication
Device address
The BACnet MS/TP MAC address can be set from 0 to 127.
Factory setting is from 0 to 99.
Baud rate
The baud rate is selectable. Four options are available for the RDB160BN:
9600, 19200, 38400 and 76800 (default setting) bps.
The RDB160BN BACnet MS/TP room thermostats are delivered with a fixed set
of applications and related parameters.
The relevant application is selected and activated during commissioning using
the local HMI or the BACnet MS/TP commissioning tools.
For detailed information about the applications, please refer to chapter
'Applications'.

Functions
Temperature control
3
A6V11917618_en
--_b 9 | 52
3Functions
3.1 Temperature control
The RDB160BN BACnet MS/TP room thermostat controls the room
temperature with a built-in temperature sensor, an external room temperature
sensor (QAA2012) or an external return air temperature sensor (QAP2012.150).
It maintains the setpoint temperature by sending actuator control commands to
the heating and/or cooling equipment.
The following control outputs are available:
●On/Off control (2-position)
●Modulating PI/P control with PWM output
●Modulating PI/P control with DC 0...10 V control output
●Modulating PI/P control with 3-position control output (only for 2-pipe
applications)
The switching differential or proportional band is 10 K for heating and cooling
mode, and it is set via parameter P08. The integral action time for modulating
PI control is 300 seconds. It is set via parameter P09.
Display
The display shows the current room temperature or the Comfort setpoint
temperature. Both are selectable via parameter P24. Factory setting is the
display of the current room temperature.
Heating / cooling changeover
Changeover between heating and cooling mode is automatically controlled with
a local sensor or a BACnet object.
The HEAT / COOL symbols indicate that the system currently heats or cools.
Either heating or cooling output is activated.
For detailed information about setting the control parameters refer to chapter
'Control parameters [➙32]'.
3.2 Operating modes
The RDB160BN BACnet MS/TP room thermostats have different operating
modes. The operating modes can be changed via On/Off button, switch over
contact or BACnet. Specific heating and cooling setpoints are assigned to each
operating mode.
Room operating mode: Preselection
The Preselection operating mode can be selected via BACnet. In Preselection
operating mode, Comfort, Standby (Economy) or OFF mode can be selected.
●If a bus command is received via BACnet for either Comfort or Standby
(Economy) mode, the symbol of the selected operating mode is displayed
(either or ˈSTANDBYˈ).
●If a bus command is received for OFF mode, only ˈOFFˈ is displayed, and all
key buttons are deactivated, except for the On/Off button.

Functions
Operating modes
3
10
| 52 A6V11917618_en--_b
Comfort mode
In Comfort mode, the thermostat maintains the Comfort setpoint temperature.
The setpoint can be defined via parameter P64, locally adjusted via the
Up/Down buttons or remotely selected via BACnet. Factory setting is 22 °C.
The Comfort mode change can be delayed, typically used in combination with a
presence detector:
●Delay from Comfort to Standby (Economy) mode is defined via parameter
P11.
●Delay from Standby (Economy) to Comfort mode is defined via parameter
P12.
●In Comfort mode, the fan can be set to automatic or manual fan speed:
Low, medium or high.
Standby (Economy)
In Standby (Economy) mode, a preset setpoint can be defined via parameters
P06 and P07. Factory setting is 15 °C for heating and 30 °C for cooling.
The thermostat switches to Standby (Economy) mode
●If Standby (Economy) is sent via BACnet
●If the thermostat gets an operating mode switchover contact (e.g. keycard
contact or presence detector).
OFF mode
The thermostat and the fan are switched off, and the thermostat gets no
heating or cooling output. Mold protection function can overrun the fan speed.
NOTICE
No protecting heating or cooling control in OFF mode
Risk of frost or risk of over temperature
For more information about the thermostat functions refer to chapter
'Additional functions [➙12]'.

Applications
Overview
4
A6V11917618_en
--_b 11 | 52
4Applications
4.1 Overview
The RDB160BN BACnet MS/TP room thermostats support the following
applications. The applications can be configured using the local parameter
setting or via the system.
Applications, control outputs
●
2-pipe fan coil
●
2-pipe fan coil with
electric heater
●
4-pipe fan coil
●
Chilled/heated
ceiling
●
Chilled/heated
ceiling with electric
heater
●
Chilled ceiling with
radiator
YHC
Heating/cooling valve
actuator
M1
1-speed, 2-speed or 3-speed fan
YH
Heating valve actuator
B1
Return air temperature sensor or
external room temperature sensor
(optional)
YC
Cooling valve actuator
B2
Changeover sensor (optional)
YE
Electric heater
(B1)
M1
YHC
T
B2
T
T
(B1)
YHC
M1
T
YE
T
(B1)
T
(B1)
B2
T
YC
YH
M1
(B1)
T
(B1)
3191S11
N1
T
B1
T
B2
T
YHC
3191S12
N1
T
B1
T
B2
T
YHC
3191S13
N1
T
B1
T
YC
YH

Applications
Additional functions
4
12
| 52 A6V11917618_en--_b
Possible output combinations
2-pipe
2-pipe with electric
heater
4-pipe
Fan
1/2/3-speed
DC 0…10 V
1/2/3-speed
DC 0…10 V
1/2/3-speed
DC 0…10 V
Output #1
On/Off, PWM, 3-position,
DC 0…10 V
On/Off, PWM, DC 0…10 V
On/Off,
PWM,
DC 0…10 V
On/Off
, PWM
DC 0…10 V
Output #2
n.a.
On/Off
On/Off, PWM
4.2 Additional functions
Heating / cooling changeover via BACnet
Heating / cooling changeover is a function that enables 2-pipe systems to use
the same pipe for both heating and cooling control. Heating control is normally
required in winter when the outside temperatures are low, while cooling control
is normally required in summer.
The heating / cooling changeover signal can be received via BACnet.
In case there is no changeover signal, e.g. due to problems with data
communication or power failure, the thermostat operates in the last valid
operating mode (heating or cooling).
Automatic heating / cooling changeover via changeover sensor
If a cable temperature sensor (QAP2012.150) is connected to the input terminal
UI, and if parameter P14 is set to 2, the thermostat changes between heating
and cooling mode according to the water temperature measured by the
changeover sensor:
●If the water temperature is above 28 °C, the thermostat changes over to
heating mode and stays in heating mode until the temperature falls below
16 °C.
●If the water temperature is below 16 °C, the thermostat changes over to
cooling mode and stays in cooling mode until the temperature rises above
28 °C.
The water temperature is defined via BACnet object.
Changeover switch
The sensor QAP2012.150 or any other PT1000 cable temperature sensor for
automatic heating / cooling changeover can be replaced by an external switch
for manual, remote changeover by setting P14 to 1.
●Contact open: Heating mode
●Contact closed: Cooling mode
The sensor or switch can be connected to input terminal U1. See also chapter
'Multifunctional input, digital input [➙24]'.
T
T °C
M
UI
M
UI

Applications
Additional functions
4
A6V11917618_en
--_b 13 | 52
External / return air temperature sensor
The thermostat measures the room temperature with a built-in sensor, an
external room temperature sensor (QAA2012) or an external return air
temperature sensor (QAP2012.150) connected to a multifunctional input AI.
Input AI must be commissioned accordingly.
For detailed information about the input settings refer to chapter
'Multifunctional input, digital input [➙24]'.
Mold protection
Mold protection helps to avoid damage from moisture due to a lack of air
circulation. In very warm and humid climates, the fan can be operated
continuously at a low speed in all operating modes. Mold protection can be
activated via parameter P04.
Chilled / heated ceiling
Both heating and cooling sequences can also be used for chilled / heated
ceiling.
Fan coil unit heating / cooling sequences for ceiling application can be used by
disabling the fan via parameter P25 and locking the fan button via parameter
P66.
Dew point monitoring
Dew point monitoring is essential to avoid condensation on the chilled ceiling. It
helps to avoid damage to the building. Cooling with a disabled fan can be set
via parameter P25. An external dew point monitoring must be installed.
A contact can be used on the digital input (DI) to switch off all outputs and
prevent condensation.
Key lock
A combination of keys can be defined via parameter P65 or via BACnet object
to lock or unlock to users.
Configuration
options P65
Fan button /
On/Off button
Active
Setpoint
Up/Down
buttons
Active
Fan button
Active
0
1
X
2
X
3
X
X
4
X
5
X
X
6
X
X
7 (Factory setting)
X
X
X
Lock setting access
Access to parameter settings can be blocked while all buttons are active for
standard operation. This function must be activated via BACnet.

Applications
Control sequences
4
14
| 52 A6V11917618_en--_b
Blocking a device during fire alarms
The RDB160BN thermostat can be completely blocked during fire alarms. This
function can only be activated via BACnet (Binary value, 9).
If the current value has not been previously set to 0, the function forces the unit
to OFF mode and prevents it from being reactivated. In this case, the device
cannot be started via the On/Off button while this function is active.
Supply air temperature limitation function and cascade control
The analog input AI can be configured for use with a supply air temperature
limitation sensor. The thermostat automatically switches to cascade control.
There are four values for minimum and maximum air temperature limitation.
The setting range is 10 °C...50 °C and the default settings are as follows:
Heating mode
Cooling mode
Min. (P71)
24 °C (default)
Min. (P73)
12 °C (default)
Max. (P70)
35 °C (default)
Max. (P72)
24 °C (default)
In cascade mode, the room thermostat works together with the supply air
temperature limitation controller using cascade control. In cascade control, the
supply of air temperature is calculated to maintain the room temperature
setpoint.
The Cascade factor consists of the supply air controller being faster than the
room thermostat. The Cascade factor (P74) acts as a divisor which affects both
the proportional band (P08) and Integration time (P09).
Example: If the Cascade factor is 3 (default) and the room thermostat has a
proportional band of 10 K and an integration time of 300 seconds, the supply air
controller receives a proportional band of 3 K and an integration time of
100 seconds. In other words, the supply air controller is three times faster than
the room thermostat.
Window state
The thermostat stops heating and cooling control. The fan turns off unless mold
protection or cooling of an electric heater has been selected. The potential-free
window contact is connected to inputs DI or U1 and must be configured via
parameters P03 and P14.
Window state mode is sent via BACnet.
Setpoint limitation
For energy saving purposes, the setpoint setting offset can be limited via
parameter P34 (upward) and parameter P35 (downward).
4.3 Control sequences
4.3.1 Overview
The main control sequence (e.g. the water coil sequence of the fan coil unit)
can be set via parameter P02.
The following sequences can be activated in the thermostats. The available
sequences depend on the application, which is selected via parameter P01.
For detailed information about the applications refer to chapter 'Applications
[➙11]'.

Applications
Control sequences
4
A6V11917618_en
--_b 15 | 52
Parameter
P02 = 0
P02 = 1
P02 = 2
Sequence
Available for basic
application ¹
Heating
Cooling
= heating
sequence for el.
heater
Automatic heating
/ cooling
changeover via
external water
temperature
sensor or remote
switch
2-pipe
2-pipe & el. heater
4-pipe
✔ ✔ ✔
Notes:
¹ For chilled ceiling with radiator applications refer to chapter 'Chilled ceiling
with radiator [➙18]'.
For the relation between setpoints and sequences refer to chapter 'Setpoint
and sequences [➙18]'.
4.3.2 2-pipe fan coil unit
In 2-pipe applications, the thermostat controls a valve in heating / cooling
mode with automatic changeover (heating only or cooling only). Factory setting
is heating / cooling automatic changeover (P02 = 1).
On/Off control
Control sequence On/Off output:
The diagrams below show the control sequence for 2-position control.
Heating mode
Cooling mode
T[°C]
Room temperature
V1
Control command 'Valve'
W
Room temperature setpoint
ΔT
Hysteresis (P10)
T °C
T °C
T °C
T
wT [°C]
T
V1
1
0
Y
w
T [°C]
T
V1
1
0
Y

Applications
Control sequences
4
16
| 52 A6V11917618_en--_b
Modulating control
Control sequence modulating output, PWM, DC 0…10 V or 3-position:
The diagrams below show the control sequence for modulating PI control.
Heating and cooling mode
Cooling mode
T[°C]
Room temperature
V1
Control command 'Valve'
W
Room temperature setpoint
Xp
Proportional band (P08)
NOTICE
The diagrams only show the PI proportional part of the thermostat.
For detailed information about setting the sequence and the control outputs
refer to chapters 'Applications [➙11]', 'Setpoint and sequences [➙18]' and
'Control outputs [➙20]'.
4.3.3 2-pipe fan coil unit with electric heater
Heating or cooling with auxiliary heater
In 2-pipe applications with an electric heater, the thermostat controls a valve in
heating or cooling mode based on the changeover: Heating only or cooling only
with electric heater. Parameter P01 is set to 4.
The electric heater can only be controlled with output DO5 (Triac) with an
On/Off control logic. An external relay is used if the Triac power rating is
insufficient.
Electric heating, active in cooling mode
In cooling mode, the valve receives an 'Open' command if the measured
temperature is above the setpoint temperature.
The electric heater receives an 'On' command if the measured room
temperature drops below the setpoint temperature minus dead zone
(parameter P05) and hysteresis (parameter P10).
Electric heating in heating mode
In heating mode, the valve receives an 'Open' command if the measured
temperature is below the setpoint temperature. The electric heater is used as
an additional heating source when the heating energy controlled by the valve is
insufficient.
The electric heater receives an 'On' command if the temperature is below the
setpoint temperature minus hysteresis (parameter P10) and the first heating
sequence has reached 100 %.
T [°C]
V1
100
0
Y [%]
X
P
w
T [°C]
V1
100
0
Y [%]
X
P
w

Applications
Control sequences
4
A6V11917618_en
--_b 17 | 52
WARNING
An electric heater must always be protected by a safety limit thermostat!
4.3.4 4-pipe fan coil unit
Heating and cooling
In 4-pipe applications, the thermostat controls two valves in heating and
cooling mode. 4-pipe application is the default setting for parameter P01 (P01
= 03).
The diagrams below show the control sequence for 2-position control.
On/Off control
Heating and cooling mode
T[°C
]
Room temperature
W
Room temperature setpoint
V1
Control command 'Valve' (H)
V2
Control command 'Valve' (C)
ΔT
Hysteresis (P10)
X
d
Dead zone (dead band) (P08)
Modulating control
PWM, DC 0…10 V or 3-position
Heating and cooling mode
T[°C
]
Room temperature
W
Room temperature setpoint
V1
Control command 'Valve' (H)
V2
Control command 'Valve' (C)
ΔT
Hysteresis (P10)
X
d
Dead zone (dead band) (P08)
NOTICE
The diagrams only show the PI proportional part of the thermostat.
For detailed information about setting the sequence and the control outputs
refer to chapters 'Applications [➙11]', 'Setpoint and sequences [➙18]' and
'Control outputs [➙20]'.
T
V1
1
0
Y
wT [°C]
T
V2
XDZ
V1
100
0
Y [%]
wT [°C]
V2
X
DZ
X
P
X
P

Applications
Control sequences
4
18
| 52 A6V11917618_en--_b
4.3.5 Chilled ceiling with radiator
For chilled ceiling with radiator, set the corresponding basic application and
disable the fan via parameter P25.
The following applications are available:
Application for
chilled / heated
ceiling, radiator
Set basic
application
Refer to chapter
Sequences
Chilled / heated
ceiling with
changeover
2-pip
2-pipe fan coil
unit [➙15]
Chilled / heated
ceiling & el heater
2-pipe with
electric heater
2-pipe fan coil
unit with electric
heater [➙16]
Chilled ceiling
with radiator
4-pipe
4-pipe fan coil
unit [➙17]
4.3.6 Setpoint and sequences
2-pipe applications
In changeover applications, the Comfort setpoints (W) for the heating and
cooling sequence are the same.
In 2-pipe applications with electric heater, the Comfort setpoint is either in the
first heating sequence (in heating mode) or in the cooling sequence (in cooling
mode).
The setpoints for Standby (Economy) mode and Protection mode are below the
Comfort setpoint for heating and above the Comfort setpoint for cooling.
The heating and cooling setpoints for Standby (Economy) mode can be set via
parameters P06 and P07.
Application
Comfort mode
Standby (Economy) mode
Heating
Cooling
Heating
Cooling
2-pipe
2-pipe &
electric heater
W
Setpoint for Comfort mode P64
W
HeatEco
t
Heating setpoint for Standby (Economy) mode, P06
W
CoolEco/
Cooling setpoint for Standby (Economy) mode, P07
E1
Electric heater sequence
T
W
Y
T
W
Y
T
W
HeatEco
Y
T
Y
WCoolEco
W
Y
2)
E1
T
W
Y
E1
1)
T
W
HeatEco
Y
E1
2)
T
Y
W
CoolEco
E1
1)
T
W
HeatEco

Applications
Control sequences
4
A6V11917618_en
--_b 19 | 52
4-pipe applications
In 4-pipe applications, the Comfort setpoint (W) is in the middle of the dead
zone, between the heating and cooling sequence.
The dead zone can be defined via parameter P05.
Application
Comfort mode
Standby (Economy)
mode
Heating and cooling
Heating and/or cooling
4-pipe
W
Setpoint for Comfort mode, P64
W
HeatEco/
Heating setpoint for Standby (Economy) mode, P06
W
CoolEco/
Cooling setpoint for Standby (Economy) mode, P07
E1
Electric heater sequence
Y
W
T
Y
W
CoolEco
T
W
HeatEco

Control outputs
Control sequences
5
20
| 52 A6V11917618_en--_b
5Control outputs
Different control output signals are available; they are defined during
commissioning (see below).
Product no. /
Control output
2-position (PWN
or On/Off)
DC 0…10 V
3-position
RDB160BN
DO4, DO5
(2x Triac)
AO1, AO2 1)
DO4, DO5 2)
(1x / )
1) AO2 is shared with DC 0…10 V fan and can be used for valve actuators only
with 1-, 2- or 3-speed fan application.
2) Only available for 2-pipe applications
On/Off and PWM control signal (2-position)
If the measured room temperature is below the setpoint (heating mode) or
above the setpoint (cooling mode), the valve receives the 'Open' or 'On'
command via control output DO4 or DO5. The valve receives the 'Off' command
if the measured room temperature is above the setpoint (heating mode) or
below the setpoint (cooling mode).
The control hysteresis of On/Off control output can be set via parameter P10.
The factory setting is 1 K.
The pulse degree of the PWM output can be set for heating (DO4) and cooling
(DO5) valve independently via parameters P18 and P19. The factory setting is
60 seconds.
Electric heater control signal (2-position)
The electric heater receives the 'On' command via the DO5 output with On/Off
logic only if the measured room temperature is below the setpoint for the
electric heater.
It receives the 'Off' command if the measured room temperature is above the
setpoint for electric heater.
CAUTION
Overtemperature
To avoid overtemperature, a safety limit thermostat must be provided
externally.
3-position control signal
Output AO4 provides the 'Open' command, and AO5 the 'Close' command to the
3-position actuator.
The factory setting for the actuator's running time is 120 seconds. It can be
defined via parameter P20.
Valve exercising feature
The valves are operated from time to time to prevent them from seizing after
long periods of inactivity. For example, in winter, only heating valves are used
and thus, cooling valves must also be operated from time to time so that they
do not get stuck in one position.
The time between two exercises is set via parameter P22 for the heating
actuator and P23 for the cooling actuator. The default setting is 23 hours.