Siemens RRV851 User manual

CE1N2725en
27.08.2007
Building Technologies
HVAC Products
2725
Temperature controller
for ducted systems RRV851
Multifunctional controller used for central control of ducted HVAC systems in
connection with a QAX850 master room unit.
Standard model without zoning functions.
Use
Comfort control of ducted HVAC systems via fan, heating and cooling output:
•Apartments
•Single-family houses
•Autonomous light commercial applications
The RRV851 controller is designed for central ducted HVAC systems that require easy
operation by the building occupant. The MMI to be connected to the controller is the
QAX850 master room unit. Fan, heating and / or cooling outputs control the
temperature in the building. The RRV851 controller can be configured for various types
of HVAC equipment. These include:
•Heating only ducted systems
•Cooling only ducted systems
•DX cooling and heating (1-speed fan on heating)
•DX cooling and heating (3-speed fan)
•Air-to-air heat pumps
•Water-to-air heat pumps
•4-pipe FCU
•2-pipe FCU
•1- or 3-speed fans
Applications

2/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Functions
The controller’s functionality is determined by the application selected with the DIP
switches, parameter settings and operating mode selection via the QAX850 master
room unit.
FCU
N2
T
B1
HB B1 Y2Y1 Y3
Q7Q8Q9
H1
SAF
D2 D1
Y1
D1
N1
Y2
C1
D2
2725A01
B1 Optional remote temp. sensor N1 RRV851 controller
C1 Cooling coil N2 QAX850 master room unit
D1 Remote comfort mode input SAF Supply air fan
D2 Fault or emergency heat input Y1 Cooling control valve
FCU Fan coil unit Y2 Heating control valve
H1 Heating coil
Type summary
Type reference Description Compatible with
RRV851 Temperature controller •QAX850 Master room unit
•QAA32 Room temperature sensor
•QAH11.1 Cable temperature sensor
The QAX850 is the master MMI for the RRV851 and must be ordered as a separate
item. Any additional remote temperature sensors must also be ordered separately.
Terminal covers are included in the RRV851 box.
Not suitable for use with the Desigo RX range of wall-mounted units.
Product documentation
Document Document number
Data sheet N2725
Installation instructions G2725
Operating instructions, with QAX850 room unit B2725en01
Application manual A2725
Declaration of conformity T2725
Document and unit type Document number
Data sheet QAX850 N2722
Mounting instructions QAX850 M2721
Application example:
4-pipe FCU system
Note
Supporting
documentation

3/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Mechanical design
The RRV851 is a temperature controller providing connection of power supply,
inputs/outputs and QAX850 master room unit.
2725Z01
The unit consists of the following components:
•Base for DIN rail or screwed surface-mounting
•Cable strain reliefs
•IP30 covers (when mounted directly to the wall or FCU without DIN rail)
•PCB and built-in transformer
•PCB cover
•Input / output terminals
•RS-485 terminals
•MMI bus terminals
•LED for power supply indication
•Configuration DIP switches
Low-voltage power supply (DC 12 V) and communication transfer is supplied via two
wires to the QAX850 from terminals HB+ and HB–. The LED on the QAX850 will flash if
a communication error exists between RRV851 and QAX850 for longer than 5 seconds.
The RS-485 connections are only suitable for downloading manufacturer specific
parameter sets. This is for factory use only.
Two digital inputs are provided. A potential-free contact closed across the D1 and
D_GND terminals will override to Comfort mode only when the mode selector is set to
Auto Timer mode. D2 can be configured for an emergency heating enable signal or an
external fault lockout signal. Either of these functions can be selected via the
configuration DIP switches.
When emergency heating is selected, a potential-free contact closed across the D2 and
D_GND terminals will disable the primary heating output and enable the emergency
heating output. The emergency heating output will only be activated when there is
demand for heating. Not available on applications A2, A3, A4, and A5.
When external fault (default) is selected, a potential-free contact closed across the D2
and D_GND terminals will deactivate all outputs and the standby icon on the QAX850
LCD will flash to indicate the fault. The fault will disappear after the contact is opened.
An NTC temperature sensor can be connected to the B1 and M terminals for the
following functions:
Connection terminals
Bus interface
(HB+ HB–)
RS-485
(TX+, TX–)
Digital inputs
(D1, D2)
Temperature sensor
input (B1, M)

4/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
•Remote room temperature sensing: The QAX850 can be used as a master control
unit without using the built-in temperature sensor. A separate room sensor (QAA32)
can be mounted in a location more convenient for accurate temperature acquisition
•Return air temperature sensing: A temperature sensor (QAH11.1) can be mounted in
the return air path of the FCU if accurate temperature acquisition in the room is not
possible
•2-pipe application heating/cooling changeover: For application A8 (2-pipe FCU) a
temperature sensor (QAH11.1/ARG86.3) is clamped to the water pipe in order to
activate heating/cooling mode changeover
The RRV851 controller can be configured for a 1- or 3-speed fan. Voltage-free (SPST)
relay outputs Q74, Q84 and Q94 can switch loads up to AC 250 V, 6 (4) A. Power is
supplied via terminal Q71. The low-speed terminal is used when a 1-speed fan is
configured. On fan startup, high-speed will be activated first for approximately
3 seconds and then resume the selected speed. In Auto Fan mode, the fan speeds will
be activated automatically depending on demand.
For further details on auto fan speed control, refer to the Application Manual.
•Output Y1: Cooling or compressor output
•Output Y2: Heating or reversing valve output
•Output Y3: Auxiliary output that can be configured for auxiliary heating, emergency
heating, 2nd step cooling or dual compressor
Output control is 2-position. 3-position modulating can be selected via parameter P17
for applications A1, A2 and A8 only.
Configuration
Initial application setup of the RRV851 controller to match the connected HVAC
equipment is made by the selection of DIP switch positions. DIP switches are located
on the top of the controller. An adhesive label is included in the RRV851 packaging box
for the final recording of the DIP switch positions. This can be placed on the DIP switch
block to avoid unauthorized changes. Further parameter settings can be made via the
QAX850 if required.
Function Selections 1 2 3 4 5 6 7
Auxiliary heating 20 min delay off off - - - - -
Auxiliary heating 10 min delay on off - - - - -
Emergency heating via D2 off on - - - - -
Y3
Auxiliary
output
2nd stage cool or compressor on on - - - - -
Single speed - - off - - - -Fan
speed Three speed - - on - - - -
A1 – Heating only - - - off off off off
A2 – Cooling only - - - on off off off
A3 – Cool./(heat. 3 speed fan) - - - off on off off
A4 – Cool./(heat. 1 speed fan) - - - on on off off
A5 – Heat pump (comp + RV) - - - off off on off
A6 – Heat pump (heat/cool) - - - on off on off
A7 – 4-pipe FCU - - - off on on off
Applica-
tion
A8 – 2-pipe FCU - - - on on on off
Default (as delivered) positions are in bold text.
Fan speed outputs
Heat/cool outputs
DIP switches
DIP switch settings

5/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Commissioning notes
When powering up, the QAX850 will display all LCD icons for approximately 3 seconds,
and then the software version number for another 3 seconds. It will then revert to the
normal display. The time segments will be blinking if the time needs to be set. Set the
time of day as per Operating Instructions. There will be a delay before operation
commences due to polling of all values.
The user should not have access to the DIP switches or parameter settings. User
operation is via the QAX850 master room unit. For user operation details, refer to the
Operating Instructions included in the packaging box (document B2725en.01).
Generally, there is no need to recalibrate the sensor. However, the room temperature
displayed on the QAX850 LCD can be recalibrated if there is any discrepancy from the
actual temperature measured with a certified thermometer. The calibration function can
be accessed by pressing simultaneously the and buttons for 5 seconds. The
displayed value can then be adjusted via the same buttons in increments of 0.1 K. The
range is ±3 K.
The RRV851 controller is operational after the DIP switch settings have been made and
power is connected. Default parameter settings are based on the application selected
and may be modified if required. Refer to the list below. Parameters cannot be
accessed if the system is in Off mode. Refer to the Installation Instructions for setup
details and the Application Manual for default parameter values.
No. Parameter Range
P00 Temperature scale °C / F°
P01 Frost protection limit in Off mode Off / 5…8 °C
P02 Overtemperature limit in Off mode Off / 30…35 °C
P03 Min. off time delay 0…600 s
P04 Min. on time delay 0…600 s
P05 Dead band between cooling and heating off points 0.5…6 K
P06 RV on in heating or cooling mode Heating/Cooling
P07 Fan run on after heating output turns off 0…300 s
P08 Fan run on after cooling output turns off 0…300 s
P09 FCU flush pipe time 120…600 s
P11 Water temperature heating mode changeover 22…32 °C
P12 Water temperature cooling mode changeover 10…21 °C
P13 Fan auto speed high range H: 80…100 %
P14 Fan auto speed medium range M: 30…75 %
P15 Fan auto speed low range L: 1…15 %
P17 2- or 3-position control selection 2-pos / 3-pos
P18 P-band in heating mode / switching differential 0.5…10 K
P19 P-band in cooling mode / switching differential 0.5…10 K
P20 Integration time 0…60.0 min in
0.5 min steps
P21 3-position valve actuator running time 50…300 s
P23 Ventilation in dead zone Off, H/C, C only
Response on startup
User operation
Sensor calibration
Commissioning
Setup parameters

6/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Mounting and installation notes
The RRV851 controller can be mounted in any orientation using the following fixing
options:
DIN rail mounting
The housing base is designed for snap-
mounting on DIN rails conforming to
EN 50022-35 × 7.5 (can be released
with a screwdriver).
Surface mounting
There are 2 drill holes for screw-mounting
(refer to “Dimensions”).
Screws: Max. diameter 3.5 mm, min. length
38 mm.
When mounting, note the following:
•The controller should not be freely accessible after mounting
•Ensure adequate air circulation to dissipate heat generated during operation
•Easy access is required for service personnel
•Local installation regulations must be observed
The Mounting Instructions are included in the RRV851 controller packaging.
When not mounting within a panel, cable strain
reliefs must be used for all wiring to (AC 230 V)
terminals. The conductors must be secured with
cable ties (see diagram).
Cable strain reliefs should be used for all wiring
to avoid disconnection.
2725Z02
Terminal covers are provided in the RRV851 packaging box. The covers include
screws for fixing to the controller and knockout holes for cable entry. Covers should
only be used where suitable access is restricted to authorized personnel and there is
protection from ambient conditions. The covers will provide IP30 protection when
surface-mounted on the wall or FCU.
Removing the terminal covers
STOP Note!
Terminal covers

7/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Technical data
Power supply (L, N) Rated voltage AC 230 V, +10 %, –15 %
Requirement for transformers for switch mode
power supplies
EN 61 558-2-6
Frequency 50 / 60 Hz
Power consumption (excl. external modules) 12 VA
Supply line fusing max. 10 A
Functional data Reserve of clock max. 20 min
Analogy input (B1, M) Passive sensor NTC resistor, 3 kΩat 25 °C
Measuring range 0…49 °C
Digital input (D1, D2) Contact sensing
Voltage
Current
max. DC 5 V
typically 8 mA
Requirements for status and impulse contacts
Signal coupling
Type of contact
Insulating strength against main potential
Potential-free
Maintained or impulse contacts
AC 3750 V to EN 60 730
Switching outputs
External supply line fusing
Non-renewable fuse (slow)
Automatic line cutout
Release characteristic
max. 10 A
max. 13 A
B, C, D to EN 60 898
Relay contacts (Y1x, Y2x, Y3x)
Relay output
Switching voltage
AC current
At 250 V
At 19 V
Switch-on current
Contact life
potential-free
max AC 250 V
min. AC 19 V
max. 3 A res., 1 A ind. (cos φ= 0.6)
min. 5 mA
min. 20 mA
max. 5 A (1 s)
1 × 105cycles
Boiler (Q1x) Relay contacts (Q7x)
Relay output
Switching voltage
AC current
At 250 V
At 19 V
Switch-on current
Contact life
potential-free
max. AC 250 V
min. AC 19 V
max. 6 A res., 4 A ind. (cos φ= 0.6)
min. 5 mA
min. 20 ma
max. 10 A (1 s)
1 × 105cycles
Insulating strength
Between relay contacts and system electronics
(reinforced insulation)
Between neighboring relay contacts
(operational insulation)
Y1x⇔Y2x⇔Y3x⇔Q7x⇔Q8x⇔Q9x
AC 3750 V, to EN 60 730-1
AC 1250 V, to EN 60 730-1
Interfaces (S+, SG) HCC bus proprietary protocol
Bus power supply voltage DC 12 V, +10, –15% (supply to room
unit QAX850)

8/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Baud rate 9.6 kbit/s
Permissible cable lengths For bus communication
A ≥0.5 mm²
A ≥1 mm²
max. 60 m
max. 100 m
Type of cable 2-wire standard installation cable
(unshielded)
Note:
Twisted pair (unshielded) is recommended for enhanced
immunity to external electromagnetic interference, e.g. in the
vicinity of radio transmitters or variable speed drives
Electrical connections
(all terminals) Connection terminals
For wires
screw terminals
0.6 mm dia. … 2.5 mm2
Degrees of protection Degree of protection of housing to IEC 60 529 IP 20 without terminal covers
IP 30 with terminal covers
Safety class to EN 60 730 device suited for use with equipment
of safety class II
Environmental conditions Operation to
Climate conditions
Temperature (housing and electronics)
Humidity
Mechanical conditions
IEC 721-3-3
class 3K5
0…50 °C
5…95 % r. h. (non-condensing)
class 3M2
Transport to
Climate conditions
Temperature
Humidity
Mechanical condition
IEC 721-3-2
class 2K3
–25…+70 °C
<95 % r. h.
class 2M2
Classification to EN 60 730 Mode of operation, automatic controls type 1B
Degree of contamination, controls Environment 2
Rated surge voltage 4000 V
Software class A
Materials and colors Controller housing Polycarbonate, RAL 7035 (lightgrey)
Packaging corrugated cardboard
Norms and standards Product safety
Automatic electrical controls for household and
similar use
Special requirements for temperature sensing
controls
EN 60 730-1
EN 60 730-2-9
Electromagnetic compatibility
Immunity domestic section, light industry
Emissions domestic section, light industry
EN 61 000-6-1
EN 61 000-6-3
-conformity
EMC directive
Low-voltage directive
89/336/EEC
73/23/EEC
N474 conformity to
Australian EMC framework
Radio interference emission Standard
Radio Communication Act 1992
AS/NZS 4251.1
Weight Excluding packaging approx. 0.735 kg

9/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Connection terminals
B1 Signal input (external sensor NTC)
M Signal ground
D1, D2 Digital inputs
D_GND Digital ground
HB+ HB– Communication bus
L, N AC 230 V supply
Q… Digital outputs, AC 24…230 V, 6(4) A
Y… Digital outputs, AC 24…230 V, 3(1) A
Connection diagrams
B1
M
D1
D_GND
D1
D2
D2
HB+
HB-
HB+
HB-
L
N
Q74
Q84
Q94
Q71
1
2
3
F1
1
Y11
Y12
Y14
Y21
Y22
Y24
Y34
Y31
Y1
N1 N2
AC 230V
L
N
TX+
TX-
485
gnd
RS485
Y2
B1
F2
Y3
B1 External temperature sensor (optional) or pipe changeover sensor (application A8)
CR1 Compressor relay stage 1
CR2 Compressor relay stage 2
D1 Remote activation of Comfort mode
D2 Fault or emergency heating
F1 3-speed fan
F1 External supply line fusing, max. 10 A
F2 1-speed fan
N1 RRV851 controller
N2 QAX850 master room unit
RV Reversing valve
Y1 Cooling output
Y2 Heating output
Y3 Auxiliary heating, emergency heating or 2nd stage cooling
Y4 Valve actuator, AC 24…230 V
Typical connection

10/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Y11
Y12
Y14
Y1
Y2
Y4
Y21
Y22
Y24
AC 24
/230V
N1
Y11
Y12
Y14
Y1
Y2
Y4
Y21
Y22
Y24
AC 24
/230V
N1
2-pipe FCU, 2-position control
(application A8)
Optional 3-position control (applications
A1, A2 and A8)
Y11
Y12
Y14
Y21
Y22
Y24
N1
Y34 Y31
CR2 CR1 RV
AC 24
/230V
Heat pumps (application A5)
(For single compressor heat pumps, CR2 is
not connected)
Note: Contact your local Siemens representative for application-specific wiring
diagrams and information.
•External supply line fusing must be used.
•All input and bus terminals are not protected against connection to AC 230 V.
•Observe the technical data for fan relay outputs: Max. AC 250 V, 6(4) A.
•All output cables used must satisfy insulation requirements with regard to
mains potential.
•AC 24 V outputs must be segregated from AC 250 V outputs.
•Care should be taken when cables pass through sharp metal openings,
conduits or ducts.
•Double insulation on output cables is recommended.
•Local installation regulations must be observed.
Product liability
The products may only be used in building services plant and applications as described
above. When using the products, all requirements specified under ”Technical data”
must be observed.
Output connections
Output connections
STOP Note

11/11
Siemens Temperature Controller RRV851 CE1N2725en
Building Technologies 27.08.2007
Dimensions
Without terminal covers
With terminal covers
Dimensions in mm
©2005-2007 Siemens Switzerland Ltd
Subject to alteration