User Manual

ManualsBrandsSiemens ManualsAir conditioning controllerTemperature controller - Multi-zone ducted systems RRV856

CE1N2727en

27.08.2007

Building Technologies

HVAC Products

727

Temperature controller for

multi-zone ducted systems

RRV856

Multifunctional controller used for central control of ducted HVAC systems in

combination with QAX850 and QAW850 room units.

Multi-zone model with up to six zone outputs.

Use

Comfort control of ducted HVAC systems via fan, heating, cooling and damper actuator

output regulation:

• Residential apartments

• Residential single house

• Autonomous light commercial applications

The RRV856 controller is designed for central ducted HVAC systems that require easy

operation by the building occupant. The MMI required to be connected to the controller is

the QAX850 master room unit. Fan, heating and/or cooling outputs combined with a

maximum of six damper outputs, control the temperature within each zone of the building.

The RRV856 controller can be configured for various types of HVAC equipment. These

include:

• Heating only ducted systems

• Cooling only ducted systems

• DX cooling and heating

• Air to air heat pumps

• Water to air heat pumps

• 4 pipe FCU

Use

pplications

Summary of content (13 pages)

PAGE 1
2 Temperature controller for multi-zone ducted systems 727 RRV856 Multifunctional controller used for central control of ducted HVAC systems in combination with QAX850 and QAW850 room units. Multi-zone model with up to six zone outputs.
PAGE 2
• 2 pipe FCU • Single or 3 speed fan Functions Controller functionality is determined by the Dip switch selected application, parameter settings and mode selection via the QAX850 room unit. Multi-zone Individual zone air conditioning control is realized by dividing the duct system into zones (2…6 zones) by the on/off control of the damper actuators. The default room unit for zone 1 is the QAX850, with QAW850 room units used for additional zones.
PAGE 3
Application example: 4-pipe FCU system: B1 HB Q9 Q8 Q7 Y1 Y3 Y2 Q2 Q1 Q3 Q4 Q5 D2 Q6 D1 N1 Y2 Y1 FCU D1 T T N1 H1 C1 T N2 Q1 T Q2 Q3 T N3 Q4 N4 Q5 T N5 Q6 T N6 B1 W6 N1 N2 N3 FCU B1 SAF H1 C1 D1 D2 Y1 Y2 Q1…Q6 W2…W6 2727A01 SAF D2 RRV856 controller QAX850 master room unit QAW850 zone room units Fan coil unit Optional remote temp.
PAGE 4
Mechanical design The RRV856 is a temperature controller providing connection of power supply, inputs/outputs, QAW850 zone room unit and QAX850 master room unit.
PAGE 5
• Remote room temperature sensing: The QAX850 can be used as a master control unit without using the internal temperature sensor. A separate room sensor (QAA32) can be mounted in a location more convenient for accurate zone 1 temperature measuring. • 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.
PAGE 6
Function Selections 1 A7 – 4 pipe FCU A8 – 2 pipe FCU Default (as delivered) positions are in bold text. 2 - 3 - 4 off on 5 on on 6 on on 7 off off Response on start-up 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 normal display. The time segments will be blinking if time needs to be set. Set time as per operation instructions.
PAGE 7
No. Parameter Range Small Medium Large P23 Ventilation in dead zone Off, H/C, C only Mounting and installation notes The RRV856 controller can be mounted in any orientation using the following fixing options: DIN Rail mounting The housing base is designed for snapmounting on DIN rails, type EN5002235 × 7.5 (can be released with a screwdriver). Surface mounting There are two drill holes for screw-mounting (see “Dimensions”). Screws: Max. diameter 3.5 mm, min.
PAGE 8
Technical data Rated voltage Requirement for transformers for switch mode power supplies Frequency Power consumption (excl. external modules) Supply line fusing 50 / 60 Hz 15 VA max. 10 A Functional data Reserve of clock max.
PAGE 9
Baud rate Permissible cable lengths For bus communication A ≥0.5 mm² A ≥1 mm² Type of cable 9.6 kbit/s max. 60 m max. 100 m 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.
PAGE 10
Connection terminals B1 M D1, D2 D_GND HB+, HB– L, N Q7…, Q84, Q94 Q1…Q6… Y… Signal input (ext. sensor NTC) Signal ground Digital inputs Digital ground Communication bus AC 230V supply Digital outputs, AC24…230V, 6(4) A Digital outputs, AC24…230V, (0.
PAGE 11
2-pipe FCU, 2-position control (application A8) Optional 3-position control (applications A1, A2 and A8) CR2 Y24 RV Y22 Y21 Y14 CR1 Y12 Y11 Y31 Y34 N1 AC 24 /230V Heat pumps (application A5) (For single compressor heat pumps, CR2 is not connected) Note STOP Contact your local Siemens representatives for application specific wiring diagrams and information. Notes • All Input and bus terminals are not protected against connection to AC 230 V.
PAGE 12
Dimensions Without terminal covers With terminal covers 12/13 Siemens Building Technologies Temperature Controller RRV856 CE1N2727en 27.08.
PAGE 13
Dimensions in mm ©2005 Siemens Switzerland Ltd Subject to alteration Siemens Building Technologies Temperature Controller RRV856 13/13 CE1N2727en 27.08.