User Manual

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

CE1N2726en

27.08.2007

Building Technologies

HVAC Products

726

Temperature controller for

duo-zone ducted systems

RRV852

Multifunctional controller used for central control of ducted HVAC systems in

combination with QAX850 and QAW850 room units.

Duo-zone model with two zone damper 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 RRV852 controller is designed for central ducted HVAC systems that require easy

operation by the building occupant. The MMI units that can be connected to the

controller are the QAX850 master room unit and the QAW850 zone room unit. Fan,

heating and/or cooling outputs combined with two damper actuator outputs control the

temperature within the main day and night areas of the building. The RRV852 controller

can be configured for various types of HVAC equipment. These include:

• Heating only ducted systems

• Cooling only ducted systems

• DX cooling and heating (single 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

Use

pplications

Summary of content (12 pages)

PAGE 1
2 Temperature controller for duo-zone ducted systems 726 RRV852 Multifunctional controller used for central control of ducted HVAC systems in combination with QAX850 and QAW850 room units. Duo-zone model with two zone damper outputs. Use 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 Applications CE1N2726en 27.08.
PAGE 2
• Single or 3 speed fan • Duo-zone damper control or Duo-switch function option Functions Controller functionality is determined by the Dip switch selected application, parameter settings and mode selection via the QAX850 master room unit and QAW850 zone room units. Duo-zone Air conditioning system is split into two zones by the on/off control of two damper actuators.
PAGE 3
Type summary Type reference RRV852 Note: Description Temperature controller Compatible with • QAX850 Master room unit • QAW850 Zone room unit • QAA32 Room temperature sensor • QAH11.1 Cable temperature sensor The QAX850 and QAW850 for the RRV852 must be ordered separately. Any additional remote temperature sensors must also be ordered separately. Terminal covers are included in the RRV852 packaging box. Not usable with Desigo RX range room units.
PAGE 4
• Configuration Dip switches Connection terminals Bus interface Low voltage power supply (DC 12 V) and communication transfer is supplied via two wires to the QAX850 master room unit and QAW850 zone room units from terminals HB+ and HB–. The LED on the QAX850 will flash if a communication error exists between devices for longer than 5 seconds. RS485 The RS485 connections are only suitable for downloading manufacturer specific parameter sets. This is for factory use only.
PAGE 5
• Output Y3: Auxiliary output that can be configured for auxiliary heat, emergency heat, 2nd step cool or dual compressor. Output control is two position. Three position modulating can be selected via parameter P17 for applications A1, A2 and A8 only. Damper actuator outputs The RRV852 controller can be configured for Duo-zone or Duo-switch functions. Voltfree (SPDT) relay outputs Q12, Q14 and Q22, Q24 can switch loads up to AC 250V, 2(0.5)A. Power is supplied via terminal Q11.
PAGE 6
Sensor calibration Generally there is no need to calibrate sensor; however the displayed room temperature on the QAX850 and QAW850 LCD can be calibrated if there is any discrepancy from the actual temperature measured with a certified thermometer. Calibration function can be accessed by pressing the and buttons simultaneously for 5 seconds. Displayed value can then be adjusted via the same buttons in 0.1K steps. Range is ±3 K.
PAGE 7
DIN Rail mounting The housing base is designed for snap-mounting on DIN rails, type EN50022-35 × 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. 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.
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 13 VA max. 10 A Functional data Reserve of clock max.
PAGE 9
Interfaces (S+, SG) HCC bus Bus power supply voltage Baud rate Permissible cable lengths For bus communication A ≥0.5 mm² A ≥1 mm² Type of cable proprietary protocol DC 12 V, +10, –15% (supply to room unit QAX850) 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.
PAGE 10
Connection terminals B1 M D1, D2 D_GND HB+ HB– L, N Q1…, Q2… Q7…,Q84, Q94 Y… Signal input (ext. sensor NTC) Signal ground Digital inputs Digital ground Communication bus AC 230 V supply Digital outputs, AC 24…230V, 2(0.
PAGE 11
Output connections N1 Y24 Y22 Y21 Y12 Y14 Y11 Y24 Y22 Y21 Y14 Y12 Y11 N1 AC 24 /230V Y2 Y1 Y2 Y1 AC 24 /230V Y4 Y4 2-pipe FCU, 2-position control (application A8) Optional 3-position control (applications A1, A2 and A8) CR2 CR1 RV Y22 Y24 Y21 Y14 Y12 Y11 Y34 Y31 N1 AC 24 /230V Heat pumps (appl. A5) (For single compressor heat pumps, CR2 is not connected) Contact your local Siemens representatives for application specific wiring diagrams and information.
PAGE 12
Dimensions Without terminal covers With terminal covers Dimensions in mm 12/12 Siemens Building Technologies ©2005-2007 Siemens Switzerland Ltd Subject to alteration Temperature Controller RRV852 CE1N2726en 27.08.