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Building Technologies / HVAC Products CE1G2727en 23.03.2005 1/5

G2727

Installation and commissioning guide

Temperature controller

Multi-zone ducted systems

RRV856

Function summary

• The RRV856 controller is designed for ducted HVAC

systems.

• The AC system is divided into zones (2-6 zones) by the

on/off control of the damper actuators. The default unit

for zone 1 is the QAX850 master room unit with

QAW850 zone room units used for additional zone.

• Wall units measure zone temperatures and evaluate the

demand for each zone based on the corresponding

zone setpoint. The zone damper opens on demand

from its corresponding zone room unit and closes when

there is no demand.

• Heating/cooling output and fan speed is determined

based on total demand from all zones.

Installation

Place of installation

• Mounting choices:

− Control cabinet

− Control panel

− Side of FCU

− Wall, ceiling space, cupboard

• Easy access is required for service personnel.

• The controller should not be freely accessible by build-

ing occupants.

• Do not install outside without suitable weather protec-

tion.

• Permissible ambient temperature: 0...50°C.

Electrical installation

• The local regulations for electrical installations must be

observed.

• Cable restraints must be used for the wires to terminals L,

N, Q... (AC230V).

• Cable restraints should be used for all wiring to avoid

disconnection (see diagram below).

80160

Permissible cable lengths

• For all field devices: room unit, sensors

− max. 60 m where A ≥ 0.5 mm

− max. 100 m where A ≥ 1.0 mm

• Signal cable type

− 2-wire standard installation cable (unshielded)

− Bus topology is free configuration. Ring, star etc.

− Twisted pair (unshielded) is recom-

mended for enhanced immunity to external electro-

magnetic interference, for example, in the vicinity of

radio transmitters or frequency converters.

• RRV856 controller can be mounted in any orientation.

• Ensure adequate air circulation to dissipate heat gener-

ated during operation.

DIN rail mounting

1. The housing rail is designed for snap mounting on DIN

rails, type EN50022-35 X 7.5

Surface mounting

1. Hold controller against the surface.

2. Mark fixing holes on the wall.

3. Drill holes.

4. Screw controller to the surface.

5. When mounting controller to a FCU, take care not to

damage internal components. E.g. Drilling through

coils.

Terminal covers

• The covers will provide IP30 protection when surface

mounting on wall or FCU. IP20 without terminal covers.

• The terminal covers include screws for fixing to control-

ler and knock-out holes for cable entry.

Summary of content (5 pages)

PAGE 1
G2727 en Installation and commissioning guide Temperature controller Multi-zone ducted systems Function summary • • • • The RRV856 controller is designed for ducted HVAC systems. The AC system is divided into zones (2-6 zones) by the on/off control of the damper actuators. The default unit for zone 1 is the QAX850 master room unit with QAW850 zone room units used for additional zone. Wall units measure zone temperatures and evaluate the demand for each zone based on the corresponding zone setpoint.
PAGE 2
Connection diagrams RRV856 terminals B1 M D1, D2 D_GND HB+, HB- Signal input (ext. sensor NTC) Signal ground Digital inputs Digital ground Communication bus L, N Q7..,Q84, Q94 Q1.., Q6... Y... AC 230V supply Digital outputs, AC24...230V, 6(4) A Digital outputs, AC24…230V, (0.5) A Digital outputs, AC24...
PAGE 3
STOP − The power LED on the RRV856 will be on − The QAX850 will display all LCD icons for 3 sec- Note! • All Input and bus terminals are not protected against connection to AC 230 V. onds and then the software version number for another 3 seconds. It will then revert to normal mode. Time segments on the QAX850 will be blinking if time needs to be set. − The LED on the QAX850/QAW850 will be flashing if there is a communication error between the RRV856 and QAX850/QAW850. 10.
PAGE 4
rate) in comparison to other zones. Zone weight parameter P22 can be applied to each zone as per the following. • None – Local damper control only. Zone has no effect on plant heat/cool and fan speed control. • Small – Smaller zone with low air outlet flow rate compared to other zones (i.e.: 2nd bedroom). • Medium – Medium sized zone compared to other zones (i.e.: Master bedroom). • Large – Large zone with higher air outlet flow rate compared to other zones (i.e.: Main living/dining area).
PAGE 5
QAW850 Dip switches The QAW850 includes dip switches for zone addressing. Up to 6 zones can be connected to an RRV856 controller. Dip switches on the back of QAW850. They allow setting the address in cases where several room units are connected to one RRV856 controller. The room units are delivered with default positions = zone 2 (address = 3). The master room unit QAX850 is normally zone 1 although a QAW850 can be addressed as zone 1 if required.