User Manual

Building Technologies / HVAC Products CE1G2726en 23.03.2005 1/4
G2726
en
Installation and commissioning guide
Temperature controller
Duo-zone ducted systems
RRV852
Function summary
Duo-zone
• AC system is split into two zones by the on/off control of
two damper actuators. Two zones consist of the living
area (QAX850) and the night area zone, typically the
bedrooms (QAW850 or optional night zone temperature
sensor only, with all control/monitoring from QAX850).
• When both zones are selected, the average temperature
between day and night zone sensors is used to control
the main plant. When one of the zones is selected, its
corresponding temperature sensor controls the main
plant. There is “no” temperature control via the damper.
The dampers isolate the zone not required. Night zone,
Day zone or both zones open (day and night) is select-
able by the user.
Duo-switch configuration option
• AC system operates as per standard RRV851 controller
corresponding application. Only the QAX850 master
room unit is connected to the RRV852 controller. Two
on/off outputs (Q1 and Q2) from the RRV852 can be
manually activated from the QAX850. This feature can
be used for general switching of any device complying
with output technical ratings. Example: Damper actua-
tor, control valve, relay, etc.
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 protection
• 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
2
− max. 100 m where A ≥ 1.0 mm
2
• Signal cable type
− 2-wire standard installation cable (unshielded)
− 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.
• RRV852 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