1.0 Introduction
These are surface mounted room
carbon dioxide (CO
2
) sensors which
also incorporate a temperature
sensor.
They are designed to sense the room
conditions for residential or commercial
office buildings. There are separate
0-10V output signals for CO
2
and
temperature readings and are suitable
as input signals for fans and controls
with the facility to accept a 0-10V
signal.
CO2RM –
CO
2
& temperature sensor
requires SELV power supply by others.
CO2RMPP -
CO
2
& temperature sensor
supplied with SELV ac power supply.
If the application requires direct
compatibility with Nuaire Ecosmart
control system then the control
ES-CO2RM and ES-CO2RMPP may be
more appropriate. Please refer to
separate literatures for details.
2.0 Ratings
Sensing ranges: 0-2000ppm CO
2
and
0-50
o
C.
Output: 0-10V dc proportional output,
maximum load 1mA.
Current consumption: typically 10mA
plus pulses of 0.3A for 0.3s (every 15s).
Warm up time: <5 minutes.
CO2RMPP – the mains supply to power
pack must be 230V 1~ 50Hz.
CO2RM – the SELV power supply (by
others) must have output of 24V ac
(+/-20%) or 15-35V dc.
Please note that a proprietary 24V ac
transformer would only produce 24V at
maximum load. Due to the low current
absorbed by the sensor; these would be
running at very high output voltage
(typically >30V ac) and are therefore
not suitable.
If in doubt – use the CO2RMPP to
ensure compatibility.
3.0 Installation
Installed environment: 0-50
o
C and up to
90% RH non-condensing.
The installation must be carried out by
competent personnel in accordance with
all local and national statutory re4.0
gulation; i.e. IEE, COHSE, HVCA etc.
The unit must be installed indoors, away
from direct source of heat (e.g. radiator,
direct sunlight), any water spray or
steam generating source.
The mounting surface must be free from
vibrations.
Do not install the sensor in environment
containing high level of contaminants;
e.g. dust; corrosive gases; commercial
kitchens.
Install the sensor at approximately head
height or slightly highly for best response
rate.
Use a small screwdriver to push in the
clip at the bottom of casing to open the
front cover. Remove the top half and
store it in a safe place.
Use screened cable to connect the 0-10V
output signals from the sensor to fan
or other recipient of these signals and
ensure the screening is grounded at one
end only (normally the fan end).
Use the base of unit as a template to
mark the fixing positions. Drill and insert
appropriate fasteners (e.g. Rawplug)
into the holes.
Feed the cable from the SELV side of
power pack through the large hole of
the base together with the output cable
from the sensor.
Wire the cables into the terminal block
as per wiring diagram on the reverse
side of this document.
CO2RM and CO2RMPP
CO
2
Sensor
Installation Guide
Figure 1.
Use a small screwdriver to push
in the clip at the bottom of casing to open
the front cover.
Nuaire Limited
Western Industrial Estate Caerphilly United Kingdom CF83 1NA
T: 029 2085 8400 F: 029 2085 8444 E: [email protected] W: www.nuaire.co.uk
17. 06 15. Leaflet Number 671536
Figure 2.
Use the base of unit as a
template to mark the fixing positions.
Unit Dimensions (mm)
Width 85, Height 100, Depth 26
The EMC Directive
2004/108/EC
The Low Voltage
directive
2006/95/EC
