Merlin CO2 AVG Monitor
User Guide
Rev: 09 05-19
4
2
Features
Clear digital readings of the live CO2 levels.
LED warning lights when the CO2 levels increase.
Push button on the fascia to display the 24 hr CO2 average, which is updated every 10
minutes along with the previous 8-hr average and highest level within the last 24hrs.
100-240VAC mains powered.
Terminal outputs to control mechanical air ventilation.
Manufactured in Great Britain
3
Installation & Location
This device is designed for surface mounting using 2 mounting screws (not supplied) and MUST
be installed by a competent person. Mark the location of the two holes needed on the wall
using the back plate as a template.
Removing the back plate gives access to the circuit board (PCB).
Do not attempt to remove the Circuit Board! This will void any warranty you may hold.
Recommended Installation Locations
Unless otherwise indicated by the manufacturer, a carbon dioxide monitor, with or without an
integral detector, should be mounted between 1.4m and 1.6m above floor level. A carbon
dioxide detector head (or monitor if integrated) should not be sited within 1m of the expected
location of a bed-head.
During the first 24 hours of installation, the unit will continue to adjust its calibration to the
ambient CO2. During this time, you may notice slight variations in the PPM readings of CO2
displayed on the monitor.
4
Circuit Board
1.
POWER (LN)
A 100-240VAC electrical supply.
This should be externally fused at 3
Amps.
2.
PRE-ALARM Relay
This will switch over should the level
of CO2 rise above 1000ppm, and
automatically switch back once
the levels have dropped below
950ppm.
3.
ALARM Relay
This will switch over should the level of CO2 rise above 1300ppm, and automatically switch
back once the levels have dropped below 1250ppm.
