Installation, Operation & Maintenance Merlin CO2 TFT
Rev 1 05-21
6
0-10V ANALOGUE OUTPUT 1 & OUTPUT 2
These connections are used to regulate external fan speed controllers (supplied
separately). Connect direct to fan speed controllers or via your Merlin panel [0-
10V] terminal if available. Minimum voltage output can be configured in settings
menu from zero to 5 volts.
0-10V output can be driven by the status of current CO
2
level only, by current
temperature only or by the status of both levels (whichever is greatest).
12-24V (AC or DC) POWER
To power the CO2 TFT with 12-24v power – this should be supplied to the [12-24V
POWER INPUT] connector (+ / -).
This connection can be either AC or DC.
Configuration Settings
There is a settings switch on the CO2-TFT board. Switch it on to prompt the on-screen menu. Navigate the menu
using the buttons on the board. When changes have been made – turn the settings switch off.
[SEL.] button
Scroll through functions (highlighted red).
Change the desired setting when highlighted.
[OK] button
Highlights setting (red).
Press to save desired setting.
Configuration
NAT. -
Natural Ventilation Mode
(
Recommended for buildings without mechanical ventilation).
Pre Alarm: >1300ppm >23 °C/ 73.4°F
Alarm: >1500ppm >25 °C/ 77.0°F
CO
2
Pre-alarm relay switch: 1300ppm
CO
2
Alarm relay switch: 1500ppm
0-10V Analogue Output: Linear Progression.
Min output (1-5V) from 600ppm 23 °C/ 73.4°F
Max output (10V) from 1500ppm 27 °C/ 80.6°F
Boost from: 400
- 1499ppm 0°C/32°F – 26.9°C/ 80.4°F
MECH. -
Mechanical Ventilation Mode (Recommended for buildings with mechanical ventilation).
Pre Alarm: >800ppm >23 °C/ 73.4°F
Alarm: >1000ppm >25 °C/ 77.0°F
CO
2
Pre-alarm relay switch: 800ppm
CO
2
Alarm relay switch: 1000ppm
0-10V Analogue Output: Linear Progression.
Min output (1-5V) from 600ppm 23 °C/ 73.4°F
Max output (10V) from 1000ppm 27 °C/ 80.6°F
Boost from: 400 - 999ppm 0°C/32°F – 26.9°C/ 80.4°F
KITCH. –
Kitchen/Gas in Use Ventilation Mode (Recommended for kitchen environments).
Pre Alarm: >1500ppm >23 °C/ 73.4°F
Alarm: >2800ppm >25 °C/ 77.0°F
CO
2
Pre-alarm relay switch: 2800ppm
CO
2
Alarm relay switch: 4500ppm
0-10V Analogue Output: Linear Progression.
Min output (1-5V) from 600ppm 23 °C/ 73.4°F
Max output (10V) from 2800ppm 27 °C/ 80.6°F
Boost from: 400 - 2799ppm 0°C/32°F – 26.9°C/ 80.4°F
Buzzer / Mute from: >2800ppm
