Digital gas monitoring
3.5 Installation Check List
Important. All wiring must conform to local building codes,
regulations and laws. If the equipment is used in a manner not
specied by the manufacturer, the protection provided by the
equipment may be impaired.
1. Use ½ inch EMT conduit for all wiring.
2. A switch or circuit breaker must be included in the installation. It
must be suitably located and easily reached in a secure location
and identied as the disconnect for the “Gas Monotoring System”.
3. Install enclosed 120/24 Vac transformer. For the size of transformer
allow 5 VA for each sensor or Communication module. Use 18 to
20 AWG two conductor wire. Do not tie the secondary to ground.
Connect multiple monitors to one transformer. Ensure that the
polarity of the AC connections is the same at each monitor or
Communication module, otherwise communication will not function.
4. Connect relay contacts (usually relay 1) to ventilation system.
Use a magnetic starter so that the sensor contacts energize the
starter coil and not the fan motor directly.
5. For multiple monitors, inter-connected using the CAN network.
Connect a shielded twisted pair cable 24 AWG from screw “L”
and “H” on one sensor, to the next monitor and continue chain
to the last sensor. Maintain the same polarity on each unit. Do
not use star, T, or H junctions, only a continuous chain. Make
all chain connections at the sensors. Connect shield to “S” on
the rst sensor or Communication module only and join shields
together at each sensor/Communication module after the rst.
6. Move the end-of-line jumper to the on position (UP) on the rst
monitor (or Communication module) on the chain and the last
monitor/Communication module on the chain. A Communication
module with no sensor module can be located anywhere on the
chain. Ensure its EOL jumper is off (down) if it is in the middle.
Monitor/Communication module addresses can be in any location
on the chain.
7. Power on the units. They will display the gas type and reading.
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