DC-DM-ROOFTOP-IOM-1801-E - 24 -
3.1.2
Power supply
The power of the 'DC' can be 24Vac (+10…-15%) 50/60Hz or 24Vdc (22…35Vdc), maximum current of 2VA.
Lennox recommends a 24Vac supply (provided by Unit) for installation of the display less within 30 meters of Unit.
For connection of the display of over 30 meters, a power supply, close to the display, 24Vac must be provided by the
installer.
For an external connection to the Unit (24V) using a transformer class 2 under 0.1A
For any modification of wiring on the 24V supply or on 4-20mA sensor, check the polarity prior to apply the power.
Wrong polarity may cause serious damage and destroy the Plan network. Lennox will not accept liability for
damage caused by wrong power connection or any wiring modification done by people without valid training and
qualifications.
3.1.3
Communication
The 'DC' is controlled by a communication bus: RS485 2 wires.
3.1.4
Cable Features
The connection of power and communication must be made by the following cable:
- LiYCY-P (0.34 mm ²), 2 pairs with general shield.
The cable length, with power, should not exceed 30m.
The cable length without power (24V external) must not exceed 150m.
For a better electromagnetic protection, Lennox recommends the use of LiYCY-P cable
For extended networks fit a 120 Ohm resistor (R2) between RX/TX+ and RX/TX- on the last device, to avoid possible
communication problems.
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