Important Warning - Lennox BAC 030 SNM 3M Installation, Operating And Maintenance Manual

DISPLAY DC60

IMPORTANT WARNING:

must be done by LENNOX technician or employees having valid electrical
qualifi cation and authorization.
Power supply
The power of the DC60 can be 24Vac (+10...-15%) 50/60Hz or 24Vdc (22...35Vdc), maximum current of 2VA.
LENNOX recommends a 24Vac supply (provided by rooftop) for installation of the display less within 30 meters of rooftop.
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 rooftop (24V) using a transformer class 2 under 0,1A.
For any modifi cation 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 modifi cation done by people without
valid training and qualifi cations.
Communication
The DC60 is controlled by a communication bus: RS485.
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 fi t a 120 Ohm resistor between RX/TX+ and RX/TX- on the
fi rst and last device, to avoid possible communication problems.
BALTIC-IOM-0412-E / Control manual
Any wiring modifi cation on the CLIMATIC™ 60
• 75 •