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2 Use Instructions and Limitations
2.1 DVP-120B General Description
The DVP-120B exhaust fan controller, use in conjunction with Macurco gas detector, controller, transducers, provides automatic
controls to help maintain an acceptable environment in parking garages or other facilities. The DVP-120B system is designed to meet
specifications for safety in enclosed parking garages, including the Uniform Building Code and OSHA 50ppm CO requirements. The
standard DVP-120B can control up to twelve analog gas sensors, as well as 87 digital addressable sensors, in any combination (i.e.
CO, NO
, EX, etc.). The DVP-120B is ready for operation after the wiring is complete and the user system configuration is entered.
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2.2 DVP-485B Modbus
Adapter
®
The DVP-485B Modbus adapter increases the capacity of the DVP-120B from 12 detectors to 99 and provides a RS-485 BACnet output.
The DVP-120B is the Modbus and BACnet enabled version of the DVP-120 with up to 87 Modbus addressable sensors on one channel,
plus the original 12 analog 4-20mA sensor channels. System wiring includes 4-20mA current loop and RS-485 serial detector interface
as well as main power connection for the DVP-120B, the fan control and alarm connections from the DVP-120B to the building ventilation
and automation systems. The RS-485 serial interface is from the DVP-120B to the remote detectors. Power to these detectors is provided
by an external 24VDC low voltage power supply. See section 3.4 Remote Sensor Connection for more information regarding remote
power supplies.
2.3 MRS-485 Modbus Adapter
The Macurco MRS-485 adapter is an accessory used to convert the 4-20mA analog signal from Macurco 6-Series type detectors to a
digital signal for use with the DVP-120B and other multipoint addressable systems. The Macurco MRS-485 simply plugs into the back of
the detector and a single screw fastens it in place. The MRS-485 accepts the 4-20mA output and is powered from the same connection
as the detector. The MRS-485 mounts to a Macurco 6-Series detector installed on a 4" x 4" electrical box electrical box supplied by the
contractor.
WARNING
Each person using this equipment must read and understand the information in these User Instructions before use. Use of this equipment
by untrained or unqualified persons or use that is not in accordance with these User Instructions, may adversely affect product
performance and result in serious injury or death.
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