Installation Manual

6
This system should be used with Macurco™ transducers and each unit will measure the level of the target gas (i.e. CO, NO2, EX) and
provide this information to the DVP-120 over a 4-20mA current loop. The transducers operate on low voltage (24VDC). All power and
signal connections for the transducers are provided from the DVP-120 control panel, via unshielded four conductor cable. Be sure that
the 4-20mA output on each sensor is set to “On”. The DVP-120 control panel provides three relays which can be used for ventilation
fan control or alarm signaling. These relays (SPDT - Form C) are for pilot duty only, capable of switching 10 amp loads up to 240 VAC.
Main power wiring should conform to national and local electrical codes, and may require separate inspections and certification.
Contact your local building authority for further details.
! WARNING
DVP-120 may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may
adversely affect product performance and result in sickness or death.
2.1 Mounting the DVP-120
Mounting holes are provided in the DVP-120 case at the four corners. The top two are keyhole shaped so that the panel can be hung
and then the two bottom screws driven to hold the panel. See figure 2-1. The panel should be mounted with sufficient space all around
for access to Conduit entry holes provided on the top, bottom and right side of the panel.
Figure 2-1 Mounting holes
Typical coverage for CO and NO2 sensors is 5,000 sq. ft. (464.5 sq. m), 900 sq. ft. (83.6 sq. m) for combustibles and other toxic
gases (see the User Instructions of each sensor type for location and coverage details). Extra sensors may be needed near
areas where people work, such as toll booths. Macurco provides only the control panels and sensors. Fans, relays, and other
devices are provided by the contractor. See the appropriate building code for the size of fans and air changes per unit of time.
Figure 2-2 Typical Layout