Specifications

7
TypicalcoverageforCOandNO2sensorsis5,000sq.ft.(464.5sq.m),900sq.ft.(83.6sq.m)forcombustiblegas.Extrasensorsmaybeneedednearareaswherepeoplework,suchas
toll booths. 3M 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.
Exhaust fan
Exhaust fan
CM-4 CM-4 CM-4
Space transducers equally apart
and mount 5 feet above floor
Typical Layout in Parking Garage
DVP-120,
SS103 or
other control
device
Air inlet:
door, damper,
louvier
Air inlet:
door, damper,
louvier
Figure 1-1 System Wiring Diagram
2.2 General Wiring Information
W WARNING
Highvoltageterminals(120/240VAC)arelocatedwithintheDVP-120,presentingahazardtoservicetechnicians.OnlyqualiedtechniciansshouldopentheDVP-120caseandservice
the internal circuits. Ensure power is removed from the DVP-120 prior to servicing the unit.
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching connectors on
the printed circuit board (PCB). The power and signal connections to the remote mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 2-2 for recommended
wire gauges. Four conductor cables may be used in all cases since the DVP-120 employs DC power for remote sensors to help prevent electrical noise from interfering with the sensor
output signal.
Do not bundle sensor power and/or signal connections with other AC power cables to prevent electrical interference. If other AC power connections must be bundled with the DVP-120
sensor cables, the sensor connections should be made with two twisted pairs of the appropriate gauge, with an overall foil and braid shield. All shields should be terminated at the DVP-
120 end of the cable only. A ground stud is provided near the bottom left corner of the panel.
2.3 Main Power Connection
Themainpowercableshouldberoutedintothebottomleftconduitentry.3MMacurcorecommendsaminimumwiresizeofAWG18andthewireinsulatormustberatedfor140°F(60°C)
service. The modular connector will accept wire from 12 to 24 AWG. The safety ground wire should be secured to the ground stud at the bottom left of the cabinet with the lock washer and
nut supplied. Use a ring terminal for the ground connection. Refer to Table 2-1 for DVP-120 power connections. The line and neutral wires should be stripped 1/4 in. (6.5 mm), insert the
wire into the wire cavity of the modular connector and tighten the screw clamp. Ensure that the wire cannot be easily pulled from the connector. Plug the modular connector into AC~ on
the PCB and ensure that it latches into the header properly.
Signal Connector Pin Number
Line (120/220/240/250VAC) AC~ 3
Neutral AC~ 1
Ground Ground Stud n/a
Table 2-1 Main Power Connections
Figure 1-2 DVP-120 Internal View