Macurco RD-xx User Manual
REV – 2.1
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3.3
Terminal Connection
3.3.1
6-Series Low Voltage
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 back side of the detector.
NOTE: 22 to 12 AWG wire shall be used. Wire used shall meet the temperature range of the detector i.e. 0°F to 125° F (-18°C to
52°C).
3.3.1.1
Mains Power Connection
Connect the RD-6 to Class 2 power supply only. It is suggested to use a separate transformer for powering the unit or units
because of possible interferences from other devices on the same power supply. Connect the RD-6 to the control cables with
terminal plugs. When making connections, make sure the power is off. There are two terminals for Power: 12 to 24 VAC or 12 to
32 VDC, with no polarity preference
Ensure that the wire cannot be easily pulled from the connector. Plug the modular connection into the Fan/Power connection
and ensure that it latches into the header properly.
3.3.1.2
Fan Relay Connection
All of the SPDT Fan relay terminals are available at the Fan/Power modular connector. Each Fan relay terminal normally open,
common and normally closed (NO, COM and NC) can accommodate a wire size 12 to 24 AWG. To install the wiring for the relays,
disconnect the connector from the header. Strip the insulation of each wire back approximately 1/4 in. (6.5 mm), insert the bare
wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be pulled from the connector. Plug the
modular connection into the Fan/Power connection and ensure that it latches into the header properly.
3.3.1.3
Alarm Relay Connection
The external alarm connections (A and B) are available at the Alarm modular connector. There is no polarity for these
connections. To install the wiring for the alarm contacts, disconnect the connector from the header on the detector. Strip the
insulation of each wire back approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp.
Ensure that the wire cannot easily be pulled from the connector. When the wires are connected seat the modular connector
into the header ensuring that the latch engages
3.3.1.4
4-20mA Signal Connection
The positive and negative 4-20mA signal connections (+ and -) are available at the 4-20mA modular connector, a 2-position
connector. To install the wiring for the 4-20 mA contacts, disconnect the connector from the header on the detector. Strip the
insulation of each wire back approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp.
Ensure that the wire cannot easily be pulled from the connector. When the wires are connected seat the modular connector
into the header ensuring that the latch engages
3.3.2
12-Series Line Voltage
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 back side of the detector.
3.3.2.1
Mains Power Connection
Mains connections should be done in accordance with National and Local Electrical Codes. Only qualified personnel should
connect Mains power to any device. 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 22 AWG.
The safety ground wire should be secured to the ground screw of the metal electrical box. Tighten the screw and make sure the
wire is snug. Ensure that the wire cannot be pulled out from under the screw.
