65-2643RK-05-04 M2A Transmitter Operator’s Manual
17
Wiring the M2A Transmitter
Wiring the Detector to the M2A
WARNING:
Always verify that the power to the M2A is off before you make wiring connections.
1. Confirm that no power is being applied to the M2A.
2. Remove the detector junction box’s cover from the junction box.
3. Remove the M2A junction box’s cover from the junction box.
4. Grasp the control PCB by its edges.
5. Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too hard and
damage the cable which connects the control and terminal PCBs.
6. Let the control PCB hang by the cable. The terminal strips are now visible on the terminal PCB. The control
PCB may be left hanging while wiring is done. If desired, the control PCB may be disconnected from the
cable and set aside while wiring.
7. To maintain the explosion proof classification of the junction boxes, conduit seals must be installed as
shown in Figure 8. Adhere to your local electrical code when installing the conduit seal.
8. To maintain the M2A junction box’s NEMA 4X environmental rating and prevent water from entering the
junction box through the conduit hubs, use appropriate construction technique.
9. Guide a two-conductor, shielded cable or two wires in conduit through the top conduit hub of the detector
junction box. To make wiring more convenient, use wire colors that correspond to the detector wire colors:
green and white.
10. Connect the wires to the terminal block in the detector junction box.
11. Secure the detector junction box’s cover to the junction box.
12. Guide the other end of the two-conductor, shielded cable or two wires in conduit through the bottom conduit
hub of the M2A junction box.
WARNING:
If the top conduit hub is used for wiring, be sure to seal the threads to ensure water does not
enter the junction box. A conduit seal, which is normally required to maintain the junction
box’s hazardous location rating, will also help to prevent water from entering through the top
port.
13. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the wall between
two terminal positions with needle nose pliers and pulling. Be careful not to exert too much force on the wall
to avoid damage to the terminal strip. The detector terminal strip and the alarm 1 relay terminal strip may be
removed by grasping them with your fingers if the adjacent terminal strips have been removed.
Max Distance to M2A
w/18 Gauge Wire
Max Distance to M2A
w/16 Gauge Wire
Max Distance to M2A
w/14 Gauge Wire
500 ft.
1,000 ft.
2,000 ft.
