Installation
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11
Wiring the Combustible Gas Detector to a Controller
WARNING: Always verify that the power to the controller is off before you make wiring
connections.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. The detector leads are factory wired. Verify that the detector leads are wired to the amplifier’s
detector terminal strip as shown in Figure 11.
5. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the
terminal strip and pulling. The detector strip is keyed so that the controller and detector
terminal strips cannot be reversed inadvertently.
6. Guide a three-conductor, shielded cable, or three wires in conduit through the top conduit hub
of the junction box.
7. Pull out the controller terminal strip, and connect the three wires to the terminal strip as
follows (see Figure 11).
• Connect the positive wire to the
PWR/SIG “+”
terminal.
• Connect the signal wire to the
PWR/SIG “
S”
terminal.
• Connect the negative wire to the
PWR/SIG “-”
terminal.
CAUTION:
If shielded cable is used, leave the cable shield’s drain wire
disconnected and insulated at the transmitter. You will connect the
opposite end of the cable’s drain wire to the controller’s chassis (earth)
ground.
8. Reinstall the controller terminal strip into its socket.
9. Secure the junction box cover to the junction box.
10. Route the cable or wires leading from the combustible gas transmitter through one of the
conduit hubs at the controller housing.
CAUTION:
Do not route power and transmitter wiring through the same controller
conduit hub. The power cable may disrupt the transmission of the
transmitter signal to the
controller.
