Step 4 – Relay Wiring
In most cases, wiring of the ventilation control relays can be completed without opening the
front panel of the detector. Color-coded wires connected to the internal relay terminals extend
outside the housing through the conduit connector located at the top, left of the unit. Use only
the necessary wires required for control of the ventilation components. Cover or seal the ends
of any unused wires and place them safely inside the conduit or electrical box.
Determine the type and number of fans and or make-up air units the detector will control. For
proper installation, you must first determine how and when the fans/make-up air units will
operate. Many installations have only one or two ventilation components designed to operate
simultaneously. These components usually operate from the A1 terminals of the Low Alert
relay. Other ventilation systems contain multiple components designed to operate in two
stages. Connect the primary ventilation components to the A1 terminals of the Low Alert relay
using the yellow wires and the secondary components to the A2 terminals of the High Alert
relay using the brown wires. When using multiple zones, follow the same guidelines as above
using the red wires for A1 and blue wires for A2 of Zone 2.
Do not exceed the specified voltage and power limits of the relays (see page 6). Most
installations require motor starters or larger relays to provide the necessary power
requirements for the ventilation components.
For more information concerning ventilation system operation, read page 17 of this manual.
Step 5 – External Alarms
Determine if the installation requires an external alarm. If so, provide the proper wiring and
connect the wires to the required voltage source. Connect the wiring to the Alarm relay(s)
using the gray wires for Zone 1 and purple wires for Zone 2.
Refer to page 18 for more information concerning the alarm feature.
Step 6 – Applying Power
Once you are sure that the wiring connections are correct, apply power to the detector circuit.
When power is first applied, the unit will begin a 150 second countdown on the display while
the indicator LEDs turn on and off in a circular pattern. This is the warm-up phase. Once the
timer reaches zero, the green Power LED will remain solid and the yellow LEDs will begin to
alternate according to how many zones and sensors are present.
See page 18 for more information concerning the initial startup.
IOM01
Rev 1.0 – December 22, 2020 12
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