A
M-TRAC1
IOM-55
May 2019
18
FAN OPERATION FLOWCHART
- Main supply power ‘ON’.
- Service switch ‘ON’.
- Fire alarm contact ‘CLOSED’.
- Any additional contacts to terminal H ‘CLOSED’.
- 24Vac across terminals H and N.
Light C blinks
several times
very fast.
Fuse okay?
- Lights A and E slow blink.
Replace fuse.
No
Replace M-TRAC
Yes
No
- Enable fan switch and/or any
other interlocks to power terminal
FS (24Vac).
- Lights A and E ‘ON’.
- Flow control actuator moves to
ignition position.
- DM contact closes to enable damper
actuator.
Dampers
opening?
- Confirm output voltage at terminal DM.
- Check wiring connections to damper actuator.
- Confirm damper actuator is operational.
- Check damper assembly is free to move.
No
- Fan delays to allow dampers to open, then
starts.
Yes
Fan starts?
- Lights A and D slow blink (heat switch is still open).
- Light C will blink fast as fan speed increases, then off.
- Confirm output voltage on terminal SA.
- Check downstream wiring to motor starter.
Light C off?
End of fan section.
- Slow blink: air velocity too low.
- Fast blink: air velocity very low.
- Irregular blink: air flow or M-TRAC problem.
- Confirm air tubes are connected properly.
Yes
Yes
No
No
Yes
Check M-TRAC fuse.
