Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 61)

61
Troubleshooting
Check Main Voltage
(See Blower Start-Up Step #1)
Main Disconnect (DS1) Off
(Turn Main Disconnect DS1 On)
Primary Fuses (FU6) or Secondary Fuses (FU7/8) Blown
(Replace Fuses)
Main Transformer (TR1) Defective
(Replace Transformer TR1)
24 VAC between
terminals R and X?
24 VAC between
terminals 8 and X?
Supply Fan Overload (ST1 OL) Tripped
(Reset and check motor amps, reference blower start-up #4)
24 VAC between
terminals 7 and X?
Damper Limit Switch (DL1) Holding
(Wait for actuator to open fully or adjust limit switch)
Damper Limit Switch Jumper Missing
(Install jumper, reference the units ladder diagram for terminals)
24 VAC between
terminals 6 and X?
Optional Exhaust Fan Interlocks (ST2-ST5) Open
(Correct/Replace)
Freeze Protection (FZ1) Tripped
(Reset)
24 VAC between
terminals G and X?
Supply Switch (S2) Off
(Turn Supply Switch S2 On)
Fire system contact (FSC) tripped
(Correct/Replace)
No
No
No
No
No
Yes
Yes
Yes
Yes
Note: At this time the supply contactor (ST1) should pull in passing
power to the supply motor and the blower should start.
Yes
Blower Does Not Operate
Broken Fan Belt
(Replace - Reference maintenance section)
Defective motor or capacitor
(Repair/Replace)
Blown Motor Fuse
(Replace)
One or more legs of 3 phase is out
(Restore missing legs)
Troubleshooting