Greenheck Fan Part #470655 Troubleshooting, Blower Does Not Operate, See Blower Start-Up– Step #1

Troubleshooting

Blower Does Not Operate

Proper supply power at

main disconnect

Yes

24 VAC between

terminals R and X?

Yes

24 VAC between

terminals G and X?

Yes

24 VAC across

terminals 3 and X?

Yes

24 VAC across

terminals 4 and X?

Yes

24 VAC across A2 and A1 on

supply contactor (ST1)

Yes

No

No

No

No

No

No

Check Main Voltage

(See Blower Start-Up – Step #1)

Main Disconnect (DS1) Off

(Turn Main Disconnect DS1 On)

Primary Fuses Blown

(Replace Fuses)

Main Transformer (TR1) Defective

(Replace Transformer)

Supply Switch (S2) Off

(Turn Supply Switch (S2) On)

Fire system contact (FSC) tripped/not installed

(Correct/Replace)

Supply Fan Overload (ST1 OL) Tripped

(Reset and check motor amps, reference Blower Start-Up – Step #4)

Optional Exhaust Fan Interlocks (ST2-ST5) Open

(Correct/Replace)

(Optional) Freeze Protection (RT4) Tripped

(Reset)

(Optional) Damper Limit Switch (DL1) Holding (Wait for actuator to open fully or adjust limit switch)

(Optional) Damper Limit Switch Jumper Missing

(Install jumper, reference the unit’s ladder diagram for terminals)

Fan Relay (RF) is not energized

(Check for loose connection; repair or replace relay)

Broken Fan Belt

(Replace - reference V-Belt Drives in the Maintenance section)

Defective motor or capacitor

(Repair/Replace)

Blown Motor Fuse

(Replace)

One or more legs of 3 phase is out

(Restore missing legs)

At this time the supply contactor (ST1) should pull in, passing power to the supply motor and the blower should start.

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DGX Industrial Space Heating 17