Troubleshooting

Blower Does Not Operate

Proper supply power at

No

 

 

main disconnect

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

24 VAC between

No

 

terminals R and X?

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

24 VAC between

No

 

terminals G and X?

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

24 VAC across

No

 

terminals 3 and X?

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

24 VAC across

No

 

terminals 4 and X?

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

24 VAC across A2 and A1 on

No

 

supply contactor (ST1)

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 #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 Bbelt

(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)

At this time the supply contactor (ST1) should pull in,

passing power to the supply motor and the blower should start.

26

Model MSX Make-Up Air

®

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Greenheck Fan 470658 MSX manual Troubleshooting, Blower Does Not Operate

470658 MSX specifications

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