Greenheck-fan VSU Make-Up Air Unit with Direct-Fired Gas Heater Instrukcja Użytkownika Pobierz pdf (Strona 22)

Model VSU Make-Up Air

Blower Does Not Operate

Troubleshooting

Proper supply power at

main disconnect

Check main voltage.

Reference: Start-Up - Blower, Check the Voltage, pg. 14

Main disconnect (DS1) off.

Turn main disconnect (DS1) on.

Primary fuses blown.

Replace fuses.

24 VAC between

terminals R and X?

Main transformer (TR1) defective.

Replace transformer.

24 VAC between

terminals G and X?

Supply switch (S2) off.

Turn supply switch (S2) on.

Fire system contact (FSC) tripped/not installed.

Correct, replace.

Yes

Broken fan belt.

Replace.

Reference: Maintenance - Routine, V-Belt Drives, pg. 31

Defective motor or capacitor.

Repair, replace.

Blown motor fuse.

Replace.

One or more legs of three-phase is out.

Restore missing legs.

24 VAC across A2 and A1 on

supply contactor (ST1)

24 VAC across

terminals 4 and X?

24 VAC across

terminals 3 and X?

Supply fan overload (ST1 OL) tripped.

Reset and check motor amps.

Reference: Start-Up - Blower, Motor Check, pg. 14

Optional exhaust fan interlocks (ST2-ST5) open.

Correct, replace.

(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 units ladder diagram for terminals.

Fan relay (RF) is not energized.

Check for loose connection. Repair or replace relay.

(Optional) freeze protection (RT4) tripped.

Reset.

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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Greenheck-fan VSU Make-Up Air Unit with Direct-Fired Gas Heater Instrukcja Użytkownika Strona 22

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