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Appendix C – Troubleshooting

Pump will not operate:

1)  Check incoming power

2)  Check motor overload. Reset if tripped.

3) With  contactor  pulled  in,  check  voltage  of  the 

motor  leads.    Voltage  should  be  the  same  as  the 
incoming power.  If no voltage is present, replace
the  contactor.  If  voltage  is  present,  contact  an 
electrician to check the leads & motor.

4)  Check pressure switch cut-in and cut-out setting.

5)  Check low water cut-off switch probe point in the 

reservoir. 

Pump will not build pressure

1)  Suction valve is closed. If closed, open.

2) Motor  not  operating  at  rated  RPM.  Have  motor 

checked at local motor repair shop.

3) Internal  pump  damage.  Take  pump  to  authorized 

pump repair facility.

Pump will not start automatically

1) No power. Restore if there is no power.

2) Pressure  switch  not  adjusted  properly.    Refer  to 

pressure switch setting section 3.1.1.

DANGER:  Troubleshooting  live  control  panels  ex-
poses  personnel  to  hazardous  voltages.  Electrical

troubleshooting  must  only  be  done  by  a  qualified  electri-
cian.  FAILURE  TO  FOLLOW  THESE  INSTRUCTIONS
COULD  RESULT  IN  SERIOUS  PERSONAL  INJURY,
DEATH, AND/OR PROPERTY DAMAGE.

DANGER:  High  voltage  can  kill.  Disconnect  and
lockout  power  prior  to  servicing  unit.  FAILURE  TO

FOLLOW  THESE  INSTRUCTIONS  COULD  RESULT  IN
SERIOUS PERSONAL INJURY, DEATH, AND/OR PROP-
ERTY DAMAGE.

WARNING:  Electrical  shock  hazard.  Inspect  all 
electrical  connections  prior  to  powering  the  unit.

Wiring connections must be made by a qualified electrician
in  accordance  with  all  applicable  codes,  ordinances,  and
good  practice.  FAILURE  TO  FOLLOW  THESE  INSTRUC-
TIONS  COULD  RESULT  IN  SERIOUS  PERSONAL
INJURY, DEATH, AND/OR PROPERTY DAMAGE.

Summary of Contents for Bell & Gossett GMU-30

Page 1: ...s When used the safety alert symbol means ATTENTION BECOME ALERT YOUR SAFETY IS INVOLVED FAILURE TO FOLLOW THE INSTRUCTION MAY RESULT IN A SAFETY HAZARD Glycol Make up Unit DESCRIPTION Single pump uni...

Page 2: ...ained in this manual is intended to assist operating personnel by providing information on the char acteristics of the purchased equipment It does not relieve the user of the responsibility to adhere...

Page 3: ...ptible to failure if operated in ambient temperatures outside of its rat ing The OPERATING temperature range for this unit is 32 to 105 F The relative humidity should not exceed 95 non condensing The...

Page 4: ...A dedicated ground wire must be connected to the unit Single phase motors have internal overload protec tion The disconnecting means and short circuit pro tection are to be supplied and mounted by ot...

Page 5: ...tion when operating the system This position provides positive shutoff c Adjust the valve between 20 to100 open 3 1 3 Diaphragm Expansion Tank Diaphragm expansion tank factory pre charge is 40 psi Adj...

Page 6: ...ing condi tions may require resetting the controls For best results use compressed air and a continuity meter across the switch to reset the controls The legend plate on the control indicates approxim...

Page 7: ...No power Restore if there is no power 2 Pressure switch not adjusted properly Refer to pressure switch setting section 3 1 1 DANGER Troubleshooting live control panels ex poses personnel to hazardous...

Page 8: ...CUT OFF SWITCH Y STRAINER PUMP 2 OPENING TANK 55 GALLONS TRIPLE DUTY VALVE PRESSURE SWITCH PRESSURE GAUGE SYSTEM OUTLET 3 4 NPT DIAPHRAGM EXPANSION TANK BY OTHERS PRESSURE REDUCING VALVE GATE VALVE G...

Page 9: ...9 Appendix E Wiring Diagram 1GMU01...

Page 10: ...IL 60053 Phone 847 966 3700 Fax 847 966 9052 www bellgossett com Copyright 2010 ITT Corporation Printed in U S A 4 10 THE ITT ENGINEERED BLOCKS SYMBOL AND ENGINEERED FOR LIFE ARE REGISTERED TRADEMARKS...

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