Armstrong 4600 HSC series Посібник з монтажу та експлуатації - Сторінка 12
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i n s ta l l at i o n &
o p e r at i n g i n s t r u c t i o n s
12
5.0 trouble shooting
causes
pump will not start
Faulty electrical circuit
Stuffing box too tight or packing improperly installed
Impeller locked
Excess bearing friction due to wear and dirt
pump is noisy or vibrates
Stuffing box too tight or packing improperly installed
Impeller obstructed
Excess bearing friction due to wear and dirt
Foundation not rigid
no water discharge
Air pocket or air leakage in suction line
Suction connection obstructed
Impeller obstructed
Pump not primed
discharge pressure too low
Air leakage in suction line
Suction connection obstructed
Stuffing box too tight or packing improperly installed
Water seal or pipe to seal obstructed or air leak into pump through
stuffing boxes
Impeller obstructed
Speed too low
Wrong direction of rotation
Rated motor voltage different from line voltage i.e., 220 or 440 volt
motor on 208 or 416 volt line
pump will not stop
* Faulty electrical circuit
Run period timer defective
Pressure too low
Horizontal split case
fire pumps
remedy
• Make sure both circuit breaker and disconnect switch are in the on position
• If the circuit breaker trips when the pump tries to start check horsepower and
• Ensure that the pressure switch is working properly and is responding to changes
• Loosen gland swing bolts and remove stuffing box gland halves; replace packing
• Remove obstruction
• Remove bearings and clean, lubricate, or replace as necessary
• Loosen gland swing bolts and remove stuffing box gland halves; replace packing
• Pressures fall off rapidly when an attempt is made to draw a large amount of
• Remove bearings and clean, lubricate, or replace as necessary
• Tighten foundation bolts or replace foundation if necessary
• Uncover suction pipe and locate and re-arrange
• Examine suction intake, screen, and suction pipe and remove obstruction
• Pressures fall off rapidly when an attempt is made to draw a large amount of
• First warning is a change in pitch of the sound of the driver; shut down the pump
• Uncover suction pipe and locate and re-arrange
• Examine suction intake, screen, and suction pipe and remove obstruction
• Loosen gland swing bolts and remove stuffing box gland halves; replace packing
• Loosen gland swing bolt and remove stuffing box gland halves along with the
• Clean the water passage to and in the water seal-ring. Replace water seal-ring,
• Pressures fall off rapidly when an attempt is made to draw a large amount of
• Check that rated motor speed corresponds to rated speed of pump, voltage is
• With polyphase electric motor drive two wires must be reversed; where two
• Obtain motor of correct rated voltage or larger size motor
• Is the pressure switch inside the starter properly piped up to the water system?
• Is the stop valve in the piping to the pressure switch open?
• Check that pressure switch is working properly by disconnecting one of the pres-
• Ensure that pressure switch connection lines have been flushed to clear dirt in
• Make sure that pressure switch set point is correct according to suction and
• Change manual start handle to automatic
• Remove jumper if applicable
• Verify pressure switch setting compared to system pressure
voltage specified on the schematic and wiring diagram inside the starter door
with the pump motor nameplate
in pressure
water, remove obstruction from impeller
water, remove obstruction from impeller
water-seal ring and packing.
packing gland and packing in accordance with manufacturer's instructions
water, remove obstruction from impeller
correct, and starting equipment is operating properly
sources of electrical current are available, the direction of rotation produced by
each should be checked
(system side)
sure switch leads to simulate open contact position
piping
working pressure