Xylem AC1683B Marlow Series Cast Iron Swimming Pool Pumps 3B28EC – 3B32EC - Manual (Page 7)

Marlow
© COPYRIGHT 1998 BY ITT INDUSTRIES, INC.
PRINTED IN U.S.A. 12-98
Marlow
445 Godwin Ave.
Midland Park, NJ 07432
(201) 447-7401
Fax: (201) 444-7545
7
SYMPTOMS PROBABLE CAUSE RECOMMENDED ACTION
1. Pump will not prime 1. Suction air leak. Make sure strainer gasket is clean and
properly positioned.
Tighten strainer cover down snugly.
Tighten all pipes and fittings on suction of
pump.
Remove and replace pump seal.
Be sure water in pool is high enough to flow
through skimmer.
2. No water in pump. Make sure pump tank is full of water.
3. Closed valves or blocked lines. Open all valves in system.
Clean skimmer and pump strainer.
Open pump and check for clogging.
2. Motor does not turn. 1. No power to motor. Check that all power switches are on.
Be sure fuse or circuit breaker is properly set.
Time properly set?
Check motor wiring at terminals.
2. Pump jammed. With power off turn shaft – it should spin
freely. If not disassemble and repair.
3. Low flow. 1. Dirty filter. Back wash filter when filter pressure is “high.”
2. Dirty skimmer basket. Clean skimmer and pump strainer basket.
3. Suction air leak. (See Problem 1)
4. Closed valves or blocked lines. (See Problem 1)
5. Reverse rotation. Can happen only with 3 phase motors,
change any two power leads.
4. Motor runs hot. These motors will run “hot” to
the touch. However, this is normal,
they are designed that way. Thermal
overload protector will function to turn
them off if there is an overload or high
temperature problem. Excessive heat
can be caused by:
1. Low voltage or incorrect voltage. Wiring to be corrected by licensed electrician.
2. Installed in direct sun. Shield motor from sun’s rays.
3. Poor ventilation. Do not tightly cover or enclose motor.
5. Noisy operation of motor. 1. Bad Bearings. Have electrician replace bearings in motor.
6. Noisy operation of pump. 1. Air leak in suction line. Bubbles in water Repair leak. Check suction pipe, strainer
returning to pool at inlet. cover in place? Cover gasket clean?
2. Restricted suction line due to blockage Remove blockage or increase suction pipe
or under-size pipe. Indicated by high size. Make sure strainer basket is clean.
vacuum reading at pump suction. Are all suction valves fully open?
3. Foreign matter (gravel, metal, etc.) in Disassemble pump and remove foreign
pump impeller? matter from impeller.
4. Cavitation. Improve suction conditions. (Reduce suction
lift, reduce number of fittings, increase pipe
size.) Increase discharge pressure and reduce
flow by throttling discharge valve.
7. Motor overload protection “Kicks Out”. 1. Motor is improperly connected. Check wiring diagram on motor.
2. Low voltage due to undersized wire or Check with volt meter. Increase size of supply
low incoming voltage. wire. Report low supply voltage to power
company. Voltage at motor must be within
10% of motor nameplate voltage.
3. Wrong size heaters in protective device. Heaters should be one size larger than full
load amps shown on motor nameplate.
4. Overload due to binding in pump or Indicated by high amperage readings on
wrong size impeller. motor, binding shaft. Disassemble unit
and correct.
TROUBLESHOOTING GUIDE
NOTE: Never work on pump without making certain power is off.
WARNING
Electrical Work Must Be Done
By A Licensed Electrician.