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Installation & Operating Manual
Please read this manual carefully before attempting to install, operate or maintain the product described. Failure to comply
with the information provided in this manual could result in personal injury and/or property damage. Retain this manual
for future reference.
Seal-less Centrifugal
Canned Motor Pumps
For Instant Hot Water Recirculating Systems
SM-303-B
UC-303-B
Laing recirculation pumps are warranted against defects in materials and workmanship for 24 months from
the date of manufacture (see mfg. date label on pump) or twelve (12) months from date of user purchase,
with proof of purchase, whichever is later. In order to receive warranty considerations, the product must be
returned prepaid to the company from which it was originally purchased. If the pump is found defective, the
pump will be replaced or in the case of wholesale customers, appropriate purchase credit will be issued.
Prior to returning any defective pump to Laing for warranty consideration, contact the Laing factory for
an RMA tracking number. Any claim for consequential damages resulting from a pump malfunction is not
covered by the Laing warranty. Additional warranty details are available on request.
SMT-303-B
with 24 hour timer
UCT-303-B
with 24
hour timer
Models: SM-303-B
SM-909-B-14
About LAING Pumps
Laing Recirc
pumps have only one moving
®
part--the rotor/impeller. The motor creates an
electromagnetic field that balances and spins the
rotor/impeller on a stationary bearing ball inside
the pump cavity. The motor is fully encapsulated in
resin, has no moving shafts or seals, and elimi-
nates conventional wear that can generate noise.
Like all seal-less centrifugal circulators, the pump
cannot be run without water lubricating the bearing.
The pump housing must be flooded before start-up
and water must be maintained in the system during
pump operation. The unique leak-proof integra-
tion of the motor and pump housing eliminates the
need for conventional mechanical seals or other
shaft sealing devices. These components are self-
lubricating and require no external lubrication.
WARRANTY
SMT-303-B
SM-909-B-14
SMT-909-B-14
UC-303-B
UCT-303-B
SMT-909-B-14
with 24 hour timer
(1/02)
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Table of Contents
Related Manuals for Laing SM-303-B
Summary of Contents for Laing SM-303-B
- Page 1 Prior to returning any defective pump to Laing for warranty consideration, contact the Laing factory for an RMA tracking number. Any claim for consequential damages resulting from a pump malfunction is not covered by the Laing warranty.
- Page 2 Evidently having hot water in the lines intermittently is acceptable (timer operated pump) but not constantly. As a result Laing cannot offer any recommendations for or against the use of plastic pipe until such time as the plastic pipe manufacturers themselves establish a clear position in this regard.
- Page 3 Do not mount the pump above the water heater. 3. Purchase materials required. • Laing Recirc® Pump (SM-303/UC-303 or SM-909) • (1) 1/2” or 3/4” swing check valve • Copper pipe or tubing (not required on UC/UCT models) •...
- Page 4 4. Shut off the water to the house. 5. Drain the plumbing lines by opening the faucets in the house. Drain the water heater if you plan to make the connection at the botom of the water heater, which requires re- moval of the drain valve.
- Page 5 Shut-Off Valve (allows isolation of water in the tank in the event of pump servicing). Hose Bib (allows venting of air from system at start-up). Auto Air Vent (allows continuous venting of air bubbles that intrude into all hot water circu- lating systems during operation).
- Page 6 Timer Controlled Operation If timer controlled operation is desired, the timer may be programmed to allow the Autocirc to operate during the hours desired (i.e. “ON” from 7:00 a.m. to 9:00 p.m. and “OFF” from 9:00 p.m. to 7:00 a.m.) as follows: •...
- Page 7 95ºF and 140ºF. The pump will turn back on automatically when the water tem- perature cools down to 10ºF below the set temperature (SM/SMT-303 only). System Maintenance SM-303-B SM-909-B-14 UC-303-B • Do not attempt to lubricate the pump.
- Page 8 • There is debris or foreign matter in the pump. • The thermostat is not functioning properly (see page 6 on thermostat operation). If wanted, the thermostat may be easily disconnected. Contact the Laing factory for details. Water Taking Too Long to Get to Faucet: •...
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Questions and answers
Where can I purchase a replacement pump for an older Laing MOD # SM-303-BSW, SER # 6082217, Part # 89720.
You can buy a replacement pump for the Laing model SM-303-B from the website maxflopump.com. The recommended replacement model is E1-BCTNN1W-06.
This answer is automatically generated