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.
Laing Thermotech
Instruction Manual
SM-303
SM-909-14(18,26)
SM-1212/1252-21(26)
Plastic Housing SM-303 Stainless Housing SM-909/1212
Plastic Housing SM-909/1212
Seal-less Centrifugal Canned Motor Pumps
Plastic and Stainless Housing 60 Cycle
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
Description
Laing centrifugal pumps are designed for circulation and transfer of a variety of fluids compatible with
their materials of construction limited to maximum fluid temperatures and maximum line pressures as
indicated below. Unique leakproof integrated motor/pump design eliminates the need for
conventional mechanical seals or other shaft sealing devices. They are self lubricating and require no
external lubrication.
Unpacking
When unpacking the unit inspect carefully for any damage that may have occurred during transit.
Check for loose, damaged, or missing parts (see pump exploded view and replacement parts list). Do
not attempt to assemble or operate pump if any parts are missing or damaged.
General Safety Information
1. Know the pump application, limitations and potential hazards.
2. Make certain that the power source conforms to the requirements of your equipment.
3. Disconnect power before servicing. If the power disconnect is out of sight, lock in the open
position and tag it to prevent unexpected application of power. Failure to do so could result in fatal
electric shock!
4. Release all pressure within the system before servicing any component.
5. Drain liquids from the system before servicing.
6. Personal Safety
a. Wear safety glasses at all times when working with pumps.
b. Wear a face shield and proper apparel when pumping hazardous chemicals.
c. Keep work area clean, uncluttered, and properly lighted. Replace all unused tools and
equipment.
d. Keep visitors at a safe distance from the work area.
e. Make workshop childproof with padlocks, master switches and by removing starter keys.
7. The motor is designed to be used in a clean dry location with access to an adequate supply of cooling
air. Ambient temperature around the motor should not exceed 104ºF (40ºC). For outdoor installations
motor must be protected by a cover that does not block airflow to and around the motor. This unit is
not able to be submersed in water.
8. When wiring an electrically driven pump follow all electrical and safety codes, as well as the most
recent United States National Electrical Code (NEC) and the Occupational Safety and Health Act
(OSHA).
9. Single phase motors: All units are supplied with 115 volt, single phase motors (unless otherwise
noted) and provided with a 6 foot 3-wire flexible cord with 3-prong grounded plug suitable for a
standard grounded type 115 volt receptacle. Where a 2-prong wall receptacle is encountered, it must
be replaced with a properly grounded 3-prong receptacle installed in accordance with the National
Electrical Code, local codes and ordinances. To ensure a proper ground, the grounding means must be
tested by a qualified electrican.
10. Use only 3-wire extension cords that have 3-prong grounding type plugs and 3-pole receptacles
that accept the equipment plug.
11. All wiring should be performed by a qualified electrician.
12. Protect electrical cord from sharp objects, hot surfaces, oil, and chemicals. Avoid kinking the cord.
Replace or repair damaged or worn cords immediately.
Specifications 115v or 230v, 60 cycle, 1 phase (see pump nameplate)
Model No. HP Pump Inlet/Outlet Max. Max. Line Weight (lbs.)
Housing Fluid Temp. (F) Pressure
SM-303 1/150 N 1/2” or 3/4” Hose barb 140º 50 PSI 2.0
SM-303 1/150 N 1/2” Male NPT 140º 50 PSI 2.0
SM-909-14 1/50 N 3/4” Hose barb 140º 50 PSI 4.2
SM-909-14 1/50 N 3/4” Male NPT 140º 50 PSI 4.2
SM-909-14 1/50 316 SS 3/4” Female NPT 230º 150 PSI 5.5
SM-909-18 1/20 N 3/4” Hose barb 140º 50 PSI 4.2
SM-909-18 1/20 N 3/4” Male NPT 140º 50 PSI 4.2
SM-909-18 1/20 316 SS 3/4” Female NPT 230º 150 PSI 5.5
SM-909-26 1/20 N 3/4” Hose barb 140º 50 PSI 4.2
SM-909-26 1/20 N 3/4” Male NPT 140º 50 PSI 4.2
SM-909-26 1/24 316 SS 3/4” Female NPT 230º 150 PSI 5.5
SM-1212-26 1/15 N 3/4” Hose barb 140º 50 PSI 4.2
SM-1212-26 1/15 N 3/4” Male NPT 140º 50 PSI 4.2
SM-1212-26 1/15 316 SS 3/4” Female NPT 230º 150 PSI 5.5
SM-1212-21 1/15 N 1” Hose barb 140º 50 PSI 4.2
N = Polypropylene Housing
Materials of Construction (Wetted Parts)
Part Plastic Housing Models Stainless Housing Models
Pump Housing Polypropylene 316 Stainless Steel
“O” Ring EPDM or Viton EPDM or Viton
Impeller Polypropylene Noryl (Polypropylene)
Bearing Carbon Graphite/Ceramic Carbon Graphite/Ceramic
All Other Wetted Parts 316 Stainless Steel 316 Stainless Steel
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