MODELS 2P121 THRU 2P128 & WP373 THRU 2P380
General Safety Information (Continued)
17. All wiring should be performed by a qualified electrician
18. Protect electrical cord from sharp objects, hot surfaces, oil, and chemicals Avoid kinking the cord Replace
or repair damaged or worn cords immediately
19. Keep fingers and foreign objects away from ventilation and other openings Do not insert any objects into
20. Use wire of adequate size to minimize voltage drop at the motor.
21. Disconnect power before servicing a motor or its load If the power disconnect is out-of-sight, lock it in the
open position and tag it to prevent unexpected application of power
22. Do not touch an operating motor Modern motors are designed to operate at high temperatures
WARNING: DO NOT HANDLE A PUMP OR PUMP MOTOR WITH WET HANDS OR WHEN STANDING ON A WET OR DAMP SURFACE,
OR IN WATER.
WARNING: ALL SINGLE PHASE PUMP MOTORS ARE EQUIPPED WITH AN AUTOMATIC RESETTING THERMAL PROTECTOR AND
MAY RESTART UNEXPECTEDLY. PROTECTOR TRIPPING IS AN INDICATION OF MOTOR OVERLOADING AS A RESULT OF
OPERATING THE PUMP AT LOW HEADS (LOW DISCHARGE RESTRICTION), EXCESSIVELY HIGH OR LOW VOLTAGE, INADEQUATE
WIRING, INCORRECT MOTOR CONNECTIONS, OR A DEFECTIVE MOTOR OR PUMP.
WARNING: IN ORDER TO SAFELY USE THIS PRODUCT FAMILIARIZE YOURSELF WITH THIS PUMP AND ALSO WITH THE LIQUID
(CHEMICAL, ETC. THAT IS GOING TO BE PUMPED THRU THE UNIT EVEN THOUGH THIS PUMP IS SUITABLE FOR MANY LIQUIDS,
IT IS NOT SUITABLE FOR ALL LIQUIDS!
IMPORTANT IN INSTALLATIONS WHERE PROPERTY DAMAGE MIGHT RESULT FROM AN INOPERATIVE OR LEAKING PUMP DUE
TO POWER OUTAGES, DISCHARGE LINE BLOCKAGE OR ANY OTHER REASON, A BACK-UP SYSTEM(S) AND/OR WARNING
SYSTEM(S) SHOULD BE USED
CENTRIFUGAL PUMP SELECTION GUIDE
Know the characteristics of the liquid being pumped, including its type, concentration, viscosity, pH factor,
specific gravity, temperature, etc This information is available from your chemical supplier When the pump is
used with liquids other than water, factory warranty must be extended by application Write or call nearest
Dayton Electric Mfg. Co distributor for Pump Application Form No 5S1763 Complete and return form, indicating
chemical type, concentration, specific gravity, pH, pump use, etc for warranty validation
Determine GPM required and total feet of head (suction lift + discharge head + friction losses) Suction lift is the
vertical distance pump is above liquid. Discharge head is vertical distance pump must "push" liquid (Feet of
head = 2.31 X discharge pressure in PSI). Friction losses depend on flow (GPM), pipe size, total feet of pipe,
and number of valves, elbows, tees, etc. In 1/12 " 50 GPM dives 0.7 PSI drop for every 10 feet of pipe and
100 GPM dives 2.7 PSI drop. 2" pipe at 100 GPM dives 0.8 PSI drop. For each elbow or tee in line, add
equivalent PSI drop for 10 feet of pipe. Read down from Total Feet of Head to Performance chart (Ref. No.
A, B or C) which dives desired GPM
Determine whether or not horsepower available is sufficient to power the pump. Multiply the HP required for
the pumping unit times the specific gravity of the liquid being pumped. This is the minimum electric motor
horsepower required. Proposed motor horsepower at service factor (motor HP x service factor) must exceed
pump's minimum horsepower required Select a 3450 RPM, NEMA 56C face, keyed shaft electric or air motor of
the proper horsepower rating. Explosion-proof electric and air motors may be acceptable for applications
involving flammable liquids, such as acetone (see following Warning). The completely assembled Models
2P121 to 2P124 and 2P373 to 2P376 can handle liquids with specific gravities up to approximately 1.30.
Models 2P125 and 2P377 can handle liquids with specific gravities up to 1.05. Example Select pump to
transfer trichlorethylene (1 47 specific gravity) at a rate of 50 GPM at 30 feet of total head
Reading down from 30' column, pumping unit Ref. No. B is needed; Minimum electric motor horsepower is 1.10
HP x 1.47 = 1.62 HP. Completely assembled pumps Model 2P122 or 2P374 do not have sufficient
horsepower. Therefore, order 2P127 or 2P379 pumping unit and 3N238 (2 HP, 3 PH, 3450 RPM) electric
motor-or 4Z231 1 3/4 HP) air motor with 6X889 flange.
WARNING: OPEN DRIPPROOF TOTALLY ENCLOSED FAN COOLED (TEFC), TOTALLY ENCLOSED NONVENTILATED (TENV) AND
OTHER SIMILAR MOTORS SHOULD NOT BE USED WITH FLAMMABLE OR EXPLOSIVE ATMOSPHERES. IN HAZARDOUS
LOCATIONS, WHERE ELECTRIC MOTORS ARE DESIRED, EXPLOSION-PROOF ELECTRIC OR AIR MOTORS MAY SATISFY
REQUIREMENTS. EACH APPLICATION SHOULD BE REVIEWED FOR COMPLIANCE WITH YOUR LOCAL CODES, FIRE DEPTS.,
INSURANCE COMPANIES, NEC, ETC. FOR THE PROPER CLASS AND GROUP OF THE EXPLOSION-PROOF MOTOR NEEDED.
IMPORTANT. SOME CHEMICALS AND/OR SOLUTIONS CAN SET UP, CRYSTALIZE AND/OR SOLIDIFY DEPENDING ON
TEMPERATURE, ATMOSPHERIC CONDITIONS, HUMIDITY, ETC THIS COULD CAUSE PUMP AND SEAL CLOGGING, AND EVENTUAL
Place motor on end opposite shaft, on a level surface, support If necessary. Remove suction plate (Ref.
No. 19) (See figure 3.)
Assemble two halves of shaft adapter clamp (Ref. No 2) with two socket head capscrews (Ref. No.1),
leave assembly loose and slide onto shaft adapter of pumping unit assembly (See figure 3).
Slide pumping unit assembly onto motor shaft and mounting face (See figure 3).
Install two 3/8-16 x 1" hex capscrews (Ref. No. 7) with washers (Ref No 6) into motor through two
opposite holes in adapter (Ref No 5) of pumping unit