1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
14
11/12/18
ROTATION:
Before connecting the motor to the pump, bump start the driver and verify rotation is in the proper direction. The correct
pump rotation is indicated by a directional arrow on the pump casing.
OPERATION:
GENERAL:
This section contains general rules for operation. Because variations may exist in a particular installation between the
pumps, the drivers and the accessory equipment, specific operating instructions are not within the scope of
this manual.
WARNING:
Before starting or operating the pump, read this entire manual and especially comply with the following instructions:
A. Before starting the pump, install guards around all exposed rotating parts.
B. Before starting the pump, rotate the unit or assembly by hand to assure all moving parts are free.
C. Observe all caution or danger tags attached to the equipment.
D. Never run the pump dry as the close running fits within the pump are lubricated by the liquid. Running dry may result
in pump seizure.
E. Before starting the pump, fill the casing and suction line with liquid. The pump may be primed by using a
priming system.
F. If excessive vibration or noise occurs during operation, shut the pump down and consult a Fairbanks Nijhuis™
representative.
G. Before starting a packed box pump, adjust the packing so there is sufficient leakage to lubricate the packing and
assure a cool stuffing box. (See maintenance instructions.)
OPERATING AT REDUCED CAPACITY:
In a typical application covering a wide range of flow rates, a variable speed driver is often used to adjust pump capacity,
and this is taken into consideration by Fairbanks Nijhuis when selecting the pump and impeller trim. Although these
pumps are applicable over a wide range of operating conditions, care should be exercised when doing so, especially
when the actual conditions differ from the sold-for conditions. You should always contact your nearest Fairbanks Nijhuis
distributor or factory before operating the pumps at any condition other than that for which they
were sold.
Generally, these pumps can be operated continuously at a capacity equal to 25% of the pump capacity at the best
efficiency point, and at higher capacities. At capacities less than 25% of best efficiency point capacity, we recommend
that the pumps be operated for intermittent periods of time only.
