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chapter discard.fm Page 4 Tuesday, June 7, 2011 9:29 PM
TABLE A: Minimum Pumping Rates
Pump Minimum
Type Flow Rates
HS 100 (all) 3 U.S. GPM
HS 125 (all) 4 U.S. GPM
HS 150 2020 8 U.S. GPM
HS 150 3030 10 U.S. GPM
HS 150 5050 12 U.S. GPM
HS 150 7575 13 U.S. GPM
Electrical
All electrical work should be performed by a
qualified electrician in accordance with the
latest edition of the National Electric Code and
local codes and regulations.
WARNING:
The safe operation of this
pump requires that it be grounded in accord-
ance with the National Electric Code and local
governing codes or regulations. Connect the
ground wire to the grounding screw in the ter-
minal compartment and then to the acceptable
grounding point.
Motor
Grundfos HS pumps are supplied with heavy-duty 2-pole
3450 RPM, ODP or TEFC NEMA C frame motors selected
to our rigid specifications. Motors have been selected to
operate without exceeding their service factor ratings.
Motors with other enclosure types and for other voltages
and frequencies are available on a special order basis. If you
are replacing the pumping unit, but using a motor supplied
separately, be sure to read the “Motor Replacement”
instructions on page 6 for proper adjustment of the pump
shaft.
Motor mounting position
Motors up to 3 HP can be mounted in any of four positions
in 90° steps. To rotate the motor:
1. Remove the four cap screws securing the motor to the
pump.
2. Turn the motor to the desired position.
3. Replace the motor and securely tighten the four bolts.
Note: ODP motors through 3 HP are supplied with cooling
vents. These motors should remain mounted with the
cooling vents positioned downward, especially where there
is the possibility that liquid might splash onto the pump
from above (i.e., rain).
FIGURE 3: Motor mounting positions
Supply power
Verification of the electrical supply should be made to be
certain the voltage, phase, and frequency match that of the
pump motor. The proper operating voltage and other elec-
trical information can be found on the motor nameplate.
These motors are designed to run on + or - 10% of the
nameplate rated voltage.
Wiring connection diagrams can be found on the plates
attached to the motor.
WARNING: If voltage variations are larger than + or - 10%,
DO NOT operate the pump.
Field wiring
Wire sizes should be based on the current carrying proper-
ties of a conductor as recommended by the latest edition of
the National Electric Code or local regulations.
Direct on line (D.O.L.) starting is approved due to the
extremely fast run-up time of the motor and the low
moment of inertia of the pump and motor. If D.O.L.
starting is not acceptable and reduced starting current
is required, an auto transformer, resistant starter, or soft
start should be used.
It is recommended that a fused disconnect be used for each
pump where service and standby pumps are installed.
Motor protection
SINGLE-PHASE MOTORS
Single phase Series HS pumps are equipped with multi-
voltage, squirrel cage induction motors with built-in ther-
mal protection.
THREE-PHASE MOTORS
HS pumps with three-phase motors must be used with
the proper size and type of motor starter to ensure that
the motor is protected against damage from low voltage,
phase failure, current imbalance, and overloads. A properly
sized starter with manual reset and ambient-compensated
extra quick trip in all three legs should be used.
