Xylem IM138 R01 HMC Close-Coupled Centrifugal Pump - Manual (Page 3)

3
IMPORTANT
A. Inspect unit for shipping damage. Report damage to car-
rier immediately.
B. Electrical supply must be a separate branch circuit with
fuses or circuit breakers, wire sizes, per national and local
electrical codes.
C. ALWAYS disconnect electrical power when handling
pump or controls. Install all-leg disconnect switch near
pump.
D. Motors must be wired for proper voltage. (CHECK
NAMEPLATE). Wire size must limit voltage drop to 10%
of nameplate voltage at motor terminals, or motor life
and pump performance will be lowered.
E. Single-Phase: Thermal protection for single-phase units is
sometimes built-in (CHECK NAMEPLATE). If no built-
in protection is provided, use a contactor with proper
overload. Fusing is permissible is properly fused.
F. Three-Phase: Provide three-leg protection with a proper
size magnetic starter.
G. Maximum liquid temperatures: HSC & 3673 plastic
fitted, 180°F (82°C) maximum. 3642-3656-3673, AI, BF,
AB, 212° F (100°C) with optional high-temperature seal.
H. Regular inspection and maintenance will increase service
life. Base schedule on operating time.
INSTALLATION
Location – Locate the pump as near the liquid source as
practical (below the level of liquid storage if automatic
operation is contemplated). Protect unit from cold weather
or water damage due to flooding. Low static lift and short,
direct suction and discharge pipes are desirable. At suction
lift higher than 15 ft. consult the pump performance curve
for NPSH
R
(Net Positive Suction Head - Required). Suction
pipe must be at least equal in size to suction connection of
pump, and slope upward to the pump to avoid air pockets.
If pipe larger than pump suction is used, an eccentric pipe
reducer must be used at the pump. Gate valve in suction is
necessary only on positive suction head installation and must
not be used to throttle the pump.
Allow adequate room for servicing and ventilation.
Foundation – Bolt unit to foundation for easy dismantling.
Foundation surface must be flat so there is no distortion and/
or strain developed when tightening bolts. The pumps are
quiet and smooth running, but rubber mounting is desirable
on foundations susceptible to sound effect.
Alignment – No filed alignment is necessary as pumps are
close-coupled.
Wiring – National Electric Code and local codes must be fol-
lowed. Motor branch circuit must be protected by a suitable
manual or magnetic starter. Proper fusing and time delay for
starting must be selected to codes. Low voltage protection is
recommended.
Single phase motors are dual voltage, 115/230 V, 60 Hz,
A.C. All pumps are tested at the factory. At installation,
correct rotation (3-phase), phase, frequency and voltage
of power supply must be checked. Power lines must be of
proper size to carry the amperage.
Single Phase 3 HP motors are dual voltage 115/230 V,
60 Hz, A.C. Single phase 5 HP motors are 230 V, 60 Hz,
A.C. All other motors are three phase dual voltage
230/460 V, 60 Hz, A.C. The high voltages are
recommended wherever available.
Three phase rotation must be checked at installation.
Close, then break contacts quickly, observing rotation of
exposed portion of rotating parts. Rotation must agree with
arrow on pump casing. Standard rotation is counter-clock-
wise viewed from suction end. Motor wiring can be changed
in the field by following wiring diagram inside terminal box
cover or on motor nameplate.
OPERATION
Fill suction pipe and casing with liquid to be pumped to
insure mechanical seal will not run dry. Four plugs are
provided in the casing. In any position one will be on top for
priming and/or venting and another at bottom for draining.
With pump primed and motor properly wired, the unit may
be started. Be sure pump is not started against a closed valve
in the discharge line.
Maximum temperature (212° F) limitation is imposed by the
mechanical seal material. Optional high temperature seals
are available.
MAINTENANCE
1. Lubrication
Pumps should require no maintenance.
Motors use double-shielded ball bearings, prelubricated
for the life of the bearings. No further lubrication is
required.
2. Replacing Mechanical Seal
A) Dismantling:
1. Turn off power.
2. Drain system.
3. Remove bolts holding motor adapter to
foundation.
4. Remove casing bolts.
5. Remove motor and rotating element from
casing, leaving casing and piping undisturbed.
6. Insert a screwdriver in impeller waterway
passage. Remove impeller nut with a socket
wrench ( 5 ⁄
8
” across flats).
7. Remove impeller from shaft as follows:
IMPORTANT
INSTALLATION
OPERATION
MAINTENANCE