HOMA A Series User Manual

A Series

Installation, Operation

& Maintenance Manual

Project: _______________________
Installation: ____________________

Pump Model: ______________ Serial Number: ___________

AIOM REV. 6/12

HOMA Pump Technology, Inc.

390 Birmingham Boulevard  Ansonia, CT 06401

A Series

GENERAL INSTRUCTIONS:

This manual is intended to provide basic
installation and start-up guidance. It is to be read
and thoroughly studied prior to attempting to
install or operate any of the equipment supplied.

Equipment damage, which occurs by not
following these instructions will void the warranty.

SAFETY PRECAUTIONS:

Only trained qualified personnel shall be utilized
for installation and start-up.

The following is a general list of safety
precautions that should be followed when
installing, starting-up or servicing the pump.

The pump station owner or operator is
ultimately responsible for ensuring that all
equipment is installed, started up and
operated in a safe manner.

• Do not work alone.

• Double check to make sure that all lifting

equipment is in good working order and that
it has adequate lifting capacity for the weight
that it will handle.

• Wear safety helmet, goggles and protective
shoes, or appropriate safety materials
required.

• Before working on the pump make sure that
the power is disconnected and cannot be
energized by others. Lockout and tag the
control panel circuit breaker.

• Do not stand under suspended loads!

• Never enter or work within a wet well without

first checking to make sure sufficient oxygen
is present and that there are no explosive or
poisonous gases present.

• All personnel, who work with sewage
pumping equipment and systems shall be
vaccinated against diseases that can occur. If
there are any questions or doubts in this area
it is strongly suggested that the local health
agency be contacted.

• For Hazardous Area Classifications, only use
pumps with suitable Explosion Proof Rating.

Installation, Operation & Maintenance Manual

EQUIPMENT INVENTORY AND
INSPECTION:

Upon arrival of pump shipment carefully unpack
all components and compare with shipping and
purchase order documents to ensure that the
order is complete. Also inspect equipment for
any damage that might have occurred in
shipment. If any problems are detected contact

an authorized HOMA Pump Technology
Representative immediately.

TRANSPORTATION AND STORAGE
PROCEDURE:

Always lift the pump by its lifting bail or eye bolt.

Never lift the pump by its power cable!
Damage to Sealing ring or cable may result.

Pumps should be stored in an upright position,
taking extreme care to protect the power cable
and control cables from crushing, nicks or tears
which would permit water intrusion.
Power cable ends must be protected from
immersion in water as well as moisture intrusion.
The cable will wick water into the pump if it is not
protected properly. Power cable leads should be
covered with shrink tubing or suitable sealing
material during storage.

Short Term Storage: Short term storage is
defined as any time less than six months. We
recommend that pump and accessories be
stored in its original shipping container in a dry,
temperature controlled area. If climate controlled
storage is not possible, all exposed parts should
be inspected before storage and all surfaces that
have the paint scratched, damaged or worn
should be re-coated with air dry enamel paint.
The pump should be stored in an upright
position.

Long Term Storage: Any storage time
exceeding six months is considered long term. In
addition to the safeguards specified above, the
impeller should be rotated once a month to
prevent the mechanical seals and bearings from
being damaged, and the pump should be
inspected. The seal chamber oil should be
drained and replaced prior to commissioning.
The pump should be stored in an upright
position.

Pg. 2

A Series

ELECTRICAL INSTALLATION:

GENERAL GUIDELINES

All electrical work shall be carried out under the
supervision of an authorized, licensed electrician.

The present state adopted edition of the
National Electrical Code as well as all local
codes and regulations shall be complied with.

VERIFICATION OF POWER SUPPLY

Prior to making any electrical connections or
applying power to the pump, compare the power
supply available at the pump station to the data
on the unit's nameplate. Confirm that both

voltage and phase match between pump and
control panel. The voltage supplied at the pump

shall be +5 / -10% of the nameplate value,
frequency shall be + / - 1% of the nameplate
value, the voltage phase balance shall be within
1% and the maximum corrected power factor
shall be 1.0.

POWER LEAD WIRING

HOMA A Series pumps may be provided with 1
or more cables, depending on motor horsepower
and operating voltage. Power leads L1, L2, & L3
may be provided as single conductor, or as
multiple conductors. Multiple conductor
configurations may use leads from separate
cables, or may use two conductors within one
cable. Please refer to enclosed wiring diagram
for specific connection details. The pump must

be connected electrically through a motor starter
with proper circuit breaker protection in order to
validate warranty. Do not splice cables.

THERMAL SWITCH WIRING :

Pumps are equipped with thermal switches
embedded in the stator windings which are
normally closed, automatically resetting switches.
Switches will open when the internal temperature
rises above the design temperature, and will
close when the temperature returns to normal.
Thermal switches must be wired to a current
regulated control circuit in accordance with the
NEC.
Identify thermal switch leads marked T1 and T3
in the power or control cable.
The resistance across the leads will be .5 Ohms.
Thermal leads must be connected to the thermal
overload relay located in the control panel.

Thermal switch leads must be connected to
validate warranty.

Note: All sizes of Class 1, Div. 1 pumps
for hazardous service must have thermal
switch leads connected to a current
regulated control circuit in accordance
with NEC.

SEAL PROBE WIRING

The mechanical seal leak detector probe utilized
in the pump is a conductive probe which is
normally open. The intrusion of water into the
seal chamber completes the electrical circuit.
Control panel provisions will sense this circuit
closure, and will provide indication or alarm
functions depending on the panel design.
Either single or dual wire systems may be
provided. Single wire systems utilize one
energizing conductor, and the pump casing and
neutral lead as the ground or return portion of the
circuit. The dual wire systems utilize two
separate conductors for each leg of the circuit.
With either system, the seal probe leads must be
wired into a control circuit provided in the control
panel. This control circuit must energize the
probe with a regulated power source, and sense
the closed circuit in event of water intrusion.
Indication and alarm functions must also be
provided in the control circuit. Please see control
panel wiring diagram for seal probe connection
points. IMPORTANT: For Hazardous Area

Classification Pumps, leak detector circuit must
be in conformance with applicable NEC codes
and regulations.

START / RUN CAPACITORS AND RELAYS:

All single phase motors require start and run
capacitors along with a start relay to operate.
Refer to the enclosed wiring diagram.
Capacitors and relays must be sized for the
specific motor.
Capacitors are sized based on reference voltage.
The run capacitor may need to be resized to
match the available field voltage. Each cap kit
shipped is supplied with a wiring diagram and
start up procedure.

Pg. 3

Installation, Operation & Maintenance Manual

A Series

Variable Frequency Drives:
Special considerations must be taken when
operating pumps with variable frequency
drives (inverters). The inverter circuit design,

horsepower required by pump, motor cooling
system, power cable length, operating voltage,
and anticipated turndown ratio must be fully
evaluated during the design stage of the
installation.

As a minimum, properly sized load reactors
and filters must be installed between the
inverter and the pump to protect the pump
motor from damaging voltage spikes.

Warranty coverage will not be provided on any
pump motor that is operated with a variable
frequency drive, unless the load side of the
inverter is properly isolated from the pump.

ADDITIONAL PUMP PROTECTIVE
DEVICES

Several optional pump protection devices are
available to protect submersible motors from
damage, and may be provided in your pump.

Temperature Sensing RTD*: PT100 sensors
are available in two critical locations on larger
machines, the lower bearings and motor
windings. N.C. Circuit - 108 ohm

Moisture Sensors:

seal chamber probe, additional sensors may be
installed in the stator winding, motor cap, or
junction box. These sensors may be either one of
the following:

Moisture Detectors*: These are micro
float switches designed to detect small amounts
of liquid. These are available in the stator
housing of 50hp and larger size pumps.
N.C. Circuit - 268 ohm

Leakage Detectors*: These normally
open, single or 2 wire probes are used to detect
the presence of water in the pump. Single wire

probes use the pump ground to complete
circuit.

* HOMA Go Switch or approved equivalent relay
is required for sensor operation.

In addition to the standard

Installation, Operation & Maintenance Manual

MECHANICAL INSTALLATION:

PUMPS WITH AUTOCOUPLING
SYSTEMS

The HOMA Auto-Coupling is a quick removal
system used to prevent personnel from needing
to enter the wet well.

The HOMA Auto-Coupling kit consists of a base,
guide claw flange, upper guide rail bracket,
profile seal and base anchor bolts. Refer to
“Auto-Coupling Parts ID” technical page on
website.

For all A Series pumps, attach the guide claw
flange to the pump discharge flange with the
fasteners and gaskets included with the auto­coupling kit. Use tightening torques indicated in
the table on pg. 6. Do not over tighten!
Install the profile gasket (if not already installed
at the factory) into the guide claw with the large
diameter fitted into the groove inside the claw.
Refer to the attached instructional sheet for
proper profile gasket installation.

Install suitable lifting chain of an adequate size
and length to permit proper lowering and raising
of the pump.

Properly locate the base, and with suitably sized
anchor bolts, fasten it to the floor of the pump
station. Make sure when locating and securing
the anchor bolts that the base will align properly
with the access cover at the top elevation of the
station. Place the base in position, and level the
base.

If the base is not level, proper sealing of the
pump to base may not occur!

Pg. 4

A Series

Place the guide rails (supplied by others), cut to
length into the rings of the base. The rails will be
secured at the top of the pump station with the
upper guide bar bracket and extend down to the
sump floor.
Install the upper guide bar bracket to maintain
vertical orientation of the guide rails.

For stations exceeding 10 feet in depth
intermediate guide bar brackets are
recommended. One bracket is recommended for
each additional 10 feet of station depth.

Check that the guide system is properly installed
in the vertical orientation by using levels and a
plumb line. Fully tighten all anchors and
mounting bolts.
Connect the station riser piping to the outlet
flange of the base.

Before lowering the pump, verify the direction of
impeller rotation (refer to technical details section
for procedure).

Make sure to use lifting equipment that has
adequate capacity for the pump that will be
handled. Before installing pump, check to be

certain the profile seal (rubber ring) is properly
positioned in the guide claw flange. Then
position pump so the guides on the discharge
flange engage the rails. Slowly lower the pump
along the guide rail. Once the pump reaches its
bottom location it will automatically connect to
the base.

It is recommended that the stationary base elbow
be visible before lowering the unit. If this is not
possible, ensure all debris is removed from wet
well.

Important: Do not install more than one (1) check
valve into any piping system or problems will
occur.

Minimum Submergence

For optimal cooling, motor should be completely
submerged at all times. In pump-down systems,
level should not fall below one discharge
diameter above the top of the volute. For
continuous operation with a VFD, level should
not be maintained below the top of the motor for
sustained periods. For specific inquiries, please
contact factory for assistance.

Installation, Operation & Maintenance Manual

INSTALLATION OF PUMPS WITH RING
STANDS:

The ring stand design allows for a free standing,
simple economical installation or to be
transportable from one installation to another.
It is intended to operate completely or partially
submerged in the pumping liquid.
Install the ring stand to the underside of the
volute with the supplied fasteners provided.
Apply thread locking compound such as blue
#242 and tighten the bolts using the torque table
indicated in the table. Do not over tighten!
Install suitable lifting device of an adequate
length to ensure proper lowering and raising
capabilities. Lower the pump into the area where
it is required. Properly position power cable and
chain so they stay above pump and cannot enter
the pump suction.

INSTALLATION OF PUMPS FOR DRY
PIT APPLICATIONS:

Foundation and Piping Requirements:

General
The following recommendations are basic
guidelines which are intended to outline basic
requirements in the design of the dry pit station.
It is essential that a licensed professional
engineer be retained by the owner to design the
station and all support structures.

Foundations
Foundations may consist of any structure heavy
enough to provide permanent rigid support for
the pump and inlet elbow stand. HI standards
demand at least 5 times the weight of the pump.
Concrete foundations built up from the solid
ground are the most commonly used. The
concrete floor shall be level. The space required
by the inlet stand and the location of the
foundation anchor bolts are shown on the outline
dimension drawing. Foundation bolts are to be
embedded in the concrete.

Pg. 5

A Series

Suction Piping

Suction piping should be at least as large as the
pump inlet elbow suction. If reducers are utilized
they should be of the eccentric, conical type and
must be installed with the level side up. Suction
piping should be run as straight as possible with
a recommended 10 suction diameter distance
before pump inlet. Rough sections in pipe suction
line can cause turbulence and result in severe
vibration of the pump. Pipe reducers should not
be installed adjacent to pump inlet
All pipe flange joints should be gasketed to
prevent air from entering the pipe. High points
that may collect vapor are to be avoided.
Isolation valves such as gate valves can be
installed in order to facilitate the removal of the
pump for maintenance. Any valve installed in the
suction line should be installed with the stems
horizontal.
The location of the suction piping termination
point inside of the wet pit must be installed such
that sufficient submergence is obtained to
prevent vortexing. Invert location and multiple
suction points can cause hydraulic instability to
an operating pump. Avoid high velocity or
turbulence at suction pipe inlet.

Discharge Piping

A check valve and isolation valve shall be
installed in the discharge line. The check valve
should be installed between the pump discharge
flange and the isolation valve. If pipe increasers
are used on the discharge line, they should be
placed between the check valve and the pump.
The inlet elbow stand allows the pump to be
installed in a stationary position in a dry pit. Place
the inlet stand in position and tighten the anchor
nuts.

Lower the pump onto the top flange of the

inlet stand. DO NOT ALLOW SLACK ON THE

LIFTING CABLE UNTIL THE PUMP IS
BOLTED DOWN. Make sure the flange bolt

holes align with the mounting holes on the
underside of the volute. Secure the pump to the
mounting flange with the fasteners that are
specified in the accessory fastener selection
table below.

Installation, Operation & Maintenance Manual

Bolts

PUMP MODEL Anchors

3” A SERIES

AUTOCOUPLING

4” A-SERIES

AUTOCOUPLING

3” & 4” A-SERIES

RING STAND

3” & 4” A- SERIES

DRY SUMP

6” A-SERIES

AUTOCOUPLING

6" A-SERIES

RING STAND

6" A-SERIES

DRY SUMP (1 Piece)

6" A-SERIES

DRY SUMP

(N/PMotor)

6" A-SERIES

DRY SUMP (F Motor)

8” A-SERIES

AUTOCOUPLING

8" A-SERIES

RING STAND

8" A-SERIES

DRY SUMP (2 Piece)

Notes:

1. For pumps larger than 8” please consult
factory.

2. Flange bolts must be tightened in cross
pattern to avoid damage to the raise face
flanges.

3. Standard Flange Bolts are 316SS

4. Standard Anchors are Plated Steel

5. Autocoupling systems include qty 4 M12
anchors for the upper bracket. Torque to 38
ft#.

6. Anchor bolt holes should be drilled to the
actual diameter of the anchor (M12 anchor
requires 12mm diameter hole).

8 M16X60mm 108 ft/ #
4 M16 74 ft/ #

8 M16X60mm 108 ft/ #
4 M16 74 ft/ #

4 M16x25mm 108 ft/#

8 M16x40mm 108 ft/#
4 M16 74 ft/#

8 M20x70mm 150 ft/#
4 M16 74 ft/#

4 M20x40mm 150 ft/#

8 M20x45mm 150 ft/#
4 M16 74 ft/#

8 M20x65mm 150 ft/#
4 M16 74 ft/#

8 M20x70mm 150 ft/#
4 M16 74 ft/#

8 M20x70mm 150 ft/#
4 M20 150 ft/#

4 M20x30mm 150 ft/#

8 M20x75mm 150 ft/#
4 M20 150 ft/#

SIZE TORQUE

Pg. 6