Pentair STA-RITE 5DHG3-112 User manual

OWNER’S MANUAL
Self-Priming
Centrifugal Pumps
© 2013 Pentair, Ltd. All Rights Reserved. S983 (Rev. 02/04/13)
293 WRIGHT STREET, DELAVAN, WI 53115 WWW.STA-RITE.COM
PH: 888-782-7483
1362 1094ASBNF
5DHG3-112, 5DHH-113, 5DHH3-113
Installation/Operation/Parts
For further operating, installation,
or maintenance assistance:
Call 1-888-782-7483

Safety 2
READ AND FOLLOW
SAFETY INSTRUCTIONS!
This is the safety alert symbol. When you see this
symbol on your pump or in this manual, look for one of
the following signal words and be alert to the potential
for personal injury:
warns about hazards that will cause serious
personal injury, death or major property damage if
ignored.
warns about hazards that can cause serious
personal injury, death or major property damage if
ignored.
warns about hazards that will or can cause
minor personal injury or property damage if ignored.
The label NOTICE indicates special instructions which
are important but not related to hazards.
Carefully read and follow all safety instructions in this
manual and on pump.
Keep safety labels in good condition.
Replace missing or damaged safety labels.
Make workshops childproof; use padlocks and master
switches; remove keys.
GENERAL SAFETY
Do not touch an operating motor. Modern
motors are designed to operate at high temperatures. To
avoid burns when servicing pump, allow it to cool for 20
minutes after shut-down before handling.
Do not allow pump or any system component to freeze.
To do so will void warranty.
Pump water only with this pump.
Periodically inspect pump and system components.
Wear safety glasses at all times when working on pumps.
Keep work area clean, uncluttered and properly lighted;
store properly all unused tools and equipment.
Keep visitors at a safe distance from the work areas.
Pump body may explode if used as a
booster pump unless relief valve capable of passing full
pump flow at 75 psi is installed.
California Proposition 65 Warning
This product and related accessories contain
chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
WARNING
Hazardous pressure!
Install pressure relief
valve in discharge pipe.
Release all pressure on
system before working on
any component.
WARNING
Hazardous voltage.
Can shock, burn, or
cause death.
Ground pump before
connecting to power
supply. Disconnect power
before working on pump,
motor or tank.
Wire motor for correct
voltage. See
“Electrical” section of
this manual and motor
nameplate.
Ground motor before
connecting to power
supply.
Meet National
Electrical Code,
Canadian Electrical
Code, and local codes
for all wiring.
Follow wiring
instructions in this
manual when
connecting motor to
power lines.

Installation 3
Support suction pipe
as required Support discharge
pipe as required
As close
as possible
4 x "D"
minimum
Pipe diameter "D"
at least as large as
pump suction connection
Important:
All connections must
be
air tight
Solid, level
base
Priming
Plug
Gate
Valve
Union
Discharge
to service
Recommended pump suction
and discharge connections
Not recommended pump suction
and discharge connections
Elbow immediately
in front of pump
suction.
High
lift
Pipe diameter "D"
insufficient size
Pipe submerged
less than 4 x "D"
will cause vortexing
Long suction
run
Valve
Unsupported
Pipe
Misaligned pipe causes air leaks;
high spots along the suction line
result in
air pockets.
Offset suction flange adapter
keeps suction water level
above impeller eye to aid priming.
Use of excess fittings
means potential air leaks
Straight run, short as
possible but at least 6
times pipe diameter ("D");
slope is down going away
from pump.
1239 0894
Some models have top
discharge; these require
a priming tee.
On the discharge avoid:
Quick closing valves.
Small I.D. pipe.
Numerous fittings.
Misalignment.
Sharp turns in piping run.
Figure 1
Figure 2

Disconnect power at service panel before
connecting motor. Single phase motors come factory
wired for 220 volt operation. Do not alter wiring in
single phase motors. Match motor voltage to power
supply voltage. Do not connect three phase motors to
single phase power supply or single phase motors to
three phase power supply.
Ground motor before
connecting to electrical
power supply.
Failure to ground motor
can cause severe or
fatal electrical shock
hazard.
Do not ground to a gas
supply line.
To avoid dangerous or
fatal electrical shock,
turn OFF power to
motor before working
on electrical
connections.
Supply voltage must be within ±10% of nameplate
voltage. Incorrect voltage can cause fire or
seriously damage motor and voids warranty. If in
doubt consult a licensed electrician.
Use wire size specified in Wiring Chart. If
possible, connect pump to a separate branch
circuit with no other appliances on it.
WIRING
Step 1. Install, ground, wire and maintain this pump in
accordance with your local electrical code and all
other codes and ordinances that apply. Consult
your local building inspector for local code
information.
Step 2. Ground the pump permanently using a wire
of size and type specified by local or National
Electrical Code.
Do not ground to a gas supply line.
Step 3. Connect ground wire first. Connect to ground
first, then to green grounding terminal provided
(identified as GRD or ). Make ground
connection to this terminal. Do not connect
motor to electrical power supply until unit is
permanently grounded; otherwise serious or fatal
electrical shock hazard may be caused.
Step 4. For best ground connection, connect to a
grounded lead in the service panel or to a metal
underground water pipe or well casing at least
10 ft. long. If plastic pipe or insulated fittings are
used, run ground wire directly to the metal well
casing or use ground electrode furnished by the
power company.
Step 5. Connect power wires as shown on motor
nameplate. Be sure voltage/herz/phase listed on
nameplate agrees with your power source.
Installation 4
LOCATION OF UNIT
Locate the pump as near the liquid source as possible,
using a short, direct suction pipe. Keep the static suction
lift (vertical distance between the center line of the pump
and the liquid level) to a minimum. Mount the pump
on a solid, level foundation, which provides a rigid and
vibration-free support. It should be located where the
unit is readily accessible for service and maintenance.
The pump should be protected against flooding and
excessive moisture.
PIPING
Both suction and discharge piping should be
independently supported at a point near the pump to
avoid strains being placed on the pump. Start all piping
at pump to avoid strains left by a gap at last connection.
SUCTION PIPING
The suction pipe must be kept free of leaks. The suction
pipe must have a gradual slope upward to the pump.
Avoid any fittings which may cause an air trap. On units
that have a suction fitting, a check valve is a built-in
feature and no foot valve is required.
DISCHARGE PIPING
A gate valve and union should be installed in the
discharge line. For removal of the pump for service,
close the gate valve, and disconnect at union.
WARNING
Hazardous voltage.
Can shock, burn, or
cause death.
Ground pump before
connecting to power
supply.
Electrical

Electrical 5
Before using pump, check your motor
nameplate for voltage. Your electric supply voltage and
the stamped nameplate voltage must agree. Motors
stamped with two voltages (for example 220/380 volts),
may be used with either supply voltage. For these motors
check connections against wiring diagram on motor
nameplate and make any changes necessary to agree
with your supply voltage. If in doubt, call a licensed
electrician. Incorrect voltage will cause serious damage
to the motor.
Some models are equipped with three phase motors.
Three phase motors require magnetic starters.
To check motors for proper rotation: The shaft can be
seen through the motor - pump adapter bracket. A mark
can be made on the shaft to make it easier to notice
rotation. Jog the motor (start it briefly) and note the
rotation. It should rotate clockwise when viewed from
the motor-end. If rotation is not clockwise, see motor
nameplate for hookup information. BE SURE power is off
to the motor when working on electrical
connections.
Motor normally operates at high
temperature and will be too hot to touch. Before
handling pump or motor, stop motor and allow it to cool
for 20 minutes.
IMPORTANT: BE SURE lead wire opening on end of
motor is fully sealed when conduit or a pressure switch
is not used. Failure to seal it properly will allow dirt,
rain, bugs, etc. to enter motor through conduit opening.
Service
Never run pump dry. Running pump
without water may cause pump to overheat, damaging
seal and possibly causing burns to persons handling
pump. Fill pump with water before starting.
Never run pump against closed discharge.
To do so can boil water inside pump, causing hazardous
pressure in unit, risk of explosion and possibly scalding
persons handling pump.
PRIMING THE PUMP
A tee installed in the discharge opening of the pump,
and provided with a priming plug at the top position,
will enable you to fill the pump with liquid. Once filled
and the priming plug replaced, the pump will prime. The
pump should prime itself time after time, as long as the
built-in check valve functions.
MAINTENANCE
Little or no maintenance to pump is required other than
possible replacement of shaft seal after a reasonable
period of operation (see Page 7).
Lubricate motor according to motor manufacturer’s
in-structions. Periodic greasing is required for most
motors.
PUMP STORAGE
Drain pump to prevent freezing.
Keep motor dry and loosely covered. Do not wrap with
plastic sheeting; trapped moisture could cause corrosion
or insulation deterioration.
NOTE: A good rust inhibitor in the liquid end of cast
iron pumps is recommended to prevent excessive
corrosion.
PUMP START-UP AFTER STORAGE
Replace all drain plugs and close all drain valves in
system.
Be sure all connections are tightly sealed.
After initial check is made, fill pump according to
“Priming the Pump,” above.
SHAFT SEAL REPLACEMENT
IMPORTANT: The highly polished and lapped faces of
the seal are easily damaged. Follow instructions and
handle the seal with care.
Hazardous
voltage
Be sure unit is grounded and power
disconnected before attempting any work
on pump or motor.

Service 6
REMOVAL OF OLD SEAL
Refer to Figure 3 for Mechanical Seal parts identification.
Step 1. Disconnect all power to pump.
Step 2. Close isolation valves to cut pump off from
system.
Step 3. Drain pump; be sure to vent pump.
Step 4. Remove motor hold down bolts and bolts
holding adapter/seal plate (Key No. 6, Page
8) to pump body (Key No. 20). Slide motor,
adapter/ seal plate and impeller (Key No. 12)
backward to clear pump body.
Step 5. Remove impeller screw and washer from end of
shaft and slide impeller off of shaft.
Step 6. Unbolt adapter/seal plate from motor.
Step 7. Use two screwdrivers (Figure 4) or bearing
puller to carefully separate motor from adapter/
seal plate, bringing rotating half of seal (Key
No. 10) off with adapter/seal plate. Shaft sleeve
(Key No. 2A) may come off with seal.
Step 8. Use hammer, if necessary, to drive shaft sleeve
out of seal. Clean up shaft sleeve with emery
paper if necessary.
Step 9. Place adapter/seal plate face down on bench
and drive old stationary half of seal out of
adapter/seal plate by carefully taping with
screwdriver and hammer (Figure 5).
Step 10. Use a wire brush to thoroughly clean adapter/
seal plate cavity. Be sure all dust and grime are
out of seal cavity before installing new seal.
Stationary
Seat
Rotating
Seal
Spring
1419 1294
Figure 3
If Gear Puller is used,
place jackscrew here.
Rotating Seat will come off
with adapter/sealplate.
1420 1294
Figure 4
1421 1294
Figure 5

Service 7
INSTALLING NEW SEAL
Step 1. IMPORTANT: Seal faces are highly polished
and lapped. Handle with care. Any mar, nick
or scratch on seal face will cause it to leak. BE
SURE to install with polished faces toward each
other.
Step 2. Clean polished surface of ceramic seat with
clean cloth.
Step 3. Wet O-Ring around ceramic seat with liquid
soap.
Step 4. Press stationary (ceramic) half of seal into cavity
firmly and squarely with thumb pressure. If it
does not seal properly, remove and place face
up on bench. Re-clean adapter/seal plate cavity.
Seal should now seat correctly.
Step 5. If seal does not seat after recleaning adapter/
seal plate cavity, place a cardboard washer
over polished face of seal and carefully press
into place using a piece of 1” standard pipe as
a press. (Figure 6). NOTE: BE SURE you do not
scratch seal face.
Step 6. Dispose of cardboard washer and recheck seal
face to be sure it is free of dirt, foreign particles,
scratches and grease.
Step 7. Inspect shaft and shaft sleeve to be sure they are
clean.
Step 8. Re-install O-Ring, shaft sleeve and slinger (Key
No. 4) on shaft.
NOTE: A small amount of grease or Never-Seez
under shaft sleeve will help prevent shaft and
sleeve from freezing together when pump is in
service.
Step 9. Remount adapter/seal plate to motor, being
careful not to scratch seal face.
Step 10. Apply liquid soap to inside diameter and
outside face of rubber drive ring on rotating half
of seal.
Step 11. Slide seal assembly onto shaft sleeve (sealing
face first) far enough so that seal spring is
located on shaft sleeve. NOTE: Be careful not
to nick carbon seal face when passing it over
end of shaft sleeve.
Step 12. Slide impeller and gaskets (Key Nos. 12 and
11) onto shaft with key (Key No. 3) in position.
Be sure to maintain proper order as shown in
Exploded View, Page 8.
Step 13. Install washer, gaskets, and impeller screw (Key
Nos. 14, 15, 16, 17) on end of shaft and tighten
screw until it is snug. This should locate seal in
place and bring seal faces together.
Step 14. Re-install motor, adapter and impeller assembly
on volute, using new gasket (Key No. 7).
Step 15. Re-install motor hold-down bolts.
Step 16. Check all bolts for tightness.
Step 17. Pumps below water level: Close drains; open
isolation valves to fill pump. Pumps above
water level: Prime pump. Open isolation valves
if they were closed at disassembly.
Step 18. When pump is full, close air vents.
Step 19. Reconnect power to pump and system is ready
for operation.
1" Standard Pipe
Stationary Seat
Cardboard
Washer
(Supplied with seal)
1422 1294
Figure 6

Repair Parts 8
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
21
2
2A
1362 1094
2 HP 3 HP
Key Part No. 5DHH-112
No. Description Used 5DHG3-112 5DHH3-113
1 Motor - 60 Cycle - 220V/50Hz/1Ph 1 – M10043
1 Motor - 60 Cycle - 220V/380V/50Hz/3Ph 1 C218-185 C218-187
2 O-Ring 1 U9-265 U9-265
2A Sleeve 1 C23-58 C23-58
3 Key - Square 1 U65-42A U65-42A
4 Water Slinger - Single Phase 1 – C69-15
4 Water Slinger - 220/380V, Three Phase 1 C69-16 C69-15
5 Capscrew - 3/8 - 16 x 7/8” Lg. 8 U30-73ZP U30-73ZP
5 Capscrew - 3/8 - 16 x 1” Lg. (5DHH3-113) 8 – U30-74ZP
6 Adapter 1 C2-66 C2-66
7 Gasket - Adapter 1 C20-46 C20-46
8 Lockwasher - 3/8” 4 U43-12ZP U43-12ZP
9 Capscrew - 3/8 - 16 x 7/8” Lg. 4 U30-73ZP U30-73ZP
10 Shaft Seal 1 U9-433SS U9-433SS
11 Gasket - Seal 1 C20-101 C20-101
12 Impeller 1 C5-248 C5-249
13 Wear Ring 1 J23-5 C23-14
14 Gasket 1 C20-100 C20-100
15 Washer - Impeller 1 C43-45SS C43-45SS
16 Gasket 1 C43-46 C43-46
17 Screw - Impeller - 3/8 - 16 x 3/4” Lg. 1 U30-72SS U30-72SS
18 Volute Diffuser (w/Wear Ring, Key No. 13) 1 C101-132 C101-132
19 Diffuser Ring 1 C21-2 C21-2
20 Pump Body 1 C76-12W C76-12W
21 Pipe Plug - 1/4” NPT 2 U78-941ZPV U78-941ZPV
22 Capscrew - 5/16 - 18 x 3/4” Lg. 4 U30-60ZP U30-60ZP