STA-RITE D Series User manual

“D” SERIES
CENTRIFUGAL PUMPS WITH TRAP
FOR SWIMMING POOL USE
O W N E R’ S M A N U A L
INSTALLATION, OPERATION & PARTS
Sta-Rite Pool/Spa Group
293 Wright Street, Delavan, WI 53115
International: 262-728-5551, FAX: [phone]
www.starite.com
Union City, TN • Delavan, WI • Mississauga, Ont. • Murrieta, CA
© 2005, Sta-Rite Industries S409 (Rev. 9/6/05)
This manual should be furnished to
the end user of this pump; its use will
reduce service calls and chance of
injury and will lengthen pump life.
MODELS
Medium Head High Head Medium Head High Head
H.P. Phase Models Models Models Models
3 1 DMH-171 DHH-169 DM2H-110 DH2H-112
3 3 DMH3-171 DHH3-169 DM2H3-110 DH2H3-112
5 1 DMJ-111 DHJ-113 DM2J-111 DH2J-113
5 3 DMJ3-111 DHJ3-113 DM2J3-111 DH2J3-113

2
‘ D’ SERIES SELF-PRIMING
CENTRIFUGAL PUMP and
STRAINER
To avoid unneeded service calls, prevent possible injuries, and get the most
out of your pump, READ THIS MANUAL CAREFULLY!
The Sta-Rite ‘D’ Series Self-priming Centrifugal pump:
• Is designed for use with commercial swimming pools and spas.
• Is an excellent performer; durable, reliable.
Table of Contents
Safety Instructions ......................................................................................3
Uncrating and Inspection ............................................................................4
Installation...............................................................................................4-6
Electrical..................................................................................................7-8
Operation ...................................................................................................9
Service ...............................................................................................10-12
Troubleshooting Guide..............................................................................13
Repair Parts List ...................................................................................14-15
Warranty...................................................................................................16

3
READ AND FOLLOW SAFETY
INSTRUCTIONS!
This is the safety alert symbol. When you see this symbol on your system
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 death, serious personal
injury, or major property damage if ignored.
warns about hazards that can cause death, serious personal
injury, or major property damage if ignored.
warns about hazards that will or can cause minor personal injury
or property damage if ignored.
NOTICE indicates special instructions not related to hazards.
Carefully read and follow all safety instructions in this manual and on equip-
ment. Keep safety labels in good condition; replace if missing or damaged.
Incorrectly installed or tested equipment may fail, causing
severe injury or property damage.
Read and follow instructions in owner's manual when installing
and operating equipment. Have a trained pool professional
perform all pressure tests.
1. Do not connect system to a high pressure or city water system.
2. Use equipment only in a pool or spa installation.
3. Install pump with at least 2 hydraulically balanced main drains equipped
with correctly installed, screw-fastened, anti-entrapment certified covers.
See Page 4.
4. Trapped air in system can cause explosion. BE SURE all air is out of system
before operating or testing equipment.
Before pressure testing, make the following safety checks:
• Check all clamps, bolts, lids, and system accessories before testing.
• Release all air in system before testing.
• Tighten Sta-Rite trap lids to 25 ft. lbs. (3.5 kg-m) torque for testing.
•Water pressure for test must be less than 25 PSI (7.5 kg/cm2).
• Water Temperature for test must be less than 100oF. (38oC).
• Limit test to 24 hours. After test, visually check system to be sure it is ready
for operation. Remove trap lid and retighten hand tight only.
NOTICE: These parameters apply to Sta-Rite equipment only.
For non-Sta-Rite equipment, consult manufacturer.
IMPORTANT
SAFETY
INSTRUCTIONS
Always follow basic safety pre-
cautions with this equipment, in-
cluding the following.
To reduce the risk of
injury, do not permit children to
use this product unless they are
closely supervised at all times.
This pump is for use
with permanently installed pools
and may also be used with hot
tubs and spas if so marked. Do
not use with storable pools. A
permanently installed pool is con-
structed in or on the ground or in
a building such that it cannot be
readily disassembled for storage.
A storable pool is constructed so
that it may be readily disassem-
bled for storage and reassembled
to its original integrity.
SAVE THESE
INSTRUCTIONS

4
UNCRATING AND INSPECTION
Handle with care.
Check items received against packing list to be sure that all equipment has
been received.
Inspect for shipping damage. If found, file claim with carrier immediately.
Cleanup
Clean up foundation and surrounding area. Remove all trash and other materi-
als which will interfere with installation.
For easy assembly, make sure all threaded joints and mating surfaces are
clean. If necessary, clean with wire brush and solvent.
To reduce danger of explosion and fire, do not use gasoline as a
cleaning solvent.
Remove all foreign material (packing, etc.) from pump and strainer.
Fire and burn hazard. Modern motors run at high temperatures.
To reduce the risk of fire, do not allow leaves, debris, or foreign matter to col-
lect around the pump motor. To avoid burns when handling the motor, let it
cool for 20 minutes before trying to work on it.
INSTALLATION
Only qualified, licensed personnel should install pump and wiring.
Pump is designed for use in fresh water only.
Foundation
Foundation must:
Be located away from corrosive or flammable liquids.
Have enough ventilation to maintain air temperature at less than the maxi-
mum ambient temperature rating (Max. Amb.) listed on the motor model
plate. If this pump is installed in an enclosure/pump house, the enclosure
must have adequate ventilation and air circulation to keep the temperature in
the enclosure at or below the motor’s rated ambient temperature whenever
the pump is running.
Be Solid - Level - Rigid - Vibration free.
Be provided with necessary hold-down bolts, washers, and shims.
Allow pump inlet to be as close to water level as possible.
Use short, direct suction pipe (to reduce friction losses).
Maximum suction lift is 10’ (3 m).
Allow for isolation valves in suction and discharge piping.
Have adequate floor drainage to prevent flooding.
Be protected from excess moisture.
Allow adequate access for servicing pump and piping.
POOL PUMP SUCTION
REQUIREMENTS
Pump suction is hazardous and can trap and drown or disem-
bowel bathers. Do not use or allow anyone else to use a pool, spa, or hot tub
unless it has at least two suction outlets to each pump suction line (see
“Outlets Per Pump,” Page 5). Do not use or operate swimming pools, spas,
or hot tubs if a suction outlet cover is missing, broken, or loose. Follow the
guidelines below for a pump installation which minimizes risk to users of
pools, spas, and hot tubs.

5
Entrapment Protection
The pump suction system must provide protection against the hazard of
suction entrapment or hair entrapment/entanglement.
Suction Outlet Covers
All suction outlet covers must be maintained. They must be replaced if
cracked, broken, or missing.
See Page 5 for outlet cover certification requirements.
All suction outlets must have correctly installed, screw-fastened covers in
place.
Outlets Per Pump
Provide at least two hydraulically balanced main drains, with covers (see
Page 4), for each swimming pool pump suction line. The centers of the main
drains (suction outlets) must be at least three feet apart.
The system must be built so that it cannot operate with the pump drawing
water from only one main drain (that is, there must be at least two main drains
connected to the pump whenever it is running). (See Figure 1). However, if
two main drains run into a single suction line, the single suction line may be
equipped with a valve which will shutoff both main drains from the pump
(see Figure 1).
More than one pump can be connected to a single suction line as long as the
requirements above are met.
Water Velocity
If 100% of the pump’s flow comes from the main drain system, the maximum
water velocity in the pump suction hydraulic system must be seven feet per
second or less even if one main drain (suction fitting) is completely blocked.
The flow through the remaining main drain(s) must comply with the latest
ASME/ANSI Specification for Suction Fittings For Use in Swimming Pools,
Spas, Hot Tubs, and Whirlpool Bathtub Applications.
At Least
3 Feet
Main Drain Main Drain
Anti-entrapment
Cover, screw-fastened
to Main Drain Sump
Anti-entrapment
Cover, screw-fastened
to Main Drain Sump
Pump
Valves OK between
pump and Tee
No valves between
Tee and Main Drains
2515 0497
Figure 1 – Recommended pump suction layout.

6
Piping – General
System piping must be at least equal to size of pump connections.
To prevent strain on the pump casing and foundation, pipe and fittings must
be aligned to pump without forcing.
To avoid strains on the pump, support both suction and discharge pipes
independently. Place these supports near the pump.
To avoid a strain left by a gap at the last connection, start all piping at the
pump and run pipe away from the pump.
Piping – Suction
Risk of severe injury or drowning from hair or body
entrapment. To reduce risk of entrapment against pump suc-
tion opening, connect pump to multiple drains and skimmers
of non-entrapment design. See “Pool Pump Suction
Requirements,” Pages 4 and 5.
NOTICE: If pump suction becomes clogged, pump will cavitate, damaging
pump internal parts. Keep suction pipe clear of debris, dirt, etc.
NOTICE: To prevent flooding when removing pump for service, all flooded
suction systems must have valves in suction and discharge pipes.
Never use a suction pipe smaller than the pump suction connection.
Use larger pipe as required to keep water velocity below 7 feet per second or
local construction code limits, whichever is lower.
Suction pipe must rise continuously from source to pump. To avoid airlock-
ing, do not allow high spots in pipe.
When using reducer to connect to pump flange, use an eccentric reducer with
the straight side on top.
Piping – Discharge
Maximum water velocity should be 10 feet per second. To minimize friction
losses, make piping one size larger than pump openings.
Fittings restrict flow; for best performance use fewest possible fittings.
Avoid fittings which could cause an air trap.
Pool fittings must conform to International Association of Plumbing and
Mechanical Officials (IAPMO) standards.
Strainer
Maximum hydrostatic test pressure is 25 PSI (172 kPa) water
pressure. To avoid explosion hazard, DO NOT test strainer
with air pressure. Air pressure in strainer can blow cover off of
strainer body, which can cause severe or fatal injury. Open fil-
ter air release valve and release ALL air (wait for a steady stream of water from
vent) before hydrostatically testing strainer.
To avoid breaking pump or putting unnecessary strains on pump or strainer
body, support pipe independently of pump/strainer.
Center the strainer cover when installing it (especially when pressure testing).
When installing cover, clean O-Ring groove in strainer body, and lubricate
with petroleum jelly as follows:
A. O-Ring;
B. Sealing surfaces of strainer cover and body;
C. Threads and faces of wing nuts.
This will prevent corrosion, improve seal, and ease maintenance.
If strainer is installed backwards, debris will collect in suction pipe instead of
in strainer basket. Install strainer with cast-on flow arrows pointing in direc-
tion of water flow.
Hazardous
suction.
Hazardous suction.
Can trap hair or
body parts, causing
severe injury
or death.
Do not block
suction.

7
ELECTRICAL
Disconnect power at service panel before connecting motor.
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.
Single phase motors come factory wired for 230 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.
All electrical wiring, grounding, and bonding must be done by a licensed
electrical contractor who is familiar with commercial swimming pool installa-
tions and electrical codes and requirements. Wire sizing, wire type, branch
circuit fuse protection, motor starter, control equipment, and related items
must meet National Electrical Code and local code requirements.
Wiring
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.
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.
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.
4. For best ground connection, connect ground wire to a grounded lead in the
service panel.
5. Motors do not have internal overload protection; provide external overload
protection in the power supply circuit.
Bond motor to pool structure according to local or National Electrical Code.
Use a solid copper conductor, size No. 8 (6.0 mm2) AWG or larger.
Hazardous voltage.
Can shock, burn,
or cause death.
Ground pump before
connecting to
power supply.

8
NOTICE: Before using pump, check your motor nameplate for voltage. Your
electric supply voltage and the stamped nameplate voltage must agree.
Motors stamped 200 volts only or 230 volts only, must be used with that volt-
age only. Motors stamped with two voltages (for example 230/460 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 re-
quire magnetic starters.
To check motors for proper rotation: Remove the motor end cover. This ex-
poses the motor shaft. If hook-up is correct, the shaft will rotate clockwise.
Three Phase: If rotation is not clockwise, reverse any two leads to the starter.
The rotation will now be correct.
Single Phase: See wiring diagram on motor nameplate. BE SURE power is off
to the motor when working on electrical connections.
Burn Hazard. 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.
OPERATION
Hazardous suction. Can trap hair or body parts, causing severe
injury or death by drowning. Do not block pump or strainer
suction with body. Small children using pool must ALWAYS
have close adult supervision!
Do not run pump against closed discharge valve. To do so can
boil water in pump body, and can cause severe burns to people working on
pump.
Fire and burn hazard. Modern motors run at high temperatures.
To reduce the risk of fire, do not allow leaves, debris, or foreign matter to col-
lect around the pump motor. To avoid burns when handling the motor, let it
cool for 20 minutes before trying to work on it. An automatic internal cutoff
TABLE I – ELECTRICAL DATA - FUSING AND WIRING REQUIREMENTS
Serv. to Motor - Dist. in Ft. (M)
Motor Voltage/ Max Load Branch Fuse 0-100' 101-200' 201-300'
Model HP Hz/Phase Amps Rating Amps* (0-30M) (30-60M) (60-90M)
DMH-171, DHH-169 3 230/60/1 13.4 20 12(3) 12(3) 10(5.5)
DM2H-110, DH2H-112 3 200/60/1 17.2 25 10(5.5) 10(5.5) 10(5.5)
DM2H3-110, DH2H3-112 3 200/60/3 8.4 15 14(2) 14(2) 14(2)
DMH3-171, DHH3-169 3 230/460/60/3 8.6/4.3 15/15 14(2)/14(2) 14(2)/14(2) 14(2)/14(2)
DMJ-111, DHJ-113 5 230/60/1 22.0 30 10(5.5) 10(5.5) 8(8.4)
DM2J-111, DH2J-113 5 200/60/1 26.4 40 8(8.4) 8(8.4) 8(8.4)
DM2J3-114, DH2J3-113 5 200/60/3 13.8 20 12(3) 12(3) 12(3)
DMJ3-111, DHJ3-113 5 230/460/60/3 13.2/6.6 20/15 12(3)/14(2) 12(3)/14(2) 12(3)/14(2)
Hazardous
suction.

9
switch protects the motor from heat damage during operation.
NEVER run pump dry. Running pump dry may damage seals,
causing leakage and flooding. Fill pump with water before starting motor.
Before removing strainer cover:
1. STOP PUMP before proceeding.
2. CLOSE GATE VALVES in suction and discharge pipes.
3. RELEASE ALL PRESSURE from pump and piping system.
After pressure test, release all pressure before removing strainer cover!
NOTICE: Provide adequate ventilation. Ambient air temperature should be
104°F (40°C) or less but above freezing at all times.
NOTICE: To prevent corrosion damage, store pool chemicals in another room
away from pump.
Priming Pump
Hazardous Pressure! Before removing strainer cover, open filter
air release valve and release all pressure from system.
Open suction/discharge. In a flooded suction system, pump will prime. If
pump is not in a flooded suction system, remove strainer cover; fill strainer
and pump with water.
If necessary, use a wrench on flats when removing lock handles (Key No. 1,
Page 15).
When installing cover, clean O-Ring sealing surface on strainer body, and
lubricate with petroleum jelly as follows:
A. O-Ring and Sealing surfaces of strainer cover and body;
B. Threads and faces of lock handles.
This will prevent corrosion, improve seal, and ease maintenance.
Center strainer cover when installing it (especially when pressure testing).
Hand tighten lock handles. When tightening, alternate back and forth be-
tween handles to compress O-Ring evenly.
Maximum lock handle torque is 25 ft.-lbs. (3.5 kg.-m).
Start pump; it should prime now. Priming time will depend on vertical length
of suction lift (10'/3m maximum) and horizontal length of suction pipe.
If pump does not prime, make sure that all valves are open, suction pipe end
is under water and that there are no leaks in suction pipe. See
Troubleshooting Guide, Page 13.
NOTICE: To avoid corrosion damage to pump and strainer, do not add chemi-
cals to system anywhere on suction side of pump (including into skimmers).
Do not pour chemicals into strainer. Follow chemical manufacturer’s instruc-
tions when mixing or adding chemicals to system.

10
‘D’ SERIES COMMERCIAL POOL
PUMP DISASSEMBLY/
ASSEMBLY
See Exploded View, Page 14.
Shaft Seal Replacement
NOTICE: The highly polished and lapped faces of the seal are easily dam-
aged. Follow instructions and handle the seal with care.
Be sure unit is grounded and power disconnected before
attempting any work on pump or motor.
Removal of Old Seal
Refer to Figure 2 for Mechanical Seal parts identification.
1. Disconnect all power to pump.
2. Close isolation valves to cut pump off from system.
3. Drain pump and strainer; be sure to vent pump.
4. Remove motor hold down bolts and bolts holding adapter/seal plate
(Key No. 6, Page 14) to volute (Key No. 20). Slide motor, adapter/seal plate
and impeller (Key No. 12) backward to clear volute.
5. Remove impeller screw and washer from end of shaft and slide impeller off
of shaft.
6. Unbolt adapter/seal plate from motor.
7. Use two screwdrivers (Figure 3) 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 may come off with seal.
8. Use hammer, if necessary, to drive shaft sleeve out of seal. Clean up shaft
sleeve with fine emery paper if necessary.
9. Place adapter/seal plate face down on bench and drive old stationary half
of seal out of adapter/seal plate by carefully tapping with screwdriver and
hammer (Figure 4).
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.
Installing New Seal
1. NOTICE: 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.
2. Clean polished surface of ceramic seat with clean cloth.
3. Wet O-Ring around ceramic seat with liquid soap.
4. Press stationary (ceramic) half of seal into seal cavity firmly and squarely
with thumb pressure. If it does not seat properly, remove and place seal
face up on bench. Re-clean adapter/seal plate cavity. Seal should now seat
correctly.
5. If seal does not seat after re-cleaning adapter/seal plate cavity, place a card-
board washer over polished face of seal and carefully press into place
using a piece of 1” standard pipe as a press (Figure 5).
Hazardous
voltage
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
1" Standard Pipe
Stationary Seat
Cardboard
Washer
(Supplied with seal)
1422 1294
Stationary
Seat
Rotating
Seal
Spring
1419 1294
Figure 2