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Pentair
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7TMH-350

Pentair 5TMH-250, 5TMH-75, 5TMH-375, 5TMH-425, 6TMH-140 Owner's/operator's Manual

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Owner’s/Operator’s Manual
TMH Series
Submersible
READ AND FOLLOW SAFETY
INSTRUCTIONS!
This is the safety alert symbol. When you see this symbol on your pump or in this manual, be alert to the
potential for personal injury.
warns about hazards that will cause serious
personal injury, death or major property damage if ignored.
personal injury, death or major property damage if ignored.
minor personal injury or property damage if ignored.
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.
California Proposition 65 Warning
chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.
warns about hazards that can cause serious
warns about hazards that will or can cause
This product and related accessories contain
Turbine
INSTALLATION / OPERATION
MAINTENANCE
Table of Contents:
Safety ................................................................1
General Considerations ....................................1
Specifications ....................................................2
Installation .........................................................3
Service ..............................................................5
Electrical Tests .................................................6
Pump / Motor Separation ..................................6
Pump Disassembly ...........................................6
Pump Inspection / Maintenance .......................7
Preventive Maintenance ...................................7
BE972 (Rev. 05/25/16)
GENERAL CONSIDERATIONS
Before installing your submersible turbine pump, review the following:
Clear well of sand and abrasive material before installing pump. Abrasive materials in the water cause component
wear and reduce pump capacity and discharge pressure. Never use the pump to develop or clean the well. Permanent pump damage can result within the first few hours of operation.
Align well casing. If the well casing is suspected of being crooked, check it with a gauge of identical length and diameter as the pump and motor with two lengths of pipe attached. Serious dam age can result if the pump becomes lodged in a crooked casing.
Be sure the well can supply a high-capacity turbine pump. The well should be deep enough to cover the pump
unit with water, even at extreme pumping rates. Typically, the pump should be submerged 10 to 20 feet below the lowest water level and at least 5 feet above the bottom of the well.
Prime pump. Air entrained in the water reduces performance and will dam age the pump.
NOTICE: Do not inter change controls with other models. Serious damage can result to the unit if pump and controls do not match.
Motor control systems and pump units are repairable in the field. To avoid serious damage to the unit, use only parts obtained from authorized dealers/suppliers. System controls and pump must match.
Average number of starts per day will influence motor and control component life (starters, relays, capacitors, etc). Select pump size, tank size and control components for lowest practical number of starts per day. Excessive cycling accelerates bearing, spline, and pump wear and con trol contact erosion.
Your pump is designed to provide maximum efficiency under specific capacity and head conditions. Do not oper ate it beyond specified limits.
SPECIFICATIONS
Table 1: Frequency of Starts
Avg. No. of Starts per 24 Hr. Day
HP Rating Single Phase Three Phase
1 to 5 50 150 7-1/2 to 30 25 50 40 and over – 50
Table 2: Weight of Pipe (Column)
Weight per Foot (Lbs)
Pipe Size (In) Full Empty
2-1/2 7.9 5.8 3 10.8 7.6 4 16.3 10.8 5 23.3 14.62 6 31.5 18.97
Table 3: Weight of Cable per 1000 Ft. (lbs.)
AWG 3-Phase 1-phase Size Nom. Dia. Weight Nom. Dia. Weight
12-3 .500 140 .487 130 10-3 .545 186 .517 161 8-3 .771 328 .750 293 6-3 .965 525 .826 400 4-3 1.071 717 2-3 1.243 1066
Table 4: Cable Wire Resistance
AWG Wire Size Resist (Ohms/Ft)
14 .0050 12 .0032 10 .0020 8 .0013 6 .0008 4 .0005 2 .0003
Table 5: Minimum Cooling Water Flow
ID of
Casing
7 20 (76) 0.23 15 (57) 0.33
8 30 (114) 0.25 30 (114) 0.36
10 50 (189) 0.24 60 (227) 0.35
12 80 (303) 0.25 100 (379) 0.36
14 110 (416) 0.25 140 (530) 0.35
16 150 (568) 0.25 180 (681) 0.33
4” Motors 6” Motors
Flow GPM
(LPM)
FPS
Flow GPM
(LPM)
FPS
PRE-INSTALLATION PROCEDURES
Electrical Splices and Connections
Splices must be waterproof. Make a strong mechanical bond between the motor leads and the cable to avoid high resistance at the connection. A poor mechanical con nection, or a poorly wrapped splice, can cause motor problems and motor failure.
Before connecting the motor to the cable, perform a ground check to assure that the motor has not been damaged. Attach one end of an ohmmeter lead to any of the three motor leads and the other ohmmeter lead to the pump intake bracket. A new motor must have a resistance of 2 megohms or greater. If not, contact your dealer. Repeat for all three leads.
Prepare the cable and make the mechanical connections (Figure 1A) and splices as follows:
a.
3"
3"
1
"
b.
c.
Figure 1A: Cable Splicing: Solid Wire, Stranded Wire
1. Cut motor leads and corresponding cable ends at 3-inch
2. Cut connecting cable to match the motor leads.
3. When using a butt connector, expose bare wire for
NOTICE: Butt connectors may be used with solid wires
4. Clean exposed ends of wire thoroughly with emery
5A. BUTT CONNECTORS (Figure 1A): Insert wires into con-
5B. SOLDERED CONNECTIONS (Figure 1A):
NOTICE: Do not use acid core solder or corrosive solder paste.
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spacings to stagger connections for a smooth splice.
NOTICE: Match color coded wires, red to red, black to black, and white to white.
about 1/2”. When using stranded wire, expose about 1” of wire.
through 8 AWG, or stranded wires through 10 AWG.
cloth or sandpaper to assure good electrical connections.
nector until insulation butts up against connector. Crimp connector to wires with a pair of crimping pliers. Pull on cable to make sure the connection is solid and tight.
I. Straighten individual cable strands and spread
apart slightly.
II. Clean each strand and push strands of cable into
matching (color-coded) open strands of the motor leads.
Formula to find flow rate:
GPM x .409
FPS = D12 – D22
D1 = Casing inside diameter D2 = Motor outside diameter
NOTICE: If flow rate past motor is expected to be less than rate shown in table, install a shroud around motor to force cooling flow past shell. To minimize erosion to shell if flow rate is expected to be more than 10 FPS (especially if sand is present), reduce flow through pump to reduce flow past shell.
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III. Wrap entire length of joint with fine copper wire
3"
3"
"
1 2
a.
b.
c.
until strands are compressed.
IV. Apply heat and solder. Solder will follow the heat;
make sure solder flows throughout the joint. Pull firmly on cable to test joint.
6. Repeat Step 5 for each lead.
7. Taping splice (Figure 1B):
Because friction tape is not water
resistant, never use friction tape on a water-tight splice. Use Scotch
®
Number 33, or equivalent.
4. If leak is not in splice, slowly pull cable out of water until reading changes to “infinity”. Reading will change to “infinity” when leak comes out of water.
5. Repair cable by splicing as explained under “Electrical Splices and Connections”, Page 2.
Rotation Check (3-Phase Only)
After satisfactorily completing continuity test, connect cable to pump controller. Check 3-phase motors for correct rotation. If necessary, reverse any two cable leads at the controller and recheck rotation. Permanently mark and match to control box terminals for future reference.
d.
Connect cable to motor controller and then wire controller to disconnect switch. Connect temporary jumper wire between proper terminals in controller to temporarily
e.
energize magnetic coil.
Momentarily engage disconnect switch and note direction of rotation. The shaft should rotate counterclockwise when
Figure 1B: Stagger splices and tape
7A. Clean joints and adjoining cable/wire insulation of all
grease and dirt, and build up joint area with tape until it matches diameter of cable.
7B. Starting 1-1/2” back from the joint, firmly apply one
viewed from the top or shaft end of the motor. If rotation is incorrect, reverse any two wires; mark wires to correspond with the controller terminal numbers.
NOTICE: Pump is water lubricated. Do not operate the pump for more than 5 seconds while it is out of water.
layer of tape, overlapping about half the previous lap and continuing approximately 1-1/2” beyond joint. Cut tape evenly and press both ends firmly against cable.
7C. Apply two additional layers of tape, as described in
Step 7B, beginning and ending 1-1/2” beyond the previous starting/ending points.
Splice and Cable Continuity Test
Before installing pump check cable and splices as follows (see Figure 1C):
1. Submerge
Ohmmeter set at Rx100K or Voltmeter set at H1 Ohms
Attach lead to metal tank or immerse in water
cable and splice in steel barrel filled with
General
After completing all connections and tests, connect a 5-foot length of pipe to pump.
Lower pump into well with pipe clamps attached to the 5-foot pipe. Attach a standard length of pipe to 5-foot length and lower pump CAREFULLY into well.
NOTICE: Do not use a pipe longer than 5 feet for the first con nection. Hoisting pump upright with a long length of pipe can cause pump misalignment from excessive leverage.
and cable to avoid damage to cable insulation.
INSTALLATION
Use extreme care when lowering pump
water. Make sure both ends of cable are out of water.
2. Clip one ohmmeter lead to barrel.
Figure 1C: Splice and Cable continuity
Test each lead in cable successively by connecting the other ohmmeter lead to the three cable leads, one after the other.
3. If resistance reading goes to zero on any cable lead,
a leak to ground is present. Pull splice out of water. If meter reading changes to “infinity” (no reading) the leak is in the splice.
Anchor power cable to pipe every 20 feet with adjustable steel band clamps. Protect insulation from clamps with pieces of split rubber hose inserted between clamps and cable. Attach cable to pipe halfway between clamps with waterproof tape.
SUBMERGENCE
Be sure the pump is always submerged, especially at extreme pumping rates. Install pump at least 10 to 20 feet below the lowest “drawdown” water level and at least 5 feet above bottom of well.
Check Valves
NOTICE: Pump back spin and hydraulic shock can cause
severe damage to pump and motor. Install at least one check valve to help prevent this.
Install check valve in discharge pipe, not more than 25 feet above pump. For 6” and larger submersible pumps installed more than 600 feet deep, install a second check valve at the pipe joint nearest to the half-way point between pump and
Scotch® is a registered trademark of 3M Company.
ground level.
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NOTICE: To avoid water hammer and pipe breakage, distance from first check valve to second check valve should not equal distance from second check valve to ground level.
Well and Pump Test
Check and record static water level of well before starting tests. Before making final piping connections, test flow rate, capacity, and condition of well.
Do not operate pump with discharge valve closed.
Operate pump only within pressure and flow limits of operating range established by performance curve. Operating pump outside of pressure and flow limits can damage bearings and over heat the motor.
NOTICE: If sand is present in discharge, allow pump to run with discharge completely open until water is clear. If loud rattling noises develop, pump is probably cavitating. Gradually close discharge valve until rattling stops. Operating with sand in the water or while cavitating can cause serious internal erosion to impellers and bowls.
Installation - Electrical Tests
Risk of high voltage electrical shock when
testing. Can stun, burn, or kill. Only qualified electricians
should perform these tests. When testing, use all normal precautions for the voltages involved.
NOTICE: Readings more than 10% above or below rated nameplate voltage can damage pump; correct before placing pump in service. Test as follows:
1. Disconnect main power supply and open controller.
2. Connect power and start pump. For 3-phase motors, read voltage across three pairs of leads (L1 – L3, L3 – L2, L2 – L1) while pump is operating. For single phase motors, read voltage across L1 and L2 while pump is operating. Voltage should be within ±10% of motor nameplate rated voltage. If not, consult power company.
Load current test (Figure 3)
Controller
G
L3
Incoming
L2
Power
L1
Ground
Electrical test of motor, cable, connections
The cable and splices can be damaged as the pump is lowered into the well. To electrically test them, attach one lead of ohmmeter to pipe. Attach other lead to each cable lead in turn. See motor owner’s manual for required resistance in a good motor. A low reading indicates that cable or splice has developed a leak to ground. Remove pump from well and correct problem before proceeding with installation.
Measure electrical resistance between motor leads and well casing when motor is cold.
Voltage test (Figure 2)
Low or high voltages can cause motor failure. While pump is operating, check voltage across each pair of leads at motor controller.
Controller
G
L3
Incoming
L2
Power
L1
Ground
Figure 2: Voltage Test
To Pump
To Pump
Figure 3: Load Current Test
Load current should be obtained on each motor lead at the controller. Partially close pump dis charge valve (keep pressure and flow within specified operating range) until maximum amp reading has been obtained. Compare reading with motor nameplate rating. If reading is 15 percent or more over rated load, check for incorrect voltage in supply line or overload due to abrasives in pump. Find and correct problem before putting pump in service.
THREE-PHASE CURRENT
UNBALANCE
Determine current unbalance by measuring current in each power lead. Measure current for all three possible hookups. Use example and worksheet (Page 5) to calculate current unbalance on a three phase supply system and retain for future reference.
NOTICE: Current unbalance should not exceed 5%. If unbalance cannot be corrected by rolling leads, locate and correct source of unbalance.
If, on all three possible hookups, the reading furthest from average stays on the same power lead, most of the unbalance is coming from the power source.
However, if the reading furthest from average changes leads as the hookup changes (that is, stays with a particular motor lead), most of the unbalance is on the “motor side” of the starter. In this case, consider a damaged cable, leaking splice, poor connection, or faulty motor winding.
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Current Unbalance Example and Worksheet
3-Phase Current Unbalance - Example
Here is an example of current readings at maximum pump loads on each leg of a three wire hookup. Make cal cu lations for all three possible hookups.
A. For each hookup, add the readings for the three legs: Ex.: Hookup #1 Hookup #2: Hookup #3 L1 = 51Amps L1 = 50 Amps L1 = 50 Amps L2 = 46 Amps L2 = 48 Amps L2 = 49 Amps L3 = 53 Amps L3 = 52 Amps L3 = 51 Amps
Total 150 Amps Total 150 Amps Total 150 Amps
B. Divide each total by three to get average amps: Example: 150/3 = 50 Example: 150/3 = 50 Example: 150/3 = 50
C. For each hookup, find current value farthest from
aver age (Calculate the greatest current difference from the average).
Ex. #1 Ex. #2 Ex. #3 50 Amps 50 Amps 50 Amps
–46 Amps –48 Amps –49 Amps
= 4 Amps = 2 Amps = 1 Amps
D. Divide this difference by the average and multiply by
100 to obtain the percentage of unbalance. Example:
Ex. 1: 4/50 = .08 x 100 = 8% Ex. 2: 2/50 = .04 x 100 = 4% Ex. 3: 1/50 = .02 x 100 = 2%
Use smallest percentage unbalance, in this case Ex. 3.
3-Phase Current Unbalance - Worksheet
Use this worksheet to calculate current unbalance for your installation.
A. Add the readings for the three legs: Ex.: Hookup #1 Hookup #2: Hookup #3 L1 = Amps L1 = Amps L1 = Amps L2 = Amps L2 = Amps L2 = Amps L3 = Amps L3 = Amps L3 = Amps
Total Amps Total Amps Total Amps
B. Divide each total by three to get average amps: Hookup #1: /3 = Hookup #2: /3 = Hookup #3: /3 =
C. For each hookup, find current value farthest from
aver age (Calculate the greatest current difference
from the average). Hookup #1 Hookup #2 Hookup #3 Amps Amps Amps Amps Amps Amps
Amps Amps Amps
D. Divide this difference by the average to obtain the
percentage of unbalance:
Hookup #1: / = x100 = %
Hookup #2: / = x100 = %
Hookup #3: / = x100 = %
Use hookup with smallest percentage unbalance.
SERVICE
General
When installed in a clear well and operated under normal conditions, the submersible turbine pump requires no special maintenance. The hermetically sealed motor is pre­filled and self-lubricating. Completely tested at the factory, it should provide many years of dependable service. The motor is a continuous duty type and can operate continuously for long periods.
Removing Pump From Well
Most pump problems are caused by above-ground electrical problems. Minor control box components or outside electrical difficulties (such as low voltage) can cause a mal function. Before removing pump from well, check motor windings for damage (check winding resistance with an ohmmeter – see Page 6). Eliminate all above-ground trouble causes before pulling pump. Pull the pump only as a last resort.
Sandlocked Pump:
NOTICE: Before pulling pump, make all possible above
ground electrical tests. Most submersible pump problems are above ground, not in the pump itself.
NOTICE: Motor failure can result from starting a sand­locked pump. Do not bypass overload circuit or exceed electrical rating when trying to start a seized pump.
Remove a sandlocked pump from well for cleaning. To prevent pump from locking again when reinstalled, clean the well thoroughly before reinstalling the pump.
Cleaning Sandlocked Pump:
1. Insert a reducing bushing in discharge adapter cap to
receive a hose coupling.
2. Use a hose to flush pump backwards (discharge
to suction). Oscillate shaft backwards and forwards with a pump pliers and backwash pump for several minutes.
3. If pump cannot be freed, disconnect pump from motor,
disassemble liquid end (see Page 6) and backwash sand from each part.
Checking Pump Performance:
Water containing abrasives can cause impeller wear and reduce impeller efficiency, resulting in reduced performance. In such cases, it is necessary to remove the pump from the well and replace the impellers to maintain capacity and pressure. To assure quality and integrity of the unit, re place with genuine parts available from your dealer.
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