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General Safety Information / Electrical
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.
Hazardous pressure. Under certain condi-
tions, submersible pumps can develop extremely high
pressure. Install a pressure relief valve capable of passing
entire pump flow at 75 PSI.
Do not allow pump, piping, or any other system
component containing water to freeze. Freezing may
damage system, leading to injury or flooding. Allowing
pump or system components to freeze will void warranty.
Hazardous voltage. Can shock, burn or
cause death. To avoid dangerous or fatal electric shock
hazard, use pump only in an effluent system. DO NOT
install pump in an open body of water ( a lake, swimming
pool, etc.).
Install, ground and wire pump according to local
and Canadian Electrical Code or National Electrical Code
requirements that apply.
Disconnect electrical power supply before installing
or servicing pump.
Make sure pump nameplate voltage and frequency
match line voltage and frequency of power supply.
TABLE 1: RECOMMENDED FUSING DATA
60 Hz/1 Phase 2-Wire Cable
Model
10MD05221
20MD05221
30MD05221
Volts/Hertz/
HP
Phase
1/2
115/60/1
1/2
115/60/1
1/2
115/60/1
1. Install pump according to all plumbing, pump and
well code requirements.
2. Install an all leg disconnect switch in the power supply
near the pump.
3. Two-wire motors are equipped with automatic thermal
overload protection which will open the circuit and
stop the motor when a thermal overload (excessive
heating) exists. When motor cools, overload will rest
and motor will restart automatically. This can cause
the pump to start unexpectedly and without warning.
GENERAL
Inspect pump for delivery damage. Report any damage to
shipping carrier or to Myers immediately.
Have any installation, repair, or service work done by your
Myers dealer.
Never run pump dry.
During system operation, pump must be submerged at all
times.
Pipe joint compound can cause cracking in plastics. Use
only teflon tape when sealing joints in plastic pipe or con-
necting pipe to thermoplastic pumps.
Warranty is void in the following conditions:
• Water is highly corrosive.
• If entrained gas or air present in water being pumped
reduce the flow and cause cavitation (which can dam-
age the pump).
• Pump has been operated with discharge valve closed
(severe internal damage will result).
ELECTRICAL
Wiring/Grounding
Hazardous voltage. Can shock, burn, or
cause death. Permanently ground pump, motor and con-
trol box before connecting power supply to motor.
Ground pump and motor in accordance with all codes
and ordinances that apply. All wiring must meet National
Electrical Code and Canadian Electrical Code (whichever
applies). Use copper ground wire at least as large as wires
carrying current to pump.
Pump is supplied with copper ground wire. Use only cop-
per wire for connections to pump.
Max.
Load
Amps
11.0
9.5
9.5
Locked
Fuse Size
Rotor
Standard/
Amps
Dual Element
30.0
15
30.0
15
30.0
15
2
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