A.O. Smith ST1302 User Manual

A.O. Smith ST1302

52 pages

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APPLICATION

A.O.Smith

Motor

Master y

University

INCLUDES:

SWIMMING POOLS

SPA & JETTED TUB

JET PUMPS

INSTALLATION TIPS

REPAIR

TROUBLESHOOTING

OTHER MODULES INCLUDE:

HEATING, VENTILATION,

AIR CONDITIONING &

REFRIGERATION MOTORS

GENERAL PURPOSE MOTORS

SPECIAL PURPOSE MOTORS

PUMP

MOTORS

A.O. SMITH

A.O. SMITHA.O. SMITHA.O. SMITHA.O. SMITH

http://waterheatertimer.org/Color-codewire.html#motor

Table of Contents

Questions and Answers:

J
John MannAug 17, 2025
How to troubleshoot A.O. Smith ST1302 that won't start (no sound)?
- U
  ufrancoAug 17, 2025
  To troubleshoot an A.O. Smith Engine that fails to start and makes no sound, begin by checking the voltage at the motor line terminals, ensuring it corresponds with the motor nameplate rating (±10%). Next, inspect all electrical connections at the motor terminal board. If no voltage is present, check fuses, timers, and switches. If the protector has tripped, allow the motor to cool before restarting, and check the protector for continuity.
J
Jose RoweAug 22, 2025
How to fix noisy A.O. Smith Engine operation?
- R
  Rebecca ThompsonAug 22, 2025
  If your A.O. Smith Engine is operating noisily, check the motor coupling, brackets, and other attached parts for proper adjustment and tightness. Inspect the motor bearings. Also, check for pump cavitation.
R
Rachel ClarkAug 28, 2025
What to do if A.O. Smith ST1302 gives an electrical shock?
- S
  Stephen VargasAug 28, 2025
  If you experience an electrical shock from your A.O. Smith Engine, immediately check the motor windings, all motor wiring, and the capacitor for grounding issues.

A.O. Smith ST1302 Specifications

General

Brand	A.O. Smith
Model	ST1302
Category	Engine
Language	English

Summary

Pump Motor Introduction and Types

Motor Type Overview

Details five distinct electrical designs of pump motors, including split phase, capacitor start, and PSC.

Pump Motor Selection and Specifications

Key Selection Criteria

Outlines steps for choosing a replacement motor, focusing on end frame, voltage, and horsepower.

Service Factor and Horsepower

Details the meaning of service factor and how to interpret motor nameplate amp ratings.

Pump Motor Troubleshooting and Testing

Failure to Start Diagnosis

Covers common reasons for motors not starting or only humming, like voltage or switch issues.

Motor Component Testing

Details procedures for testing critical motor components like grounds, windings, capacitors, and switches.

Start Switch Operation and Adjustment

Covers visual checks, contact conditions, and adjustment procedures for motor start switches.

Pump Motor Maintenance and Replacement

Bearing Replacement Procedures

Step-by-step instructions for removing old bearings and installing new ones.

Motor Replacement Reminders

Offers crucial reminders for motor replacement, focusing on failure causes and matching specifications.

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