State Water Heaters Utra-Force STC-077 User Manual

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State Water Heaters Utra-Force STC-077 Specifications

General

Brand	State Water Heaters
Model	Ultra-Force STC-077
Tank Capacity	77 gallons
Maximum Temperature	180°F
Voltage	480V
Insulation	Non-CFC foam

Summary

INSTALLATION

GAS REQUIREMENTS

VENTING

AIR REQUIREMENTS

MAKE-UP AIR

INSUFFICIENT MAKE-UP AIR

OPERATION

SEQUENCE OF OPERATION

Describes the step-by-step heating cycle from call for heat to standby.

CONTROLS

TROUBLESHOOTING

PRE-SERVICE TIPS

Essential checks and conditions to verify before starting troubleshooting.

120 VAC TO CONTROL

Tests for 120 VAC power supply at the control board's CN1 terminal.

TRANSFORMER

Checks for 120 VAC input and 24 VAC output from the transformer.

ECO CHECK

Verifies 24 VAC presence at the ECO probe and ensures proper function.

TEMPERATURE PROBE

Checks the resistance of the upper and lower temperature probes.

PRESSURE SWITCH CONTINUITY

Tests for continuity between pressure switch terminals.

BLOWER

Checks for 120 VAC power supply to the blower motor.

PRESSURE SWITCH PERFORMANCE

Measures air and gas pressures and checks switch continuity during operation.

120 VAC TO IGNITOR

Tests for 120 VAC power supply to the ignitor during warm-up.

IGNITOR RESISTANCE CHECK

Measures the resistance of the hot surface ignitor (HSI).

GAS VALVE TEST

Checks for 24 VAC supply to the gas valve during ignition trial.

GAS PRESSURE CHECK

COMPONENT INFORMATION

PRESSURE SWITCHES

WIRING DIAGRAMS

SUF 150, 199, 240 WIRING DIAGRAM

ERROR CODES

ERROR CODE DESCRIPTIONS

SERVICE CHECKLIST

PRE-SERVICE CHECKLIST