American Standard HVAC YSC072 Manual

The American Standard YSC072 is a high-efficiency residential gas furnace designed for reliable heating performance. This manual covers safety information, installation procedures, operation instructions, maintenance guidelines, and troubleshooting for the YSC072 model. Below are key sections for proper handling, setup, and operation of your HVAC system.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operating Modes 8. Maintenance Schedule 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-efficiency heat exchanger, Electronic ignition system, Multi-speed blower motor, Integrated control board, Safety switches, Flue vent connection, Gas valve assembly.

Feature	Description
Heat Exchanger	Stainless steel primary and secondary for high efficiency
Ignition System	Hot surface electronic ignition for reliable starts
Blower Motor	Variable speed ECM motor for quiet operation
Control Board	Microprocessor-based for precise temperature control
Safety Switches	Limit switches and pressure switches for safe operation
Vent Connection	PVC venting compatible for sidewall or roof termination
Gas Valve	Modulating gas valve for precise fuel control
Filter Rack	Standard 1-inch or 4-inch media filter compatible
Drain Connection	Condensate drain for high-efficiency operation
Service Lights	LED status indicators for diagnostics

Installation

Unpack and inspect all components. Ensure proper location with adequate clearance.

Position furnace: Place on level surface in approved location with proper clearances.
Connect gas supply: Use approved gas piping with shutoff valve; pressure test for leaks.
Connect electrical: Follow local codes; connect to dedicated circuit with proper grounding.
Install venting: Use approved PVC piping for combustion air and flue gases.
Connect ductwork: Secure supply and return ducts with proper sealing.
Install condensate drain: Route to approved drain location with trap.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

After installation, perform initial startup and configuration.

Verify all connections: Check gas, electrical, venting, and drain connections.
Install air filter: Insert proper size filter in filter rack.
Power up: Turn on electrical power and gas supply.
Configure thermostat: Install compatible thermostat and set heating parameters.
Test operation: Run through complete heating cycle to verify proper operation.
Check airflow: Verify proper airflow at all registers.

CAUTION! Never operate furnace without proper venting and air filter installed.

Specifications

Model: YSC072
Heating Capacity: 72,000 BTU/HR
Efficiency: Up to 96% AFUE
Gas Type: Natural Gas (LP conversion kit available)
Electrical: 115V, 60Hz, 1.5 Amps
Blower Motor: ECM variable speed
Dimensions: Refer to installation manual for exact measurements
Venting: Category IV, PVC pipe approved
Sound Level: Ultra-quiet operation design
Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Settings

Access control board via front panel. Status lights indicate system operation.

Control Board: LED indicators for power, heat, fan, error codes.

Thermostat Settings: Heat/Off/Cool mode selection, Temperature setpoint, Fan Auto/On, Program schedules.

DIP Switches: Configure blower speeds, heating stages, thermostat compatibility.

Service Mode: Access diagnostic codes and test modes for service technicians.

Connecting Thermostat

Compatible with most 24V thermostats including programmable and smart models.

Turn off power to furnace at circuit breaker.
Remove thermostat cover and disconnect wires.
Connect wires to control board: R (24V), W (Heat), G (Fan), C (Common).
Secure connections and replace covers.
Restore power and configure thermostat settings.

Tip: Use thermostat with appropriate staging for optimal efficiency.

Operating Modes

Heating operation controlled by thermostat signals.

Standby Mode: Thermostat satisfied, system waiting for heat call.
Ignition Sequence: Pre-purge, igniter warm-up, gas valve opening, flame verification.
Heating Mode: Burner operation with blower activation after heat exchanger warm-up.
Fan Operation: Circulates air through duct system; can run continuously or auto.
Shutdown: Burner off, post-purge, blower continues until heat exchanger cools.

WARNING! Do not attempt to manually override safety controls or ignition sequence.

Maintenance Schedule

Regular maintenance ensures efficiency and longevity.

Frequency	Maintenance Task
Monthly	Check and replace air filter if dirty
Seasonal	Inspect vent pipes for obstructions
Annually	Professional inspection and cleaning
Annually	Check heat exchanger for cracks
Annually	Verify gas pressure and combustion
Annually	Clean blower assembly and motor
Annually	Check condensate drain and trap

Care & Cleaning

Turn off power before any cleaning. Use soft brush and vacuum for internal components.

CAUTION! Never use water or liquid cleaners on electrical components. Keep area around furnace clear of combustible materials.

Regulatory Information

UL listed and ANSI approved. Complies with National Fuel Gas Code NFPA 54. Manufactured to meet DOE efficiency standards. For technical support, contact American Standard at 1-800-428-4328 or visit www.americanstandardair.com. Installation must comply with all local building codes and regulations.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power off, thermostat setting	Check circuit breaker, thermostat set to heat above room temp
No heat	Gas supply, filter	Verify gas valve on, replace dirty air filter
Short cycling	Dirty filter, airflow	Clean/replace filter, check for blocked vents
Blower won't stop	Thermostat setting	Check thermostat fan setting (Auto vs On)
Error code flashing	System fault	Refer to diagnostic chart in service manual
Unusual odors	Dust burning off	Normal on first startup; persistent odors require service
Loud noises	Loose parts, airflow	Check for loose panels, improper duct sizing

Reset: Turn power off for 30 seconds, then restore to clear temporary faults.

Service: 1-800-428-4328; www.americanstandardair.com