American Standard HVAC YSC036A Manual

The American Standard YSC036A is a high-efficiency residential gas furnace designed for reliable heating performance. This condensing furnace features variable-speed blower technology, durable heat exchanger construction, compatibility with various thermostat systems, and quiet operation. It operates on natural gas with multiple firing rates, includes diagnostic LED indicators, and requires professional installation. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to Thermostat 7. Operating Instructions 8. Maintenance Procedures 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Variable-speed ECM blower motor, Secondary heat exchanger, Diagnostic LED, Gas valve with modulating control, Pressure switches, Flue outlet, Condensate drain connection, Filter rack.

Feature	Description
Variable-speed blower	Provides consistent airflow and quiet operation
Condensing technology	High efficiency by extracting heat from flue gases
Modulating gas valve	Adjusts heat output in small increments for comfort
Diagnostic LED	Flashing codes for troubleshooting
Dual-port induced draft	Ensures proper venting and safety
Filter access	Easy-to-reach standard 1" filter slot
Pressure switch tubing	Monitors vent system pressure
Flue gas outlet	PVC vent connection for sidewall or roof
Condensate drain	Removes condensation from heat exchanger
Gas line connection	1/2" NPT for natural gas supply

Installation Requirements

Unpack and inspect for shipping damage. Ensure proper location with clearance requirements.

Location: Install in approved area (closet, utility room, basement) with required clearances.
Venting: Use approved PVC pipe for intake and exhaust; follow local codes.
Gas connection: Connect to gas supply with shutoff valve; pressure test for leaks.
Electrical: Connect to 120V AC power with proper grounding.
Condensate drain: Route to floor drain or condensate pump.
Ductwork: Connect supply and return ducts; ensure proper sizing.

WARNING! Installation must be performed by qualified HVAC technician in accordance with all codes. Gas furnaces can produce carbon monoxide.

First-Time Setup

After installation, perform initial startup and configuration.

Power on: Turn on electrical power and gas supply.
Thermostat connection: Connect compatible thermostat (single-stage or communicating).
Blower speed adjustment: Set cooling and heating speeds per installation requirements.
Test operation: Initiate heating cycle from thermostat and verify proper operation.
Check venting: Verify proper draft and condensate flow.

CAUTION! Never bypass safety controls. Ensure proper combustion air supply.

Specifications

Model: YSC036A
Input BTU/h: 36,000 (3 ton equivalent)
AFUE Rating: Up to 96%
Gas Type: Natural gas
Electrical: 120V, 60Hz, 5.8 amps
Blower Motor: Variable-speed ECM
Heat Exchanger: Stainless steel secondary
Venting: PVC (2" intake, 2" exhaust)
Dimensions (HxWxD): 40" x 17.5" x 28"
Shipping Weight: 125 lbs
Sound Rating: As low as 65 dB

Controls and Settings

Integrated control board with diagnostic capabilities. Access via control panel cover.

Control Board: LED diagnostic indicator, DIP switches for configuration, terminal strip for thermostat connections.

DIP Switch Settings: Heating airflow (CFM), Cooling airflow (CFM), Fan on delay, Thermostat type selection. Diagnostic LED: Green for normal operation, flashing codes for faults (1 flash = pressure switch, 2 flashes = ignition failure, etc.). Blower Speeds: Adjustable for heating and cooling modes via DIP switches. Gas Valve: Modulating with ignition control.

Connecting to Thermostat

Compatible with most 24V thermostats. For communicating thermostats, additional wiring may be required.

Turn off power to furnace at disconnect switch.
Remove control board access panel.
Connect thermostat wires to terminal strip (R, C, W, G, Y).
For two-stage operation: Connect W2 terminal if available.
Restore power and test thermostat operation.

Tip: Use 18-gauge thermostat wire. Ensure proper polarity for C (common) wire.

Operating Instructions

Operation is controlled through thermostat. Furnace cycles automatically based on temperature demand.

Set thermostat to desired temperature and "Heat" mode.
Furnace will initiate startup sequence: inducer motor on, pressure switch check, igniter warm-up, gas valve opening.
Once ignited, blower will start after brief delay.
When thermostat satisfied, gas valve closes, blower continues for post-purge.
For continuous fan operation, set thermostat to "Fan On."

WARNING! Never operate without filter. Strange odors on first startup are normal as manufacturing oils burn off.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity. Annual professional service recommended.

Monthly: Check and replace air filter if dirty.
Annual (by technician): Inspect heat exchanger, clean burners, check gas pressure, test safety controls, clean condensate system, check venting.
Seasonal: Ensure vents are clear of debris, check condensate drain for clogs.

CAUTION! Turn off power and gas before any maintenance. Only qualified technicians should service gas components.

Regulatory Information

UL listed. ANSI Z21.47/CSA 2.3 certified. Meets U.S. Department of Energy efficiency standards. Manufactured to comply with applicable safety and performance standards. For technical support, contact American Standard at 1-800-332-1111 or visit www.americanstandardair.com. Keep this manual for future reference.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, ensure door panels secure.
No heat	Gas supply, ignition	Verify gas valve on, check for ignition lockout (LED code).
Blower runs continuously	Thermostat setting	Check thermostat fan setting (Auto vs On).
Furnace short cycles	Filter, airflow	Replace dirty filter, check for blocked vents/registers.
Unusual noises	Mechanical issues	Check for loose panels, inducer motor bearings, ductwork vibration.
Error code flashing	System fault	Count LED flashes and refer to fault code chart in manual.
Condensate leak	Drain blockage	Clear condensate drain line and trap.

Reset: To reset after lockout, turn power off for 30 seconds then restore.

Service: 1-800-332-1111; www.americanstandardair.com