American Standard HVAC YCY048G1H Manual

The American Standard YCY048G1H is a high-efficiency residential gas furnace with a 48,000 BTU input capacity, featuring a durable aluminized steel heat exchanger, electronic ignition, variable-speed blower motor, and compatibility with single-stage thermostats. It is designed for reliable heating performance, quiet operation, and energy savings. Below are key sections covering safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Aluminized steel primary heat exchanger, electronic hot surface ignitor, induced draft combustion system, variable-speed ECM blower motor, integrated control board, pressure switch, and flame sensor.

Installation

Unpack and inspect unit for damage. Ensure location meets clearance requirements.

1. Position furnace: Place on level, solid surface in approved location (closet, attic, basement).
2. Connect gas line: Use black iron pipe; apply leak detection solution to check for leaks.
3. Connect venting: Use approved PVC pipe for combustion air intake and exhaust.
4. Connect electrical: 120V AC power supply; ensure proper grounding.
5. Connect thermostat: Low-voltage wiring (R, W, G, C).
6. Install air filter: Insert clean 1-inch filter into filter rack.

WARNING! Installation must comply with local codes and be performed by a qualified technician. Gas leaks can cause explosion or fire.

First-Time Setup

After installation, perform initial startup and configuration.

1. Power on: Turn on electrical power and gas supply.
2. Set thermostat: Place thermostat in HEAT mode, set temperature above room temp.
3. Check ignition: Furnace should ignite within 60 seconds; observe flame through viewport.
4. Verify airflow: Ensure registers are open; check air temperature rise (specified on rating plate).
5. Configure blower speed: Adjust dip switches on control board for proper CFM if needed.

CAUTION! Do not bypass safety devices. If furnace fails to start, turn off power and gas before troubleshooting.

Specifications

• Model: YCY048G1H
• Input BTU: 48,000 BTU/hr
• Output BTU: 38,400 BTU/hr (80% AFUE)
• Fuel Type: Natural Gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5 Amps
• Blower Motor: Variable-speed ECM, 1/3 HP
• Airflow: 800-1200 CFM adjustable
• Vent Size: 2-inch PVC intake and exhaust
• Dimensions (HxWxD): 40" x 17.5" x 21"
• Weight: 98 lbs

Controls and Settings

Control board located behind lower access panel. LED indicator for diagnostics.

Thermostat: HEAT/COOL/OFF, FAN AUTO/ON, temperature setpoint.

Control Board DIP Switches: Configure blower speed (COOL/HEAT), timing delays. Gas Valve: Manual shutoff, pressure regulator. Limit Switch: High-temperature safety cutoff. Pressure Switch: Verifies draft inducer operation. Flame Sensor: Sends signal to control board when flame detected.

Connecting Thermostat

Use 18-gauge thermostat wire. Connect to control board terminals.

1. Turn off power at furnace and thermostat.
2. Remove access panel to expose control board.
3. Connect wires: R (24V power), W (Heat), G (Fan), C (Common).
4. Secure connections; replace panel.
5. Restore power; test thermostat operation.

Tip: Use a programmable thermostat for optimal energy efficiency.

Operating the Furnace

Normal heating cycle operation.

1. Call for heat: Thermostat sends signal to control board.
2. Inducer fan starts: Pressure switch closes.
3. Ignition: Hot surface ignitor glows; gas valve opens.
4. Flame detection: Sensor confirms ignition; ignitor shuts off.
5. Blower starts: After heat exchanger warms (typically 30-60 second delay).
6. Cycle off: When thermostat satisfied, gas valve closes; blower runs post-purge.

WARNING! Never block air vents or returns. Ensure filter is clean to prevent overheating.

Maintenance Procedures

Annual maintenance recommended. Turn off power and gas before servicing.

1. Replace air filter: Every 1-3 months during heating season.
2. Clean flame sensor: Use fine sandpaper or steel wool.
3. Inspect heat exchanger: Check for cracks or corrosion.
4. Check vent system: Ensure no obstructions in PVC pipes.
5. Lubricate blower motor: Only if equipped with oil ports (most ECM motors are sealed).

Care & Cleaning

Keep furnace area clean and free of debris. Vacuum around unit periodically.

CAUTION! Do not use water or chemical cleaners on electrical components. Keep insulation and flammable materials away from furnace.

Regulatory Information

Complies with ANSI Z21.47/CSA 2.3 standards for gas-fired central furnaces. UL listed. Manufactured to meet U.S. Department of Energy efficiency standards. For technical support, contact American Standard at 1-800-332-1119 or visit www.americanstandardair.com.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore. Check control board LED for flash codes.

Service: 1-800-332-1119; www.americanstandardair.com