The American Standard YCZ036F1/3MOA is a high-efficiency, single-stage, 3-ton residential gas furnace with a variable-speed blower motor, designed for upflow/horizontal installation. It features a durable aluminized steel heat exchanger, electronic ignition, integrated diagnostic controls, compatibility with various thermostats, and multi-speed airflow adjustment. Rated at 36,000 BTU/hr input with 96% AFUE efficiency. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.
Key components: Aluminized steel primary heat exchanger, Variable-speed ECM blower motor, Hot surface ignitor, Integrated control board with diagnostic LED, Multi-tap transformer, Flue outlet, Condensate drain connection, Gas valve with manual shutoff.
| Feature | Description |
|---|---|
| Heat Exchanger | Durable aluminized steel construction |
| Blower Motor | Variable-speed ECM for quiet operation and efficiency |
| Ignition System | Electronic hot surface ignitor (no standing pilot) |
| Control System | Integrated board with status LED for diagnostics |
| Vent Connection | 3" PVC flue outlet for sidewall or roof venting |
| Drain Connection | 3/4" PVC condensate drain port |
| Gas Valve | Includes manual shutoff and regulator |
| Airflow | Multi-speed settings adjustable via motor taps |
| Filter | Standard 1" or optional 4" media filter cabinet |
| Safety Devices | Limit switches, pressure switch, flame sensor |
Unpack and inspect unit for shipping damage. Ensure location meets clearance and venting requirements.
WARNING! Installation must comply with all local codes and ordinances. Gas fitting and electrical work should be performed by qualified technicians.
After installation, perform initial setup and verification before regular operation.
CAUTION! Do not bypass safety controls. If furnace fails to start or locks out, refer to diagnostic LED and troubleshooting section.
Primary control is via the integrated furnace control board and the wall thermostat.
Control Board: Located behind the lower access panel. Features a diagnostic LED that flashes error codes. Includes terminals for 24V thermostat connections (R, W, G, Y, C) and blower speed taps (COOL: HI/LO/MED, HEAT: HI/LO/MED).
Thermostat: Compatible with most single-stage heat/cool thermostats. For optimal performance, a programmable thermostat is recommended.
Blower Speed Adjustment: Change heating or cooling airflow by moving the wire to a different speed tap on the control board. Refer to installation manual for CFM charts based on external static pressure.
Gas Pressure Adjustment: Performed at the gas valve regulator using a manometer. Do not adjust unless qualified.
Tip: Use a level when mounting the thermostat. Ensure the C (common) wire is connected for proper operation of smart thermostats.
Operation is controlled by the wall thermostat.
WARNING! Do not attempt to adjust the gas valve or control board settings while the furnace is operating. Keep flammable materials away from the furnace.
Regular maintenance ensures efficiency, safety, and longevity.
CAUTION! Always turn off electrical and gas supply before performing any maintenance. Only qualified personnel should service the gas and electrical components.
This appliance is design-certified for use in the United States and Canada. It complies with ANSI Z21.47/CSA 2.3 standards for gas-fired central furnaces. Installation must conform with local building codes, and in the absence of local codes, with the National Fuel Gas Code (NFPA 54/ANSI Z223.1) or CAN/CGA B149 Installation Codes. The furnace contains safety devices which must not be bypassed. For technical support or to locate a dealer, visit www.americanstandardair.com or contact American Standard Heating & Air Conditioning at 1-800-526-2200.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Furnace will not start | No power, thermostat set wrong, gas valve off, door switch open. | Check circuit breaker, thermostat settings, gas valve position, ensure access panels are secure. |
| Blower runs but no heat | Ignition failure, gas supply off, faulty gas valve or ignitor. | Observe diagnostic LED flash code. Check for gas supply. Verify ignitor glows. Call for service if lockout occurs. |
| Furnace short cycles (turns on/off frequently) | Dirty filter, restricted airflow, high limit switch tripping. | Replace air filter. Check for blocked vents/registers. Ensure blower speed is set correctly. |
| Unusual noises (banging, rumbling, squealing) | Dirty burners, loose components, inducer or blower motor issues. | Turn off furnace. Have technician inspect and clean burners, tighten mounting hardware, check motors. |
| Diagnostic LED flashing a code | Internal fault detected by control board. | Count the number of flashes, then refer to the fault code chart on the inside of the access panel or installation manual. |
| Condensate drain leaking or clogged | Algae growth, improper trap installation, frozen drain line. | Clean trap and drain line with approved cleaner. Ensure trap is properly primed and line is pitched to drain. Insulate if in cold space. |
Reset Procedure: If the control board is in lockout (LED flashing a code), turn off power to the furnace at the disconnect or breaker for 30 seconds, then restore power. The furnace will attempt to restart. If the problem persists, call for service.
Service: For all repairs not covered in this guide, contact a qualified HVAC technician. American Standard dealer locator: www.americanstandardair.com or 1-800-526-2200.