American Standard HVAC YSC120E Manual

The American Standard YSC120E is a high-efficiency, single-stage, scroll compressor condensing unit designed for residential and light commercial applications. It features a durable, weather-resistant cabinet, low-sound operation, and compatibility with American Standard matched indoor units for optimal performance. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Weather-resistant galvanized steel cabinet, Scroll compressor, Single-stage operation, High-efficiency coil, Low-sound fan, Service valves, Electrical connections.

Installation

Unpack and inspect contents. Place on stable, level pad.

1. Select Location: Choose a level, stable outdoor location with adequate airflow and clearance.
2. Set Pad: Place on a concrete pad or approved composite stand.
3. Connect Refrigerant Lines: Braze lines to service valves using nitrogen purge.
4. Connect Electrical: Run power and control wiring from disconnect to unit terminal block.
5. Connect Drain Line: Ensure condensate drain is properly routed from indoor unit.

WARNING! Installation must be performed by a qualified HVAC technician. Follow all local codes and manufacturer instructions. Disconnect all power before servicing.

First-Time Setup

After installation, perform initial startup and checks.

1. Leak Check: Evacuate system and check for refrigerant leaks.
2. Charge System: Weigh in correct refrigerant charge per data plate and line length.
3. Electrical Check: Verify correct voltage at unit and proper amp draw.
4. Start Unit: Energize system and check operation in cooling mode.
5. Verify Settings: Check thermostat settings and system response.

CAUTION! Ensure all electrical connections are tight and refrigerant lines are properly insulated. Record initial operating pressures and temperatures.

Specifications

• Model: YSC120E
• Cooling Capacity: 120,000 BTU/H (10 Ton)
• Refrigerant: R-410A
• Electrical: 208-230V, 60Hz, 1 Phase
• Compressor: Scroll, single-stage
• Fan Motor: Permanent Split Capacitor (PSC)
• Operating Ambient: 55°F to 115°F
• Sound Level: Low as per AHRI standards
• Dimensions: Refer to unit data plate
• Net Weight: Approximately 310 lbs

Controls and Settings

Primary control is via connected thermostat. Unit includes internal safety controls.

Thermostat: Controls system mode (Cool, Off), temperature setpoint, and fan operation (Auto, On).

Unit Controls: High-pressure switch, Low-pressure switch, Compressor overload, Fan delay on/off. No user-adjustable settings on outdoor unit; all adjustments made via thermostat or indoor unit controls.

Connecting Components

Connect to matched indoor unit (air handler or furnace), thermostat, and power supply.

1. Turn off all power at disconnect and indoor unit.
2. Connect Refrigerant Lines: Liquid and suction lines to corresponding service valves.
3. Connect Control Wiring: Typically 2-5 wires (R, C, Y, O/B, G) between thermostat, indoor unit, and outdoor unit.
4. Connect Power Wiring: From disconnect to unit terminal block (L1, L2).
5. Connect Drain Line: From indoor unit condensate pan to suitable drain.

Tip: Refer to wiring diagram on unit panel for specific connections. Use copper conductors only.

Operation

Unit operates based on thermostat demand.

1. Cooling Cycle: Thermostat calls for cooling, energizing compressor and outdoor fan.
2. Normal Operation: Listen for smooth compressor and fan operation.
3. Cycle Off: Thermostat satisfied, compressor and fan de-energize.
4. Fan Delay: Outdoor fan may run briefly after compressor shuts off.

WARNING! Do not operate unit if unusual noises, vibrations, or refrigerant leaks are detected. Shut off power and contact a qualified technician.

Maintenance

Regular maintenance ensures efficiency and longevity. Perform at least annually.

1. Inspect Coils: Clean outdoor coil of debris, leaves, and dirt.
2. Check Refrigerant Charge: Verify proper subcooling/superheat.
3. Inspect Electrical: Tighten connections, check contactor and capacitor.
4. Check Fan Motor: Lubricate if required (check specifications).
5. Inspect Mounting: Ensure unit is level and stable.

CAUTION! Always disconnect power before performing any maintenance. Wear appropriate personal protective equipment.

Care & Cleaning

Keep unit clear of obstructions and clean.

Outdoor Coil: Gently clean with a soft brush or low-pressure water spray. Do not use high-pressure washers. Cabinet: Wipe with a damp cloth if needed. Area: Maintain 24-inch minimum clearance on all sides, especially top.

CAUTION! Do not use harsh chemicals or abrasive cleaners. Do not bend coil fins.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The YSC120E uses R-410A refrigerant, which must be recovered and reclaimed by EPA-certified technicians. Manufactured by American Standard Heating & Air Conditioning. For support, contact your local American Standard dealer or visit www.americanstandardair.com.

Troubleshooting

Reset: Some faults may auto-reset. For persistent issues, power cycle unit at disconnect.

Service: Contact a qualified American Standard dealer. Do not attempt repairs beyond basic maintenance without proper training.