Ruud Silhouette 2 Gas Furnace Manual

The Ruud Silhouette 2 is a high-efficiency gas furnace featuring advanced combustion technology, variable-speed blower motor, electronic ignition system, multi-speed airflow control, built-in diagnostic system, quiet operation design, energy-efficient performance, and compatibility with most thermostats. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Variable-speed ECM blower motor, hot surface igniter, flame sensor, pressure switches, gas valve, heat exchanger, condensate drain system.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in clean, dry area with adequate combustion air and service clearance.
2. Venting: Use approved PVC pipe for intake and exhaust; maintain proper slope.
3. Gas connection: Use black iron pipe; test for leaks with soap solution.
4. Electrical: 120V AC power supply; proper grounding required.
5. Drain line: Install condensate drain with trap and neutralizer if required.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with all local codes.

First-Time Setup

Initial startup must be performed by qualified technician.

1. Verify installation: Check all connections, clearances, and venting.
2. Gas pressure: Adjust manifold pressure to specifications on rating plate.
3. Electrical: Connect thermostat; set system to heating mode.
4. Startup sequence: Power on; observe ignition sequence and flame.
5. Airflow: Adjust blower speed for proper temperature rise.
6. Combustion analysis: Verify CO levels and efficiency.

CAUTION! Never operate furnace without proper venting. Keep combustibles away from furnace.

Technical Specifications

• Input Capacity: 40,000 to 120,000 BTU/hr (model dependent)
• Efficiency: Up to 96% AFUE
• Gas Type: Natural gas (LP conversion kit available)
• Electrical: 120V AC, 60Hz, 5-15 amp circuit
• Blower Motor: Variable-speed ECM
• Airflow: 600-2000 CFM
• Venting: 2" PVC pipe (intake and exhaust)
• Sound Level: As low as 65 dBA
• Dimensions: Varies by model (typically 21"W x 21"D x 40"H)
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Integrated control board with diagnostic capabilities. Access via door removal.

Thermostat Connections: R (24V), C (Common), W (Heat), G (Fan), Y (Cool)

Control Board: POWER switch, diagnostic LED, dip switches for blower speed settings, pressure switch terminals, gas valve connector, igniter connections.

Blower Speeds: Adjustable for heating and cooling modes via dip switches. Temperature Rise: Must be within range on rating plate (typically 30-60°F).

Venting System

Direct vent system using PVC pipe for intake and exhaust.

1. Pipe material: Schedule 40 PVC, CPVC, or ABS
2. Maximum length: 100 feet equivalent (consult manual for specific model)
3. Minimum length: 5 feet each for intake and exhaust
4. Slope: 1/4" per foot back toward furnace
5. Terminations: Must be 12 inches above ground, 3 feet from openings

Tip: Install condensate drain trap and ensure proper drainage away from foundation.

Operating Instructions

Normal operation controlled by thermostat.

1. Set thermostat to desired temperature and HEAT mode.
2. Furnace will initiate startup sequence: inducer motor, pressure switch verification, igniter warm-up, gas valve opening.
3. Flame sensor confirms ignition; main blower starts after heat exchanger warm-up.
4. During operation: Variable-speed blower adjusts airflow for optimal comfort.
5. Shutdown: Gas valve closes, inducer continues for post-purge, blower runs for cool-down.

WARNING! If you smell gas, turn off gas supply immediately and call professional. Do not operate until leak is repaired.

Maintenance Procedures

Annual maintenance by qualified technician recommended.

Monthly: Check air filter; replace when dirty (typically 1-3 months).

Annual Professional Service: Clean heat exchanger, check burners, verify gas pressure, inspect vent system, test safety controls, check condensate system, lubricate motor if required.

CAUTION! Turn off power and gas before servicing. Only qualified personnel should perform internal maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

Regulatory Information

ANSI Z21.47: Certified for natural and propane gas operation. UL listed. Meets DOE energy efficiency standards. CSA design-certified. For technical support, contact Ruud at 1-800-722-2102 or visit www.ruud.com. Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and local codes.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore. If problem persists, call professional.

Service: 1-800-722-2102; www.ruud.com