Ruud Gas Furnace Installation Manual

The Ruud Gas Furnace is a high-efficiency heating system designed for residential applications, featuring advanced combustion technology, variable-speed blower motors, and multiple safety controls. This manual covers proper installation procedures, safety requirements, electrical connections, gas line connections, venting systems, startup procedures, and maintenance guidelines for optimal performance and safety compliance.

1. Safety Precautions 2. Pre-Installation Requirements 3. Unit Specifications 4. Installation Location 5. Gas Supply Connection 6. Electrical Wiring 7. Venting System 8. Ductwork Connection 9. Startup Procedure 10. Commissioning & Testing 11. Troubleshooting

Safety Precautions

Critical safety information for proper furnace installation and operation.

Hazard	Precaution
Gas Leaks	Check all connections with leak detection solution
Carbon Monoxide	Ensure proper venting and combustion air supply
Electrical Shock	Disconnect power before servicing
Fire Hazard	Maintain proper clearances from combustible materials
Burn Risk	Allow unit to cool before handling components

Pre-Installation Requirements

Essential preparations before beginning furnace installation.

Verify local codes and obtain necessary permits
Check furnace model matches job requirements
Inspect unit for shipping damage
Ensure adequate workspace and clearance
Gather required tools and materials

WARNING! Installation must comply with all local building codes and NFPA 54/ANSI Z223.1 standards.

Unit Specifications

Input Capacity: 40,000 - 120,000 BTU/hr
Efficiency Rating: 80% - 96% AFUE
Gas Type: Natural Gas or LP (conversion kit required)
Electrical: 120V, 60Hz, 1.5-3.0 Amps
Venting: Category I or IV (depending on model)
Dimensions: Varies by model (check specific unit)
Weight: 80-150 lbs
Operating Temp Range: -30°F to 120°F

Installation Location

Proper furnace placement is critical for safety and performance.

Indoor location only - protected from weather
Minimum 24" front clearance for service access
6" clearance from combustible materials
Adequate combustion air supply required
Level, solid foundation necessary

CAUTION! Do not install in areas containing corrosive chemicals or flammable vapors.

Gas Supply Connection

Proper gas line installation procedures.

Shut off main gas supply
Install sediment trap upstream of gas valve
Use approved pipe thread compound or tape
Pressure test at 14" W.C. for 10 minutes
Check for leaks with approved detection solution

WARNING! Gas piping must be sized according to NFPA 54. Maximum inlet pressure 14" W.C.

Electrical Wiring

Electrical connection requirements and procedures.

Connection	Specification
Line Voltage	120V, 15A dedicated circuit
Thermostat	24V, 18-22 gauge wire
Grounding	Proper equipment grounding required
Disconnect	Service disconnect within sight of unit
Blower Motor	Variable speed ECM motor

Venting System

Vent pipe installation guidelines.

Use only approved vent materials
Maintain proper slope (1/4" per foot)
Secure joints with screws or approved methods
Install condensate drain per local codes
Verify adequate draft during startup

CAUTION! Vent system must terminate at approved location away from windows and air intakes.

Ductwork Connection

Proper duct system connection procedures.

Size ducts according to Manual J calculation
Seal all joints with approved mastic
Install filter rack with proper size filter
Provide adequate return air capacity
Balance system for proper airflow

Tip: Measure static pressure to verify proper duct sizing.

Startup Procedure

Step-by-step furnace startup and verification.

Verify all connections are secure
Open main gas shutoff valve
Restore electrical power
Set thermostat to heat mode
Observe ignition sequence
Check gas pressure adjustments
Verify proper flame characteristics
Measure temperature rise

WARNING! Never bypass safety controls during startup. Follow manufacturer's sequence exactly.

Commissioning & Testing

Final verification and system testing.

Combustion analysis: CO levels below 100 ppm
Temperature rise: Within manufacturer's range
Gas pressure: Within specified range
Airflow: CFM matches design requirements
Safety controls: All functions properly
Cycle completion: Full heat cycle verification

Troubleshooting

Symptom	Possible Cause	Corrective Action
No ignition	Gas supply, igniter, pressure switch	Check gas valve, replace igniter, verify pressure switch operation
Short cycling	Dirty filter, airflow restriction	Replace filter, check ductwork, verify proper airflow
Blower not running	Motor, capacitor, control board	Check voltage to motor, test capacitor, inspect control board
Lockout condition	Flame sensor, gas valve	Clean flame sensor, check gas valve operation
Excessive noise	Blower wheel, motor bearings	Inspect blower wheel balance, lubricate or replace motor

Reset: Power cycle unit to clear lockout conditions.

Service: Contact authorized Ruud dealer for technical support and warranty service.