sears 867 furnace manual

The Sears 867 Furnace is a high-efficiency gas furnace designed for residential heating applications. This model features advanced combustion technology, electronic ignition, variable-speed blower motor, multiple heat stages, and comprehensive safety controls. Below are key sections covering safety guidelines, technical specifications, installation procedures, operation instructions, maintenance requirements, and troubleshooting guidance.

Safety Precautions

Critical safety information for proper furnace operation and maintenance.

Hazard	Precaution
Carbon Monoxide	Install CO detectors; ensure proper venting
Gas Leaks	Use leak detection solution; no open flames
Electrical Shock	Disconnect power before servicing
High Temperature	Allow unit to cool before maintenance
Combustible Materials	Maintain clearance per installation manual

WARNING! Only qualified technicians should perform installation and major repairs.

Technical Specifications

• Model: Sears 867 Furnace
• Fuel Type: Natural Gas
• Input Capacity: 60,000 - 100,000 BTU/h
• Efficiency: 92% AFUE
• Blower Motor: Variable Speed ECM
• Heat Stages: Two-stage operation
• Voltage: 120V AC, 60Hz
• Dimensions: Refer to unit data plate
• Venting: PVC pipe required

Installation Requirements

Proper installation ensures optimal performance and safety.

1. Location: Install in approved areas with adequate combustion air
2. Clearance: Maintain minimum clearances to combustible materials
3. Venting: Use approved PVC materials for intake and exhaust
4. Gas Line: Proper sizing and pressure testing required
5. Electrical: Follow local electrical codes and manufacturer wiring diagram
6. Drain Line: Proper condensate drainage system installation

CAUTION! Installation must comply with all local codes and regulations.

Operating Instructions

Standard operating procedures for the Sears 867 furnace.

1. Thermostat Setting: Set to desired temperature
2. System Switch: Set to HEAT mode
3. Fan Control: AUTO or ON position as needed
4. Startup Sequence: Allow 60-90 seconds for ignition sequence
5. Normal Operation: Monitor for consistent heating performance
6. Shutdown: Use thermostat to turn system off

NOTE: Initial startup may produce temporary odors from manufacturing residues.

Control Panel Features

Understanding the furnace control board and indicator lights.

Component	Function
Power Switch	Main electrical disconnect
Status LED	Flash codes for diagnostics
Gas Valve	Controls gas flow to burners
Ignition Control	Hot surface igniter operation
Limit Switches	Safety temperature controls
Pressure Switches	Verify proper venting operation

Maintenance Schedule

Regular maintenance ensures efficiency and extends furnace life.

• Monthly: Check air filter; replace if dirty
• Seasonal: Professional inspection before heating season
• Annual: Complete system cleaning and safety check
• As Needed: Clean flame sensor and burners
• Every 5 Years: Heat exchanger inspection

IMPORTANT: Keep maintenance records for warranty compliance.

Error Code Diagnostics

LED flash code interpretation for troubleshooting.

Flash Pattern	Description	Action
1 Flash	Ignition failure	Check gas supply and igniter
2 Flashes	Pressure switch error	Inspect venting and switches
3 Flashes	Limit circuit fault	Check airflow and filters
4 Flashes	Flame rollout	Emergency shutdown required
5 Flashes	Gas valve error	Professional service needed

Venting System

Proper venting installation and requirements.

1. Material: Use only approved PVC pipe
2. Slope: Minimum 1/4 inch per foot toward furnace
3. Termination: Follow manufacturer clearance requirements
4. Sealing: Use PVC cement on all joints
5. Support: Secure pipes every 4 feet

WARNING! Improper venting can cause carbon monoxide hazards.

Gas Line Connections

Gas supply requirements and connection procedures.

• Gas Pressure: 7 inches WC natural gas
• Pipe Size: Minimum 1/2 inch for most installations
• Shutoff Valve: Required within 6 feet of unit
• Drip Leg: Sediment trap mandatory
• Testing: Pressure test all connections

CAUTION! Gas line work must be performed by licensed professionals.

Electrical Wiring

Electrical connection specifications and requirements.

1. Power Supply: 120V AC, 15 amp circuit
2. Grounding: Proper equipment grounding required
3. Thermostat: Low voltage wiring (24V)
4. Conduit: Use approved electrical conduit
5. Disconnect: Install service disconnect within sight

NOTE: Follow National Electrical Code and local regulations.

Troubleshooting Guide

Common issues and solutions for the Sears 867 furnace.

Problem	Possible Cause	Solution
No heat	Thermostat setting, power, gas valve	Check settings, circuit breaker, gas supply
Short cycling	Dirty filter, blocked vents	Replace filter, clear obstructions
Blower not running	Motor, capacitor, control board	Check power to blower, capacitor condition
Unusual noises	Loose parts, airflow issues	Tighten components, check ductwork
Pilot/ignition issues	Gas supply, igniter, sensor	Verify gas pressure, clean flame sensor

Reset Procedure: Turn power off for 30 seconds, then restore.

Service Contact: Sears Technical Support 1-800-469-4663