Carrier Weathermaker 8000 Gas Furnace Manual

The Carrier Weathermaker 8000 is a high-efficiency gas furnace designed for residential heating applications. This model features advanced combustion technology, variable-speed blower motor, electronic ignition, and multiple safety systems. Below are key sections covering safety, installation, operation, maintenance, troubleshooting, and technical specifications.

1. Safety Information 2. Installation Requirements 3. Operating Instructions 4. Technical Specifications 5. Control System 6. Venting System 7. Maintenance Procedures 8. Error Codes 9. Parts List 10. Warranty Information 11. Troubleshooting Guide

Safety Information

Critical safety warnings and precautions for proper furnace operation.

Warning Type	Description
Gas Leaks	If you smell gas, immediately evacuate and call gas company
Carbon Monoxide	Install CO detectors near sleeping areas
Electrical Shock	Disconnect power before servicing
Burn Hazard	Surfaces may be hot during operation
Combustion Air	Ensure adequate ventilation for proper combustion
Clearance	Maintain minimum clearances from combustible materials

Installation Requirements

Proper installation guidelines for safe and efficient operation.

Location: Install in dry, well-ventilated area with adequate clearance.
Gas Connection: Use approved gas piping materials; pressure test for leaks.
Electrical: Connect to dedicated 120V circuit with proper grounding.
Venting: Install PVC vent pipes according to local codes and manufacturer specifications.
Drainage: Connect condensate drain line to proper drainage system.

WARNING! Installation must be performed by qualified HVAC technician only.

Operating Instructions

Proper startup and shutdown procedures for daily operation.

Startup: Set thermostat to desired temperature; furnace will ignite automatically.
Normal Operation: Variable-speed blower adjusts airflow for optimal comfort.
Shutdown: Set thermostat below room temperature to turn off furnace.
Seasonal Startup: Verify proper operation before heating season.

CAUTION! Do not attempt to manually override safety controls.

Technical Specifications

Model: Weathermaker 8000 Gas Furnace
Input Capacity: 60,000 - 120,000 BTU/h
Efficiency: 95% AFUE
Gas Type: Natural Gas (convertible to LP)
Electrical: 120V, 60Hz, 5A
Blower Motor: Variable-speed ECM
Venting: PVC (2" minimum)
Dimensions: Varies by model size
Weight: 120-180 lbs

Control System

Integrated furnace control board with diagnostic capabilities.

Control Board: Features LED status lights, diagnostic codes, and safety lockouts.

Thermostat Connections: R (24V), W (Heat), G (Fan), C (Common). Ignition System: Hot surface igniter with flame sensor. Blower Control: Variable-speed operation with timed delays. Safety Devices: Limit switches, pressure switches, rollout switches.

Venting System

PVC venting requirements for high-efficiency operation.

Vent Pipe: Schedule 40 PVC, minimum 2" diameter.
Termination: Maintain proper clearances from windows, doors, and air intakes.
Slope: Pitch vent pipes toward furnace for condensate drainage.
Supports: Secure vent pipes every 4 feet.

Tip: Check vent pipes annually for obstructions or damage.

Maintenance Procedures

Regular maintenance schedule for optimal performance.

Monthly: Check air filter; replace if dirty.
Seasonal: Inspect burners, heat exchanger, and vent system.
Annual: Professional inspection and cleaning.
Blower Maintenance: Clean blower wheel and housing annually.
Drain System: Flush condensate trap and drain line.
Combustion Analysis: Verify proper gas pressure and combustion.

WARNING! Only qualified technicians should perform internal maintenance.

Error Codes

Diagnostic flash codes for troubleshooting.

Flash Code	Description	Action
1 Flash	Pressure switch stuck open	Check venting and pressure switch
2 Flashes	Ignition failure	Check gas supply and igniter
3 Flashes	Limit circuit fault	Check airflow and filters
4 Flashes	Pressure switch stuck closed	Check inducer motor and tubing
5 Flashes	Flame rollout	Check burners and heat exchanger

Parts List

Common replacement parts for Weathermaker 8000 series.

Control Board: HK42FZ011
Igniter: 25L56
Flame Sensor: 50A55-843
Inducer Motor: 46T1007
Blower Motor: 48TMD0002
Gas Valve: 36J56
Limit Switch: 39M46
Filter Size: 16x25x1 (standard)

Warranty Information

Limited warranty coverage for components.

Heat Exchanger: 20-year limited warranty. Parts: 5-year limited warranty. Labor: 1-year from installation date. Registration: Complete warranty registration within 90 days of installation. For warranty service, contact authorized Carrier dealer with proof of purchase.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat setting, door switch engagement
No heat	Gas supply, igniter, filter	Verify gas valve on, check igniter, replace dirty filter
Short cycling	Dirty filter, limit switch	Replace filter, check airflow, verify limit switch operation
Blower won't stop	Thermostat, control board	Check thermostat fan setting, test control board
Unusual noises	Motor, blower wheel, ducts	Inspect blower assembly, check for loose components

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

Service: Contact authorized Carrier dealer at 1-800-CARRIER or visit www.carrier.com