Guardian Furnace Manual

The Guardian Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. This furnace features variable-speed blower technology, electronic ignition, multiple heat stages, smart thermostat compatibility, safety shut-off systems, and easy maintenance access. Rated for natural gas or propane operation with AFUE ratings up to 96%. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, ignition system, control board, filter compartment, venting system.

Feature	Description
Variable-speed blower	Adjusts airflow for optimal efficiency and comfort
Electronic ignition	Reliable spark ignition system (no standing pilot)
Multi-stage heating	Two-stage gas valve for precise temperature control
Smart thermostat ready	Compatible with most modern thermostat systems
Safety shut-off	Automatic gas shut-off if ignition fails
Filter access door	Easy-access panel for filter replacement
Pressure switch	Ensures proper venting before ignition
Flame sensor	Monitors burner operation for safety
Limit switch	Prevents overheating by shutting off burners
Drain system	Condensate removal for high-efficiency models

Installation Requirements

Professional installation recommended. Ensure proper clearances and venting.

1. Location: Install in well-ventilated area with required clearances (see specifications).
2. Gas connection: Use approved gas piping; pressure test before operation.
3. Electrical: Connect to dedicated 120V circuit; proper grounding required.
4. Venting: Install PVC vent pipes according to local codes and manufacturer specifications.
5. Combustion air: Ensure adequate fresh air supply for proper combustion.

WARNING! Gas appliances can be dangerous if improperly installed. Use licensed professional for installation.

First-Time Setup

Complete installation verification before initial startup.

1. Gas pressure check: Verify inlet and manifold pressures are within specifications.
2. Venting inspection: Ensure all vent connections are secure and properly sloped.
3. Electrical verification: Check wiring and thermostat connections.
4. Initial startup: Follow lighting instructions; observe first ignition cycle.
5. System check: Verify proper operation through complete heating cycle.

CAUTION! Never bypass safety controls. Test all safety features during initial setup.

Technical Specifications

• Input Capacity: 40,000-120,000 BTU/h (varies by model)
• AFUE Rating: Up to 96% efficiency
• Fuel Type: Natural gas or propane (conversion kit required)
• Electrical: 120V, 60Hz, 5-10 amps
• Blower Motor: ECM variable speed
• Stages: Single or two-stage heating
• Venting: PVC pipe (2-3 inch diameter)
• Sound Level: < 65 dB during operation
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board for system configuration and diagnostics.

Thermostat: HEAT/COOL/OFF mode, temperature setting, fan AUTO/ON, system programming.

Control Board: Status LED (flash codes for diagnostics), dip switches for blower speeds, gas valve settings, pressure switch terminals. System Settings: Blower delay, temperature differential, stage timing, filter reminder reset. Diagnostic: LED error codes indicate specific system faults for troubleshooting.

Venting and Combustion Air

Proper venting critical for safe operation and efficiency.

1. Vent piping: Use only approved PVC materials; maintain proper slope toward furnace.
2. Termination: Keep vent terminals clear of obstructions and away from windows/doors.
3. Combustion air: Ensure adequate fresh air supply per local codes.
4. Clearances: Maintain required distances from combustible materials.

Tip: Regularly inspect vent terminals for blockages from snow, leaves, or debris.

Operating Instructions

Normal operation through thermostat control.

1. Set thermostat to desired temperature in HEAT mode.
2. System will automatically cycle on when room temperature drops below set point.
3. Blower will start after warm-up delay; burners will ignite.
4. System runs until set temperature reached, then shuts off.
5. Fan may continue running briefly to extract residual heat.
6. For continuous fan operation, set thermostat fan switch to ON position.

WARNING! Never operate furnace with access panels removed. Keep area around furnace clear.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

1. Monthly: Check and replace air filter if dirty.
2. Seasonal: Inspect vent system for obstructions or damage.
3. Annual: Professional inspection of heat exchanger, burners, and safety controls.
4. Annual: Clean blower assembly and check motor operation.
5. Annual: Verify gas pressure and combustion analysis.

CAUTION! Turn off power and gas supply before performing any maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switch: Shuts off gas if flames extend outside burner area. High Limit Switch: Prevents overheating by shutting off burners. Pressure Switch: Ensures proper venting before ignition. Ignition Control: Automatic shut-off after several failed ignition attempts. Gas Valve: Automatic shut-off if flame not detected.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas furnace performance. Meets DOE energy efficiency requirements. CSA certified for Canadian installations. For technical support, visit www.guardianfurnace.com or contact 1-800-555-HEAT. Installation must comply with National Fuel Gas Code NFPA 54 and local building codes.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power/thermostat	Check circuit breaker; verify thermostat settings; replace batteries.
No heat	Gas supply/ignition	Verify gas valve on; check pilot/ignition; inspect filter.
Short cycling	Dirty filter/overheating	Replace air filter; check for blocked vents; verify airflow.
Blower won't stop	Thermostat setting	Check fan setting (AUTO/ON); inspect fan limit control.
Unusual noises	Mechanical issues	Inspect blower wheel; check for loose components; lubricate if needed.

Reset: Turn power off for 30 seconds, then restore. Check LED error codes.

Service: 1-800-555-HEAT; www.guardianfurnace.com