Duomatic Olsen Gas Furnace Manual

The Duomatic Olsen Gas Furnace is a high-efficiency residential heating system featuring natural gas operation, electronic ignition, multi-speed blower, safety shut-off controls, programmable thermostat compatibility, and energy-saving operation modes. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operation Modes 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Gas valve assembly, heat exchanger, blower motor, electronic ignition system, safety controls, thermostat connections.

Feature	Description
Gas valve	Controls natural gas flow to burner assembly
Heat exchanger	Stainless steel construction for efficient heat transfer
Blower motor	Multi-speed for optimal air circulation
Electronic ignition	Pilotless ignition for energy efficiency
Safety controls	Automatic shut-off for overheat protection
Thermostat connections	Compatible with programmable thermostats
Filter access	Easy-access panel for filter replacement
Pressure switch	Ensures proper venting operation
Flame sensor	Monitors burner flame status
Limit switch	Prevents overheating conditions

Installation

Unpack and inspect contents. Ensure proper location with adequate clearance.

Gas connection: Use approved gas piping; apply pipe joint compound on male threads only.
Vent system: Install proper vent piping according to local codes and manufacturer specifications.
Electrical connection: Connect to 120V AC power supply with proper grounding.
Thermostat wiring: Connect thermostat wires to appropriate terminals.
Ductwork: Ensure proper duct connections for supply and return air.

WARNING! Installation must be performed by qualified technician. Gas leaks can cause explosion. Follow all local codes.

First-Time Setup

Power on furnace; follow startup sequence.

Gas pressure check: Verify proper gas pressure at manifold.
Vent verification: Ensure proper draft and venting operation.
Blower speed: Set appropriate blower speed for heating requirements.
Thermostat programming: Set desired temperature schedules.
System test: Run complete heating cycle to verify operation.

CAUTION! Do not attempt startup without proper gas pressure verification. Carbon monoxide hazard exists if improperly installed.

Specifications

Heating Capacity: 60,000 - 120,000 BTU/h (model dependent)
Fuel Type: Natural Gas
Efficiency: 80% - 96% AFUE
Electrical: 120V AC, 60Hz
Blower Motor: Multi-speed PSC or ECM
Vent Size: 3" - 5" PVC (category IV) or metal (category I)
Gas Connection: 1/2" - 3/4" NPT
Operating Temp Range: -30°F to 120°F ambient
Dimensions: Varies by model (typical: 48"H x 21"W x 26"D)

Controls and Settings

Access control board via front service panel. Integrated control module with status LED indicators.

Control Board: POWER, STATUS LED, DIAGNOSTIC codes, DIP switch settings for blower speed and timing.

Thermostat Settings: HEAT/COOL/OFF mode, FAN AUTO/ON, temperature setpoints. Blower Settings: Heating speed, cooling speed (if applicable), continuous fan operation. Safety Controls: High limit switch, pressure switch, flame rollout switch, flame sensor. Diagnostic Codes: LED flash patterns for troubleshooting.

Connecting Thermostat

Standard 5-wire thermostat connection: R (24V power), W (heat), G (fan), Y (cool), C (common).

Turn off power to furnace before wiring.
Strip thermostat wires 1/4 inch.
Connect wires to corresponding terminals on control board.
Program thermostat for heating operation.
Restore power and test system operation.

Tip: Use color-coded thermostat wire for easy identification. Ensure proper polarity for C wire connection.

Operation Modes

Supports standard heating operation with optional continuous fan mode.

Heating Mode: Thermostat calls for heat, ignition sequence begins.
Ignition Sequence: Inducer motor starts, pressure switch proves, hot surface igniter glows.
Burner Operation: Gas valve opens, burner ignites, flame sensor confirms.
Blower Operation: Blower starts after heat exchanger warm-up delay.
Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down.
Continuous Fan: Optional fan-only operation for air circulation.

WARNING! Never operate furnace with access panels removed. Keep combustible materials away from furnace.

Maintenance Procedures

Annual maintenance recommended for optimal performance and safety.

Filter replacement: Replace air filter every 1-3 months.
Blower cleaning: Vacuum blower assembly and motor.
Heat exchanger inspection: Check for cracks or corrosion.
Burner cleaning: Remove and clean burner assembly.
Flame sensor cleaning: Gently clean with emery cloth.
Vent system inspection: Check for obstructions or damage.

CAUTION! Disconnect power and gas supply before performing maintenance.

Care & Cleaning

Regular cleaning maintains efficiency and extends furnace life.

Exterior: Wipe with damp cloth. Air filter: Replace regularly. Blower compartment: Vacuum annually. Burners: Clean with soft brush. Drain system: Flush condensate drain (high-efficiency models).

CAUTION! Do not use water or cleaning solutions on electrical components. Keep area around furnace clear and dry.

Regulatory Information

ANSI Z21.47: Certified for natural gas operation. UL 795: Commercial-Industrial Gas Equipment standard. CSA International: Certified for safety standards. For support, visit www.duomaticolsen.com or contact 1-800-555-HEAT. Installation must comply with National Fuel Gas Code NFPA 54 and local building codes.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, gas supply	Check circuit breaker, thermostat settings, gas valve position.
No heat	Ignition failure, gas valve	Check for spark/flame, verify gas supply, clean flame sensor.
Short cycling	Dirty filter, limit switch	Replace air filter, check for restricted airflow.
Blower not working	Motor, capacitor, control	Check blower motor, capacitor, control board signals.
Strange odors	Dust buildup, gas leak	Clean components, check for gas leaks (evacuate if suspected).
Error codes flashing	System faults	Refer to diagnostic code chart in service manual.

Reset: Power cycle furnace by turning off power for 30 seconds then restoring.

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