dmo industries olsen gas furnace manuals

The DMO Industries Olsen Gas Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. Available in various models with AFUE ratings up to 96%, these furnaces feature variable-speed blowers, electronic ignition systems, durable heat exchangers, and comprehensive safety controls. Below are key sections covering safety guidelines, installation procedures, operation instructions, maintenance schedules, troubleshooting, and technical specifications.

Features at a Glance

Key components: High-efficiency heat exchanger, variable-speed ECM blower motor, electronic hot surface ignition, multi-speed inducer motor, integrated control board, flame sensor, pressure switches, and diagnostic LED system.

Installation Guidelines

Professional installation recommended. Unpack and inspect all components before beginning.

1. Location selection: Choose well-ventilated area with proper clearances (minimum 1 inch from combustible materials).
2. Gas connection: Use black iron pipe with proper thread sealant; pressure test for leaks.
3. Electrical wiring: Connect 120V power supply with proper grounding; install disconnect switch within sight.
4. Venting installation: Install PVC vent pipes according to local codes and manufacturer specifications.
5. Drain line: Connect condensate drain line to proper drainage system.
6. Ductwork: Ensure proper return and supply duct sizing and sealing.

WARNING! Gas furnaces produce carbon monoxide. Proper installation and venting are critical for safety. Only qualified technicians should perform installation.

First-Time Setup

Complete system commissioning after installation.

1. Gas pressure adjustment: Verify and adjust manifold pressure to specifications (typically 3.5" WC for natural gas).
2. Blower speed settings: Set appropriate speeds for heating mode based on duct static pressure.
3. Thermostat configuration: Connect compatible thermostat and configure for gas furnace operation.
4. System testing: Perform complete operational test including safety device verification.
5. Customer orientation: Demonstrate basic operation and maintenance procedures.

CAUTION! Always verify proper combustion and venting before leaving installation. Test all safety controls.

Technical Specifications

• Models Available: OLS-40, OLS-60, OLS-80, OLS-100 (40,000-100,000 BTU)
• AFUE Rating: Up to 96%
• Fuel Type: Natural Gas (convertible to LP with kit)
• Electrical: 120V/60Hz/1Ph, 3-8 amps depending on model
• Blower Motor: Variable-speed ECM, ½ to ¾ HP
• Venting: 2" or 3" PVC depending on model and installation
• Gas Connection: ½" NPT
• Operating Temp Range: -30°F to 120°F ambient
• Sound Rating: As low as 65 dB on low stage
• Warranty: Lifetime heat exchanger, 10 years parts

Controls and Settings

Integrated control board with LED diagnostic indicators. Access door switch for safety interlock.

Control Board Features: Status LED (flashing codes for diagnostics), dip switches for configuration, terminal strip for thermostat connections.

Thermostat Connections: R (24V power), C (common), W (heat), G (fan), Y (cooling if equipped). Configuration: Blower off delay adjustment, fan control selection, heating capacity staging. Diagnostic Codes: LED flash patterns indicate specific fault conditions (1 flash = pressure switch, 2 flashes = ignition failure, etc.).

Venting Requirements

Category IV venting system required. PVC pipe materials acceptable.

1. Vent pipe sizing: Minimum 2" diameter for models up to 80,000 BTU; 3" for larger models.
2. Termination clearances: 12" from operable windows, 3' from gas meters, 1' above grade/snow line.
3. Pipe support: Support every 3 feet horizontally, secure joints with PVC cement.
4. Condensate drainage: Pitch vent pipes back toward furnace ¼" per foot.

Tip: Always follow local building codes and manufacturer venting tables for specific installations.

Operating Instructions

Normal operation through connected thermostat.

1. Start sequence: Thermostat calls for heat, inducer motor starts, pressure switch proves draft.
2. Ignition sequence: Hot surface igniter glows, gas valve opens, burner ignition verified.
3. Main operation: Blower starts after heat exchanger warm-up delay, runs until thermostat satisfied.
4. Shutdown sequence: Gas valve closes, inducer continues for post-purge, blower runs for cool-down.
5. Fan operation: Can be set to AUTO or ON continuous at thermostat.

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

Maintenance Procedures

Annual professional maintenance recommended. Monthly filter changes during heating season.

1. Filter replacement: Turn off power, remove old filter, insert new filter with arrow pointing toward blower.
2. Visual inspection: Check for soot, corrosion, or debris in burners and heat exchanger.
3. Cleaning: Vacuum burners, blower compartment, and flame sensor with soft brush.
4. Testing: Verify gas pressure, temperature rise, and safety control operation.
5. Lubrication: Most models have permanently lubricated bearings; verify manufacturer specifications.

CAUTION! Always turn off electrical power and gas supply before performing any maintenance.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for US and Canadian safety standards. UL listed components. Energy Star® qualified on certain models. Meets DOE energy conservation standards. For technical support, contact DMO Industries at 1-800-555-HEAT or visit www.dmoindustries.com. Installation must comply with National Fuel Gas Code (NFPA 54) and local building codes.

Troubleshooting Guide

Reset Procedure: Turn thermostat to OFF, turn off power at disconnect for 30 seconds, restore power, set thermostat to HEAT.

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