Intertherm Propane Furnace Manual

The Intertherm Propane Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, multiple safety controls, energy-efficient operation, and compatibility with standard thermostat systems. Below are key sections for safety, features, installation, 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. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Propane burner assembly, heat exchanger, blower motor, gas valve, ignition system, safety controls, thermostat connections.

Feature	Description
Propane Burner	High-efficiency stainless steel burner
Heat Exchanger	Durable aluminized steel construction
Blower Motor	Variable speed for optimal airflow
Gas Valve	Precise propane flow regulation
Ignition System	Electronic ignition for reliable start
Safety Controls	Flame sensor, limit switches, pressure switches
Thermostat Connections	Standard 24VAC compatibility
Air Filter	Standard 1-inch filter slot
Vent System	PVC venting for high-efficiency operation
Drain Connection	Condensate removal system

Installation

Unpack and inspect all components. Ensure proper clearances and ventilation.

Location: Install in well-ventilated area with proper clearances to combustible materials.
Gas Connection: Use approved propane gas line with proper sizing and shut-off valve.
Venting: Install PVC vent pipes according to manufacturer specifications.
Electrical: Connect to 120V AC power supply with proper grounding.
Thermostat: Wire compatible thermostat to control board.

WARNING! Installation must be performed by qualified technician. Propane gas is flammable and dangerous if handled improperly.

First-Time Setup

Complete installation verification before initial startup.

Gas Pressure Check: Verify propane supply pressure and adjust gas valve if necessary.
Vent System: Ensure proper vent installation and clearances.
Electrical: Check all wiring connections and voltage.
Startup: Follow lighting instructions for initial ignition.
Operation Check: Verify proper heating cycle and temperature rise.

CAUTION! Perform combustion analysis to ensure proper operation and efficiency.

Specifications

Fuel Type: Propane (LP Gas)
Input BTU/H: 40,000 - 120,000 (varies by model)
Efficiency: 90%+ AFUE
Electrical: 120V AC, 60Hz
Blower Motor: Variable Speed ECM
Vent Size: 2" or 3" PVC (model dependent)
Gas Connection: 1/2" NPT
Operating Pressure: 11" WC propane
Temperature Rise: 35-65°F
Warranty: Limited lifetime heat exchanger

Controls and Settings

Integrated control board manages all furnace operations with diagnostic LED indicators.

Control Board: Monitors safety devices, controls ignition sequence, manages blower operation.

Settings: Blower delay adjustments, temperature rise verification, diagnostic mode access. LED Codes: Flash patterns indicate specific error conditions for troubleshooting.

Connecting Thermostat

Standard 24VAC thermostat connection with R, W, G, C terminals.

Turn off power to furnace before wiring.
Connect thermostat wires to control board terminals.
Standard wiring: R (24V), W (Heat), G (Fan), C (Common).
Verify proper thermostat operation after connection.

Tip: Use thermostat compatible with propane furnace systems for optimal performance.

Operating Procedures

Normal operation controlled by thermostat. System includes automatic safety checks.

Startup: Thermostat calls for heat, control board initiates pre-purge cycle.
Ignition: Hot surface igniter heats, gas valve opens, flame sensor verifies ignition.
Heating: Burner operates, heat exchanger warms, blower activates after delay.
Shutdown: Thermostat satisfied, gas valve closes, blower continues for post-purge.
Safety: Continuous monitoring of flame, temperature, and pressure conditions.

WARNING! Never bypass safety controls. Regular professional maintenance required.

Safety Features

Multiple safety systems ensure safe operation: Flame rollout switches, high limit switches, pressure switches, flame sensor, ignition control lockout.

Maintenance & Cleaning

Regular maintenance essential for safe and efficient operation.

Monthly: Check and replace air filter as needed.
Annual: Professional inspection and cleaning of burners, heat exchanger, vent system.
Seasonal: Verify proper operation before heating season.

CAUTION! Turn off gas and electrical power before any maintenance. Only qualified technicians should service gas components.

Regulatory Information

ANSI Z21.47: Certified for safe operation. CSA International approved. UL listed components. For support, contact Intertherm customer service or authorized dealers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety lockout	Check power supply, thermostat settings, reset safety switches.
No heat	Gas supply, ignition failure	Verify propane supply, check igniter and flame sensor.
Short cycling	Dirty filter, blocked vent	Replace air filter, check vent system for obstructions.
Blower not working	Motor, capacitor, control board	Check blower motor operation, capacitor, control board signals.
Error codes flashing	Various safety trips	Refer to LED flash code chart in service manual.

Reset: Power cycle furnace to clear temporary lockouts.

Service: Contact qualified HVAC technician for all gas-related repairs.