Airtemp Furnace Manual

The Airtemp Furnace is a high-efficiency heating system designed for residential and light commercial use, featuring advanced combustion technology, variable-speed blower motor, electronic ignition, multi-speed operation, built-in diagnostics, and energy-saving modes. Compatible with standard thermostat systems and available in various BTU capacities. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, electronic control board, filter compartment, vent system, and safety switches.

Feature	Description
Heat Exchanger	Stainless steel construction for efficient heat transfer
Blower Motor	Variable-speed ECM motor for quiet operation
Gas Valve	Precise gas flow control with safety shutoff
Control Board	Microprocessor-based with diagnostic LEDs
Filter Compartment	Standard 1-inch or 4-inch media filter compatible
Vent System	PVC venting for high-efficiency operation
Safety Switches	Pressure switch, rollout switch, limit switch
Ignition System	Hot surface igniter for reliable startup
Thermostat Connection	Standard 24VAC thermostat terminals
Service Ports	Pressure test ports for service diagnostics

Installation

Unpack and inspect all components. Ensure proper clearances and venting requirements.

1. Position furnace: Place on level surface with proper clearances (minimum 1" sides, 6" front).
2. Install vent pipes: Connect PVC vent and intake pipes according to local codes.
3. Connect gas line: Use approved gas piping with sediment trap.
4. Electrical connections: Connect 120V power and thermostat wiring.
5. Install filter: Insert appropriate size air filter.

WARNING! Gas appliances can be hazardous; installation must be performed by qualified technician. Ensure proper ventilation and combustion air supply.

First-Time Setup

After installation, perform initial startup and system check.

1. Power on furnace: Turn on electrical power and gas supply.
2. Set thermostat: Program thermostat for desired temperature settings.
3. Test operation: Initiate heating cycle and verify proper operation.
4. Check airflow: Ensure adequate airflow from all registers.
5. Verify safety controls: Test limit switches and pressure switches.

CAUTION! Never bypass safety controls. If furnace fails to start properly, shut off power and gas immediately.

Specifications

• Heating Capacity: 40,000 - 120,000 BTU/hr models available
• Efficiency Rating: 80% - 96% AFUE depending on model
• Blower Motor: Variable-speed ECM, 1/3 - 1/2 HP
• Electrical: 120V AC, 60Hz, 15 amp circuit
• Gas Type: Natural gas or LP/propane (conversion kit required)
• Venting: PVC or ABS plastic (2" - 3" diameter)
• Filter Size: 16x25x1 standard or 16x25x4 media
• Sound Level: < 65 dB during operation
• Warranty: 10-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. LED indicators show system status and error codes.

Control Board: POWER switch, FAN switch (ON/AUTO), diagnostic LEDs, reset button.

Operating Modes: HEAT, COOL (with AC), FAN ONLY. Temperature Control: Via thermostat settings. Blower Speeds: Multiple speeds for heating and cooling modes. Diagnostic Codes: Flashing LED patterns indicate specific fault conditions. Safety Reset: Manual reset button for lockout conditions.

Connecting Thermostat

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

1. Turn off power to furnace before wiring.
2. Connect thermostat wires to control board terminals.
3. Match wire colors: R (24V), W (Heat), Y (Cool), G (Fan), C (Common).
4. Program thermostat for furnace operation.

Tip: Use programmable thermostat for maximum energy efficiency and comfort.

Operating Modes

Supports heating, fan-only, and with AC unit - cooling operation.

1. Heating Mode: Thermostat calls for heat, igniter glows, gas valve opens, blower starts after warm-up delay.
2. Fan Mode: Continuous or intermittent blower operation for air circulation.
3. Cooling Mode: With AC unit, provides air conditioning when thermostat calls for cool.
4. Multi-stage Operation: Modulating gas valve and variable blower for precise temperature control.
5. Standby Mode: System ready for thermostat demand.

WARNING! Never operate furnace without proper venting and combustion air. Ensure filters are clean for proper airflow.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Frequency	Maintenance Task
Monthly	Check and replace air filter if dirty
Seasonal	Inspect vent system for obstructions
Annual	Professional inspection and cleaning
Annual	Check heat exchanger for cracks
Annual	Verify gas pressure and combustion
Annual	Lubricate blower motor if required

Care & Cleaning

Turn off power before any cleaning. Use soft brush and vacuum for dust removal.

CAUTION! Never use water or liquid cleaners on electrical components. Keep combustion area clear of debris.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas appliances. Meets DOE energy efficiency requirements. Copyright © Airtemp Heating & Cooling. For technical support, visit www.airtemp.com or contact 1-800-AIRTEMP.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety switch	Check power supply; verify thermostat setting; reset safety switches.
No heat	Gas supply, igniter, gas valve	Ensure gas valve open; check igniter; verify gas pressure.
Blower not running	Motor, capacitor, control board	Check motor operation; test capacitor; verify control signals.
Furnace short cycles	Filter, airflow, limit switch	Replace dirty filter; check for blocked vents; test limit switch.
Unusual noises	Blower, motor bearings, ductwork	Inspect blower wheel; check motor bearings; examine duct connections.

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

Service: 1-800-AIRTEMP; www.airtemp.com