amana 90 air command gas furnace manual

The Amana 90 Air Command Gas Furnace is a high-efficiency residential heating system with 90% AFUE rating, featuring variable-speed blower technology, electronic ignition, multi-speed operation, and advanced diagnostic controls. Designed for reliable performance in cold climates with safety features including flame rollout switch, pressure switch, and high-limit control. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Startup 4. Technical Specifications 5. Controls and Settings 6. Venting and Combustion Air 7. Operating Instructions 9. Maintenance Procedures 10. Regulatory Information 11. Troubleshooting Guide

Features at a Glance

Key components: Heat exchanger, variable-speed blower motor, electronic ignition system, gas valve, pressure switches, diagnostic LED, filter compartment.

Feature	Description
AFUE Rating	90% Annual Fuel Utilization Efficiency
Blower Motor	Variable-speed ECM for efficient operation
Ignition System	Hot surface electronic ignition
Heat Exchanger	Stainless steel primary and secondary
Gas Valve	Modulating for precise temperature control
Diagnostic LED	Flash codes for troubleshooting
Filter System	Standard 1-inch or 4-inch media filter
Safety Controls	Flame rollout switch, pressure switch, high-limit
Venting	PVC pipe compatible for sidewall or roof
Warranty	Limited lifetime heat exchanger warranty

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with adequate clearance and combustion air.
Gas connection: Use black iron pipe; test for leaks with soap solution.
Electrical: 120V AC, 60Hz dedicated circuit; proper grounding required.
Venting: PVC pipe system; maintain proper slope for condensation drainage.
Ductwork: Properly sized and sealed; ensure adequate return air.

WARNING! Gas furnaces produce carbon monoxide; improper installation can be fatal. Use certified HVAC technician.

First-Time Startup

Initial startup must be performed by qualified technician.

Verify installation: Check all connections, clearances, and venting.
Gas pressure: Adjust manifold pressure per specifications.
Electrical: Verify proper voltage and polarity.
Startup sequence: Follow manufacturer's startup procedure.
Combustion analysis: Verify proper CO levels and efficiency.
Customer orientation: Explain operation, filter changes, thermostat.

CAUTION! Never operate furnace without proper venting and combustion air supply.

Technical Specifications

Model Series: AMVC90
AFUE: 90%
Input BTU/H: 40,000 - 120,000 (varies by model)
Output BTU/H: 36,000 - 108,000 (varies by model)
Gas Type: Natural gas (LP conversion kit available)
Electrical: 115V/1Ph/60Hz, 5-12 amps
Blower Motor: ECM variable speed
Static Pressure: 0.1-0.9 in. w.c.
Venting: 2" - 3" PVC/CPVC
Sound Level: < 65 dBA
Dimensions: Varies by model (typical 21"W x 21"D x 45"H)

Controls and Settings

Integrated furnace control board with diagnostic capabilities. Thermostat controls operation.

Control Board: LED status light, dip switch settings, terminal connections.

Thermostat Settings: Heat/Cool/Off, Fan Auto/On, Temperature setpoint. Blower Speeds: Adjustable for heating and cooling modes. Limit Controls: Automatic high-temperature shutdown. Pressure Switches: Verify proper venting operation. Ignition Control: Sequences pilot ignition and main burner.

Venting and Combustion Air

Direct vent system using PVC pipe for intake and exhaust.

Vent pipe: Schedule 40 PVC, CPVC, or ABS; maintain 1/4" per foot slope.
Terminations: Roof or sidewall; maintain clearances to openings.
Combustion air: Dedicated piping or room air depending on installation.
Condensate drain: Properly trapped and routed to drain.

Tip: Keep vent terminations clear of snow, debris, and obstructions.

Operating Instructions

Normal operation controlled by thermostat.

Set thermostat to desired temperature and HEAT mode.
Furnace will initiate startup sequence when heat demanded.
Inducer motor starts first to establish draft.
Hot surface igniter glows, gas valve opens.
Main burner ignites, blower starts after heat exchanger warms.
Cycle completes when thermostat satisfied.
For continuous fan operation, set thermostat fan to ON.

WARNING! If you smell gas, turn off gas supply immediately and call professional.

Maintenance Procedures

Regular maintenance ensures efficiency and safety.

Monthly: Check and replace air filter as needed.
Annual: Professional inspection and cleaning.
Visual inspection: Check vent pipes, drain lines, burners.
Component check: Blower wheel, heat exchanger, electrical connections.
Combustion analysis: Verify proper operation and efficiency.

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

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for US and Canada. UL listed. Complies with Department of Energy efficiency standards. Manufactured by Amana Heating & Air Conditioning. For support, contact Amana Customer Service at 1-888-292-6262 or visit www.amana-hac.com.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, door switch engagement.
No heat	Gas supply, ignition, filter	Verify gas valve on, check igniter, replace dirty filter.
Short cycling	Filter, limit switch, airflow	Clean/replace filter, check for restricted airflow.
Blower not running	Motor, capacitor, control board	Check for power to blower, capacitor condition.
LED error codes	Various system faults	Count flashes and refer to diagnostic chart in manual.
Strange odors	Dust, overheating components	Clean system, check for overheating electrical.

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

Service: 1-888-292-6262; www.amana-hac.com