Daikin Furnace Manuals

The Daikin Furnace series represents high-efficiency residential heating systems designed for optimal performance and energy savings. These furnaces feature advanced combustion technology, variable-speed blowers, smart thermostat compatibility, and durable construction. Below are comprehensive sections covering installation, operation, maintenance, troubleshooting, and technical specifications for Daikin furnace models.

Features at a Glance

Key components: High-efficiency heat exchanger, variable-speed ECM motor, digital control board, ignition system, air filter compartment, flue vent connection.

Feature	Description
AFUE Rating	Up to 98% Annual Fuel Utilization Efficiency
Variable-Speed Blower	ECM motor for quiet operation and energy savings
Smart Thermostat Compatible	Works with Wi-Fi and programmable thermostats
Dual Fuel Capability	Compatible with heat pump systems
Diagnostic LED	Visual fault code display for troubleshooting
Multi-Speed Operation	Adjustable airflow for comfort and efficiency
Durable Heat Exchanger	Stainless steel construction for long lifespan
Quiet Operation	Sound-absorbing insulation and vibration dampeners
Safety Features	Flame rollout switch, pressure switches, limit controls
Filter Monitoring	Reminder system for filter replacement

Installation Guidelines

Professional installation recommended. Ensure proper location and clearances.

1. Select installation location: Dry, level area with adequate combustion air and service access.
2. Gas line connection: Use approved gas piping and fittings; pressure test for leaks.
3. Electrical connection: 120V AC power supply with proper grounding.
4. Vent system: Install approved PVC or metal venting per local codes.
5. Ductwork: Ensure proper sizing and sealing for optimal airflow.
6. Condensate drain: Route to suitable drain location with trap.

WARNING! Installation must comply with local building codes and manufacturer specifications. Gas work should be performed by licensed professionals.

First-Time Setup

Initial startup and configuration procedures.

1. Power on furnace: Turn on electrical power and gas supply.
2. Thermostat setup: Configure heating setpoints and schedules.
3. Blower speed adjustment: Set appropriate airflow for your duct system.
4. Test operation: Verify proper ignition, heating, and shutdown cycles.
5. Check safety controls: Ensure all limit switches and pressure controls function correctly.

CAUTION! Never bypass safety controls. If furnace fails to start properly, shut off power and consult qualified technician.

Technical Specifications

• Models: Various sizes from 40,000 to 120,000 BTU/h
• AFUE Rating: 80% to 98% depending on model
• Electrical: 120V AC, 60Hz, 15 Amp circuit
• Gas Type: Natural gas or LP/propane (conversion kit required)
• Blower Motor: Variable-speed ECM
• Sound Level: As low as 65 dB operating noise
• Venting: Category IV sealed combustion or conventional B-vent
• Warranty: Limited lifetime heat exchanger, 10 years parts
• Dimensions: Varies by model (typical: 45"H x 21"W x 26"D)
• Weight: 120-180 lbs depending on model

Controls and Settings

Integrated control board with diagnostic LED and DIP switch settings.

Control Board Features: Status LED (flashing codes), DIP switches for blower speed, thermostat compatibility settings, reset button.

Thermostat Settings: Heat mode selection, temperature setpoints, fan control (auto/on), system mode (heat/cool/off). Advanced Settings: Blower off delay, ignition retry, fault code history (on some models).

Connecting to Thermostat

Compatible with most 24V thermostats including programmable and Wi-Fi models.

1. Turn off power to furnace at circuit breaker.
2. Remove furnace access panel to access control board.
3. Connect thermostat wires: R (power), W (heat), G (fan), C (common), Y (cool - if applicable).
4. Secure connections and replace access panel.
5. Restore power and test thermostat operation.

Tip: Use 18-gauge thermostat wire for runs under 100 feet. For longer runs, use 16-gauge.

Operating Modes

Multiple operating modes for efficiency and comfort.

1. Heating Mode: Primary operation for space heating.
2. Fan Only Mode: Circulates air without heating.
3. Continuous Fan: Maintains air circulation between heating cycles.
4. Dual Fuel Mode: Coordinates with heat pump for optimal efficiency.
5. Standby Mode: System ready but not actively heating.

WARNING! Do not operate furnace with access panels removed. Keep combustible materials away from furnace.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check and replace air filter if dirty.
2. Seasonal: Inspect vent system for obstructions.
3. Annual: Professional inspection and cleaning.
4. As needed: Clean flame sensor and check heat exchanger.
5. Biannual: Lubricate blower motor (if required by model).

Care & Cleaning

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

CAUTION! Never use water or liquid cleaners on electrical components. Keep burners and ignition system clean and dry.

Regulatory Information

UL certified and complies with ANSI Z21.47 standards. Meets DOE efficiency requirements. Manufactured to ISO 9001 quality standards. For technical support, visit www.daikincomfort.com or contact 1-855-344-2546. All installations must comply with National Fuel Gas Code (NFPA 54) and local building codes.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power off, thermostat setting, door switch	Check circuit breaker, thermostat heat mode, ensure doors closed properly
No heat	Gas supply, ignition failure, filter	Verify gas valve on, check for ignition attempts, replace dirty filter
Short cycling	Dirty filter, blocked vent, limit switch	Clean/replace filter, check vent termination, reset limit switch
Blower runs continuously	Thermostat fan setting, control board	Check thermostat fan setting (auto/on), inspect control board
Unusual noises	Loose parts, motor bearings, ductwork	Tighten access panels, inspect blower motor, check duct connections
LED error code flashing	Various system faults	Count flashes and refer to fault code chart in manual

Reset Procedure: Turn thermostat to off, turn off power for 30 seconds, restore power, set thermostat to heat.

Service: 1-855-344-2546; www.daikincomfort.com