Day Night Furnace Owners Manual

The Day Night Furnace is a high-efficiency heating system designed for residential and light commercial use. This furnace features variable-speed blower technology, electronic ignition, multiple heat stages, smart thermostat compatibility, energy-saving modes, safety shutoff systems, and easy maintenance access. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operating Modes 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, electronic control board, gas valve, ignition system, filter compartment, thermostat connections.

Feature	Description
Variable-speed blower	Adjusts airflow for optimal efficiency and comfort
Electronic ignition	Reliable spark ignition system (no standing pilot)
Multi-stage heating	Two or more heat stages for precise temperature control
Smart thermostat ready	Compatible with programmable and smart thermostats
Filter access door	Easy-access panel for filter replacement
Safety shutoff	Automatic gas valve shutoff for safety
Diagnostic lights	LED status indicators for troubleshooting
Energy-saving mode	Reduces energy consumption during mild weather
Quiet operation	Sound-insulated cabinet and variable-speed motor
Durable construction	Galvanized steel cabinet with corrosion protection

Installation

Unpack and inspect contents. Ensure proper location with adequate clearance.

Position furnace: Place on stable, level surface with proper clearances (check specifications).
Connect gas line: Use approved gas piping and fittings; pressure test for leaks.
Connect electrical: Wire to dedicated circuit breaker; follow local electrical codes.
Connect venting: Install proper vent pipes for combustion gases.
Connect thermostat: Wire to thermostat terminals following wiring diagram.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

Power on furnace; follow startup procedure.

Check gas connection: Ensure gas valve is open and no leaks detected.
Set thermostat: Install and program thermostat according to manufacturer instructions.
Test ignition: Turn thermostat to heat mode; verify proper ignition sequence.
Adjust blower speed: Set appropriate CFM for your duct system if adjustable.
Verify operation: Check heat output and airflow at registers.

CAUTION! Never bypass safety controls. Ensure proper ventilation for combustion air.

Specifications

Heating Capacity: 40,000-120,000 BTU/h (model dependent)
Efficiency: 80-96% AFUE (Annual Fuel Utilization Efficiency)
Fuel Type: Natural gas or propane (conversion kit required)
Electrical: 115V AC, 60Hz, dedicated circuit
Blower Motor: Variable-speed ECM motor
Stages: Single-stage, two-stage, or modulating
Venting: Category I (natural draft) or Category IV (direct vent)
Dimensions: Varies by model (check specific model label)
Warranty: 10-20 years on heat exchanger, 1-5 years on parts

Controls and Settings

Access control board via front service panel. Thermostat controls: HEAT, COOL, FAN, TEMPERATURE settings.

Control Board: Power switch, diagnostic LEDs, dip switches for configuration, reset button.

Operating Modes: HEAT, OFF, FAN ONLY. Blower Settings: Continuous fan, auto fan. Temperature Control: Setpoint adjustment, temperature differential. Advanced Settings: Filter reminder timer, blower off delay, smart recovery (if equipped).

Connecting Thermostat

Compatible with most 24V thermostats. Standard wiring: R (power), W (heat), G (fan), C (common), Y (cool).

Turn off power at circuit breaker before wiring.
Remove old thermostat and label wires.
Connect wires to corresponding terminals on new thermostat.
Mount thermostat and restore power.
Program thermostat according to manufacturer instructions.

Tip: Use compatible thermostat for full feature operation. Smart thermostats may require C-wire.

Operating Modes

Supports multiple operating modes for comfort and efficiency.

Heat Mode: Primary heating operation with staged heat output.
Fan Only: Circulates air without heating for air distribution.
Auto Mode: Automatically switches between heating and off based on thermostat setting.
Energy Saver: Reduces blower runtime and optimizes temperature swings.
Vacation Mode: Maintains minimum temperature to prevent freezing.
Smart Recovery: Learns heating cycle time to reach set temperature at scheduled times.

WARNING! Do not set thermostat above 80°F (27°C) for extended periods to prevent overheating.

Safety Features

Flame Rollout Switch: Shuts off gas if flame detected outside burner. High Limit Switch: Prevents overheating by shutting off burners. Pressure Switch: Ensures proper venting before ignition. Ignition Lockout: Prevents repeated ignition attempts after failures. Gas Valve Safety: Automatic shutoff if flame not detected.

Maintenance & Cleaning

Turn off power and gas before maintenance. Replace air filter monthly during heating season. Annual professional inspection recommended.

CAUTION! Never operate without filter. Keep combustion air intake clear of obstructions. Carbon monoxide detectors required in living spaces.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas-fired central furnaces. Meets DOE energy efficiency standards. EPA compliant for emissions. For support, visit www.daynight.com or contact 1-800-555-HEAT. Manufactured under license by Day Night Heating Systems, Inc.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety switch	Check circuit breaker; verify thermostat setting; reset door switch.
No heat	Gas supply, ignition, filter	Check gas valve; verify pilot/ignition; replace dirty filter.
Short cycling	Filter, thermostat, limit switch	Clean/replace filter; check thermostat location; verify limit switch operation.
Blower not working	Power, motor, capacitor	Check power to blower; test motor and capacitor; check control board.
Unusual noises	Ductwork, motor, bearings	Check for loose panels; lubricate motor if applicable; inspect blower wheel.
Pilot won't stay lit	Thermocouple, gas pressure	Clean/replace thermocouple; check gas pressure; verify proper flame.

Reset: Power cycle at circuit breaker or use reset button on control board.

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