Day and Night Gas Furnace Manual

The Day and Night Gas Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. Available in various models with AFUE ratings up to 96%, it features electronic ignition, variable-speed blower motors, durable heat exchangers, safety controls, and compatibility with smart thermostats. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Settings 6. Venting and Combustion Air 7. Operating Instructions 9. Maintenance Procedures 10. Safety Information 11. Regulatory Compliance 12. Troubleshooting Guide

Features at a Glance

Key components: Gas valve, heat exchanger, blower assembly, electronic control board, igniter, flame sensor, pressure switches, and venting system.

Feature	Description
Heat Exchanger	Stainless steel construction for durability and efficiency
Blower Motor	Variable-speed ECM motor for quiet operation and energy savings
Ignition System	Hot surface igniter for reliable lighting
Gas Valve	Modulating valve for precise temperature control
Control Board	Microprocessor-based for advanced diagnostics and control
Pressure Switches	Safety devices to ensure proper venting operation
Flame Sensor	Detects burner flame for safety shutdown if needed
Air Filter	Standard 1-inch or 4-inch media filter compatibility
Thermostat Connection	Compatible with conventional and smart thermostats
Service Light	LED indicator for maintenance reminders

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; pressure test for leaks before operation.
Electrical: 120V AC dedicated circuit required; proper grounding essential.
Venting: Follow manufacturer specifications for PVC vent pipe sizing and routing.
Drain Lines: Connect condensate drain to suitable disposal point.

WARNING! Gas appliances can produce carbon monoxide. Proper venting and combustion air are critical for safe operation.

First-Time Setup

Complete installation verification before initial startup.

Gas pressure check: Verify inlet and manifold pressures per specifications.
Venting verification: Confirm proper draft and secure connections.
Electrical connections: Check wiring and thermostat configuration.
Initial startup: Follow lighting instructions; observe first heating cycle.
System check: Verify proper operation through complete heating cycle.

CAUTION! Only qualified HVAC technicians should perform installation and startup procedures.

Technical Specifications

Input Capacity: 40,000 to 120,000 BTU/H depending on model
AFUE Rating: Up to 96% efficiency
Gas Type: Natural gas or LP (conversion kit required)
Electrical: 120V AC, 60Hz, 5-8 amps
Static Pressure: 0.1 to 0.9 inches water column
Venting: PVC Schedule 40, 2-inch or 3-inch diameter
Temperature Rise: 35°F to 65°F
Sound Rating: As low as 65 dBA
Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. Thermostat controls: HEAT, COOL, FAN, EMERGENCY HEAT.

Control Board Lights: Power (green), Heat (yellow), Service (red).

DIP Switch Settings: Fan delay, heating stages, accessory configuration. Gas Valve: Pressure adjustment screws (qualified technician only). Blower Speed: Multi-speed taps for heating and cooling modes. Limit Switches: Automatic high-temperature safety shutdown.

Venting and Combustion Air

Direct vent or conventional venting options available.

Direct Vent: PVC pipes for intake and exhaust through sidewall or roof.
Conventional: Metal B-vent through chimney with proper liner.
Combustion Air: Ensure adequate fresh air supply per local codes.
Clearances: Maintain specified distances from combustible materials.

Tip: Regularly inspect vent terminals for obstructions like snow, leaves, or debris.

Operating Instructions

Normal operation controlled by thermostat settings.

Thermostat Setting: Set to HEAT mode and desired temperature.
Startup Sequence: Inducer motor, pressure switch verification, igniter warm-up, gas valve opening.
Heating Cycle: Burner ignition, blower activation after heat exchanger warm-up.
Shutdown: Gas valve closes, inducer continues for post-purge, blower runs for cool-down.
Fan Operation: AUTO (thermostat controlled) or ON (continuous circulation).

WARNING! Never operate furnace with access panels removed. Keep area around furnace clear.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

Monthly: Check and replace air filter as needed.
Seasonal: Professional inspection before heating season.
Annual: Professional cleaning of burners, heat exchanger, and flue passages.
Blower Maintenance: Clean blower wheel and housing annually.
Drain System: Clear condensate trap and drain lines.

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

Safety Information

Carbon monoxide detectors required in sleeping areas and near furnace.

Emergency Shutdown: Turn off gas valve and electrical power if unusual operation detected.

Smell Gas Procedures: Do not operate electrical switches; evacuate immediately; call gas company from outside.

Regulatory Compliance

ANSI Z21.47: Certified for natural gas and LP operation. UL 1995: Standard for heating and cooling equipment. Meets DOE efficiency standards. For support, visit www.dayandnightfurnace.com or contact 1-800-722-2100.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker; verify thermostat setting; ensure door panels secure.
No heat	Gas supply, igniter, flame sensor	Verify gas valve on; check for dirty flame sensor; inspect igniter.
Short cycling	Airflow, filter, limit switch	Replace dirty filter; check for blocked vents; verify proper airflow.
Blower doesn't run	Motor, capacitor, control board	Check for loose wires; test capacitor; verify control board output.
Unusual noises	Blower wheel, inducer motor	Inspect for loose parts; clean blower wheel; check motor bearings.

Reset Procedure: Turn power off for 30 seconds, then restore.

Service: 1-800-722-2100; www.dayandnightfurnace.com