Janitrol Furnace A48-20 Manual

The Janitrol A48-20 is a high-efficiency gas furnace designed for residential heating applications. This 48,000 BTU unit features single-stage operation, natural gas compatibility, electronic ignition, multi-speed blower motor, and durable heat exchanger construction. 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. Specifications 5. Controls and Settings 6. Venting Requirements 7. Operating Instructions 8. Maintenance Procedures 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, electronic ignition system, limit switches, pressure switch, and control board.

Feature	Description
Heat Exchanger	Durable aluminized steel construction
Blower Motor	Multi-speed PSC motor for airflow control
Ignition System	Electronic hot surface ignition
Gas Valve	Single-stage automatic gas control
Limit Switches	High-temperature safety cutoff
Pressure Switch	Verifies proper venting operation
Control Board	Integrated furnace controller
Filter Rack	Standard 1-inch filter accommodation
Drain Connection	Condensate removal system
Electrical Connection	120V AC, 60Hz power requirement

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and level mounting surface.

Location: Install in dry, well-ventilated area with proper clearances (minimum 1 inch sides, 6 inches front).
Gas Connection: Use approved gas pipe and fittings; pressure test for leaks.
Electrical Wiring: Connect to 120V dedicated circuit with proper grounding.
Venting: Install according to local codes and manufacturer specifications.
Drain Line: Connect condensate drain to proper disposal point.

WARNING! Gas furnace installation must be performed by qualified technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Complete installation verification before initial startup.

Gas Pressure Check: Verify inlet and manifold pressures per specifications.
Venting Inspection: Ensure proper draft and clear vent passages.
Electrical Verification: Check voltage and proper thermostat connections.
Airflow Setup: Adjust blower speed for proper CFM delivery.
System Check: Perform complete operational sequence test.

CAUTION! Never bypass safety devices. Always verify proper operation before leaving installation.

Specifications

Heating Capacity: 48,000 BTU/H input
Efficiency: 80% AFUE
Gas Type: Natural Gas
Electrical: 120V AC, 60Hz, 5 Amps
Blower Motor: Multi-speed PSC, 1/3 HP
Airflow: 800-1200 CFM adjustable
Venting: Category I, 4-inch diameter
Dimensions: 21"W x 21"D x 45"H
Weight: 98 lbs
Operating Temp Rise: 35-65°F

Controls and Settings

Access control board via front service panel. Thermostat controls heating operation.

Control Board: LED status indicator, diagnostic codes, reset button, dip switch settings.

Blower Speed: Adjust via motor taps (COOL, HEAT). Gas Pressure: Factory set, verify during installation. Limit Settings: Automatic high-temperature cutoff. Pressure Switch: Verifies inducer operation. Ignition Control: Automatic trial for ignition sequence.

Venting Requirements

Category I venting system required. Follow local codes and manufacturer guidelines.

Vent Material: Use approved B-vent or listed vent pipe.
Termination: Minimum 3 feet from operable windows and 1 foot above grade.
Clearances: Maintain required clearances to combustibles.
Slope: Horizontal runs should slope upward 1/4 inch per foot.

Tip: Always verify proper draft after installation and annually.

Operating Instructions

Normal operation controlled by thermostat. System follows automatic sequence.

Call for Heat: Thermostat initiates heating cycle.
Inducer Operation: Pressure switch verifies proper venting.
Ignition Sequence: Hot surface igniter glows, gas valve opens.
Flame Verification: Flame sensor confirms ignition.
Blower Operation: Blower activates after heat exchanger warm-up.
Cycle Completion: Thermostat satisfied, gas valve closes, blower continues cool-down.

WARNING! Never operate without proper venting and air filters installed.

Maintenance Procedures

Regular maintenance ensures safe and efficient operation.

Monthly: Check and replace air filter as needed.
Annual: Professional inspection and cleaning.
Burner Cleaning: Remove and clean burners annually.
Heat Exchanger: Visual inspection for cracks or damage.
Blower Assembly: Clean blower wheel and housing.
Drain System: Clear condensate trap and drain lines.

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

Safety Features

Multiple safety devices protect against hazardous conditions.

Safety Device	Function
High Limit Switch	Shuts off burner if overheating detected
Flame Rollout Switch	Detects improper burner flame pattern
Pressure Switch	Ensures proper inducer operation
Flame Sensor	Confirms burner ignition
Gas Valve	Automatic shutoff if ignition fails

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for natural gas operation. UL listed. Must be installed in accordance with National Fuel Gas Code (NFPA 54) and local codes. For technical support, contact Janitrol Customer Service at 1-800-654-3286 or visit www.janitrol.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Thermostat, power, gas supply	Check thermostat setting, circuit breaker, gas valve position.
Furnace won't start	Safety lockout, pressure switch	Reset power, check venting, verify pressure switch operation.
Short cycling	Dirty filter, limit switch	Replace filter, check airflow, verify limit switch operation.
Blower won't stop	Thermostat, control board	Check thermostat fan setting, control board relay.
Ignition failure	Gas supply, igniter, sensor	Verify gas pressure, check igniter, clean flame sensor.

Reset: Turn power off for 30 seconds to reset control board.

Service: 1-800-654-3286; www.janitrol.com