KSL-1700X-A3 Furnace Manual

The KSL-1700X-A3 is a high-efficiency residential furnace with 95% AFUE rating, variable-speed blower motor, two-stage gas valve operation, electronic ignition system, durable heat exchanger construction, integrated diagnostic controls, multiple-speed airflow adjustment, safety shut-off features, and compatibility with standard thermostat systems. Designed for reliable heating performance in residential applications. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Two-stage gas valve, variable-speed ECM blower motor, stainless steel heat exchanger, integrated control board, pressure switches, flame sensor, hot surface ignitor, and diagnostic LED indicators.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in approved mechanical room with proper clearances.
2. Venting: Use approved PVC or metal venting materials per manufacturer specifications.
3. Gas connection: Use black iron pipe with proper sizing; pressure test required.
4. Electrical: 120V AC dedicated circuit; proper grounding required.
5. Ductwork: Sized appropriately for furnace capacity and home requirements.

WARNING! Gas appliances can be hazardous; installation must be performed by qualified technician. Carbon monoxide poisoning hazard if improperly installed.

Initial Setup & Startup

Complete installation verification before initial startup.

1. Gas pressure adjustment: Set manifold pressure to 3.5" WC for natural gas.
2. Blower speed selection: Set appropriate cooling and heating speeds for application.
3. Thermostat configuration: Compatible with most 24VAC thermostat systems.
4. System checkout: Verify proper ignition sequence and flame characteristics.
5. Combustion analysis: Verify CO levels and efficiency measurements.

CAUTION! Never bypass safety controls. Verify all connections before applying power.

Technical Specifications

• Heating Capacity: 70,000 BTU/hr input
• AFUE Rating: 95%
• Gas Type: Natural gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5.2 amps
• Blower Motor: Variable-speed ECM
• Stages: Two-stage heating operation
• Venting: PVC pipe (2" minimum)
• Static Pressure: 0.1" to 0.8" WC maximum
• Operating Temp Range: -30°F to 120°F ambient
• Dimensions: 21"W x 45"H x 26"D

Control System Operation

Integrated control board manages all furnace functions with LED status indicators.

Normal Operation Sequence: Call for heat → Inducer motor on → Pressure switch verification → Hot surface ignitor on → Gas valve opens → Flame detection → Blower motor on after heat exchanger warm-up.

Diagnostic Codes: LED flashes indicate specific error conditions (1 flash = pressure switch fault, 2 flashes = ignition failure, 3 flashes = limit switch open, etc.)

Thermostat Compatibility: Works with most single-stage and two-stage thermostats. For optimal performance, use compatible communicating thermostat.

Venting & Combustion Air

Direct vent system with separate intake and exhaust. Follow local codes for venting requirements.

1. Vent pipe sizing: Minimum 2" PVC for runs up to 40 feet.
2. Vent termination: Maintain proper clearances from windows, doors, and air intakes.
3. Combustion air: Ensure adequate fresh air supply for proper combustion.
4. Condensate drainage: Properly trap and drain condensate to approved location.

Tip: Keep vent pipes clear of debris and ensure proper slope for condensate drainage.

Maintenance Procedures

Annual maintenance required for optimal performance and warranty compliance.

1. Filter replacement: Change 1" filter monthly; 4" media filter every 6 months.
2. Heat exchanger inspection: Visually check for cracks or corrosion annually.
3. Blower cleaning: Remove and clean blower wheel and housing annually.
4. Flame sensor cleaning: Gently clean with emery cloth each heating season.
5. Drain system: Flush condensate trap and drain lines annually.
6. Electrical connections: Check for tightness and signs of overheating.
7. Gas pressure verification: Check and adjust if necessary.

WARNING! Disconnect electrical power before performing any maintenance. Gas valve must be shut off when servicing gas components.

Safety Features

Multiple safety systems protect against hazardous conditions: High limit switch, flame rollout switches, pressure switches, flame sensor, ignitor control, and lockout protection.

Regulatory Compliance

UL certified for safety standards. ANSI Z21.47 compliant for gas-fired central furnaces. Meets DOE energy efficiency standards. For support, contact manufacturer technical service at 1-800-555-HEAT or visit www.kslfurnace.com.

Troubleshooting Guide

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

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