KSL-1700X Furnace Manual

The KSL-1700X is a high-efficiency residential furnace with 95% AFUE rating, variable-speed blower motor, two-stage gas valve operation, electronic ignition system, stainless steel heat exchanger, built-in diagnostic LED, compatibility with standard thermostat systems, and safety features including flame rollout switch and pressure switches. Designed for natural gas operation with optional LP conversion kit. 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. Operation Modes 8. Maintenance Schedule 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stainless steel heat exchanger, variable-speed ECM blower motor, two-stage gas valve, hot surface ignitor, pressure switches, flame sensor, diagnostic LED.

Feature	Description
Heat Exchanger	Stainless steel construction for durability and efficiency
Blower Motor	Variable-speed ECM for quiet operation and energy savings
Gas Valve	Two-stage operation for improved comfort and efficiency
Ignition System	Electronic hot surface ignitor for reliable starts
Diagnostic LED	Built-in status light for troubleshooting
Pressure Switches	Safety devices to ensure proper venting
Flame Sensor	Detects burner flame for safety shutdown
Filter Rack	Standard 1-inch or optional 4-inch media filter
Control Board	Microprocessor-based for precise operation
Vent Connections	PVC pipe compatible for sidewall or roof venting

Installation

Unpack and inspect contents. Ensure proper clearances and level installation.

Gas connection: Use approved gas pipe and fittings; pressure test for leaks.
Electrical connection: Connect to 120V AC power; proper grounding required.
Vent system: Install PVC vent pipes according to local codes and manufacturer specifications.
Condensate drain: Route to approved drain location; install trap as required.
Thermostat wiring: Connect appropriate wires to control board terminals.

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

First-Time Setup

Power on furnace; follow startup sequence.

System check: Verify all connections secure and gas valve open.
Thermostat setup: Set to heat mode with desired temperature.
Initial ignition: System will perform self-check and attempt ignition.
Blower operation: Verify proper airflow and temperature rise.
Gas pressure: Adjust manifold pressure if necessary per specifications.

CAUTION! Never bypass safety devices. Ensure combustion air supply is adequate.

Specifications

Heating Capacity: 60,000-100,000 BTU/hr (multiple models)
AFUE Rating: 95%
Gas Type: Natural gas (LP conversion kit available)
Electrical: 120V AC, 60Hz, 5 Amps
Blower Motor: Variable-speed ECM
Stages: Two-stage heating operation
Vent Material: PVC, CPVC, or ABS
Sound Rating: Ultra-quiet operation
Warranty: 20-year heat exchanger, 5-year parts
Dimensions: Varies by model (check specific model label)

Controls and Settings

Access control board via front panel. Status LED indicates system operation and fault codes.

Thermostat Controls: HEAT/COOL/OFF mode, temperature setting, fan AUTO/ON.

Gas Valve: Two-stage operation (low/high fire). Blower: Variable speed with multiple airflow settings. Safety: Flame rollout switch, pressure switches, high limit switch. Diagnostics: LED flash codes for troubleshooting (1 flash = normal, 2 flashes = pressure switch, etc.).

Connecting Thermostat

Standard thermostat connections: R (power), W (heat), G (fan), C (common), Y (cooling).

Turn off power to furnace before wiring.
Match thermostat wires to control board terminals.
Use proper gauge thermostat wire (18-22 AWG recommended).
Program thermostat for proper system operation.

Tip: For advanced thermostats, follow manufacturer's programming guide for optimal performance.

Operation Modes

Supports heating operation with variable comfort settings.

Standby mode: System ready, awaiting thermostat call for heat.
Ignition sequence: Prepurging, ignitor warm-up, gas valve opening, flame verification.
Low-stage operation: Quiet, efficient heating for moderate conditions.
High-stage operation: Maximum heating capacity for cold conditions.
Fan operation: Circulates air during heating cycle and after burner shutdown.
Shutdown sequence: Gas valve closes, post-purge blower operation.

WARNING! Never operate without proper venting and combustion air. Monitor for unusual sounds or odors.

Maintenance Schedule

Monthly: Check and replace air filter if dirty. Annual: Professional inspection and cleaning.

Care & Cleaning

Turn off power before servicing. Clean burners, heat exchanger, and blower assembly annually.

CAUTION! Use only approved cleaning methods. Never use water on electrical components.

Regulatory Information

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

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Thermostat setting/power	Check thermostat setting; verify power to furnace; check circuit breaker.
Furnace not starting	Safety lockout	Check diagnostic LED; reset power; check filter for blockage.
Blower not running	Motor/control issue	Verify thermostat fan setting; check blower motor capacitor; inspect control board.
Short cycling	Dirty filter/overheating	Replace air filter; check for blocked vents; verify proper airflow.
Unusual noises	Mechanical issues	Inspect blower wheel; check motor bearings; verify proper clearance.

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

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