installation manual furnace icp gua120

The ICP GUA120 is a high-efficiency gas furnace designed for residential heating applications with 120,000 BTU input capacity, multi-speed blower motor, electronic ignition system, durable heat exchanger, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

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

Features at a Glance

Key components: Gas valve assembly, heat exchanger, blower motor, electronic ignition, pressure switches, flame sensor, and control board.

Feature	Description
Input Capacity	120,000 BTU/hour
Efficiency Rating	Up to 96% AFUE
Blower Motor	Multi-speed ECM motor
Ignition System	Hot surface electronic ignition
Gas Type	Natural gas (convertible to LP)
Venting	PVC pipe compatible
Control Board	Integrated furnace controller
Safety Features	Flame rollout switches, pressure switches, limit switches
Filter Size	Standard 16x25x1 inch
Warranty	Limited lifetime heat exchanger

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and location requirements.

Location: Install in approved area with proper clearances (minimum 1 inch from combustible materials).
Venting: Install PVC vent pipes according to local codes and manufacturer specifications.
Gas Connection: Use approved gas pipe and fittings; pressure test before operation.
Electrical: Connect to dedicated 120V circuit; proper grounding required.
Ductwork: Ensure proper return and supply duct sizing and sealing.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Only qualified technicians should install.

First-Time Setup

Complete installation verification before initial startup.

Gas pressure adjustment: Set manifold pressure to 3.5" WC for natural gas.
Blower speed settings: Adjust dip switches for proper airflow.
Thermostat wiring: Connect compatible thermostat following wiring diagram.
System checkout: Verify all safety controls and ignition sequence.
Combustion analysis: Verify proper combustion readings.

CAUTION! Test for gas leaks with soap solution before energizing system.

Specifications

Model: ICP GUA120
Input BTU: 120,000 BTU/hour
Output BTU: 115,200 BTU/hour
AFUE Rating: 96%
Electrical: 115V/60Hz/1Ph
Gas Connection: 1/2" NPT
Vent Size: 2" or 3" PVC
Dimensions: 55" H x 21" W x 26" D
Shipping Weight: 185 lbs
Sound Rating: < 65 dB

Controls and Settings

Access control board via front panel. Integrated furnace controller with status LED.

Control Board: POWER switch, status LED, dip switches for blower speeds, diagnostic codes.

Operating Modes: HEAT, COOL, FAN ONLY. Blower Settings: HEAT speed, COOL speed, continuous fan. Temperature Control: Compatible with single-stage and programmable thermostats. Safety Controls: Limit switches, pressure switches, flame sensor, rollout switches.

Connecting Systems

Thermostat: Standard 5-wire connection. Venting: PVC pipe system. Gas: Black iron pipe with sediment trap.

Turn off power and gas supply before making connections.
Follow wiring diagram for thermostat connections (R, W, G, Y, C).
Install condensate drain line with proper trap and routing.
Connect vent pipes with proper slope and supports.

Tip: Use pipe dope approved for natural/LP gas on all threaded connections.

Operating Procedures

Normal heating operation with electronic ignition sequence.

Startup: Thermostat calls for heat, inducer motor starts, pressure switch proves draft.
Ignition: Hot surface igniter glows, gas valve opens, flame established.
Heating: Blower starts after heat exchanger warm-up period.
Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down.
Fan Operation: AUTO or CONTINUOUS modes available.

WARNING! Never operate without proper venting and combustion air supply.

Safety Features

Multiple safety systems: Flame rollout switches, high limit switches, pressure switches, flame sensor, condensate overflow switch.

Maintenance & Cleaning

Annual maintenance required for optimal performance and safety.

Filter replacement: Monthly during heating season.
Heat exchanger inspection: Annual visual inspection.
Blower cleaning: Remove and clean annually.
Drain system: Flush condensate trap and lines.
Burner inspection: Clean and verify proper flame pattern.

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

Regulatory Information

UL certified; meets ANSI Z21.47 standards. CSA certified for Canada. Installation must comply with National Fuel Gas Code NFPA 54, local building codes, and manufacturer specifications. For technical support, contact ICP at 1-800-427-3343 or visit www.icpindex.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Thermostat, power, gas supply	Check thermostat setting, circuit breaker, gas valve position.
Furnace locks out	Safety switch tripped	Reset power; check status LED for error code.
Blower won't start	Motor, capacitor, control board	Check voltage to motor; inspect capacitor; verify control signals.
Ignition failure	Gas pressure, igniter, sensor	Verify gas pressure; check igniter continuity; clean flame sensor.
Short cycling	Dirty filter, airflow issues	Replace filter; check for blocked vents or returns.

Reset: Turn power off for 30 seconds then restore.

Service: 1-800-427-3343; www.icpindex.com