Jandy LXi 400 Manual

The Jandy LXi 400 is a high-efficiency pool heater with advanced digital controls, designed for residential swimming pool applications. This heater features electronic ignition, digital temperature display, easy-to-use control panel, multiple safety systems, and compatibility with various pool sizes. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Digital control panel, Electronic ignition system, Heat exchanger, Water pressure switch, Temperature sensor, Gas valve assembly.

Feature	Description
Digital Control Panel	LCD display with temperature readout and status indicators
Electronic Ignition	Pilotless ignition for reliable startup
Heat Exchanger	Copper construction for efficient heat transfer
Water Pressure Switch	Ensures proper water flow before ignition
Temperature Sensor	Monitors water temperature for precise control
Gas Valve Assembly	Regulates gas flow to burner
Safety Lock	Prevents unauthorized temperature changes
Freeze Protection	Automatic operation in freezing conditions
Error Code Display	Shows diagnostic codes for troubleshooting
Pool/Spa Mode	Dual temperature settings for pool and spa

Installation

Unpack and inspect contents. Place on level, stable surface near pool equipment.

1. Gas Connection: Use approved gas piping; check for leaks with soap solution.
2. Water Connections: Connect to pool return line using appropriate fittings.
3. Electrical Connection: Connect to 120V AC power source with proper grounding.
4. Ventilation: Ensure adequate clearance and proper venting as per local codes.

WARNING! Installation must be performed by qualified technician. Follow all local codes and regulations.

First-Time Setup

Power on heater; follow startup procedure.

1. Initial Power Up: Turn on power; control panel will display startup sequence.
2. Set Temperature: Use up/down buttons to set desired pool temperature.
3. Configure Mode: Select POOL or SPA mode based on application.
4. Test Operation: Verify proper ignition and heating operation.

CAUTION! Ensure proper water flow before starting heater to prevent damage.

Specifications

• Heating Capacity: 400,000 BTU/hr
• Efficiency: 84% Thermal Efficiency
• Gas Type: Natural Gas or Propane (field convertible)
• Water Connections: 2-inch NPT
• Electrical: 120V AC, 60Hz
• Dimensions: Standard pool heater footprint
• Weight: Approximately 150 lbs
• Temperature Range: 50°F to 104°F
• Control: Digital microprocessor
• Warranty: Limited lifetime heat exchanger warranty

Controls and Settings

Access settings via digital control panel. Front Panel: POWER, TEMP UP/DOWN, MODE, MENU.

Display Indicators: Temperature readout, Heater status, Error codes, Pool/Spa mode.

Temperature Settings: Adjustable from 50°F to 104°F. Mode Selection: POOL for general heating, SPA for rapid heating. Menu Options: Temperature calibration, Freeze protection settings, Service codes, Factory reset.

Connecting to Pool System

Connect to existing pool plumbing and filtration system.

1. Turn off pool pump and gas supply before connecting.
2. Install heater downstream of filter and upstream of chemical feeder.
3. Use appropriate pipe size and unions for easy service access.
4. Verify water flow direction matches heater arrows.

Tip: Install isolation valves for easy maintenance and service.

Operation

Supports automatic and manual heating modes.

1. Startup: Ensure water flow; press POWER button.
2. Set Temperature: Use TEMP buttons to desired setting.
3. Monitor: Watch for proper ignition and temperature rise.
4. Shutdown: Press POWER to turn off; system will cool down.
5. Pool/Spa Mode: Switch modes as needed for different applications.
6. Freeze Protection: Automatic operation when temperatures drop below 40°F.
7. Status Monitoring: Check display for current operating status.
8. Error Codes: Note any displayed codes for reference.

WARNING! Never operate without proper water flow. Monitor for unusual noises or smells.

Maintenance

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check for debris around unit; verify proper water flow.
2. Seasonal: Inspect burners, heat exchanger, and venting.
3. Annual: Professional inspection of gas connections and safety devices.
4. Water Chemistry: Maintain proper pool chemistry to prevent scale buildup.

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

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
Water Pressure Switch	Prevents operation without water flow
High Limit Switch	Shuts off heater if temperature exceeds safe limits
Flame Rollout Switch	Detects improper burner operation
Air Flow Switch	Ensures proper venting operation
Gas Valve Safety	Automatic shutoff if ignition fails

Regulatory Information

UL Listed: Complies with UL Standard 1261. ANSI: Meets ANSI Z21.56 standards. CSA: Certified to CSA 4.7 standards. For Natural Gas and Propane installations. Copyright © Jandy Products. All specifications subject to change without notice. For technical support, visit www.jandy.com or contact 1-800-227-1442.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Heater won't start	No power/water flow	Check circuit breaker; verify pump is running; check water pressure switch.
No ignition	Gas supply/ignition	Verify gas valve open; check for spark at igniter; reset system.
Error code displayed	System fault	Refer to error code chart in manual; note code and contact service.
Poor heating	Flow rate/thermostat	Check filter cleanliness; verify proper water flow; calibrate temperature sensor.
Unusual noises	Scale/air in system	Check for scale buildup; purge air from system; inspect heat exchanger.

Reset: Turn power off for 30 seconds then restart.

Service: 1-800-227-1442; www.jandy.com