Jandy LT Heater Manual

The Jandy LT Heater is a high-efficiency pool and spa heater designed for reliable performance and easy operation. This gas-fired heater features electronic ignition, digital temperature control, corrosion-resistant components, safety shut-off systems, and compatibility with various pool automation systems. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Digital control panel, Heat exchanger, Burner assembly, Gas valve, Water pressure switch, Thermal regulator, Exhaust system.

Feature	Description
Digital control panel	LCD display with temperature settings and status indicators
Electronic ignition	Reliable spark ignition system for consistent starts
Heat exchanger	Cupro-nickel construction for corrosion resistance
Gas valve	Precise gas flow control with safety shut-off
Water pressure switch	Ensures proper water flow before ignition
Thermal regulator	Maintains optimal operating temperature
Exhaust system	Vented combustion chamber for safe operation
POWER button	Turns heater on/off
TEMP controls	Up/down buttons for temperature adjustment
POOL/SPA mode	Switches between pool and spa heating modes

Installation Requirements

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

1. Location: Install on level, stable surface with adequate ventilation and clearance from combustible materials.
2. Gas connection: Use approved gas piping; check for leaks with soap solution.
3. Water connections: Connect to pool plumbing with proper unions and valves.
4. Electrical: Connect to proper power source with GFCI protection.
5. Venting: Ensure proper exhaust venting according to local codes.

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

First-Time Setup

Power on heater; follow startup sequence.

1. Check water flow: Ensure pool pump is running and water is circulating.
2. Gas supply: Verify gas valve is open and supply is adequate.
3. Set temperature: Use TEMP buttons to set desired pool/spa temperature.
4. Select mode: Choose POOL or SPA mode based on application.
5. Start heating: Press POWER to begin heating cycle.

CAUTION! Do not operate without proper water flow. Ensure all safety systems are functional.

Technical Specifications

• Heater Type: Natural Gas/LP Gas pool and spa heater
• BTU Output: 125,000 to 400,000 BTU (model dependent)
• Efficiency: Up to 85% thermal efficiency
• Water Connections: 2-inch PVC unions
• Gas Connection: 3/4-inch to 1-1/4-inch NPT
• Electrical: 120V AC, 60Hz
• Control: Digital temperature control with LCD display
• Dimensions: Varies by model (typically 28"W x 30"H x 16"D)
• Weight: 85-120 lbs depending on model

Controls and Operation

Access controls via digital panel. Front Panel: POWER, TEMP UP/DOWN, POOL/SPA, MENU.

Remote Control: Available for compatible models with temperature adjustment and mode selection.

Temperature Settings: Range from 65°F to 104°F. Mode Selection: POOL for general heating, SPA for rapid heating. Menu Options: System diagnostics, error codes, service mode. Safety: Automatic shut-off for high temperature, low water flow, or gas supply issues.

Connecting to Pool Systems

Compatible with Jandy automation systems and most pool controllers.

1. Turn off power to heater and automation system.
2. Connect communication cable to automation interface.
3. Connect water temperature sensor if required.
4. Configure automation system for heater control.
5. Test remote operation through automation interface.

Tip: Ensure proper communication protocol settings for compatibility with your automation system.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check for debris around unit and clean filter.
2. Quarterly: Inspect burner assembly and heat exchanger.
3. Annually: Professional inspection of gas connections, electrical components, and safety systems.
4. Seasonal: Winterize if located in freezing climates.
5. Water Chemistry: Maintain proper pool chemistry to prevent scale and corrosion.

WARNING! Always turn off gas and electrical power before performing maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
Water Pressure Switch	Prevents operation without adequate water flow
High Limit Switch	Shuts off heater if temperature exceeds safe limits
Flame Rollout Switch	Detects improper burner operation
Gas Valve Safety	Automatic shut-off for gas supply issues
Thermal Fuse	Protects against overheating

Care & Cleaning

Turn off power before cleaning. Keep area around heater clear of debris.

1. Exterior: Wipe with damp cloth; do not use harsh chemicals.
2. Vents: Keep exhaust and intake vents clear of obstructions.
3. Burner compartment: Have professional clean annually.
4. Heat exchanger: Professional inspection for scale buildup.

CAUTION! Do not spray water directly on electrical components. Keep flammable materials away from heater.

Regulatory Information

UL listed and certified to ANSI Z21.56 standards. Complies with CSA requirements for pool heaters. Manufactured to meet EPA emissions standards where applicable. Copyright © Jandy Products. All specifications subject to change without notice. For technical support, contact Jandy Technical Support at 1-800-227-1442 or visit www.jandy.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Heater won't start	Power supply/water flow	Check circuit breaker; ensure pump is running; verify water flow.
No ignition	Gas supply/ignition system	Check gas valve; verify spark ignition; inspect electrode.
Error codes displayed	System faults	Refer to error code chart in manual; reset system if safe.
Insufficient heating	Gas pressure/flow rate	Check gas pressure; verify proper water flow; clean filter.
Frequent shutdowns	Safety system activation	Check water flow switch; inspect high limit switch; verify venting.

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

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