Jandy LT Pool Heater Manual

The Jandy LT Pool Heater is a high-efficiency gas pool heater designed for residential swimming pools, featuring electronic ignition, digital temperature control, corrosion-resistant heat exchanger, built-in freeze protection, easy-to-use controls, and compatibility with various pool sizes. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Operation 6. Water Connections 7. Gas Connections 8. Electrical Connections 9. Maintenance Schedule 10. Safety Information 11. Troubleshooting

Features at a Glance

Key components: Digital control panel, Corrosion-resistant copper heat exchanger, Electronic ignition system, Built-in freeze protection, Temperature display, Power switch, Gas valve, Water pressure gauge.

Feature	Description
Digital control panel	Easy temperature setting and status monitoring
Copper heat exchanger	Corrosion-resistant for long lifespan
Electronic ignition	Energy-efficient spark ignition system
Freeze protection	Automatically activates when temperatures drop below 35°F
Temperature display	LED display showing current and set temperatures
Power switch	Main power control for heater operation
Gas valve	Regulates natural gas or propane flow
Water pressure gauge	Monitors system water pressure
Service lights	LED indicators for system status and errors
Venturi air intake	Optimized air flow for efficient combustion

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and level mounting surface.

Location: Install outdoors with minimum 12-inch clearance from combustible materials.
Mounting: Place on level concrete pad or approved mounting surface.
Water connections: Install with proper plumbing size and unions.
Gas connections: Use approved gas line with shut-off valve.
Electrical: Connect to proper GFCI protected outlet.

WARNING! Heater must be installed by qualified professional. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Complete installation verification before initial startup.

Water system: Fill pool and purge air from lines, check for leaks.
Gas connection: Verify gas type (natural gas/propane) and pressure.
Electrical: Connect to power source and verify ground.
Initial startup: Follow lighting instructions on control panel.
Temperature setting: Set desired pool temperature using digital controls.

CAUTION! Never operate heater without proper water flow. Ensure all safety checks are completed.

Technical Specifications

Heater Type: Natural gas or propane pool heater
BTU Output: 125,000 to 400,000 BTU (model dependent)
Efficiency: Up to 85% thermal efficiency
Water Connections: 2-inch PVC recommended
Gas Connection: 3/4-inch to 1-1/4-inch NPT
Electrical: 120V AC, 60Hz, 3 Amps
Operating Pressure: 10-50 PSI water pressure
Temperature Range: 65°F to 104°F
Dimensions: Varies by model (typically 28"W x 32"H x 16"D)
Weight: 95-150 lbs depending on model

Controls and Operation

Digital control panel with temperature setting, power control, and status indicators.

Control Panel: POWER button, TEMPERATURE ▲/▼ buttons, MODE selector, STATUS LEDs (Power, Heating, Service).

Operation: Press POWER to turn on, use ▲/▼ to set desired temperature. Heater will automatically maintain set temperature. MODE selector allows for pool or spa operation. STATUS LEDs indicate current operation mode and any service requirements.

Water Connections

Proper water flow is critical for safe operation and efficiency.

Install heater after filter and before chemical feeder in plumbing line.
Use unions for easy service and replacement.
Install bypass valve for flow control and service.
Ensure minimum flow rate of 30 GPM for proper operation.
Check water pressure gauge regularly (10-50 PSI normal range).

Tip: Always maintain proper water chemistry to prevent scale and corrosion.

Gas Connections

Natural gas or propane connection requirements.

Use approved gas pipe and fittings for fuel type.
Install manual shut-off valve within 6 feet of heater.
Verify gas pressure: Natural gas 7" WC, Propane 11" WC.
Pressure test all connections before operation.
Use pipe sealant approved for gas service.

WARNING! Gas connections must be performed by licensed professional. Gas leaks can cause explosion or fire.

Electrical Connections

Standard 120V electrical requirements.

Connect to GFCI protected outlet or circuit.
Ensure proper grounding of unit.
Use weatherproof connections for outdoor installation.
Verify voltage (120V AC ±10%) at heater terminals.
Follow local electrical codes for installation.

CAUTION! Disconnect power before servicing electrical components.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Frequency	Maintenance Task
Weekly	Check water pressure gauge reading
Monthly	Inspect burner flames (blue with yellow tips)
Seasonally	Clean filter and check water chemistry
Annually	Professional inspection and service
As needed	Clean heat exchanger if scale detected

Important: Keep area around heater clear of debris and vegetation.

Safety Information

Critical safety warnings and precautions for pool heater operation.

Never operate heater without proper water flow
Keep combustible materials away from heater
Install carbon monoxide detectors in nearby living areas
Do not cover heater or block ventilation
Keep children and pets away from operating heater
Have heater serviced annually by qualified technician
Shut off gas and power before any maintenance

EMERGENCY: If you smell gas, immediately shut off gas supply, extinguish any open flames, and call gas company or fire department.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Heater won't start	Power issue/water flow	Check power connection; verify proper water flow through heater
No heat output	Gas supply/ignition	Check gas valve; verify pilot or electronic ignition operation
Error code displayed	System fault	Refer to error code chart in service manual; reset if possible
Poor heating performance	Flow rate/scale	Check filter; clean if restricted; inspect for heat exchanger scale
Unusual noises	Water flow/combustion	Check for air in system; verify proper combustion air supply
Pilot won't stay lit	Thermocouple/air flow	Check thermocouple connection; verify proper venting

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

Service: 1-800-XXX-XXXX; www.jandy.com