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Lochinvar FTxl 850 User Manual

Lochinvar FTxl 850
84 pages
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Installation & Operation Manual
Models: 400, 500, 600, 725,
& 850
is manual must only be used by a
quali ed heating installer / service
technician. Read all instructions,
including this manual and the FTXL
Service Manual, before installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
WARNING
Save this manual for future reference.
FTXL-I-O_100059358_2000005000 Rev E

Table of Contents

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Lochinvar FTxl 850 Specifications

General IconGeneral
BrandLochinvar
ModelFTxl 850
CategoryBoiler
LanguageEnglish

Summary

Please Read Before Proceeding

Safety Warnings and Precautions

Crucial safety information, warnings, and operational guidelines to prevent injury, death, or damage.

The FTXL - How it works

Heat Exchanger and Combustion System

Details components like heat exchanger, blower, gas valve, and burner for efficient combustion.

Control and Monitoring Systems

Covers sensors, LCD display, control module, and safety features for boiler management.

Connections and Ancillary Components

Describes water, gas, vent, electrical connections, and accessories like drain valve and air vent.

FTXL Boiler Ratings and Specifications

AHRI Ratings and Other Specifications

Provides detailed input/output MBH, water content, connection sizes, and vent specifications.

Determine Boiler Location

Installation Requirements and Site Selection

Covers compliance with codes, site considerations, and avoidance of hazards.

Clearances and Air Opening Requirements

Specifies clearances from combustibles and details combustion air intake requirements.

Ventilation and Combustion Air

Details requirements for air supply, preventing contamination, and venting options.

Prepare the Boiler for Installation

Boiler Removal and Gas Conversions

Guides on unpacking, pallet removal, and converting the boiler for propane fuel.

General Venting Requirements

Direct Venting Options and Materials

Explains sidewall and vertical direct venting, concentric kits, and approved materials like PVC, CPVC, Polypropylene, Stainless Steel.

Common Venting and Canadian Requirements

Details criteria for common venting FTXL boilers and installation requirements for Canada.

Sidewall Direct Venting Terminations

Sidewall Termination Location and Clearances

Provides critical guidelines for locating vent/air terminations and maintaining clearances.

Wall Penetration and Assembly

Covers preparing wall penetrations and assembling termination kits for various materials.

Vertical Direct Venting Terminations

Vertical Termination Requirements

Outlines requirements for vertical vent/air termination, including roof penetrations and clearances.

Alternate Vertical Concentric Venting

Explains using existing venting systems as chases for vent and combustion air routing.

Hydronic Piping and System Connections

System Water Piping and Components

Details system piping methods, low water cutoff, freeze protection, and near-boiler piping components.

Circulator Sizing and Flow Rates

Guides on sizing circulators and understanding flow rates based on temperature rise.

Boiler and Multiple Boiler Piping Diagrams

Provides diagrams for single and multiple boiler piping configurations, including DHW and temperature loop setups.

Gas Connections and Supply

Gas Supply Piping and Pressure Requirements

Covers installing gas piping, checking supply, pressure requirements for natural and propane gas.

Field Wiring and Electrical Connections

Line and Low Voltage Wiring

Details connections for thermostats, sensors, pumps, and control module wiring.

Condensate Disposal System

Condensate Drain and Neutralization

Explains the condensate trap, drain requirements, and use of a neutralizing filter or pump.

Boiler Start-up Procedures

Water Quality, Freeze Protection, and Gas Checks

Covers water filling, freeze protection, gas leak checks, and thermostat circuit verification.

Initial Boiler Operation and Combustion Checks

Details final checks, operating instructions, flame/combustion analysis, and setting operational parameters.

Operating Information and Control Module

Boiler Operation and Control Logic

Explains how the boiler operates, the SMART SYSTEM control module, inputs, modes, and cascade sequences.

Sequence of Operation Displays

Details the sequence of operation and corresponding display screens during different boiler states.

Control Panel and Status Displays

Control Panel Navigation and Access Modes

Guides on using the control panel, accessing user and installer modes, and saving parameters.

Understanding Status Display Screens

Explains the various status screens, their displays, and descriptions for monitoring boiler operation.

Boiler Maintenance and Annual Startup

Service Technician Procedures

Outlines annual startup tasks, inspections, and cleaning for service technicians.

Owner Maintenance and Flame Signal Checks

Details daily, monthly, and periodic maintenance tasks for the owner, including flame signal and heat exchanger cleaning.

Wiring and Control Diagrams

Wiring Diagram and Ladder Logic

Provides detailed wiring and ladder diagrams for troubleshooting and installation.

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