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Lochinvar FTxl 400 User Manual

Lochinvar FTxl 400
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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 400 Specifications

General IconGeneral
BrandLochinvar
ModelFTxl 400
CategoryBoiler
LanguageEnglish

Summary

Please Read Before Proceeding

Determine Boiler Location

Provide Air Openings to Room

Requirements for air openings to ensure adequate ventilation for the boiler room.

Vent and Air Piping

General considerations for routing vent and air piping.

Prevent Combustion Air Contamination

Methods to avoid contaminants in the combustion air supply.

Combustion and Ventilation Air Requirements

Details requirements for combustion and ventilation air for appliances in an equipment room.

Prepare Boiler

Gas Conversions

Procedures for converting the boiler for natural gas or propane.

General Venting

Direct Venting Options - Sidewall Vent

Instructions for sidewall venting configurations.

Direct Venting Options - Vertical Vent

Instructions for vertical venting configurations.

Install Vent and Combustion Air Piping

Detailed instructions for installing vent and combustion air piping systems.

Installing Vent and Air Piping

Procedures for installing vent and air piping using specific materials.

Sidewall Direct Venting

Vent/Air Termination – Sidewall

Instructions for terminating sidewall vent and air pipes.

Sidewall Termination – Optional Concentric Vent

Specific instructions for installing optional concentric sidewall vents.

Vertical Direct Venting

Vent/Air Termination – Vertical

Instructions for terminating vertical vent and air pipes.

Vertical Termination – Optional Concentric Vent

Specific instructions for installing optional concentric vertical vents.

Alternate Vertical Concentric Venting

Instructions for using existing venting systems as a chase for concentric venting.

Hydronic Piping

Low Water Cutoff Device

Information on the boiler's low water cutoff safety feature.

Gas Connections

Connecting Gas Supply Piping

Instructions for connecting the boiler to the gas supply.

Natural Gas

Specifics for natural gas connections, sizing, and pressure requirements.

Propane Gas

Specifics for propane gas connections, sizing, and pressure requirements.

Check Inlet Gas Supply

Procedures for verifying the gas supply to the boiler.

Field Wiring

Condensate Disposal

Start-up

Fill Water

Procedures for filling the boiler with water and checking its quality.

Fill and Test Water System

Steps for filling the system with water and testing for leaks.

Purge Air from Water System

How to remove air from the hydronic system.

Check Thermostat Circuits

Verifying thermostat wiring and connections.

Final Checks Before Starting the Boiler

A checklist of critical checks before initiating boiler operation.

Check System and Boiler

General checks of the boiler and associated piping.

Check Water Piping

Verifying for leaks in the water piping system.

Check Vent Piping and Air Piping

Inspecting vent and air piping for integrity.

Check Gas Piping

Procedures for checking the gas piping connections.

Check Flame and Combustion

Procedures for analyzing burner performance and combustion.

Set Space Heating Operation

Configuring boiler operation for space heating.

Set Domestic Hot Water (DHW) Operation

Configuring the boiler for domestic hot water heating.

Operating Information

Protection Features

Describes safety features related to temperature and voltage.

High Limit Operations

How high limit settings protect the boiler.

Low Water Cutoff Protection

How the boiler prevents operation with low water.

Cascade

Wiring and controlling multiple boilers together.

Sequence of Operation

Detailed step-by-step process of boiler operation during a call for heat.

Maintenance

Service Technician

Tasks for qualified service technicians during annual startup.

Address Reported Problems

How to handle and correct reported issues.

Check All Piping for Leaks

Verifying all piping for leaks and their correction.

Flue Vent System and Air Piping

Inspecting the flue vent and air piping for issues.

Check Water System

Verifying the proper installation and operation of the water system.

Check Boiler Relief Valve

Inspecting and testing the boiler's relief valve.

Perform Start-up and Checks

Executing the startup procedure and checks.

Check Burner Flame

Inspecting the burner flame for proper operation.

Check Flame Signal

Ensuring the flame signal is within acceptable limits.

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