LF25 Unit Heater

Designed for Exceptional Performance

Awards

Features
Product Documentation

Features

Designed for exceptional performance
Two-stage LF25 now available in 250-400 kBtuh!
Up to 83.8% thermal efficiency
25% less pure tones and projections than leading competitors
Easy to install with compact units offering 180-degree installation capabilities
Hinged access doors
Dimpled tubular heat exchanger design
Additional advanced features include DSI board with 11 diagnostic codes and LED FDD capabilities
Residential heating capacities from 30,000 to 105,000 BTU/h
Commercial heating capacities from 30,000 to 400,000 BTU/h
Vertical units available with either aluminized or stainless steel heat exchangers

180-degree installation position capability on compact models
Cage-nuts for all-thread installation on vertical units
Conveniently located gas connections
Removable terminal block for line voltage and thermostats
Hinged door allows easy access to all components
DSI control board has 11 diagnostic codes and remote LED fault detection diagnostics enabled
Each unit is factory wired and tested with complete cycles of startup and shutdown before being shipped

Product Documentation

English

410A Commercial Reference Guide

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Lennox Unit Heater Brochure

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LF/LS25 Unit Heater Brochure

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Expanded Sound Data

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LF25 (125K - 400K)

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LF25 Compact (30K-105K)

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Discharge Nozzle - LF25 Unit Heater - Spinnaker - 18K66-68 + See entry screen

English

Ignition Control Repl. -- Unit Heaters /UHCM-250/400KBtuh Unit Heaters

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LED Kit -- LF25 Unit Heaters

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LF25 Unit Heater (030-400KBtuh)

French Canadian

LF25 Unit Heater (030-400KBtuh) - French/francais

English

LP Kit -- LF/LS25-250/400KBtuh Unit Heaters

English

LP Kit -- LF25-030/105KBtuh Compact Unit Heaters

French Canadian

LP Kit -- LF25-030/105KBtuh Unit Heaters -- French/francais

French Canadian

LP Kit -- LF25-125/200KBtuh Unit Heaters - French/francais

French Canadian

LP Kit -- LF25-250/400KBtuh Unit Heaters - French/francais

English

LP Kit -- LF25/LS25-125/200KBtuh Unit Heaters

English

LP to Natural Gas Conversion Kit -- LF25/UHCM-125/200KBtuh Unit Heaters

French Canadian

LP to Natural Gas Conversion Kit -- LF25/UHCM-125/200KBtuh Unit Heaters - French/francais

English

LP to Natural Gas Conversion Kit -- LF25/UHCM-250/400KBtuh Unit Heaters

French Canadian

LP to Natural Gas Conversion Kit -- LF25/UHCM-250/400KBtuh Unit Heaters(French/francais)

English

LP to Natural Gas Conversion Kit -- LF25/UHRS-030/105KBtuh Compact Unit Heaters

French Canadian

LP to Natural Gas Conversion Kit -- LF25/UHRS-030/105KBtuh Compact Unit Heaters - French/francais

English

Orifice Repl. Kit -- LF25-45 Compact Unit Heaters

French Canadian

Orifice Repl. Kit -- LF25-45 Compact Unit Heaters -- French/francais

English

410A Commercial Wall Chart

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Blower Bearings Set Screw

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Economizer Benefits to Commercial Buildings

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Economizer Control Types

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Economizer Settings-Modulating Damper Actuator DIP Switch

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Economizers Overview

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Basic Limited Warranty - Merit

French Canadian

Basic Limited Warranty - Merit - French

English

Basic Limited Warranty Commercial Equipment

French Canadian

Basic Limited Warranty Commercial Equipment-French/francais

English

LF25 Unit Heater 030k-105k BTUH

English

LF25 Unit Heater 250k - 400k BTUH

PACKAGED SYSTEMS

SPLIT SYSTEMS

DUCTLESS SYSTEMS

COMMERCIAL CONTROLS

INDOOR AIR QUALITY

HEATING

Emergency Replacement

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Standard Warranty

Extended Warranty

Literature

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LF25 Unit Heater

Designed for Exceptional Performance

Features

Product Documentation

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LF25 Unit Heater

Designed for Exceptional Performance

Features

Overview

Serviceability

Product Documentation

Brochure

Engineering Handbook

Installation Instructions

Quick Reference Guide

Tech Training

Warranties

Wiring Diagrams

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