Lennox SL280UH060NV36A User Manual

Page 1
UNIT INFORMATION
UNIT INFORMATION
Service Literature
©2017 Lennox Industries, Inc.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
SL280UHNVseries units are 80% effi ciency gas furnac-
es used for upfl ow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. SL280UHNV units are available in
heating capacities of 40,000 to 100,000 Btuh and cooling
applications up to 5 tons. Refer to Engineering Handbook
for proper sizing.
Units are approved for installations up 4500 ft and facto-
ry equipped for use with natural gas only. SL280UHNV
model units are equipped with the iComfort® enabled
SureLight® two-stage variable speed integrated control.
SL280UHNV unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal Effi ciency re-
quirements. All units use a redundant gas valve to assure
safety shut-off as required by C.S.A.
All specifi cations in this manual are subject to change.
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.
SL280UHNV
Corp 1601-L8
ICOMFORT
®
-ENABLED SL280UHNV SERIES UNITS
Contents
I-Unit Components..........................................................4
Blower Data ..................................................................16
II-Placement and Installation ........................................31
III-Start-Up .................................................................... 31
IV-Heating System Service Checks ..............................32
V-Typical Operating Characteristics .............................34
VI-Maintenance ............................................................35
VII- Wiring and Sequence of Operation ........................38
VIII- Field Wiring With Conventional Thermostat ..........42
IX- Program Unit Capacity Size Modes ........................46
X- Troubleshooting .......................................................47

Lennox SL280UH060NV36A Specifications

General

Brand	Lennox
Model	SL280UH060NV36A
Category	Air Conditioner
Language	English

Summary

SPECIFICATIONS

I-Unit Components

A- Control Box Functions

Details the transformer, circuit breaker, and integrated control within the unit's control box.

INTEGRATED CONTROL CONFIGURATION GUIDE

DIP Switch Settings Overview

Guide for configuring the integrated control via DIP switches for various functions.

Integrated Control Diagnostic Modes

Program Unit Capacity/Size Mode

How to program the unit's capacity or size using the control interface.

C- Heating Components

Ignitor Information

Information about the SureLight ignitor, its voltage, and resistance values.

Flame Sensor Functionality

Location and function of the flame sensor for monitoring burner ignition.

Gas Valve Operation and Safety

Details the redundant gas valve, its connections, and safety features.

Burner and Orifice Details

Information on burner adjustment, orifice types, and replacement procedures.

Heating Components (Continued)

III-Start-Up

Heating Start-Up Procedure

Step-by-step guide for initiating heating operation safely.

Heating System Service Checks (Continued)

Proper Combustion and Gas Flow

Guidelines for ensuring proper combustion performance and checking gas flow rate.

V-Typical Operating Characteristics

Blower Operation and Adjustment

How the blower operates based on thermostat settings and adjustments.

VI-Maintenance

Annual Furnace Maintenance Checklist

Comprehensive checklist for annual furnace inspection and servicing by a professional.

Maintenance (Continued)

VII- Wiring and Sequence of Operation

Applications Using a Two-Stage Thermostat

Explains heating sequence with a two-stage thermostat and DIP switch settings.

Applications Using A Single-Stage Thermostat

Details heating sequence for single-stage thermostats and DIP switch configurations.

VIII- Field Wiring With Conventional Thermostat

Field Wiring With Conventional Thermostat (Continued)

Dual Fuel Single Stage Heat Pump Wiring

Wiring and on-board link configuration for dual fuel single-stage heat pumps.

Dual Fuel Two Stage Heat Pump Wiring

X- Troubleshooting

Heating Sequence of Operation Flowchart

Flowchart detailing the sequence of operation for heating calls.

Troubleshooting (Continued)

Heating Sequence of Operation (Continued)

Flowchart illustrating the call for heat satisfaction process.

Cooling Sequence of Operation Flowchart

Flowchart detailing the sequence of operation for cooling calls.

Continuous Fan Sequence of Operation Flowchart

Flowchart illustrating the sequence for continuous fan operation.