Lennox iComfort SL280UH070V36A User Manual

Page 1
© 2016 Lennox Industries Inc.
Corp. 1116-L4
SL280UHV(X)
Service Literature
Revised 04/2020
iComfort
®
ENABLED SL280UHV(X) SERIES UNITS
SL280UHV(X) series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac
tured with Lennox Duralok heat exchangers formed of
aluminized steel. SL280UHV(X) units are available in heat
ing capacities of 66,000 to 132,000 Btuh and cooling ap
plications up to 5 tons. Refer to Engineering Handbook for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. SL280UHV(X)
model units are equipped with the iComfort
®
enabled Sur
eLight
®
two-stage variable speed integrated control.
SL280UHV(X) unit meets the California Nitrogen Oxides
(NO
x
) Standards and California Seasonal Efficiency re
quirements. All units use a redundant gas valve to assure
safety shut-off as required by C.S.A.
All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as a recom
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti
tute code.
TABLE OF CONTENTS
Specifications Page 2.............................
I Unit Components Page 5........................
II Installation Page 43.............................
III Start Up Page 43..............................
IV Heating System Service Checks Page 44.........
V Typical Operating Characteristics Page 47.........
VI Maintenance Page 48..........................
VII Wiring and Sequence of Operation Page 51......
VIII Field Wiring and Jumper Settings Page 55.......
IX Program Unit Capacity Size Mode Page 59.......
X Troubleshooting Page 60........................
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller (or equivalent), service agency or the gas sup
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.

Lennox iComfort SL280UH070V36A Specifications

General

Model	SL280UH070V36A
Type	Gas Furnace
Heating Capacity	70, 000 BTU
AFUE	80%
Weight	150 lbs
Fuel Type	Natural Gas
Brand	Lennox
Series	iComfort
Input BTU	70, 000 BTU
Output BTU	56, 000 BTU
Stages	Single Stage
Blower Type	Variable Speed
CFM	1, 200 CFM
Blower Motor Type	ECM
Warranty	10 Years

Summary

Product Specifications

Gas Heating Performance Data

Details AFUE, input/output Btuh, temperature rise, and manifold pressure.

Blower, Connections, and Electrical Specs

Covers flue size, gas pipe, wheel diameter, motor specs, voltage, and shipping weight.

Unit Components, Accessories, and Configuration

Optional Accessories and Kits

Lists cabinet, controls, filters, night service kits, and gas conversion options.

Key Unit Components

Details ignitor, flame sensor, gas valve, limits, inducer, and control box.

Configuration Guide and DIP Switches

Explains thermostat selection, blower speed settings, and DIP switch functions.

Installation, Start-Up, and Maintenance

Installation and Start-Up Procedures

Steps for initial unit setup, safety checks, and heating start-up.

Gas Piping and System Checks

Covers gas piping, pressure testing, manifold pressure, and combustion analysis.

Annual Furnace Maintenance

Routine checks for components, filters, heat exchanger, and burners.

Wiring, Sequences, and Thermostat Applications

Wiring and Sequence of Operation

Control self-check, heating, cooling, and fan operational logic.

Thermostat Wiring Applications

Wiring diagrams for icomfort Wi-Fi and conventional thermostats.

Troubleshooting, Diagnostics, and Advanced Configuration

Troubleshooting and Diagnostic Codes

Diagnostic modes, LED codes, error code lists, and motor troubleshooting.

Unit Capacity and Venting Configuration

Program unit size, multiple venting options, and blower speed adjustments.