Lennox ML296UH070XV36B - User Manual

Page 1
© 2019 Lennox Industries Inc.
Corp. 1903-L1
ML296UHV(X)
Service Literature
ML296UHV(X) SERIES UNITS
ML296UHV(X) series units are 90% efficiency gas fur
naces used for upflow or horizontal applications only,
manufactured with Lennox Duralokt heat exchangers
formed of aluminized steel. ML296UHV(X) units are avail
able in heating capacities of 44,000 to 132,000 Btuh and
cooling applications 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. ML296UHV(X)
unit meets the California Nitrogen Oxides (NO
x
) Standards
and California Seasonal Efficiency requirements. All units
use a redundant gas valve to assure safety shut-off as re
quired 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.............................
Blower Data Page 3..............................
I Unit Components Page 9........................
II Installation Page 21.............................
III Start Up Page 43..............................
IV Heating System Service Checks Page 44.........
V Typical Operating Characteristics Page 47.........
VI Maintenance Page 47..........................
VII Wiring and Sequence of Operation Page 50......
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.

Summary

I- Unit Components

A- Control Box

3. Integrated Control (A92)

Information on the integrated control board, its features, and fault code history.

C- Heating Components

1. Ignitor

2. Flame Sensor

3. Gas Valve

4. Flame Rollout Switches (S47)

Explanation of the flame rollout switch, its function, location, and trip point.

6. Primary Limit Control (S10)

Details about the primary limit control, its function, reset, and temperature settings.

II- Placement and Installation

Venting Practices

Vent Termination Clearances for Non-Direct Vent Installations in the US and Canada

Vent Termination Clearances for Direct Vent Installations in the US and Canada

Condensate Piping

Condensate Trap and Plug Locations

III- Start-Up

A- Preliminary and Seasonal Checks

B- Heating Start-Up

Detailed instructions for safely initiating heating operation, including gas safety and burner ignition.

Gas Valve Operation (Figure 49)

Steps for operating the gas valve, including safety precautions and switch settings.

IV- Heating System Service Checks

B- Gas Piping

C- Testing Gas Piping

Procedures for testing gas lines, including safety measures and pressure considerations.

D- Testing Gas Supply Pressure

Steps to measure and verify the gas supply pressure at the unit's inlet.

VII- Wiring and Sequence of Operation

Lennox ML296UH070XV36B Specifications

General

Brand	Lennox
Model	ML296UH070XV36B
Category	Furnace
Language	English