Lenox EL195UH User Manual

E 2010 Lennox Industries Inc.

Dallas, Texas, USA

506597−01
11/2010

EL195UH

SERIES

GAS FURNACE

FIRE OR EXPLOSION HAZARD.

Failure to follow safety warnings exact­ly could result in serious injury, death,
or property damage.

Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other ap­pliance.

Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.

Litho U.S.A.

WARNING

WHAT TO DO IF YOU SMELL GAS:

D Do not try to light any appliance.
D Do not touch any electrical switch; do not

use any phone in your building.

D Leave the building immediately.
D Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s
instructions.

D If you cannot reach your gas supplier, call

the fire department.

11/10

*2P1110*

506597−01

*P506597-01*

EL195UH Parts Identification

TOP CAP

FLUE

COLLAR

ACCESS PANEL

COMBUSTION AIR

INDUCER

DURALOK

EXCHANGER

ASSEMBLY

AIR INTAKE COLLAR

BURNERS

GAS VALVE AND

PRESSURE SWITCH

ASSEMBLY

TM

HEAT

MANIFOLD

INTEGRATED

CONTROL

FIGURE 1

NOTE − This manual is the property of the homeowner
and must be left with the equipment user.

Notice to Homeowner

This furnace is equipped with safety devices that protect
you and your property. If one or more of these devices is
activated, furnace operation will stop. If your home is left
unattended for an extended period of time, equipment op­eration must be checked periodically. If this is not possible,

BLOWER

MOTOR

the water supply to the house should be shut off and the

pipes should be drained. This will prevent problems associ-

ated with a NO HEAT condition (frozen pipes, etc.)

CAUTION

Before attempting to perform any service or mainte­nance, turn the electrical power to unit OFF at the
disconnect switch.

Page 2

WARNING

Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.

WARNING

If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the furnace before
shutting off electrical supply.

WARNING

Do not use this furnace if any part has been under­water. A flood−damaged furnace is extremely dan­gerous. Attempts to use the furnace can result in
fire or explosion. Immediately call a licensed pro­fessional service technician (or equivalent) to in­spect the furnace and to replace all gas controls,
control system parts, and electrical parts that have
been wet or to replace the furnace, if deemed neces­sary.

NOTICE

Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the ap­plication needs must be made by a licensed profes­sional installer (or equivalent) using factory−speci­fied and approved parts.

Safety Instructions

1 − Keep the furnace area clear and free of combustible

material, gasoline, and other flammable vapors and
liquids. If it is installed in an insulated area, the furnace
must be kept free of insulating material. Insulating ma­terial may be combustible.

2 − After any heavy snow, ice or frozen fog event, the fur-

nace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may
be obstructing the plastic intake or exhaust pipes.

3 − DO NOT obstruct air flow to unit. Unit must receive an

unobstructed flow of combustion and ventilating air.
DO NOT block or obstruct air openings on the furnace
or air openings to the area in which the furnace is
installed. Take care to maintain established clear­ances surrounding the furnace.

4 − DO NOT store chlorine or fluorine products near unit

or introduce these products into the combustion air.
These products can cause furnace corrosion.

5 − DO NOT draw return air from a room where this fur-

nace, or any other gas appliance (ie., a water heat­er), is installed. When return air is drawn from a room,

a negative pressure is created in the room. If a gas ap­pliance is operating in a room with negative pressure,
the flue products can be pulled back down the vent
pipe and into the room. This reverse flow of the flue
gas may result in incomplete combustion and the
formation of carbon monoxide gas. This toxic gas
might then be distributed throughout the house by the
furnace duct system.

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 installer (or
equivalent), a service agency, or the gas supplier.

WARNING

The blower door must be securely in place when the
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
the living space resulting in personal injury or death.

Page 3

Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the pro­duction of carbon monoxide gas. Complete combustion of
the gas requires, but is not limited to, correct gas pressure
and gas flow rate, adequate combustion, air, and proper
venting.

WARNING

Carbon monoxide gas is invisible, odorless and
toxic.

Exposure to carbon monoxide gas can cause personal inju­ry and even death to all occupants, including pets. Any item
that is powered by or gives off heat from a combustion pro­cess (including lawn mowers, automobiles, and fireplaces)
has the potential to produce carbon monoxide gas. Because
of this, Lennox recommends the use of a carbon monox-

ide detector in your home, even if you do not own gas
appliances. Reliable detectors are available at reasonable

retail prices. Contact your Lennox dealer for more details
about this investment in your safety.

Your furnace is designed to meet standards set by nation­al agencies, and to operate safely when properly installed
and maintained. However, the unit’s performance can be
greatly impacted by the individual installation and the op­erating environment. It is your responsibility to ensure that
this appliance is maintained. Proper maintenance is criti­cal for your safety and the satisfactory operation of the
product. Lennox strongly recommends annual in-
spection and maintenance of this appliance. Contact
your Lennox dealer for an inspection by a licensed profes­sional service technician (or equivalent).

The gas valve on the EL195UH will be equipped with a
gas control switch. Use only your hand to move the
switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Call a licensed professional
service technician (or equivalent). Force or attempted re­pair may result in a fire or explosion.

Placing the EL195UH furnace into operation:

EL195UH units are equipped with an ignition system. Do
not attempt to manually light burners on this furnace.
Each time the thermostat calls for heat, the burners will
automatically light. The ignitor does not get hot when
there is no call for heat on units with this ignition system.

Operating the Gas Valve (Figure 2)

1 − STOP! Read the safety information at the beginning of

this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which

automatically lights the burners. Do not try to light the

burners by hand.
5 − Remove the upper access panel.
6 − Move switch on gas valve to OFF. See figure 2.
7 − Wait five minutes to clear out any gas. If you then smell

gas, STOP! Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s instruc-

tions. If you do not smell gas go to next step.
8 − Move switch on gas valve to ON. See figure 2.

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

DANGER

Danger of explosion.

There are circumstances in which odorant used with
LP/propane gas can lose its scent. In case of a leak,
LP/propane gas will settle close to the floor and may
be difficult to smell. An LP/propane leak detector
should be installed in all LP applications.

Do not attempt to bleed the gas lines of air. Call your
local gas provider.

Start−Up & Operation Information

WARNING

If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.

BEFORE PLACING THE UNIT INTO OPERATION, smell

all around the appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than air and will
settle on the floor.

Page 4

GAS VALVE SHOWN IN ON POSITION

FIGURE 2

9 − Replace the upper access panel.
10 − Turn on all electrical power to to the unit.
11 − Set the thermostat to desired setting.

NOTE − When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.

12 − If the appliance will not operate, follow the section

Turning Off Gas to the Unit" and call your licensed

professional service technician (or equivalent).

Turning Off Gas to the Unit

1 − Set the thermostat to the lowest setting.
2 − Turn off all electrical power to the unit if service is to be

performed.

3 − Remove the upper access panel.

4 − Move switch on gas valve OFF.

5 − Replace the upper access panel.

Filters

All EL195UH filters are installed external to the unit. Filters
should be inspected monthly. Clean or replace the filters
when necessary to ensure proper furnace operation. Re­placement filters must be rated for high velocity airflow.
Table 1 lists recommended filter sizes.
A filter must be in place when the unit is operating.

TABLE 1

Furnace

Cabinet Width

17−1/2" 16 X 25 X 1 (1) 16 X 25 X 1 (1)

21" 16 X 25 X 1 (1) 20 X 25 X 1 (1)

24−1/2" 16 X 25 X 1 (2) 24 X 25 X 1 (1)

Side Return Bottom Return

Filter Size

Maintenance

A licensed professional service technician (or equivalent)
should inspect the complete system each season (heating
and cooling). The following maintenance procedures
should only be conducted by a licensed professional ser­vice technician (or equivalent). Do not attempt to service

the unit in any way.

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or
property damage.
Improper servicing could result in dangerous opera­tion, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
When servicing controls, label all wires prior to dis­connecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.

Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger, and burners for corro­sion, deterioration, or deposits of debris. Remove any ob­structions.

Inspect the furnace for obvious signs of deterioration.

Inspect the furnace venting system to make sure it is in
place, physically sound, and without holes, corrosion, or
blockage.

Vent pipe must be clear and free of obstructions and must
slope upward away from the furnace.

Inspect the furnace return air duct connection to ensure
duct is sealed to the furnace and terminates outside the
space containing the furnace.

Inspect the physical support of the furnace to guarantee
that it is sound without sagging, cracks or gaps around
base and it maintains seal between base and support.

Inspect the condensate drain and trap for leaks and cracks.
The drain and trap must also be cleaned and the trap must
be filled with water.

During a seasonal check the service technician will con­duct a combustion analysis. The technician will also in­spect the indoor blower, burner flames, electrical connec­tions and the venting system.

Blower

Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.

WARNING

The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal inju­ry or death.

Burner Flame

Venting System

WARNING

Asphyxiation Hazard

The exhaust vent for this furnace must be leak−free
and must be securely connected to the furnace flue
collar at all times.

For your safety and to fulfill the terms of the limited
warranty, a licensed professional service technician
(or equivalent) must annually inspect this furnace
and its vent system.

CAUTION

To ensure proper operation, a licensed professional
service technician (or equivalent) should check the
burner flame and conduct a combustion analysis
annually.

Electrical

1 − Check all wiring for loose connections.
2 − Check for the correct voltage at the furnace (furnace

operating).

3 − Check amp−draw on the blower motor.

Motor Nameplate__________Actual__________

Page 5