Unitary products group PxDU series, G8D-UH, L8D-UH, PxDD series, G8D-DN Owner's Manual

CONTENTS

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HOW YOUR GAS FURNACE WORKS. . . . 2

OWNER’S MANUAL

TWO STAGE

MID - EFFICIENCY

GAS-FIRED FURNACES

UPFLOW/HORIZONTAL MODELS: P*DU / G8D-UH / L8D-UH

DOWNFLOW MODELS: P*DD / G8D-DN

KEEP THE FURNACE AREA CLEAR . . . . .2

START-UP AND SHUTDOWN GENERAL

INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . .2

FOR YOUR SAFETY, READ BEFORE

OPERATING: . . . . . . . . . . . . . . . . . . . . . . . .2

WHAT TO DO IF YOU SMELL GAS: . . . . . .2

LIGHTING INSTRUCTIONS . . . . . . . . . . . . .2

SHUTDOWN INSTRUCTIONS . . . . . . . . . . .3

YOUR FURNACE'S FILTER -

WHAT IT DOES . . . . . . . . . . . . . . . . . . . . . . 3

FREQUENCY OF CHECKING FILTERS . . .3

LOCATING / REMOVING FILTERS . . . . . . .3

HOW TO CLEAN YOUR

FURNACE'S FILTER . . . . . . . . . . . . . . . . . .4

MOTOR LUBRICATION . . . . . . . . . . . . . . . .4

WARNING: If the information in this manual is not
followed exactl

, a fire or explosion may result causing

erty damage, personal injury or loss of life.

- Do not store or use
and li

uids in the vicinity of this or any other appliance.

asoline or other flammable vapors

- WHAT TO DO IF YOU SMELL GAS

• Do not tr

• Do not touch an

to light any appliance.

electrical switch; do not use any

hone in your building.

• Im mediat e ly call your gas supplier from a neighbor’s

hone. Follow the gas supplier’s instructions.

INSTALLATION & MAINTENANCE

INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . .4

• If you cannot reach your gas supplier , call the fire

artment.

de

- Installation and service must be
fied installer, service a

ency or the gas supplier.

erformed by a quali-

035-14396-000 REV B (4/00)

035-14396-000 REV B (4/00)

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ongratulations . . .

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On your purchase of one of the most versatile furnaces available in the industry today. This compact, energy-efficient furnace
has been precision designed, manufactured of high-quality materials and has passed many rigorous inspections and tests to
ensure many years of satisfactory service. This booklet is meant to increase your understanding of your unit, tell you how to
operate it efficiently and how to obtain the greatest measure of comfort at the lowest operating e xpense. Please read this book­let thoroughly. We appreciate your interest in our product and your decision to purchase our furnace. Enjoy your comfort.

HOW YOUR GAS FURNACE WORKS

Your furnace is a very easy appliance to
take for granted. Season after season, it sits
there in your home, keeping you warm and
comfortable. For this reason, you may never
have given much thought to the way your
furnace operates. In order to get the safest
and most efficient operation from your fur­nace, though, you should understand how
your furnace does its job.

When you set your thermostat to provide
more heat in your home, you are starting the
heating cycle of the furnace. First, the
inducer motor starts to purge the heat
exchanger of any remaining gasses. Next,
the hot surface ignitor glows and after a
warm-up period the gas valve opens and
ignition occurs. A short time later the blower
starts and distributes the warm air through­out the home. When the temperature set on
your thermostat is reached, the gas valve
closes, the main burners are turned off, and
the blower continues to run until the remain­ing warm air in the system is distributed.
When the blower stops, the heating cycle
has ended.

KEEP THE FURNACE AREA CLEAR
NEVER

nace as a storage area for items which
could block the normal flow of air. This flow
of air is required for ventilation of the various
furnace components.

NEVER

any kind near your furnace. Gasoline, sol­vents, and other volatile liquids should be
stored only in approved containers outside
your home. These materials vaporize easily
and are extremely dangerous.

. . . use the area around your fur-

Do not block or obstruct air openings:

1. On the furnace.

2. Air openings communicating with the
air in which the furnace is installed.

3. The spacings around the furnace.

. . store flammable materials of

NEVER

your furnace. Materials such as bleaches,
detergents, powdered cleansers, etc., can
cause corrosion of the heat exchangers.

. . .store cleaning materials near

Insulating materials may be flammable.

When a furnace is installed in an attic or
other insulated space, or if insulation is
added, examine the furnace area to
ensure that the furnace is kept clear and
free of insulation.

START-UP AND SHUTDOWN
GENERAL INSTRUCTIONS

Read and follow these procedures CARE­FULLY and COMPLETELY.

Before attempting to start your furnace,
always do the following things FIRST:

• Turn the thermostat OFF.

• Open windows or make other provi­sions to ventilate the area around the
furnace.

• If the blower is running, wait until it
shuts off automatically.

• Turn off all electrical power to the fur­nace.

• Make sure all metal surfaces of the fur­nace have cooled to room temperature
before beginning.

FOR YOUR SAFETY, READ BEFORE
OPERATING:

If

ou do not follow these instructions
exactly, a fire or explosion may result,
causin

property damage, personal

or loss of life.

injur

A. This appliance does not have a pilot. It

is equipped with an ignition device

which automatically lights the burners.
Do not try to light the burners by hand.

B. BEFORE OPERATING, 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.

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electrical switch; do
not use any phone in your building.

• Extinguish any open flame

• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.

• If you cannot reach your gas supplier,
call the fire department.

• Use only your hand to turn the gas con­trol k n o b . Ne ve r u se too ls . If th e k n o b
will not turn by hand, don't try to repair it.
Call a qualified service technician. Force
or attempted repair m ay result in a fire or
explosion.

Do not use this furnace if any part has
been under water. Immediately call a qual­ified service technician to inspect the fur­nace and to replace any part of the control
s

stem and any gas control which has

been underwater.

LIGHTING INSTRUCTIONS

1. STOP! Read all preceding safety
information.

2. Set the thermostat to lowest setting.

3. Turn off all electrical power to the
appliance.

4. This furnace is equipped with an
ignition device which automatically
lights the burners. Do not
the burners by hand.

5. Remove the control access panel.

6. Turn gas control switch to "OFF".

try to light

2 Unitary Products Group