Amana GUC Series Owner's manual

™
®
June 1999 (2) 10318817
WARNING
To avoid death, personal injury or property
damage, do not use this furnace if any part
of the furnace has been under water.
Immediately call a qualified service
technician to inspect the furnace and to
replace any part of the control system and
any gas control having been under water.
Important Note To The Owner
It is important that you fill out the owner’s registration card
and mail it today. This will assist Amana in contacting you
should any service or warranty information change in the
future. When filling in the registration card, be sure to
includetheModel,ManufacturingandSerialNumbers,plus
the installation date. If the registration card cannot be
located,pleasecall1-800-843-0304 to register the furnace.
Yourwarrantycertificateisalsosuppliedwiththeunit.Read
the warranty carefully and note what is covered. Keep the
warranty certificate in a safe place, so you can find it, if
necessary.
Before using this manual, check the serial plate for proper
model identification.
WARNING
WARNING
If the information in these instructions is
not followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
– Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
– 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.
• Immediatelycallyourgassupplierfrom
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
–Installationandservicemustbeperformed
by a qualified installer, service agency or
the gas supplier.
WARNING
Shouldoverheatingoccurorthegassupply
fail to shut off, turn off the manual gas
controlvalvetothefurnacebeforeshutting
off the electrical supply.
THE INSTALLATION AND SERVICING OF THIS EQUIPMENT MUST BE PERFORMED BY QUALIFIED,
EXPERIENCED TECHNICIANS ONLY.
Due to policy of continual product improvement, the right is reserved to change specifications and design without notice.
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION
Amana
Fayetteville, TN 37334
GUC*, GUX*, GUD*,
GDC*, GDC*
Gas-Fired Warm Air Furnace
User's Information Manual
Affix this manual, Specification Sheet and
Installation Instructions adjacent to the furnace.

2
As a professional installer you have an obligation to
know the product better than the customer. This
includes all safety precautions and related items.
Prior to actual installation, thoroughly familiarize
yourself with this manual. Pay special attention to all
safety warnings. Often during installation or repair it is
possible to place yourself in a position which is more
hazardous than when the unit is in operation.
Remember, it is your responsibility to install the
product safely and to know it well enough to be able to
instruct a customer in its safe use.
Safety is a matter of common sense...a matter of
thinking before acting. Most dealers have a list of
specific good safety practices...follow them.
The precautions listed in this manual should not
supersedeexistingpracticesbutshouldbeconsidered
as supplemental information.
ATTENTION INSTALLING PERSONNEL
Remember to leave this manual with the homeowner.
Table of Contents
Important Note To The Owner ........................................................................................................................... 1
I. General Information..................................................................................................................................... 3
II. Operation ...................................................................................................................................................... 5
III. Maintenance ................................................................................................................................................. 8
IV. Inspection of Furnace (Qualified Servicer Only) .................................................................................... 10
V. For More Information ..................................................................................................................................11
VI. Safety Labels.............................................................................................................................................. 12

3
WARNING
To avoid personal injury or fire, minimum
clearances to combustible surfaces must
be followed.
7. Make certain the required clearances for the furnace
are always maintained. These clearances are listed on
the furnace nameplate. If any question develops, con-
tact the installer of the furnace, or another qualified
servicer.
UNIT INSTALLATION
Examine the furnace installation to determine the following:
1. The flue vent pipe is physically sound and sealed. The
vent slopes upward to vent terminal so condensate
drains back toward the furnace. The vent shows no
evidence of leaking or separation at joints or fittings.
2. The return air duct connection is physically sound,
sealed to the furnace casing, and terminates outside
the space containing the furnace.
3. The physical support of the furnace is sound without
sagging, cracks, or gaps around the base so as to
provide a seal between the support and the base.
4. There are no obvious signs of deterioration of the
furnace.
5. Check the burner flames for adjustment.
MINIMUM UNIT CLEARANCES TO COMBUSTIBLE
SURFACES (UPFLOW AND COUNTERFLOW
INSTALLATIONS)
NOTE: GDC and GCD models require special subbase
when installed on combustible (wood only) floor (CFSB16,
20 or 24).
1"
0"
1"
36"Service Area
Free Access
To Furnace
3"
A 1" Top Clearance
is also required
Figure 1
Upflow and Counterflow Clearances
(Top View)
I. General Information
This furnace is built to provide many years of safe and
dependable service, providing it is properly installed and
maintained. However, abuse and/or improper use can
shorten the life of the furnace and create hazards for you,
the homeowner.
WARNING
This product contains or produces a
chemical or chemicals which may cause
serious illness or death and which are
known to the State of California to cause
cancer, birth defects or other reproductive
harm.
WARNING
To avoid possible equipment damage,
personal injury, fire or death, the following
instructions must be observed regarding
unitlocation,airrequirementsandoperating
procedures.
UNIT LOCATION
1. The furnace area and the vicinity of any other gas
appliances must be kept clear and free of combustible
materials, gasoline, and other flammable vapors and
liquids. Also, do not store or use flammable items such
as paint, varnish, or lacquer in the area.
2. Do not store or use chlorine or fluorine products
(bleaches, cements, strippers, aerosols) near the unit.
They can corrode the heat exchanger.
3. Do not use the furnace closet as storage for brooms,
mops, brushes and oily rags or cloths. The area must
be kept clear, clean and free of lint. Furnace must be
kept free and clear of exposed or loose insulation
materials in the area of installation. Examine the fur-
nace area when the furnace or additional insulation is
added since some insulation materials may be com-
bustible.
4. Make sure the furnace is always connected to an
approved vent, in good condition, to carry combustion
products outdoors.
5. Familiarize yourself with the controls that shut off the
gas and electrical power to the furnace. If the furnace
isto beshutdown attheendoftheheatingseason,turn
offboththegas andelectricalpower.Forsafety,always
turn the gas and electrical power off before performing
service or maintenance on the furnace.
6. Establish a regular maintenance schedule to insure
efficient and safe operation of the furnace. The furnace
should be checked at the beginning of each heating
and cooling season by a qualified service technician.

4
MINIMUM UNIT CLEARANCES TO COMBUSTIBLE
SURFACES (HORIZONTAL INSTALLATIONS - GDC
ONLY)
A SIX INCH TOP CLEARANCE IS ALSO REQUIRED.
12"
0"
6"
Alcove
Left Air Discharge
12"
0"
6"
Alcove
Right Air Discharge
Figure 2
Horizontal Clearances (GDC)
AIR REQUIREMENTS
WARNING
To avoid death, personal injury or property
damage, enough fresh air for proper
combustion and ventilation of flue gases
must be provided to this furnace. Most
homes require outside air to be supplied
into the furnace area.
Improved construction and additional insulation in homes
have reduced the heat loss and made these homes much
tighter around doors and windows so that air infiltration is
minimal. This creates a problem to supply ventilation and/
or combustion air for gas fired or other fuel burning appli-
ances. Any use of appliances that pull air out of the house
(clothes dryers, exhaust fans, fireplaces, etc.) increases
this problem and appliances could be starving for air.
If fuel-burning appliances are starved for air, the flue gases
which these appliances produce as they operate may not
vent outdoors properly, but remain in the home instead.
These flue gases may include carbon monoxide.
WARNING
Death or personal injury from asphyxiation
can result from exposure to carbon
monoxide.
Carbon monoxide or “CO” is a colorless and odorless gas
produced when fuel is not burned completely or when the
flame does not receive sufficient oxygen.
Be aware of these air starvation signals which indicate
conditions that may result in carbon monoxide or that
carbon monoxide may be present:
1. Headaches-Nausea-Dizziness.
2. Excessive humidity-heavily frosted windows or a moist
“clammy” feeling in the home.
3. Smoke from a fireplace won’t draw up the chimney.
4. Flue gases won’t draw up the appliance vent pipe.
WARNING
It is vitally important that the furnace have
proper venting. GUC, GUX, GUD, GDC or
GCD model furnaces must never be
common vented with another gas fired
appliance. Any alteration to any venting
system must be in accordance with local
andnationalcodes,andthemanufacturer's
instructions.
COMBUSTION AIR (GUC, GUX, GUD, GDC AND GCD -
ONE PIPE SYSTEM)
Normally the air for combustion and ventilation can be
obtained from the surrounding unconfined space or lou-
vered closet door.
• When a furnace is installed in a closet and the closet
door is louvered DO NOT OBSTRUCT LOUVERS.
Louvers must be open and clear to provide combustion
air to the furnace.
• Whenthefurnaceisinstalledinaconfinedspacewithin
a home and the air for combustion and ventilation
enters the space through ducts from the outside...be
sure to check the entering and outlet (grilled) openings
so that they are always clear and clean.
IMPORTANT NOTE: Do not partition off a small area
around the furnace including a non louvered door. This
could obstruct the combustion air from reaching the fur-
nace.
COMBUSTION AIR (GUD AND GCD - TWO PIPE
SYSTEM)
NOTE: To insure proper operation of the furnace, both
combustion air and flue pipes must never become ob-
structed.
NOTE: The air for combustion and ventilation must not
come from a corrosive atmosphere.
WARNING
Topreventpossibledeathorpersonalinjury
due to asphyxiation, Amana Condensing
Gas Fired Warm Air Furnaces must be
Category IV vented.
Category IV venting must be gas and water tight. For
information on Category IV venting, refer to the installation
instructions available from the installing dealer, distributor,
or directly from Amana.

5
The vent system must slope toward the furnace for drain-
age of condensate. Provision must be made to drain the
condensate and protect the condensate drain trap and
drain line from freezing conditions.
WARNING
Topreventpossibledeathorpersonalinjury
due to asphyxiation, common venting with
other induced draft appliances is not
allowed. Carefully read and follow all
instructions given in this section.
NOTE: The louvers in the furnace door and top must never
be obstructed. They must remain open so air can flow
through the furnace and cool internal components.
INDOOR HUMIDITY
Relative humidity is the amount of water vapor in the air
relativetotheamounttheaircan hold at the same tempera-
ture. Example: At 40% relative humidity, the air could hold
2 1/2 times as much moisture (2.5 x 40 = 100%) before
becoming saturated.
The colder the air; the less moisture it can hold. As air is
warmed, its ability to hold moisture is increased.
Example: A winter day, outdoor temperature 10°F, and
relative humidity of 70%. If that air enters a home and is
warmed to 72°F the relative humidity will drop to 6% (very
dry) if no more moisture is added.
Relative humidity is important to your health and home as
proper humidification helps reduce respiratory difficulties
and helps improve the indoor air quality.
A good relative humidity is one just high enough to barely
start condensation along the lower edges or lower corners
of the windows. More than that can be damaging.
Frequent fogging or excessive condensation on inside
windows indicates the indoor humidity level is too high for
outdoor weather conditions. Damage to the building may
result if the condition persists. (Condensation on inside of
storm windows indicates loose inside windows. Adding
weather-stripping to tighten inside windows usually cor-
rects this problem.)
The following table shows the recommended maximum
indoor humidity in relationship to the outdoor temperatures.
Temperature
(° F.) Humidity
+20° 35%
+10° 30%
0° 25%
-10° 20%
-20° 15%
Table 1
PROPANE FURNACES ONLY
WARNING
To avoid death, personal injury or property
damage due to explosion or fire, install a
gas detecting warning device. Since the
odorant in propane gas can be reduced by
iron oxide (rust), a gas detecting warning
device is the only reliable method to detect
propane gas leaks.
WARNING
If thegasfurnaceisinstalledinabasement,
an excavated area or a confined space, it is
stronglyrecommendedtocontactapropane
supplier to install a gas detecting warning
device in case of a gas leak.
•Since propane gas is heavier than air,
any leaking gas can settle in any low
areas or confined spaces.
•Propane gas odorant may fade, making
the gas undetectable except with a
warning device.
Anundetected gas leakwillcreatea danger
ofexplosionorfire. Ifthepresenceofgas is
suspected, follow the instructions on the
cover of this manual. Failure to do so could
result in SERIOUS PERSONAL INJURY OR
DEATH.
II. Operation
THERMOSTAT
There are many types and styles of thermostats but the
operation is usually similar. BE SURE TO BECOME FA-
MILIAR WITH YOUR THERMOSTAT. The simplest type of
thermostatonly starts and stops the furnace tomaintain the
proper room temperature. The most widely used types will
control both heating and cooling functions and will have a
Fan Switch with Auto and ON settings. On Auto, the
circulating air blower will cycle on/off with the furnace but if
switched to ON it will run constantly whether or not the
furnace is on.
In addition there are thermostats that automatically switch
from Heating to Cooling and with night setbacks. The night
set-back, or multiple set-back type, will lower the tempera-
ture at night or during the day when no one is at home.