ECR International GTH Guide

29783 R2 1/24/2003
USER’S INFORMATION
MANUAL
THESE INSTRUCTIONS
APPLY TO THE
MODEL GTH NATURAL GAS
AND LP GAS HIGH EFFI-
CIENCY (CONDENSING)
WARM AIR FURNACE.
If the information in these instructions is not followed ex-
actly, a fire or explosion may result, causing property dam-
age, personal injury or death.
FOR YOUR SAFETY
ð Do not store or use gasoline or other flammable
vapors and liquids, or other combustible materials
in the vicinity of this or any other appliance.
ð 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.
· Immediately call your gas supplier from a neighbor’s
phone, or a cellular phone from a location well away
from the building. Follow the gas supplier’s instruc-
tions.
· If you cannot reach your gas supplier, call the fire de-
partment.
· Do not re-enter the building until authorized to do so by
the gas supplier or the fire department.
ð Improper installation, adjustment, alteration, ser-
vice or maintenance can cause injury, property
damage or death. Refer to this manual.
ð Installation and service must be performed by a
qualified installer, service agency or the gas sup-
plier.
DO NOT DESTROY THIS MANUAL
Please read carefully and keep in a safe place for future reference.
This symbol indicates important Safety Related Information

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29783 R2 1/24/2003
IMPORTANT:
READ THESE INSTRUCTIONS
THOROUGHLY BEFORE ATTEMPT-
ING TO OPERATE THIS FURNACE.
This furnace has been designed to
deliver many years of efficient, de-
pendable service. With regular mainte-
nance, some of which requires the
attention of a qualified installer, service
agency or gas supplier, some of which
you may do yourself, the furnace will
operate satisfactorily over many heat-
ing seasons.
Please read this manual to familiarize
yourself with safety procedures, opera-
tion, and routine maintenance proce-
dures.
Figure 1 is provided to help identify the
components of your furnace.
IMPROPER INSTALLATION, AD-
JUSTMENT, ALTERATION, SERVICE
OR MAINTENANCE CAN CAUSE
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH
FOR ASSISTANCE OR ADDITIONAL
INFORMATION, CONSULT A QUALI-
FIED INSTALLER, SERVICE
AGENCY, OR YOUR GAS SUPPLIER.
DEVICES ATTACHED TO EITHER
THE VENT OR COMBUSTION AIR
INTAKE FOR THE PURPOSES OF
EXCEEDING THE LIMITATIONS
DESCIBED IN THE INSTALLATION
MANUAL, INCLUDING FIELD IN-
STALLED INDUCED BLOWER FANS
HAVE NOT BEEN TESTED AND ARE
NOT INCLUDED IN THE DESIGN
CERTIFICATION OF THE FURNACE.
WE, THE MANUFACTURER CAN-
NOT AND WILL NOT SPECULATE
ON THE EFFECTS OF SUCH MODI-
FICATIONS, AND CANNOT AND
WILL NOT BE RESPONSIBLE FOR
INJURY OR DAMAGE CAUSED BY
THE USE OF SUCH UNTESTED
AND/OR UNCERTIFIED DEVICES,
ACCESSORIES OR COMPONENTS.
Most natural gas systems and all LP
gas systems have a service regulator
located near the point where the gas
piping enters the building.
The propane tank will normally have an
additional first stage regulator located
at the tank outlet valve. All of these
regulators (located outdoors) will have
a vent; see Fig. 2.
It is important for these vents to remain
clear. Do not allow moisture, which
could freeze, to build up in the vent. If
you see moisture building up in the
regulator vent, contact your gas sup-
plier.
SAFETY ISSUES
FIGURE 1: FURNACE COMPONENTS
1. Combustion Air Intake Fitting
2. Flame Roll-out Switch
3. Burner Assembly
4. Gas Valve
5. Vent Drain Assembly
6. Pressure Switch - Recovery Coil
7. Pressure Switch - Induced Draft
8. Induced Blower Assembly
9. Condensate drain - Recovery Coil
10. Drain Trap Assembly
11. Control Panel / Drawer
12. Door Switch
13. Circulating Blower
14. Junction Box

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29783 R2 1/24/2003
FIGURE 2: GAS REGULATOR VENT
OBSTRUCTION OF THE AIR VENT
ON AN LP (PROPANE) CYLINDER
OR TANK REGULATOR CAN CAUSE
EXPLOSION OR FIRE RESULTING IN
PROPERTY DAMAGE, SEVERE
PERSONAL INJURY OR DEATH.
YOUR GAS SUPPLIER SHOULD PE-
RIODICALLY INSPECT AND CLEAN
THE AIR VENT SCREEN TO PRE-
VENT ANY OBSTRUCTION. KEEP
PROTECTIVE REGULATOR COVER
IN PLACE, AS EXPOSURE TO THE
ELEMENTS CAN CAUSE ICE
BUILDUP AND REGULATOR FAIL-
URE.
GENERAL SAFETY RULES
1. Combustible materials should not
be stored against or around the
furnace. Keep the furnace area
clear and free from all combustible
materials such as newspapers,
rags, cardboard, clothing, etc. This
applies especially to gasoline and
other flammable vapors and liq-
uids.
2. A furnace needs adequate
amounts of combustion and venti-
lation air to operate properly. Do
not block or obstruct air openings
on the furnace, or air openings
supplying combustion or ventila-
tion air to the area where the fur-
nace is installed. There are many
areas from which your furnace
could be receiving combustion and
ventilation air including from within
the heated area (inside air), from
outdoors, from an attic or crawl
space. If renovations are done, be
sure that air supply openings are
not inadvertently covered over with
insulation, vapor barrier, or similar
construction material.
3. All doors and panels must be in
place during normal furnace op-
eration. Attempting to operate the
furnace with missing doors or
panels could lead to the creation
of carbon monoxide gas.
4. If the furnace is installed in a con-
fined space or if you intend to build
a furnace room where insulation is
present, be aware that some insu-
lating materials are combustible.
Do not allow building insulating
materials to come into contact with
the furnace.
5. Any additions, alterations or con-
versions required in order for the
furnace to properly match the ap-
plication requirements must be
done by a qualified installation
contractor, service agency or gas
supplier, using factory specified or
approved parts.
6. Familiarize yourself with the loca-
tion of the furnace gas manual
shut-off valve and any electrical
switches , fuse or circuit breaker
associated with the furnace.
7. Should over-heating occur, or if
the gas valve fails to shut off the
burners, shut off the gas supply
with the furnace manual shut-off
valve, then shut off the electrical
supply to the furnace. In the case
of the latter, call a qualified instal-
lation contractor, service contrac-
tor, or gas supplier.
8. If the furnace has been subjected
to flood conditions, i.e., if any part
of the furnace has been under wa-
ter, call a qualified installer, ser-
vice agency or gas supplier for a
complete inspection. Electronic
controls and gas train components
may become unstable and unreli-
able. The furnace must not be
used until the furnace has been
checked, and any affected parts
have been replaced.
9. Do not allow snow, ice or debris to
accumulate around the outdoor
furnace exhaust and combustion
air intake terminals. Blockage of
the exhaust or combustion intake
terminals can result in inadequate
performance or nuisance shut-
downs.
10. Familiarize yourself with the loca-
tion of your furnace filter or filters.
A blocked air filter will reduce effi-
ciency, increase fuel consumption,
raise the furnace operating tem-
perature, and shorten the life of
furnace components.
11. Do not cover return air grills and
supply air registers with drapes,
curtains, throw rugs, etc.
12. Avoid shutting off supply air regis-
ters in the interests of saving heat.
While there is some validity to this
practice with space heating, there
is little to be gained in central
heating systems. The furnace re-
quires a quantity of air passing
over the heat exchanger to oper-
ate within design temperatures.
Reducing the number of supply air
registers available for air delivery
may have the unforeseen conse-
quence of raising the furnace op-
erating temperature, reducing fur-
nace efficiency, and shortening the
life of the furnace components.
Regulator Vent
Keep free of ice, snow
and debris.

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29783 R2 1/24/2003
During the heating season, the opera-
tion of the furnace is fully automatic.
TO START THE FURNACE:
1. First read these instructions and
safety notices thoroughly.
2. Set the thermostat to the lowest
setting.
3. Ensure that all supply air registers
and return air grilles are open.
4. Turn off the electric power to the
furnace.
5. Remove the burner access door.
6. Ensure that the appliance manual
shut-off valve is in the “ON” posi-
tion. The valve handle is normally
in-line with the gas pipe and valve
body when it is in the “ON” posi-
tion; perpendicular to the gas pip-
ing and valve body when it is in
the “OFF” position.
7. Honeywell gas valve: no action
required. White-Rodgers gas
valve: turn the manual gas control
knob to the “OFF” position (see
Fig. 5).
8. Wait 5 minutes to clear out any
gas. If, after this time you smell
gas, STOP. Turn the appliance
manual shut-off valve to the “OFF”
position. If burning propane or
other LP gas, smell for gas near
the floor since propane and butane
are both heavier than air. If after
this time you do not smell gas,
continue to the next step.
9. Honeywell gas valve: Ensure that
the “Ignition System Control
Switch” is in the “ON” position (see
Fig. 4). White-Rodgers gas valve:
turn the manual gas control knob
to the “ON” position.
Never use tools to turn the manual gas
control knob. If the control knob will not
turn by hand, do not attempt to force it.
Doing so could result in explosion or
fire resulting in serious property dam-
age, personal injury or death. Call a
qualified installation contractor, service
agency or gas supplier.
10. Replace the burner access door,
ensuring that it is properly in place.
11. Restore the electric power to the
furnace.
12. Adjust the thermostat to the de-
sired setting. If the thermostat also
controls an air conditioning sys-
tem, ensure that the thermostat
system switch is in the “HEAT” or
“AUTO” mode.
If this is the first time that the furnace
has undergone a trial ignition since
installation, or if there has been work
done on the gas lines, the furnace
might not light because of air trapped
in the gas supply line.
Simply turn the thermostat down to its
lowest setting, wait 5 minutes, then
adjust the thermostat to the desired
setting. If the problem persists, pro-
ceed to the Furnace Shut-Down Pro-
cedure and call your installer, service
agency or gas supplier.
FURNACE SHUT-DOWN
PROCEDURE
1. Set the thermostat to its lowest
setting.
2. Shut off electric power to the fur-
nace.
3. Turn the appliance manual shut-off
valve to the “OFF” position.
4. If your furnace is equipped with
the White-Rodgers gas valve, re-
move the burner access door, turn
the manual gas control knob to the
“OFF” position, then re-install the
burner access door.
If you intend to be away from home for
lengthy periods of time during the non-
heating season, it is advisable to follow
the furnace shut down procedure.
FURNACE OPERATION INFORMATION
Figure 3: Honeywell Gas Valve

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29783 R2 1/24/2003
ROUTINE MAINTENANCE BY
HOMEOWNER
AIR FILTER
DO NOT OPERATE YOUR FURNACE
(OR AIR CONDITIONER) FOR EX-
TENDED PERIODS OF TIME WITH-
OUT AN AIR FILTER.
A portion of the dust entrained in the
air may temporarily lodge in the air
duct runs and the supply registers. Any
recirculated dust particles will be
heated and charred by coming into
contact with the heat exchanger. This
residue will soil ceilings, walls, drapes,
carpets, furniture, and other household
articles.
DISCONNECT THE ELECTRICAL
POWER TO THE FURNACE BEFORE
ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO MAY CAUSE
ELECTRICAL SHOCK RESULTING IN
SEVERE PERSONAL INJURY OR
DEATH.
The furnace is supplied with a semi-
permanent 16 x 25 x 1 air filter. The
filter medium is synthetic sponge,
which allows for several cleanings be-
fore the filter requires replacement.
REMOVING FILTER
1. Disconnect electrical
power to the furnace.
2. Remove the blower
compartment access
door.
3. Lift filter out of the
bottom retainer rail,
allow the filter to
drop to the base
panel which will dis-
engage it from the
top retainer rail.
4. Pull the filter out the
front.
5. Clean or replace the
filter, then re-install
by reversing steps 1
through 3.
6. Replace blower access door.
If the filter is installed on the bottom, to
remove, follow the above guide skip-
ping step 3.
FILTER CLEANING
Vacuum the loose dirt from the filter,
then wash it using a mild detergent and
water. Please handle carefully. The
synthetic sponge medium can be eas-
ily punctured and made unsuitable for
air filtration.
ALLOW THE FILTER TO DRY THOR-
OUGHLY BEFORE RE-
INSTALLATION. NEVER OPERATE
THE BLOWER FAN WITH A WET
FILTER.
Consult your installation contractor or
service technician if you have any
questions on filters.
Figure 6: Side Positioned Filter
Figure 4: Honeywell Valve Figure 5: White-Rodgers Valve
MAINTENANCE

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29783 R2 1/24/2003
If cleaning rather than replacing the
filter, unless the filter is thoroughly
washed and dried, be sure that the
filter is re-installed with the airflow di-
rection identical to its previous use.
Reversing the filter will cause dust
trapped within the filter to break free
and recirculate within the duct system.
LUBRICATION
Minimal lubrication is required for your
furnace. The induced blower assembly
motors have sealed bearings. The
bearings contain permanent special
purpose lubricants. Attempting to force
common oil into the induced blower
motor bearings will deteriorate the
original lubricant and shorten bearing
life.
DISCONNECT ELECTRICAL POWER
TO THE FURNACE BEFORE AT-
TEMPTING TO LUBRICATE THE
BLOWER MOTOR. FAILURE TO DO
SO COULD RESULT IN SEVERE
PERSONAL INJURY OR DEATH.
The circulating fan may have perma-
nently lubricated ball bearings or
sleeve bearings. If the blower motor is
equipped with sleeve bearings, peri-
odic oiling is required. If the fan motor
runs continuously, the bearings should
be oiled yearly. If the fan runs occa-
sionally, (automatically), the bearings
may be oiled after the second year. 4 -
6 drops of SAE 20 non-detergent oil is
ideal. The oiling ports are normally (but
not necessarily) located on the outside
edge of the motor end bells. The inner
oil port is difficult to reach without a
“tele-spout” or similar type oiler. If you
cannot see an oil port, we recommend
that you leave this part of the mainte-
nance to your service contractor.
Do not use automotive motor oil,
household oil, general purpose oil, etc.
These oils will shorten the life of the
motor.
Do not over-oil the electric motor. Ex-
cess oil will shorten the life of the mo-
tor.
ROUTINE EXAMINATION
It is good practice to give a quick in-
spection of your furnace each time you
inspect or clean the air filter. Things to
check:
· Check the
furnace for
obvious signs
of deteriora-
tion.
· Check the
venting and
combustion air
piping to en-
sure that it is
still fastened
to the furnace.
It should not
sag, and
should have a
¼ inch to the
foot slope up-
wards to the
chimney or
outlet termi-
nal.
· There should be no water marks
on the floor under the venting. Wa-
ter marks may indicate a leaking
pipe joint.
· All ductwork should be secured to
the furnace, and all ductwork
should be solidly supported
throughout the heating system.
· Water should flow easily through
the condensate drain line. You
may be able to observe this while
the furnace is operating if your
condensate drain line from the
drain trap assembly terminates at
a floor drain or sump pit. If clear
plastic was used, it may yellow
with age; however, the contents
should be reasonably clear. Ex-
cess debris in the drain line may
indicate a problem which should
be referred to your service con-
tractor. If the drain lines are
opaque, your service technician
will check them during the annual
servicing.
· The gas burner should be ob-
served from time to time during the
heating season to ensure that the
flames are clean and blue. A bit of
orange color in the flame is not
likely to be a problem and is
probably dust particles burning. If
you observe lazy yellow flames,
call your heating or service con-
tractor immediately. The yellow
flames inevitably lead to soot-ups.
FURNACE APPEARANCE
The furnace exterior finish is a durable
automotive like coating. It may be
washed with mild soap if necessary.
Galvanized metal surfaces require no
maintenance.
CLEANING
It is advisable to keep dust build-up on
warm surfaces to a minimum, since
dust, in some cases, can be a combus-
tible.
Dust build-up in the circulating fan can
impair blower performance; therefore,
reduce efficiency.
The recovery coil is located immedi-
ately above the blower assembly. Over
time, it may become coated with dust.
Steps to clean the recovery coil:
1. Disconnect electrical power to the
furnace.
Figure 7: Recovery Coil Access

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29783 R2 1/24/2003
2. Remove the blower access door
3. Remove the screws fastening the
blower assembly to the blower di-
vision panel.
4. Pull the blower assembly out.
5. Once the blower assembly has
been removed, the coils may be
vacuumed with the soft brush at-
tachment, (see Figure 7).
Be careful not to bend the fins
when cleaning. You may wish to
leave this maintenance procedure
to your service technician.
6. Match up the blower rails with the
hangers on the underside of the
blower division panel, then slide
the blower assembly back into po-
sition
7. Replace the screws fastening the
blower assembly to the blower di-
vision panel.
8. Replace the blower access door.
9. Restore electrical power to the
furnace.
Routine cleaning the interior of the
recovery coil should not be necessary.
If evidence develops indicating that a
cleaning is necessary, it should be
done by a trained and qualified service
technician. Evidence may include large
amounts of dirt or debris building up in
the condensate drain line.
The burner area should be inspected
and cleaned periodically. Be careful
when cleaning around the burner area.
The hot surface igniter is fragile and
will break easily. Do not touch the hot
surface igniter or flame rod
NEVER ATTEMPT TO CLEAN THE
BURNER AREA WHILE THE BURN-
ERS ARE OPERATING. DOING SO
MAY RESULT IN EXPLOSION OR
FIRE RESULTING IN SEVERE PER-
SONAL INJURY OR DEATH.
ALWAYS DISCONNECT THE ELEC-
TRICAL SUPPLY TO THE FURNACE
BEFORE REMOVING THE BURNER
COMPARTMENT ACCESS DOOR.
The furnace gas train is designed to
operate as a sealed unit. Be sure that
the burner compartment access door is
properly in place before attempting to
restart the furnace.
The furnace achieves its high efficiency
in three general areas. First, there is
no wasteful standing pilot. The furnace
consumes no gas in between cycles.
Secondly, the furnace is designed to
allow very small amounts of excess air
in the combustion process. Older fur-
naces had heat exchangers which
were commonly 40% larger than nec-
essary for complete combustion. While
this prevented the creation of carbon
monoxide, the heated excess air was
expelled up the chimney where it could
not benefit the interior of the home.
Special safety controls now prevent the
formation of carbon monoxide.
The third general area is the recovery
of the latent heat contained in the flue
gas, which is comprised of water vapor
and carbon dioxide. By condensing the
flue gas in the furnace recovery coil,
heat that would otherwise be wasted to
the outdoors, is captured and redi-
rected into the duct system where it
contributes to home comfort. Each
pound of condensation formed re-
leases approximately 970 BTU’s Your
furnace may condense up to ½ gallon
(5 pounds) of water per hour if running
continuously.
This condensation must be properly
disposed into a sump or drainage sys-
tem. The condensate lines must re-
main clear and free flowing. Do not
allow plastic drain lines to become
pinched or kinked. A blocked drain line
can cause the furnace to operate errat-
ically, or not at all.
IMPORTANT
Your furnace should be cleaned and
inspected annually by a trained and
qualified service technician.
Your service technician has the knowl-
edge and test equipment to determine
the condition of your furnace.
SEQUENCE OF OPERATION
1. Thermostat, responding to cool
room, calls for heat.
2. Combustion air blower begins.
3. After 15 second pre-purge, hot
surface igniter warms up. (Its glow
can be seen through burner com-
partment sight glass.
4. After approximately 5 seconds, the
gas valve will open, burners ignite.
5. Thirty seconds after the burners
ignite, the main blower starts on
the heating speed.
6. System remains in this state until
the room air temperature rises
causing the thermostat to termi-
nate its call for heat.
7. The gas valve shuts off; the burn-
ers extinguish.
8. After brief post-purge period, (5
seconds), the combustion air fan
stops. The main blower continues
to run.
9. Approximately 2 minutes after the
burners extinguish, the main
blower stops. Elapse time ranges
from 60 seconds to 150 seconds,
depending on the installer’s ad-
justments.
10. The furnace remains idle until the
next call for heat.
VARIATIONS
If your system includes air condition-
ing, your thermostat (supplied by the
installer) will likely have two switches.
The first switch is the system switch.
The switch settings usually include
HEAT, COOL, and OFF. Some ther-
mostats have system switches which
include HEAT, COOL, AUTO, and
OFF. The system switch must be in the
HEAT or AUTO position for the furnace
to run.
The second switch is the fan switch. It
usually has settings of ON and AUTO.
The fan switch may be in either posi-
tion when using the furnace. If the fan
switch is set to ON, the main blower
will run continuously, and the blower
delays mentioned in the sequence of
operation points 5 and 9 will be ig-
nored.

8
Home Owner Information
To help remember important information,
Please fill in the chart below:
Model No.:
Serial No.:
Installer:
Address:
City:
Postal Code:
Telephone Numbers
Installer:
Serviceman:
After Hr. Phone:
Fuel Supplier:
6800 Base Line, Wallaceburg, Ontario, N8A 5E5, Can. Tel: [phone] Fax: [phone]
2201 Dwyer Avenue, Utica, New York, 13504, USA. Tel: [phone] Fax: [phone]
85 Middle Road, Dunkirk, New York, 14048, USA. Tel: [phone] Fax: [phone]
www.ecrinternational.com