12
12
GENERAL INFORMATION
READ AND FOLLOW ALL
INSTRUCTIONS IN THIS SECTION.
FAILURE TO PROPERLY VENT
THIS FURNACE CAN CAUSE
CARBON MONOXIDE POISONING
OR AN EXPLOSION OR FIRE,
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.
This furnace removes both sensible
and latent heat from the combustion
flue gases. Removal of latent heat
results in condensation of flue gas
water vapor. This condensed water
vapor drains from the secondary heat
exchanger and out of the unit into a
drain trap.
When installed as a non-direct vent
furnace, only exhaust piping is
required and inside combustion air
may be used. Refer to section on
“
COMBUSTION & VENTILATION AIR
FOR FURNACE INSTALLATIONS.”
Direct vent installations require a
dedicated combustion air and venting
system. All air for combustion is taken
from the outside atmosphere and all
combustion products are discharged
to the outdoors.
The combustion air and vent pipe
fittings must conform to American
National Standards Institute (ANSI)
and American Society for Testing
Materials (ASTM) standards
D1785 (Schedule 40 PVC), D2665
(PVC-DWV), D2241 (SDR-21 and
SDR26-26 PVC), D2661 (ABS-DWV)
or F628 (Schedule 40 ABS-DWV).
NOTE: Cellular core PVC is also
approved for use. It must be schedule
40PVC-DWV cellular pipe
manufactured under ASTM F-891.
IMPORTANT: The plastic combustion
air and venting components are of
Schedule 40 PVC. If using ABS
piping, ensure that the solvent
cement is compatible for joining PVC
to ABS components or use a
mechanical connection that can
withstand the vent temperatures and
are corrosion resistant.
NOTE: Schedule 40 ABS-DWV pipe
and fittings may be used as an
alternate to PVC pipe for the
combustion air inlet and vent pipes.
OVERTEMPERATURE
SAFETY SWITCHES
Furnaces are equipped with safety
switches in the control compartment
to protect against overtemperature
conditions caused by inadequate
combustion air supply. The switches
for the upflow and downflow models
are located in the burner
compartment. If a switch is tripped it
must be manually reset.
DO NOT JUMPER THESE
DEVICES! IF ONE OF THESE
SWITCHES SHOULD TRIP, A
QUALIFIED INSTALLER, SERVICE
AGENCY OR THE GAS SUPPLIER
MUST BE CALLED TO CHECK
AND/OR CORRECT FOR
ADEQUATE COMBUSTION AIR
SUPPLY. DO NOT RESET THE
SWITCHES WITHOUT TAKING
CORRECTIVE ACTION TO ASSURE
THAT AN ADEQUATE SUPPLY OF
COMBUSTION AIR IS MAINTAINED
UNDER ALL CONDITIONS OF
OPERATION. FAILURE TO DO SO
CAN RESULT IN CARBON
MONOXIDE POISONING OR
DEATH. IF THIS UNIT IS MOUNTED
IN A CLOSET, THE DOOR MUST
BE CLOSED WHEN MAKING THIS
CHECK.
REPLACE THESE SWITCHES
ONLY WITH THE IDENTICAL
REPLACEMENT PART.
EXISTING VENT SYSTEMS
When the installation of this furnace
replaces an existing furnace that is
VENTING AND COMBUSTION AIR PIPING
!
WARNING
!
WARNING
4. Connect the furnace to the
supply air plenum.
5. Connect the return air ducting to
the return air opening at the top
of the unit. Make the connection
air tight to prevent entraining
combustion gases from an
adjacent fuel-burning appliance.
6. Be sure to have adequate
space for the unit filter.
NOTE: DO NOT take return air
from bathrooms, kitchens,
furnace rooms, garages, utility or
laundry rooms, or cold areas.
HORIZONTAL UNIT
IMPORTANT: This furnace may only
be installed so as when facing the
front of the furnace, supply air is
discharged on the left hand side.
1. Position the unit to minimize long
runs or runs with many turns and
elbows.
2. If summer air conditioning is
desired, position the indoor coil
on the left end of the unit. Insure
that no air can bypass this coil.
3. Connect the furnace to the
supply air plenum.
4. Connect the return air ducting to
the return air opening at the right
end of the unit. Make the
connection air tight to prevent
pulling combustion gases from
an adjacent fuel-burning
appliance.
5. Be sure to have adequate
space for the unit filter.
NOTE: DO NOT take return air
from bathrooms, kitchens,
furnace rooms, garages, utility or
laundry rooms, or cold areas.
FIGURE 9
NON-COMBUSTIBLE FLOOR BASE
VENTING AND COMBUSTION AIR PIPING
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