Untrained personnel can perform basic maintenance functions
described in User’s Information Manual such as cleaning and
replacing air filters. All other operations must be performed by
trained service personnel. When working on heating equipment,
observe precautions in the literature, on tags, and on labels
attached to or shipped with the unit and other safety precautions
that may apply.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Be careful of sharp metal edges, etc. Use care and wear
protective clothing, gloves, and safety glasses when removing
parts.
Follow all safety codes including the National Fuel Gas Code
(NFGC) NFPA 54-2002/ANSI Z223.1-2002 in the USA, CSA
B149.1-05 National Standard of Canada, Natural Gas and Propane
Installation Codes (NSCNGPIC) in Canada, and the Installation
Standards, Warm Air Heating and Air Conditioning Systems
(NFPA 90B) ANSI/NFPA 90B. Wear safety glasses and work
gloves. Have a fire extinguisher available during start-up and
adjustment procedures and service calls.
GENERAL
This furnace can be installed as a
direct vent (2-pipe) or
non-direct vent (1-pipe)
condensing gas furnace. These in-
structions are written as if the furnace is installed in an upflow
application. An upflow furnace application is where the blower is
located below the combustion and controls section of the furnace,
and conditioned air is discharged upward. Since this furnace can be
installed in any of the 4 positions shown in Fig. 2, you may need
to revise your orientation to component location accordingly.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
UNIT DAMAGE HAZARD
Failure to follow this caution may damage furnace compo-
nents.
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servicing to
protect the furnace electronic control. Precautions will pre-
vent electrostatic discharges from personnel and hand tools
which are held during the procedure. These precautions will
help to avoid exposing the control to electrostatic discharge
by putting the furnace, the control, and the person at the same
electrostatic potential.
1. Disconnect all power to the furnace. DO NOT TOUCH THE
CONTROL OR ANY WIRE CONNECTED TO THE CON-
TROL PRIOR TO DISCHARGING YOUR BODY’S ELEC-
TROSTATIC CHARGE TO GROUND.
2. Firmly touch a clean, unpainted, metal surface of the furnace
chassis which is close to the control. Tools held in a person’s
hand during grounding will be satisfactorily discharged.
3. After touching the chassis, you may proceed to service the
control or connecting wires as long as you do nothing that
recharges your body with static electricity (for example; DO
NOT move or shuffle your feet, DO NOT touch ungrounded
objects, etc.).
4. If you touch ungrounded objects (recharge your body with
static electricity), firmly touch furnace again before touching
control or wires.
5. Use this procedure for installed and uninstalled (ungrounded)
furnaces.
Fig. 1—Multipoise Furnace in Upflow Orientation
A05069
Fig. 2—Multipoise Orientation
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
2
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