INSTALLATION
PROCEDURES
90 Plus furnaces are design certified
to A.G.A./C.G.A. for use with natural
and propane gases as follows:
1. As central forced air furnaces
taking combustion air from the
installation area or using air
ducted from the outside.
2. As direct vent central forced air
furnaces with all combustion air
supplied directly to the burners
through a special air intake
system outlined in this manual.
Install this furnace in accordance with
the American National Standard
2223.1 - latest edition entitled
National Fuel Gas Code (NFPA-54)
and requirements or codes of the
local utilities or other authorities
having jurisdiction. Canadian
installations must be installed in
accordance with CAN/CGA B149
Installation Codes tor Gas Burning
Appliances, local installation codes
and authorities having jurisdiction.
IMPORTANT:THIS FURNACE IS
NOT INTENDED FOR USE IN A
BUILDING UNDER CONSTRUC-
TION.
If furnace operation is required during
construction, provisions should be
made to ensure clean outside air for
combustion and ventilation. This
furnace can be severely damaged
due to the abnormal environment
caused by construction. Air laden
with compounds of chlorine and
fluorine, when burned during
combustion, form acids which cause
heat exchanger corrosion.
Some of these compounds are:
paneling, dry wall, floor and tile
adhesives, paints, stains and
varnishes, solvents and masonry
cleaning materials. Sheet rock dust
can destroy motor bearings, clog
filters and damage electrical controls.
Low return air temperature can cause
condensation in the furnace and
damage internal parts which can
shorten the furnace life.
LOCATION
A WARNING:THIS FURNACE IS
NOT APPROVED FOR INST ALLA-
TlON IN A MOBILE HOME. DO NOT
INSTALL THIS FURNACE IN A
MOBILE HOME. INSTALLATION IN
A MOBILE HOME COULD CAUSE
FIRE, PROPERTY DAMAGE AND
PERSONAL INJURY.
The furnace is suitable for installation
in buildings constructed on-site only.
Some installation items to consider are:
A. centrally position it with respect
to the air distribution system;
B. if installed in a utility room, the
door of the room must be wide
enough to allow the largest part
of the furnace to enter, or to
permit the replacement of
another appliance, such as a
water heater.
IMPORTANT:
1. When the furnace is installed in
a residential garage, it must be
installed so the burners and
ignition source are located no
less than 18 inches above the
floor. Also, the furnace must be
located or protected to avoid
physical damage by vehicles.
2. When using evaporator cooling
coils with furnaces installed
above a finished ceiling or living
area, fabricate and install an
auxiliary sheet metal
condensate drain pan under the
entire unit.
3. When using the furnace in
combination with a cooling unit,
install the furnace so that air
cannot flow through the furnace
after it flows through the cooling
coil to avoid condensation on
the heat exchanger. If the
cooling coil is installed parallel
with the furnace, install dampers
or other means to control the air
flow so that chilled air cannot
enter the furnace. If the dampers
are manually operated, they
must be equipped with a means
to prevent the operation of either
unit unless the damper is in the
full heat or full cool position.
4. The furnace must be level to
assure proper operation. If it is
not level, condensate may
accumulate in the secondary
coil, causing furnace shut down.
The furnace is approved for
installation in attics, alcoves, utility
rooms, closets and crawlspaces, if
installed as follows.
1. Units installed over a
finished ceiling
• Install an auxiliary condensate
drain pan under the entire unit.
• The pan should extend under
any evaporator coil used with
the furnace.
2. Provisions to prevent
condensate freezing
• IMPORTANT: If the furnace is
installed in a garage, attic
and/or any unconditioned
space where temperatures can
reach, or drop below, 32°F, a
self-regulating heat tape must
be installed around the
condensate trap and along the
entire length of the condensate
FIGURE 18
HEAT TAPE INSTALLED ON TRAP AND CONDENSATE LINE
TRAP
,.
f
f
22
To Next Page
Loading...