Page 13
G60UH Series
Filters
This unit is not equipped with a filter or rack. A field−pro-
vided high−velocity filter is required for the unit to operate
properly. Table 1 lists recommended filter sizes.
A filter must be in place any time the unit is operating.
TABLE 1
Furnace
Cabinet Size
Filter Size
Side Return Bottom Return
14−1/2" 16 X 25 X 1 (1) 14 X 25 X 1 (1)
17−1/2" 16 X 25 X 1 (1) 16 X 25 X 1 (1)
21" 16 X 25 X 1 (1) 20 X 25 X 1 (1)
24−1/2" 16 X 25 X 1 (2) 24 X 25 X 1 (1)
Duct System
Use industry-approved standards (such as those pub-
lished by Air Conditioning Contractors of America or Ameri-
can Society of Heating, Refrigerating and Air Conditioning
Engineers) to size and install the supply and return air duct
system. This will result in a quiet and low-static system that
has uniform air distribution.
NOTE − Do not operate the furnace with an external static
pressure that exceeds 0.8 inches w.c. Higher external stat-
ic pressures may cause erratic limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a removable
access panel must be installed in the supply air duct. The
access panel should be large enough to permit inspection
(either by smoke or reflected light) of the heat exchanger
for leaks after the furnace is installed. The furnace access
panel must always be in place when the furnace is operat-
ing and it must not allow leaks into the supply air duct sys-
tem.
Return Air Plenum
NOTE − Return air must not be drawn from a room
where this furnace, or any other gas−fueled appliance
(i.e., water heater), or carbon monoxide−producing de-
vice (i.e., wood fireplace) is installed.
When return air is drawn from a room, a negative pres-
sure is created in the room. If a gas appliance is operating
in a room with negative pressure, the flue products can
be pulled back down the vent pipe and into the room. This
reverse flow of the flue gas may result in incomplete com-
bustion and the formation of carbon monoxide gas. This
toxic gas might then be distributed throughout the house
by the furnace duct system.
In upflow applications, the return air can be brought in
through the bottom or either side of the furnace. If a fur-
nace with bottom return air is installed on a platform, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the unit operates properly and
safely. Use fiberglass sealing strips, caulking, or equiva-
lent sealing method between the plenum and the furnace
cabinet to ensure a tight seal. If a filter is installed, size the
return air duct to fit the filter frame.
Venting
A 4−inch diameter flue transition is factory-installed on the
combustion air inducer outlet of all models. Modifying or
removing the flue transition will cause the unit to oper-
ate unsafely and will void the unit certification. The
vent connector does not require insulation.
The combustion air inducer may be rotated clockwise or
counterclockwise by 90° to allow for top or side vent dis-
charge in all applications. When the unit is installed, the flue
transition must be in the 9 o’clock, 12 o’clock or 3 o’clock
position. The unit will not vent properly with the flue
transition pointed down in the 6 o’clock position. Re-
move the four mounting screws, rotate the assembly (in-
cluding the gasket), then reinstall the mounting screws.
To Next Page
Loading...
