SYSTEM OPERATION
10
Leveling
Leveling ensures proper condensate drainage from the heat
exchanger. For proper flue pipe drainage, the furnace must
be level lengthwise from end to end. The furnace should have
a slight tilt from back to front with the access doors downhill
from the back panel approximately 1/2 to 3/4 inches. The
slight tilt allows the heat exchanger condensate, generated in the
recuperator coil, to flow forward to the recuperator coil front cover.
Alternate Vent/Flue and Combustion Air Connec
-
tions
In horizontal installations provisions for alternate flue and
combustion air piping are available for upflow furnaces with left
discharge and counterflow furnaces with right air discharge.
This configuration allows the flue and combustion air piping to
be run vertically through the side of the furnace. Refer to the
“Recommended Installation Positions” figure for further detail.
The standard piping connections may also be used in these
positions. Refer to
Vent/Flue Pipe and Combustion Air Pipe
for details concerning the conversion to the alternate vent/
flue and combustion air connections.
When using the horizontal alternate vent configuration,
you must use the RF000142 vent drain kit. See following
illustration.
AIR
DISCHARGE
Bottom
Return
Duct
Connection
Side
Return
Duct
Connection
Side
Return
Duct
Connection
UPFLOW
UPRIGHT
Alternate Vent/Flue Location
Figure 3A
AIR
DISCHARGE
Bottom
Return
Duct
Connection
UPFLOW HORIZONTAL
LEFT AIR DISCHARGE
Figure 3B
AIR
DISCHARGE
Bottom
Return
Duct
Connection
UPFLOW HORIZONTAL
RIGHT AIR DISCHARGE
Figure 3C
Alternate Electrical and Gas Line Connections
This furnace has provisions allowing for electrical and gas line
connections through either side panel. In horizontal applications
the connections can be made either through the “top” or “bottom”
of the furnace.
Drain Pan
A drain pan must be provided if the furnace is installed above a
conditioned area. The drain pan must cover the entire area under
the furnace (and air conditioning coil if applicable).
Freeze Protection
Refer to
Horizontal Applications and Conditions - Drain Trap
and Lines.
WARNING
P
OSSIBLE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
MAY
OCCUR
IF
THE
CORRECT
CONVERSION
KITS
ARE
NOT
INSTALLED
. T
HE
APPROPRIATE
KITS
MUST
BE
APPLIED
TO
ENSURE
SAFE
AND
PROPER
FURNACE
OPERATION
. A
LL
CONVERSIONS
MUST
BE
PERFORMED
BY
A
QUALIFIED
INSTALLER
OR
SERVICE
AGENCY
.
High
Stage
Low
Stage
Natural
None
#45
3.5" w.c.
1.9" w.c.
None
Propane
LPM-08*
1
1.25mm
10.0" w.c. 6.0" w.c.
None
Manifold Pressure
Pressure
Switch
Change
0-7000
1
LPM-08* supports both Honeywell and White-Rodgers 2-stage valves
NOTE:
In Canada, gas furnaces are only certified to 4500 feet.
Gas
Altitude
Kit
Orifice
Propane Gas/High Altitude Installations
This furnace is shipped from the factory configured for natural gas
at standard altitude. Propane gas installations require an orifice
change to compensate for the energy content difference between
natural and propane gas.
