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506471-01Page 34 of 41 Issue 1034
The heating value of the gas can be obtained from the local
utility company.
For Propane Gas: The only check for the furnace rate is to
properly adjust the manifold pressure using a manometer
and the information provided in Table 12. Typical manifold
set point for installations at altitudes from 0 to 4500 feet
above sea level is 10.0" W.C.
Temperature Rise
Check the temperature rise and, if necessary, adjust blower
speed to maintain temperature rise within the range shown
on the unit rating plate.
High Altitude
In both the United States and Canada, this furnace is
approved for operation at altitudes from 0 to 4500 feet above
sea level without any required modifications. From 4500 to
7500 feet, the gas manifold pressure needs to be adjusted
For Natural Gas: Check the furnace rate by observing the
gas meter, when available, making sure all other gas
appliances are turned off. The test hand on the meter should
be timed for at least one revolution. Note the number of
seconds for one revolution.
according to the information shown in Table 12. To adjust
the manifold pressure, refer to previous section Checking
and Adjusting Gas Input. For installations above 7500
feet, call Technical Service at 1-800-515-3501 for assistance.
For installations above 4500 feet fill in the appropiate
information on the furnace label that has the words “This
furnace was converted on . . . . . . “.
Emergency Replacement Motor Operation
If the variable speed motor needs to be replaced in an
emergency situation (such as “no heat”) and an exact
replacement motor is not immediately available, a standard
PSC motor of equivalent frame size, voltage, rotation, and
horsepower can be temporarily installed until the correct
replacement motor can be obtained.
Connect the desired speed tap to the “EAC” terminal and the
neutral tap to the neutral terminal on the ignition control (refer
to the furnace wiring diagram). T he ignition control will control
the motor’s operation, including a nominal 20 second “on” delay
with a call for heat and a nominal 180 second “off” delay when
the thermostat is satisfied. It will also operate the motor on a
call for cooling, with no “on” or “off” delays.
Verify that the unit is operating at the desired speed and
within the rise range as shown on the unit rating plate.
The correct replacement motor must be installed as
soon as possible to ensure continued satisfactory
operation of the furnace.
x
3600
x
=
Cubic Feet Per RevolutionBTU/HR
INPUT # Seconds Per Revolution
Heating
Value
MANIFOLD PRESSURE SETTINGS
Table 12
* Consult local utility for actual heating value.
Furnace input = Input Factor x Nameplate Input
NOTE: A natural to LP/Propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the
conversion procedure.