Allied Air 80G1UH2V, Installation Instructions Manual

506471-01

Page 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 Revolution

BTU/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.