J952V Installation Manual

20
specifies the heating value at the residence’s gas meter
as the “local value”.
For added flexibility, two tables have been provided for
natural gas installations with high or low heating values at
sea level.
Table 9 (page 30) & Table 10 (page 30) contain
the orifice sizes and manifold pressure to use at various
altitudes.
Table 9 (HIGH) is for natural gas installations with
a heating value of more than 1,000 Btu per cubic foot and
Table 10 (LOW) is for less than 1,000 Btu per cubic foot. To
determine which table to use:
1. Consult your local utility for the local heating value at your
installation.
2. From
Table 8 (page 29), find your local heating value as
supplied by the utility company. Follow down the column
and stop at your altitude level.
3. If your sea level heating value is HIGH, use
Table 9 or if
it’s LOW, use
Table 10. See example.
EXAMPLE
Elevation: ......................................................5,000 feet
Type of Gas: .............................................. Natural Gas
Local Heating Value of Gas: .................................. 750
From
Table 8, find 750 and follow down the column, stop
at the 5,000 feet row. The heating value listed is LOW.
Table 10 will be used to determine orifice size and manifold
pressure.
After changing the regulator pressure or changing the orifices,
it is required that you measure the gas input rate. This may
be accomplished in the usual way, by clocking the gas
meter and using the local gas heating value. See Verifying
& Adjusting the Input Rate section (
page 24).
IMPORTANT NOTE
Observe the action of the burners to make sure there is
no yellowing, lifting or flashback of the flame.
For US installations only: To avoid nuisance tripping
at altitudes from 7,500 to 10,000 feet, a pressure switch
conversion may be required. Consult the tables in the LP
and High altitude and LP gas conversion kit for installations
in the US.
Converting from Natural Gas to LP / Propane
WARNING:
The furnace was shipped from the factory
equipped to operate on natural gas. Conversion
to LP / Propane gas must be performed by
qualified service personnel using a factory
supplied conversion kit. Failure to use the proper
conversion kit can cause fire, explosion, property
damage, carbon monoxide poisoning, personal
injury, or death.
Conversion to LP / Propane is detailed in the installation
instructions provided with the conversion kit. Generally,
this will require the replacement of the burner orifices and
the spring assembly in the pressure regulator. Approved
conversion kits are listed below:
• Installations in the United States: For Propane (LP)
conversion or for LP gas installations in altitudes between
2,000 ft. and 10,000 ft. above sea level, use the LP &
High Altitude LP Gas Conversion Kit (P/N 905028) for
Installations in the United States. Please follow the
instructions provided with the kit.
• Installations in Canada: For Propane (LP) conversion or for
LP Gas installations in altitudes between zero and 4,500
ft. above sea level, use the LP & High Altitude LP Gas
Conversion Kit (P/N 905029) for Installations in Canada.
Please follow the instructions provided with the kit.
If the installation is in the U.S. above 2,000 ft., refer to
Table 7
(page 29)
to determine the correct orifice size and regulator
pressure. See
Example below.
EXAMPLE
Elevation: ......................................................5,000 feet
Type of Gas: ............................................ Propane Gas
Input BTUH of Furnace: ....................................80,000
From
Table 7, find 5,000 and follow across the row; stop
at the 80,000 btuh column. At first stage, the manifold
pressure listed is 4.2, but at 2nd stage the pressure is 9.0.
The listed orifice size is 56.
When conversion is complete, verify the manifold pressure
and input rate are correct as listed in the Tables.