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35
Use elbows and 3
″
(76 mm) pipe nipple to connect valve to
piping when using left side gas pipe entry.
*
Union may be installed inside the cabinet when necessary
because of clearances.
Drip Leg and Union, Union* should be outside the cabinet.
Manual shut--off valveMUST beupstream of dripleg, union,
and furnace.
Propane low pressure
switch.
Gas Pipe Grommet
(Single Pipe)
Manual shut-off
valve
Alternative
installation
A09206
Fig. 38 -- Typical Gas Piping for Downflow
Additional Propane Connection Requirements
1. Have a licensed Propane gas dealer make all connections at
storage tank and check all connections from tank to furnace.
2. If copper tubing is used, it MUST comply with limitation
set in National Fuel Gas Code or CGA codes.
3. Two--stage regulation of Propane gas is recommended.
Propane Conversion
An accessory kit shall be used to convert to propane gas use, see the
furnace rating plate for the Propane conversion accessory kit part
number.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
or death.
A Propane conversion accessory kit is required when
operating the fu rnace with Propane gas.
!
WARNING
General Derating Rules
1. These furnaces may be used at full input rating when
installed at altitudes up to 2,000′ (609.6m). When installed
above 2,000′ (609.6m), the input must be decreased 2%
(Natural) or 4% ( Propane) for each 1000′ above sea level in
the USA. In Canada, the input rating must be derated 5%
(Natural Gas) and 10% (Propane Gas) for altitudes 2000′ to
4500′ (609.6 to 1371.6m) above sea level.
2. For operation with natural gas at altitudes above 2,000′
(609.6m), orifice change and/or manifold pressure
adjustments may be required for the gas supplied. First
consult your local gas supplier, then refer to or Table 7 for
required pressure change and/or orifice change for high
altitudes.
* Based on mid ---range of elevation.
3. For operation with Propane gas, gas orifices MUST be
changed and manifold pressure MUST be maintained as
per Table 8. Orifices can be ordered through your
distributor. See Fig. 39.
4. In cases where Table 7 is not applicable, eg. alternate input
rate application, refer to above table for required high
altitude input rate.
High Altitude Input Rate =
Nameplate Sea Level Input Rate x (Multiplier)*{
Elevation
ft (m)
High Altitude Multiplier
Natural Gas Propane Gas
2001′ - 3000′
(609.9 -- 914.4)
{
0.95 0.90
3001′ - 4000′
(914.7 -- 1219.2)
0.93 0.86
4001′ - 5000′
(1219.5 -- 1524)
0.91 0.82
5001′ - 6000′
(1524.3 -- 1828.8)
0.89 0.78
6001′ - 7000′
(1829.1 -- 2133.6)
0.87 0.74
7001′ - 8000′
(2133.9 -- 2438.4)
0.85 0.70
High Altitude Air Pressure Switch
Altitudes over 4,000′ (1219.2m) may require a different air pressure
switch than the one installed at the factory. Check parts list for
pressure switch and consult your distributor for part number and
availability. In Canada, provincial codes may govern installation of
switch. Check with governing authorities.
* In the USA, derating of these furnaces at 2% (Natural Gas) and
4% (Propane Gas) has been tested and design--certified by CSA.
{In Canada, the input rating must be derated 5% (Natural Gas)
and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to
1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4
m) column in Table 7 and Table 8.
58HDV