G6RA, G6RK Service Manual 37
Figure 53. Typical Gas Service Connection
G6RA&K Typical Left Side Entry
CAUTION:
!
Do not re-drill the burner orifices. If the orifice
size must be changed, use only new orifices.
GAS CONVERSION AND HIGH ALTITUDE DERATE
High Altitude Derate
The nameplate input rating for the furnaces apply for elevations
up to 2,000 feet (610m) above sea level. For elevations over
2,000 feet, reduce the input by 4% for each 1,000 feet above
sea level. For example, a furnace applied at an elevation of
5,000 feet should be derated by 20%. See Table 10 describing
the correct orifice for derate.
NOTE: The density of air decreases with increasing elevation
above sea level. This reduces the quantity of combustion air
drawn into the furnace under normal operation and requires
the unit to be derated by using smaller gas orifices or lower
manifold pressure.
Conversion
Conversion of this furnace to utilize LP/propane gas
must be made by qualified service personnel, using only
factory authorized or approved parts.
Verifying and Adjusting Firing Rate
The firing rate must be verified for each installation to prevent
over-firing of the furnace.
IMPORTANT NOTE:
The firing rate must not exceed the rate shown on
the furnace rating plate. At altitudes above
2,000 feet it must not exceed that on the rating
plate less 4% for each 1,000 feet.
G6RA&K- Right Side Entry
Burner
Assembly
Manifold
Automatic Gas
Valve (with manual
shut-off)
Ground Joint
Union
Dripleg
Shut-Off Valve
with
1
8 NPT
plugged tap
Burner
Assembly
Manifold
Some utilities
require Shut-Off
Valve to be
4 to 5 feet
above floor
Automatic Gas
Valve (with manual
shut-off)
EXAMPLE 1
Elevation 3,890 feet
Type of gas Natural
Furnace model G6RA096( )16
Orifice as shipped #42 Drill
What burner orifices are needed?
The required input for 3890 feet is 81,000 Btu/h or 16% less
than the sea level rating of 96,000 Btu/h.
See Table 10 for natural gas, find the Furnace Model Number
and follow across the table for the elevation 2000-4000
column. From the table, choose a #43 orifice. Install a #43
orifice in every burner and check firing rate per VERIFYING
AND ADJUSTING FIRING RATE section. The firing rate in
this example must not exceed 81,000 Btu/h.
EXAMPLE 2
Elevation 5,500 feet
Type of gas Propane
Furnace model G6RA096( )-16
Orifice in Natural to LP
Conversion Kit # 55 drill
What burner orifices are needed?
The required input for 5500 feet is 73,000 Btu/h or 24% less
than the sea level rating of 96,000 Btu/h.
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