Reznor R6GP Option - Installation - LP Conv - Manual (Page 3)

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Figure 1. Typical Burner Box for Light Commercial Units
(R4Gm, R4GN, & R6GP Series)
Gas Valve
Gas Manifold
On/Off
Lever/Switch/Knob
Fastener
s
Burner
Orifices
Flame Sensor
Spark
Ignitor
Burners
Burner
Box
HIGH ALTITUDE DERATION
High altitude application with this unit depends on the installation
altitude and the heating value of the gas. At high altitudes, the
heating value of natural gas is always lower than the heating
value at sea level.
All installations of this equipment must be made in accordance
with the National Fuel Gas Code or with local jurisdiction codes.
For installations at altitudes 2,000 feet or below, the installer does
not need to derate the heat exchanger performance.
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished with
factory supplied orifices. Do not attempt to drill out
orifices in the field. Improperly drilled orifices may
cause fire, explosion, carbon monoxide poisoning,
personal injury or death.
IMPORTANT NOTES:
• For any installation that exceeds 2,000 feet, the input
rate must be reduced 4% per 1,000 feet of altitude
(Example: 12% at 3,000 feet, 16% at 4,000 feet, etc).
Always round up to the next highest value of 1,000. So
an installation at 3,120 feet is derated by 16% due to
rounding up to 4,000.
• Deration is necessary to compensate for low atmospheric
pressure at high altitudes. Generally this will require
obtaining the gas heating value from the local gas utility
and replacing the burner orifices.
EXAMPLE 1:
Elevation: ....................................................3,890 feet
Type of Gas: .......................................... Propane Gas
Unit Model: ................................... R6GP-090C200C
At 4,000 feet, the unit needs to be derated by 4% for each
1,000 feet of elevation. This equates to 16% or less than the
sea level rating of 175,000 Btu/h.
1. Determine unit input rating:
[175k x (100-16)%] = 147,000 Btuh. The required
heating rate for 3,890 feet is 147,000 Btu/h.
2. Determine orifice size:
From Table 1 (page 8), find the Unit Model Number.
Follow across the row and stop at the 2,001 - 4,000
elevation column. For this example, the orifice size
displayed is #52. For units equipped with a White-
Rodgers gas valve, install one #52 orifice in every
burner and check the firing rate. In this example, the
firing rate must not exceed 147,000 Btu/h.
• Table 1 lists the correct orifice size to use at different
altitudes. See Installation Example 1 to determine the
unit rating and orifice size.
• After changing the orifices, it is required that you measure
the gas input rate by clocking the gas meter and using
the local gas heating value. See section on Verifying &
Adjusting the Firing Rate.
IMPORTANT NOTE: Observe the action of the
burners to make sure there is no yellowing, lifting
or flashback of the flame.