Reznor R6GP Unit Installation Manual - Manual (Page 12)

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• If installing this unit above 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. NOTE: This 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.
• Table 15 (page 40) lists the correct orifice size to use
at different altitudes. To determine the unit rating and
orifice size, see the installation example.
• 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
and Adjusting the Firing Rate on page 16.
IMPORTANT NOTE: Observe the action of the
burners to make sure there is no yellowing, lifting
or flashback of the flame.
Conversion 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.
INSTALLATION EXAMPLE:
Elevation: ..................................................3,890 feet
Type of Gas: .................................................. Natural
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 200,000 Btu/h.
1. Determine unit input rating:
[200k x (100-16)%] = 168,000 Btuh. The required
heating rate for 3,890 feet is 168,000 Btu/h.
2. Determine orifice size:
From Table 15 (page 40), find the Unit Model Number.
Follow across the row and stop at the 2,000-4,000
elevation column. For this example, the orifice size
displayed is #38. Install one #38 orifice in every burner
and check firing rate. In this example, the firing rate
must not exceed 168,000 Btu/h.
Figure 9. Typical Gas Service Connection
1. All piping must comply with local codes, ordinances, and/or National Fuel Gas Codes.
2. A manual shutoff valve must be installed within 6 feet of this equipment.
3. Always include a drip leg in piping.
NOTES:
Gas Valve
Gas Valve
Riser
3 in.
Minimum
Horizontal
Drop
Piped Gas Supply Tubing Gas Supply
3 in.
Minimum
Horizontal
Drop
Gas Valve
3 in.
Min.
Riser
Piped Gas Supply
In the U.S., if installing the unit above 2,000 ft., refer
to Table 15 to determine the correct orifice size. When
conversion is complete, verify the input rate is correct as
listed in the tables. Approved conversion kit must be used.
Please follow the instructions provided with each kit
.