Grain Systems PNEG-012 - Manual (Page 17)

4. Installation
PNEG-012 Vane Axial Heater 17
Heater Orifice Setup
The factory has set the orifices size for propane, high temperature and natural gas, low temperature.
1. Determine the type of gas to be used: Propane or natural gas.
2. Determine the operating temperature ranges to be used: High or low. Refer to tables on Page 23
and Page 24 .
3. For natural gas high temperature applications remove reducer bushing with pressure gauge and
remove 7/32" primary orifice from system. Replace reducer bushing and check connections for leaks.
For natural gas high temperature configuration there is no primary orifice in the system. Refer to
Fuel - Temperature Table below .
4. For propane low temperature applications remove reducer bushing with pressure gauge and replace
the supplied 7/32" primary orifice with a 3/32" orifice supplied in control box. Replace reducer
bushing and check connections for leaks. Refer to
Fuel - Temperature Table below .
Figure 4I
Fuel - Temperature
Fuel
Temperature
High Low
Natural Gas Remove primary orifice completely.
No modifications required.
Standard with 7/32" orifice.
Propane
No modifications required.
Standard with 7/32" orifice. Replace primary orifice with 3/32"
orifice supplied in control box.
CAUTION
Make sure the configuration matches the appropriate application in the
Fuel - Temperature Table above. Propane has a higher BTU content than natural
gas. Do not remove 3/8" secondary orifice. Excessive heat rise due to improper
orifice sizing or removing the 3/8" secondary orifice will damage grain or
cause fire.