Grain Systems PNEG-1775 - Manual (Page 20)

6. Operation
20 PNEG-1775 Vane Axial Heater - Canadian
High-Low Heater Operation
1. High-Limit and cycling thermostat must be wired into heater control box for heater to operate.
2. Open all manual shut off valves to heater unit.
3. Start fan. This will supply power to heater.
4. Turn thermostat dial to its highest setting.
5. Turn toggle switch ON. Both lights should illuminate indicating power to the control circuit.
6. Heater will lite after purge. If heater fails to lite check to see that all gas is ON.
7. Open adjustment screw on solenoid valve all the way.
8. Turn thermostat dial back slowly until heater cycles to low flame.
9. Adjust screw on solenoid valve so that low flame pressure is at desired setting. (As low as possible.)
10. Turn thermostat dial to desired setting and wait for bin plenum to come up to temperature. Heater
should cycle to low flame after a few minute.
11. If heater does not cycle to low flame increase high flame gas pressure by adjusting the regulator.
12. High flame should be adjusted so the heater cycles 75% of the time. Low flame should be adjusted
so there is enough flame for unit to keep operating.
13. Watch as burner goes through a few cycles, to be sure that it is operating properly back to
high flame.
Figure 6A