Grain Systems PNEG-1776 - Manual (Page 21)

6. Operation
PNEG-1776 Deluxe Downwind Heater - Canadian 21
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 indicator lights should illuminate indicating power to the control circuit.
6. Heater should now be lit. If not check to see that all gas is ON.
7. Loosen the retaining nut holding bypass valve screw in place. Open the bypass valve all the way.
8. Turn thermostat dial back slowly until heater cycles to low flame.
9. Adjust bypass 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 minutes.
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 at least once a minute. 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