Grain Systems PNEG-1702 - Manual (Page 49)

7. Vision Test Firing
PNEG-1702 ETL Listed GSI/FFI Portable Dryer Manual 49
Approximate setting should be:
If the burner remains on high-fire and does not cycle, increase the regulator setting, in order to reach the
plenum setpoint. If the burner remains in low-fire and does not cycle, slightly decrease gas pressure with
the low-fire adjustment screw on the cycle solenoid. If the gas pressure is decreased too much, a popping
or fluttering sound will be heard. This popping and fluttering should not be allowed to continue, or damage
to the burner will occur. Be sure to adjust the low pressure needle valve anytime the high pressure
regulator is adjusted. Repeat the test for each fan/heater unit.
Figure 7A Liquid Propane (LP) Pipe Train
LP Gas Natural Gas
High-Fire 6-15 PSI (41-102 kPa) High-Fire 6-10 PSI (41-69 kPa)
Low-Fire 2-6 PSI (14-41 kPa) Low-Fire 1-3 PSI (7-20 kPa)
Low-fire
needle valve
Pressure regulator
(high-fire)
Watch gauge
for pressure
Relief valve