Grain Systems PNEG-1775 - Manual (Page 25)

PNEG-1775 Vane Axial Heater - Canadian 25
8. Troubleshooting - Heater
Trouble Probable Cause Check-out Procedure
Burner will not fire. No gas
pressure on gauge.
No ignition spark.
1. Heater not wired.
1. Visually check fan control box to see if wires
are connected.
2. Fan not running. 2. Fan contactor must be energized for heater to run.
3. Blown fuse. 3. Visually check fuse.
4. Bad ON/OFF switch.
4. Check ON/OFF switch contact block for proper
installation and continuity. Check for power on
terminals 1 and 8.
5. Housing high-limit switch. 5. Reset switch. Check for power on terminals 1 and 8.
6. Thermostat open.
6. Plenum temperature above set point temperature or
open circuit.
7. Flame probe open.
7. Remove wires from flame probe and check with
ohm meter. Probe should be closed when cold.
Burner will not fire. No gas
pressure on gauge. Constant
ignition spark.
1. Gas supply.
1. Make sure all valves are open to heater and gas tank is
not empty.
Burner will not fire. Gas pressure
on gauge. No ignition spark.
1. Loose wire.
1. Check for power on terminals 4 and 7. Look for loose wires
or incorrect wiring.
2. Ignitor/spark plug.
2. Turn gas OFF to heater. Check gap on ignitor. Check
porcelain for any sign of cracks. Remove plug wire from
spark plug/ignitor. Carefully holding wire by insulation.
Try to get an arc between end of wire and heater housing
(or other wire using two (2) pole transformer).
3. Ignition transformer/wire.
3. Turn gas OFF to heater. If no spark present after
checking ignitor, remove wire from ignition transformer.
Check for spark at ignition transformer with an insulated
screwdriver. Spark should jump a minimum 1/4" gap.
Replace transformer if no spark is established, replace the
ignition wires.
Burner will not fire or fires for
30 second and locks out. Gas
pressure on gauge. Spark is ON.
1. Plugged orifice.
1. Check for gas at burner. If no gas, remove pipe train and
check orifice and burner ring for blockage.
2. Flame probe.
2. Check to be sure flame probe is in good condition and is
located in flame. Flame probe contacts should open when
probe gets hot.
3. Incorrect supply voltage. 3. Voltage to heater must be 110V AC.
4. Regulator set too low.
4. See that flame burns continuous and is not intermittent.
On ring burners be sure flame burns completely
around ring.
5. Moisture in fuel.
5. Have tank and lines checked by a qualified gas
service man.