GSI Group Chi-Town, Installation & Operation Manual

Page: 22 / 32

22 PNEG-297 Chi-Town Heater
12. TROUBLESHOOTING GUIDE
Trouble Probable Cause Check-out Procedure
1. 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 con-
nected.
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 & 8.
5. Housing High-Limit Switch 5. Reset Switch. Check for power on terminals 1 & 8
6. Thermostat open 6. Plenum temperature above setpoint 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.
2. Burner will not fire. No
gas pressure on gauge.
Constant ignition spark.
1. Electronic time delay 1. Time delay is in lockout or not receiving power.
2. Gas supply 2. Make sure all valves are open to heater and gas tank
is not empty.
3. Burner will not fire. Gas
pressure on gauge. No
ignition spark.
1. Loose wire. 1. Check for power on terminals 2 & 5. 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 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.
4. Burner will not fire or
fires for 30 seconds
and locks out. Gas
pressure on gauge.
Spark is on.
1. Plugged orifice 1. Check for gas at burner. If no gas, remove pipetrain
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 110 AC
4. Regulator set too low. 4. See that flame burns continuous and is not intermit-
tent. On ring burners be sure flame burns completely
around ring.
5. Moisture in fuel. 5. Have tank and lines checked by a qualified gas ser-
vice man.