Grain Systems PNEG-269 - Manual (Page 10)

10
Electric Heater
OPERATION
Start Up
1. Turn thermostat knob to its warmest position.
2. Set heater switches to ON position. Red light
should be lit.
3. Watch thermometer on thermostat housing.
When temperaturereaches desired level turn
thermostat knob slowly to the left until heater
lights go out.
Remember: Electric heaters normally give no more
than 5-15 degrees temperature rise.
4. Observe the heater as it runs through a few cycles
to make sure thermostat is set correctly.
Service
All Electric Heater Units are designed and built to with-
stand use in the most severe environments. Take time
out at least once a year to go over the whole unit and
make sure everything is in working order. Preventive
maintenance can save time and money if done on a regu-
lar basis.
1. Always disconnect and lock out the power be-
fore working on or around fan motor and elec-
trical components.
2. Malfunctioning electrical components should be
checked by a qualified electrician.
3. Heater elements should be cleaned yearly to
avoid excess dust and dirt build up. Excessive
build up on heater may cause heater to perform
poorly and reduce the life of the heater elements.
Troubleshooting Chart
Symptom
Heater will not start.
Heater runs for short period of
time and kicks out high limit
switch.
Poor performance
Possible Cause
Blown fuse or breaker in
disconnect switch
Blown fuse in fan control box
Defective wiring or loose
connection
Incorrect wire size
Heater high limit kicked out
Defective thermostat
Thermostat not adjusted
Lack of airflow through heater
Defective high limit switch
Defective element
Low line voltage at the installation.
Power failure.
Dirt build up on element
Defective magnetic contactor
Remedy
Replace fuses or reset breakers.
Replace fuse.
Follow wiring diagram and tighten
any loose connections.
See wire size charts for proper
wire size and change if needed.
Check manual reset. Push in to
reset.
Replace thermostat.
Adjust thermostat settings.
Check for problems with fan or
obstructions that may be blocking
airflow.
Replace high limit switch.
Replace element.
Call power company after making
sure wire size is correct.
Clean element.
Replace contactor.