CSA RA 350 - Size 500 Illustration

Form I-RA/D 350/500, Page 40
Location of Components Referenced in Troubleshooting Charts
Size 500
Manually reset Backow
Sensor Switch on the
Viewport Door
Transformer (Open
the transformer
to service the cad
cell.)
5 amp fuse
mounted on the
top of the electric
box. See wiring
diagram.
Ignition
Controller
Green Light: Limits
are satised; heater
is ready to operate.
*Air pressure switch is inside the main
electrical box.
220V eld connections are inside the main
electrical box.
Green Indicator Light (”power on”)
Manual Disconnect Switch
Oil Inlet
Connection
115V Terminal
Connections 11-19
are in the burner
junction box.
Piston-type Air
Compressor
Box contains oil heat exchanger (pre-heater) with 770 watt
cartridge heating element and temperature controls.
Burner Motor
Reset Button
*Main
Electrical
Box
Burner Tee
with Strainer
IMPORTANT NOTE: Effective 1/20/2005, Models RA/RAD
500 were converted to a 240 volt 3-wire system. The car-
tridge heaters, air compressor, burner, and hour meter were
changed from 240 volt to 120 volt.
Where applicable, troubleshooting charts have alternate
instructions for a Size 500 manufactured prior to 1/2005.
Before troubleshooting, check the wiring diagram on the
heater against the Size 500 diagrams on pages 50-57 to
verify which instructions apply to the unit being serviced.