Crown Boiler CLBR68-112 - Manual (Page 14)

14
Electrical Connections
NOTICE: All field wiring must conform to local, state, and national installation
codes.
A disconnecting switch equipped with overcurrent protection rated at 15 A. (e.g. a time
delay-type fuse or inverse time, circuit breaker) should be installed in the service line for
shutting down and protecting the furnace and electrical system.
Since the furnace is entirely pre-wired at the factory, it is only necessary to connect the
building electrical service lines to the two (2) pigtail wires extending from the fan center
junction box. The fan center is mounted inside the furnace burner compartment or
mounted on the front exterior of the furnace, in the case of the horizontal / counterflow
model. The service lines to the furnace should be no smaller than 14 Ga., insulated
copper wire with a temperature rating of 60ºC, or greater.
Connect an equipment ground wire to the furnace at the fan center junction box. If
wiring is run through metal electrical conduit, it may not be necessary to run a separate
equipment ground wire. Consult local codes and authorities for specific minimum
requirements.
A two (2) wire connection to the room thermostat from the oil primary control is also
necessary. This is typically a low voltage (24 VAC) circuit. Consult the National
Electrical Code, ANSI/NFPA 70-2002, for guidelines for proper wiring methods and
materials for this circuit.
Refer to the electrical diagrams contained in Appendix B of this manual for an electrical
schematic, a connection diagram, and operating instructions.
Room Thermostat
A room thermostat is not furnished with this furnace. However, a thermostat is required
to properly operate the furnace control system in a typical residential heating
application.