Electrical Connections; Room Thermostat; Combustion Chamber - Thermo Products Spirit Series Installation, Operation And Service Manual

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.
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 junction box.
The junction box is mounted inside the furnace burner compartment or mounted on the
front exterior of the furnace, in the case of the horizontal / counterflow model. A ground
connection must also be made in the junction box. The service lines to the furnace
should be no smaller than 14 Ga., insulated copper wire with a temperature rating of
60ºC, or greater.
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 must be connected to the Oil Furnace control. This is typically a low
voltage (24 VAC) circuit. Consult the National Electrical Code, ANSI/NFPA 70-2017, or
latest edition for guidelines for proper wiring methods and materials for this circuit. The
room thermostat should be located on an interior wall in the natural circulating path of the
room air.
The thermostat should not be installed in a location where it is directly exposed to,
 cold air infiltration, i.e. drafts from outside openings such as windows and doors,
 air currents produced by supply air registers, and
 heat from a nearby source, such as a fireplace, electrical appliances, lamps, solar
radiation, a wall enclosing warm air ducts, a chimney, or a flue gas vent.
Most room thermostats are equipped with an adjustable heat anticipator, set the
thermostat heat anticipator to match the control current of the furnace as indicted on the
furnace wiring diagram.

Combustion Chamber

The furnace combustion chamber is a hollow, circular cylinder sealed at the bottom end
and open at the top end. The chamber is made of a lightweight, insulating, "soft",
refractory material. The refractory material is composed of organically bound, alumina-
silica fibers that protect the heat exchanger from the intense heat of the oil burner. A
chamber retainer is used to hold the chamber in place, do not remove or put the furnace
into operation without it.
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