SCAN 70 gas insert / ZC-fireplace, Instructions For Installation And Use Manual

Page: 54 / 64

54
8.4. How this insert / ZC-fireplace works
This insert / ZC-fireplace was designed with safety as the primary concern. Many of the components inside this insert
/ ZC-fireplace are for safety purposes. Therefore, only certified gas service technicians should service this insert / ZC-
fireplace.
What turns the main burner on and off:
This insert / ZC-fireplace uses a millivolt system to control its operation (a millivolt is a very small amount of electric-
ity). The thermopile and thermocouple generate electricity when heated by the pilot flame. This electricity is used to
operate the gas valve. Without enough electricity, the gas valve will not turn on. That is why when starting the pilot
the gas control knob has to be pressed in long enough for the thermocouple to heat up and generate enough electricity.
The thermopile provides power for the ON/OFF switch, remote control, or thermostat (See the illustration below).
Because the thermopile generates the electricity needed to turn the insert / ZC-fireplace on and off, this insert / ZC-
fireplace can be operated when the power is out (although the blower will not run).
What prevents gas build-up:
This insert / ZC-fireplace utilizes a high technology gas valve in conjunction with a pilot flame to ensure no gas builds
up inside the firebox.
The thermocouple (next to the pilot) senses when the flame is lit. If the pilot goes out, this thermocouple no longer
generates electricity causing the gas valve to automatically shut off all gas to the insert / ZC-fireplace, preventing the
pilot from spilling gas into the firebox.
This electricity is
used to operate
the main burners.
When heated, the thermopile generates
electricity (a very small amount measured
in “millivolts”).
The main
burners are
switched on
and off using
the electricity
generated by the thermopile.
The ON/OFF switch or remote
control, control
the circuit to
the main
burner.
Pilot flame
The pilot flame is a time-proven
component that eliminates the possibility
of gas buildup inside the firebox.
Thermocouple
The thermocouple generates a
small amount of electricity. If
the pilot flame goes out, the
gas valve automatically shuts
off all gas.
Gas valve
This high-technology valve
automatically shuts off all gas if it
does not receive a signal from the
thermocouple. If any component is
damaged or sensing a malfunction,
or if the wiring is damaged, it will shut
off all gas.
External shut off valve
This valve is placed on the
gas line to shut off gas to the
insert during maintenance
procedures.
Ceramic glass
The glass in your insert is the
most durable glass available. It
has been tested to be extremely
resistant to breakage from
temperature changes.