Operating Options; Millivolt Control System - Lennox Hearth Products RAVELLE 42 Installation And Operation Instructions Manual

Operating Options

Your Ravelle™ 42 gas fireplace comes equipped with an "ON/OFF" rocker
switch used to turn the burner on and off while the pilot light is on . The
switch is a round rocker switch located behind the lower door of the
fireplace's face .
A wall-mounted switch, a millivolt wall thermostat, or a remote control
can be used to supplement the rocker switch . The gas valve is powered
by millivolts generated by the pilot assembly . This millivolt system is
very sensitive to electrical resistance, therefore make sure all connec-
tions are tight, clean and free from corrosion . Do not splice any millivolt
wires . Consult the table on this page to determine the proper gage of
wire for the thermostat or wall switch connections . This table refers to
the total length of the wire (out to the switch and back) . The thermostat
must be a millivolt type . A 24-volt furnace thermostat will not work .
Never hook up household current - 120 Volts - to the millivolt system .
It is not recommended to hook up any more than two switches to the
fireplace (for example a rocker switch and a wall thermostat) . Additional
switches may affect the system resistance and increase the chance of
the burner not igniting .
Follow the instructions included with the thermostat or remote control
for wiring . The thermostat, remote control and rocker switch will turn
the burner on and off independently . Be sure to set the rocker switch to
the "OFF" position when using the thermostat or remote control and set
the thermostat or remote control to the lowest temperature when you
wish to use the rocker switch only, otherwise one may override the other .
Millivolt Control Schematic
Piezo Igniter
Gas Inlet
Figure 47
36
Pilot Hood
Sparker
Thermocouple
Pilot Assembly
Pilot Gas Line
White
Brown
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Thermostat Wire
Wire Size
12 Gage
14 Gage
16 Gage
18 Gage
20 Gage

Millivolt Control System

This fireplace operates on a millivolt control system . As such, no addi-
tional power supply is needed for the fireplace to heat . The pilot assembly
contains a thermocouple, that when heated by the pilot flame, generates
electricity (millivolts- mV=1/1000 of a volt) which opens a valve allow-
ing gas to flow to the pilot assembly . The pilot assembly also contains a
thermopile, that when heated by the pilot flame, generates electricity that
flows to terminal #1 (labeled THTP) on the gas valve . When the electricity
is conducted from terminal #1 through the on/off switch, thermostat,
or receiver of the remote control to terminal #3 (labeled TH) on the gas
valve, the main burner will ignite .
CAUTION: Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and dangerous
operation.
ATTENTION: Au moment de l'entretien des commandes,
étiquetez tous les fils avant de les débrancher. Des erreurs
de cáblage peuvent entraîner un fonctionnement inadéquat et
dangereux.
Thermopile
ON/OFF Rocker Switch, Thermo-
stat, or Remote Thermostat
Maximum Length
100 Feet
64 Feet
40 Feet
25 Feet
16 Feet
Wiring Terminals
TH
TP
TH/TP