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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 insert (for example a rocker
switch and a wall thermostat). Additional switches may af-
fect 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. If a re-
mote thermostat is to be used with the insert, do not place
the receiver under the firebox.
Thermostat Wire
Wire Size
1 Gage
14 Gage
16 Gage
18 Gage
0 Gage
Millivolt Control Schematic
Valve Terminals
3
Terminal
GAS
INLET
Figure 1
Maximum Length
100 Feet
64 Feet
40 Feet
5 Feet
16 Feet
PIEZO IGNITER
Fig. 15
MANIFOLD PRESSURE TAP
INLET PRESSURE TAP
VENT SAFETY
SNAP SWITCH
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
m
C
s
illivolt
ontrol
ystem
This insert operates on a millivolt control system. As such, no
addition power supply is needed for the insert to operate. The
pilot assembly contains a Thermopile, that when heated by the
pilot flame, generates electricity (millivolts, mV=1/1000 of a volt)
that travels to terminal #1. From this terminal it travels through
a black wire to the Vent Safety Snap Switch. If this switch over-
heats through a flue blockage or vent pipe disconnection it will
open, stop the flow of mV and shut the insert off. This switch will
automatically reset (close), when it is cooled down to normal
operating temperature. During normal operation, it is closed
allowing the mV to flow back to the valve, which opens so gas
can flow through.
Millivolt and System Checks
Check
To
Test
Test
Terminals
A
Complete
System
B
Thermopile
Output
C
System
Resistance
PILOT
SPARKER
PILOT TUBE
3
2
1
Connect
Thermostat
Meter
Meter
Connects
Reading
Leads to
Should Be
&
Closed
100 MV
or More
1 &
Open
Greater
Than
5 MV
&
Closed
.5 Ohms
THERMOPILE
ON/OFF ROCKER SWITCH,
THERMOSTAT, or REMOTE
THERMOSTAT
17
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