13
MILLIVOLT SYSTEM, LIGHTING, & BURNING CONTROL
TO TURN OFF GAS APPLIANCE
Turn off all electric power to the appliance if service is to
be performed. Open control access door. Push in gas
control knob slightly and turn clockwise to "OFF". Do not
force. Close control access door.
Pilot Burner Adjustment
l. Remove pilot adjustment cap.
2. Adjust pilot screw to provide proper sized flame
3. Replace pilot adjustment cap.
4. Leak test.
NOTE:
The "On/Off" switch may be replaced with a wall
thermostat which allows the main burner to light and turn
off automatically depending upon the thermostat setting
and room temperature.
LIGHTING INSTRUCTIONS
1. Open access door on front of unit.
2. Push in gas control knob slightly and turn clockwise
to "OFF". NOTE: Knob cannot be turned from
"PILOT" to "OFF" unless knob is pushed in slightly.
Do not force.
3. Wait five (5) minutes to clear out any gas remaining
in burner combustion chamber.
4. Turn knob on gas control counter-clockwise to
"PILOT".
5. Push in control knob all the way and hold in.
Immediately light the pilot with piezo-electric ignitor
while continuing to push knob in for one (1) minute.
Release knob. Pilot should remain lit. If it goes out,
repeat steps 2 through 5 until pilot remains lit. - If
knob does not pop up when released, stop and
immediately call your service technician or gas
supplier. - If pilot will not stay lit after several tries,
turn the gas control knob to "OFF" and call your
service technician or gas supplier.
6. Turn gas control knob counter-clockwise to "ON".
7. All models are supplied with a switch that turns the
main burner on or off. This switch which is located
next to the piezo-electric igniter must be turned to on
in order for the main burner to light. (Be sure switch
is connected to valve.)
8. Adjust the gas flow (flame height) with the HI/LO
gas control knob on valve to the desired level.
SPILL SAFETY SWITCH - Wiring Diagram
820-639 and 820-640 True Millivolt Systems
This System does not have a thermocouple
For serial numbers greater than 4740.
F
M
F
M
CONNECT ONE BLUE LEAD
TO MALE LEAD OF
SPILL SWITCH, AND THE
OTHER BLUE LEAD MALE
TO FEMALE LEAD OF
SPILL SWITCH
TO THERMOCOUPLE
CONNECT TO THERMOCOUPLE AT
VALVE REAR LOCATION
S.I.T. VALVE
TOP VIEW
VENT SAFETY SPILL
SWITCH LOCATED IN
REAR OF UNIT
UNDER DRAFTHOOD
THERMOCOUPLE OPTIONAL
FRONT LOCATION
For SIT 820633-820634 Valves
Use on 820633
and 820634
f i r e - p a r t s . c o m
