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ELECTRICAL WIRING (MILLIVOLT)
The millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE
110V AC TO OPERATE.
Label all wires prior to
d i s c o n n e c t i o n w h e n
servicing controls. Wiring
errors can cause improper
and dangerous operation.
Verify proper operation
after servicing.
CONNECTION
Figure 12 -
Wiring Diagram
CONNECT OPTIONAL WALL SWITCH
1. Use 18 awg, two-wire cable, 15 feet maximum length.
2. At one end of the cable, connect both wires to the wall
switch. At the other end, connect one wire to TP/TH and
one wire to TH, or connect the wall switch to the two
male (0.25") terminals on the left side of the unit. The
color of the wires does not matter.
CHECk SYSTEM OPERATION
The millivolt system and individual components may be
checked with a millivolt meter having a 0-1000 mV range.
Conduct each check shown in chart below by connection
meter test leads to terminals as indicated.
58D6002
Wall
Switch
1 = TP
2 = TP, TH
Optional Wall
Switch or
3 = TH
Remote
Check
To
Test
Test
A
Complete
System
B
Thermopile
On/Off
Switch
3
1
2
A. COMPLETE MILLIVOLT SYSTEM CHECk
("A" Reading - Thermostat contacts CLOSED -
Control knob "ON" - Main burner should turn ON)
a. If the reading is more than 100 millivolts and the
ST1176
automatic valve still does not come on, replace the
Millivolt valve wiring
control.
b. If the closed circuit reading ("A" reading) is less than
100 millivolts, determine cause for low reading, pro-
ceed to Section B below.
B. Thermopile Output Reading Check
("B" Reading - Thermostat contacts OPEN - Main
burner OFF)
1. Check gas pressure to the unit. If gas pressure is
within minimum and maximum on data plate, then
check pilot voltage, 325 millivolts minimum. If the
minimum millivolt reading is not obtainable, replace
pilot.
Connect Meter
Switch or
Leads to
Thermostat
Terminals
Contacts
2 & 3
1 & 2
Unvented Cast Iron Gas Stoves
On/Off
Switch
ODS Pilot
Millivolt Valve
Spade Terminal
Switch
Meter
Reading
Should Be
Closed
Closed
Open
Open
ODS Pilot
13
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