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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.
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 automatic valve still does not come on,
replace the control.
b. If the closed circuit reading ("A" reading) is less than 100 millivolts, determine cause for
low reading, proceed 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.
58D6002
Wall
Switch
1 = TP
2 = TP, TH
Optional Wall
Switch or
3 = TH
Remote
Check
Test
On/Off
Switch
3
1
2
ST1176
Millivolt valve wiring
Connect Meter
To
Test
A
Complete
System
B
Thermopile
Unvented Cast Iron Gas Stoves
On/Off
Switch
ODS Pilot
Millivolt Valve
Spade Terminal
Switch
Switch or
Leads to
Thermostat
Terminals
Contacts
2 & 3
Closed
1 & 2
Open
ODS Pilot
Meter
Reading
Should Be
Closed
Open
13
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