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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 .
CAUTION: LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS
OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
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.
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.
Check
Test
To Test
Connect
Meter Leads
to Terminals
Switch or
Thermostat
Contacts
Meter Reading
Should Be
A
Complete System
2 & 3
Closed
Closed
B
Thermopile
1 & 2
Open
Open
On/Off
Switch
Wall
Switch
Optional Wall
Switch or
Remote
ODS Pilot
Millivolt Valve
CONNECTION
1 = TP,
TH
2 = TP
3 = TH
Wiring Diagram
Switch
Spade Terminal
On/Off
Switch
ODS Pilot
3
1
2
