32D1999
11
THTP
TH
Optional Wall Switch or
Remote Reciever
Switch
Milli-volt
Valve
Pilot
ELECTRICAL WIRING (MILLIVOLT)
Figure 8 - Wiring Diagram
The Milli-Volt (thermopile) is a self powered combination gas control that does not require 110VAC to operate. Refer
to
Figure 8
and installation instructions provided with optional wall switch or remote control for wiring instructions. A
maximum length of 15 feet of 18awg two conductor wire is to be used for wall switch. Note switches must be suitable for
millivolt operation.
CHECKING SYSTEM OPERATION
The millivolt system and individual compo-
nents may be checked with a millivolt meter
having a 0-1000MV 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 BE COME 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
as follows:
B. THERMOPILE OUTPUT READING CHECK
(“B” READING - THERMOSTAT CONTACTS OPEN - MAIN BURNER OFF)
a. 325 millivolts minimum. If the minimum millivolt reading is not obtainable, readjust pilot for maximum millivolt
output. If millivolt reading is still below minimum specified, replace thermopile.
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Verify proper operation after
servicing.
W
ARNING
CHECK
TEST
TO TEST
CONNECT
METER LEADS
TO TERMINALS
METER
READING
SHOULD BE
A
COMPLETE
SYSTEM
TH & THTP
CLOSED
B
THERMOPILE
OUTPUT
TH & THTP
OPEN