32D1999
11
THTP
TP
TH
Optional Wall Switch or
Remote Receiver
Switch
Millivolt
Valve
Pilot
ELECTRICAL WIRING (MILLIVOLT)
Figure 8 - wiring Diagram
The Millivolt (thermopile) is a self powered combination gas control that does not require 110VAC to operate. See
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 com-
ponents may be checked with a millivolt
meter having a 0-1000MV range. Conduct
each check shown in chart below by con-
nection meter test leads to terminals as
indicated.
A. COMPLETE MILLIVOLT SYSTEM CHECk
("A" READING - 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 con-
trol.
b. If the closed circuit reading (“A” reading) is less than 100 millivolts, determine cause for low reading - pro-
ceed as follows:
B. THERMOPILE OUTPUT READING CHECk
(“B” READING - CONTACTS OPEN - MAIN BURNER OFF)
a. 325 millivolts minimum. If the minimum millivolt reading is not obtainable, readjust pilot for maximum mil-
livolt output. If millivolt reading is still below minimum specified, replace thermopile.
CHECk
TEST
TO TEST
CONNECT
METER LEADS
TO TERMINALS
METER
READING
SHOULD BE
A
COMPLETE
SYSTEM
TH & THTP
MINIMUM
100mV
B
THERMOPILE
OUTPUT
TP & THTP
MINIMUM
325mV
W
ARNING
Label all wires prior to disconnection
when servicing controls. Wiring
errors can cause improper and
dangerous operation. Verify proper
operation after servicing.
