Monessen Hearth VWF18 Installation And Operating Instructions Manual page 9

operation. Verify proper operation after
The Milli-Volt (thermopile) is a self powered combination gas control
that does not require 110VAC to operate. Refer to Figure 8 and installa-
tion 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. The optional wall switch and remote
CHECKING SYSTEM OPERATION
The milli-volt system and individual components 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 MILLI-VOLT SYSTEM CHECK
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
a. 325 millivolts minimum. If the minimum millivolt reading is not obtainable, readjust pilot for maximum millivolt
27D8520
THTP
TP
TH
Figure 8 - Wiring Diagram
CHECK
TEST
Do not connect to 110 volt supply.
source and hot surfaces.
CONNECT
METER
TO LEADS TO
TEST TERMINALS
METER
READING
SHOULD BE