27D8851
12
VWFST Series Vented Gas Log Set
WIRING -MILLIVOLT
The Millivolt (thermopile) is a self powered combination gas
control that does not require 110VAC to operate. Refer to
Figure 14
and installation instructions provided with optional
wall switch or remote control for wiring instructions. A maxi-
mum length of 15 feet of 18 awg two conductor wire is to
be used for wall switch. Note switches must be suitable
for Millivolt operation. The optional wall switch and remote
receiver must be mounted outside the firebox.
CHECK SYSTEM OPERATION
The Millivolt 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 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 control.
b. If the closed circuit reading (“A” reading) is less
than 100 Millivolts, determine cause for low reading
— proceed as follows:
W
ARNING
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing
W
ARNING
Do not connect to 110 Volt supply
FP2738
wiring diagram
Pilot
THTP
TP
TH
Millivolt
Valve
FP2738
Figure 14 -
Wiring Diagram
Optional Wall
Switch or Remote
Receiver
W
ARNING
Keep wiring away from heat source and
hot surfaces.
Connect
Meter
Meter
Check
To Test
Leads to
Reading
Test
Terminals
Should Be
A
Complete
TH & TH/TP
Min. 100 mV
System
B
Thermopile
TP & THTP
Min. 325 mV
Output
B. THERMOPILE OUTPUT READING CHECK
(“B” READING - CONTACTS OPEN - MAIN
BURNER OFF)
a. 325 Millivolts minimum. If the minimum Millivolt read-
ing is not obtainable, readjust pilot for maximum Mil-
livolt output. If Millivolt reading is still below minimum
specified, replace thermopile.
