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ELECTRICAL WIRING
Label all wires prior to disconnection when
servicing controls.
Wiring errors can cause improper and
dangerous operation.
Verify proper operation after servicing.
Pilot
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 option-
al 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 components may be
checked with a millivolt meter having a 1-1000 mV range.
Conduct each check shown in chart by connecting meter
test leads to terminals as indicated.
Check
Test
To Test
A
Complete
System
B
Thermopile
Output
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
TP
TH
FP2857
millivolt wiring
Connect
Meter
Meter Leads
Reading
To Terminals
Should Be
TH & THTP
Minimum
100mV
TP & THTP
Minimum
325mV
THTP
Optional Wall Switch
or Remote Receiver
A. Complete Millivolt System Check
("A" Reading - Contacts CLOSED - Control knob "ON"
- Main burner should turn ON)
1. If reading is more than 100 millivolts and the au-
tomatic valve still does not come on, replace the
control.
2. If the closed circuit reading ("A" reading) is less
than 100 millivolts, determine cause for low read-
ing, proceed to Section B.
B. Thermopile Output Reading Check
("B" Reading - Contacts OPEN - Main burner OFF
1. 325 millivolts minimum. If the minimum millivolt
reading is not obtainable, readjust pilot for maxi-
mum millivolt output. If millivolt reading is still below
minimum specified, replace thermopile.
Millivolt
Valve
Switch
FP2857
9
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