Electrical Wiring - Millivolt; Check System Operation - MHSC Duzy VDY24 Installation And Operating Instructions Manual

ELECTRICAL WIRING - MILLIVOLT

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 optional
wall switch or remote control for wiring instructions. A max-
imum 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
32D1999
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.
"Duzy" Series Vented Gas Log Sets
Millivolt
Valve
Switch
FP2857
9