Electrical Wiring; Connect Optional Wall Switch; Check System Operation; Complete Millivolt System Check - Monessen Hearth VFCS30DNV Installation & Operating Manual

Electrical Wiring (Millivolt)
The millivolt valve is a self-powered combination gas control
THAT DOES NOT REQUIRE 110V AC TO OPERATE.
!
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.

Connect Optional Wall Switch

1. Use 18 awg, two-wire cable, 15 feet maximum length.
2. At one end of the cable, connect both wires to the wall
switch. At the other end, connect one wire to TP/TH and
one wire to TH, or connect the wall switch to the two male
(0.25") terminals on the left side of the unit. The color of
the wires does not matter.

Check System Operation

The millivolt system and individual components may be
checked with a millivolt meter having a 0-1000 mV range.
Conduct each check shown in chart below by connection
meter test leads to terminals as indicated.
Wall Switch
Optional Wall
Switch or Remote
Figure 12 - Wiring Diagram
3-90-58D6002
CAUTION
On/Off Switch
Monessen • Concorde VF Installation Manual_R11 • 02/17
A. Complete MilliVolt System Check
("A" Reading - Thermostat contacts CLOSED -
Control Knob "ON" - Main burner should turn 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 to Section B below.
B. Thermopile Output Reading Check
("B" Reading - Thermostat contacts OPEN - Main
burner OFF)
1. Check gas pressure to the unit. If gas pressure is within
minimum and maximum on data plate, then check pilot
voltage, 325 millivolts minimum. If the minimum millivolt
reading is not obtainable, replace pilot.
Check
Test To Test
Complete
A
System
B Thermopile
On/Off Switch
ODS Pilot
3
2
1
Connection
1 = TP
2 = TP, TH
3 = TH
Switch
ST1176
Unvented Cast Iron Gas Stoves
Connect Switch or
Meter Leads Thermostat
to Terminals Contacts
2 & 3 Closed
1 & 2 Open
ODS Pilot
Millivolt Valve
Spade Terminal
Meter
Reading
Should Be
Closed
Open
13