Electrical Wiring; Connecting Optional Wall Switch Or Thermostat; Checking System Operation - Monessen Hearth CSVF20SNV Installation And Operating Instructions Manual

ELECTRICAL WIRING (MILLI-VOLT)
The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE.
Label all wires prior to
disconnection when
servicing controls. Wiring
errors can cause improper
and dangerous operation.
Verify proper operation
after servicing.
CONNECTION
1 = TP
2 = TP, TH
3 = TH

CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT

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 or thermostat. At the other end, connect one wire to
TP/TH and one wire to TH, or connect the wall switch/thermostat to the two male (0.25") terminals on the left side of
the unit. The color of the wires does not matter.

CHECKING SYSTEM OPERATION

The millivolt system and individual compo-
nents may be checked with a millivolt meter
having a 0-1000mv range. Conduct each
check shown in chart by connecting meter
test leads to terminals as indicated.
A. COMPLETE MILLIVOLT SYSTEM CHECK
("A" Reading - Thermostat contacts CLOSED - Control Knob "ON" - Main Burners should turn ON)
a. If the reading is more than 175 millivolts and the automatic valve still does not come on - replace the valve.
b. If the closed circuit reading ("A" reading) is less than 175 millivolts, determine cause for low reading - proceed as
follows:
B. THERMOPILE OUTPUT READING CHECK
("B" Reading - Thermostat contacts OPEN - Main burner OFF)
Check gas pressure to the unit. If gas pressure is within minimum and maximum on data plate, then replace pilot. If the minimum
millivolt reading is not obtainable, replace pilot.
16
Wall
Switch
Optional Wall
Switch, Wall Thermostat,
Thermostat Sensor or
Remote
Figure 12 - Wiring Diagram
CHECK
TEST
A
B
On/Off
3
Switch
1
2
CONNECT
TO METER
TEST LEADS TO
TERMINALS
COMPLETE
SYSTEM
THERMOPILE
OUTPUT
ODS Pilot
On/Off
Switch
ODS
Pilot
Switch
THERMOSTAT
CONTACTS
2 & 3 CLOSED
1 & 2 OPEN
Millivolt
Valve
Spade Terminal
METER
READING
SHOULD BE
MINIMUM
175mv
500mv
OR MORE
58D6002