Electrical Wiring (Milli-Volt) - Martin VENT-FREE FIREPLACE SYSTEMS 33ISDG Installation And Operating Instructions Manual

Vent-free fireplace systems
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The milli-volt valve is a self-powered combination gas control
THAT DOES NOT REQUIRE 110 VAC TO OPERATE.
Wall
Switch
On/Off
Switch
TH = 3
TP/TH = 2
See Figure 20 and installation instructions
provided with optional wall switch, thermo-
stat or remote control for wiring instructions.
A maximum length of 15 feet of 18awg two
conductor wire is to be used for wall switch
or thermostat installations.
Note thermostats and switches must
be suitable for milli-volt operation.
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.
23D8036
TP = 1
Figure 20 - Wiring Diagram

ELECTRICAL WIRING (MILLI-VOLT)

Label all wires prior to disconnection
when servicing controls. Wiring
errors can cause improper and
dangerous operation. Verify proper
operation after servicing.
On/Off
Switch
ODS
Pilot
Switch
Millivolt
Valve
Spade
Terminal
ODS
Pilot
Optional Wall
Switch or Remote
Receiver
19

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