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CAUTION — Do not run wire behind flanges of Header Plate or
in any location where it might be damaged.
Millivolt wall thermostats are specially designed for use on self-
generating systems. They should never be used on line or low
voltage A.C. circuits.
Interior Wall — The thermostat should be installed on an inside
wall away from the furnace but in the same room.
Note: Use 16 gauge wire to prevent excessive loss of millivolts.
Proper operation depends on a good pilot flame. The flame must
cover the top of the thermopile. Cleaning of the pilot orifice and
burner may be required due to spiders.
System Check (Figure 31)
A millivolt meter is required to check the system. Millivolt readings
should be:
• Across the thermopile terminals, 400-450 millivolts with
thermostat OFF.
• Across the thermopile terminals, 150-250 millivolts with
thermostat ON.
• Across the thermostat wires at the valve, less than 30 millivolts
with thermostat ON.
• Across the thermostat wires at the thermostat, less than 5 millivolts
with thermostat ON. (Dirty pilot or low pressure will reduce
readings.)
OPTIONAL THERMOSTAT BRACKET INSTALLATION
1.
Remove outer casing from heater.
2.
Choose which side you'd like the thermostat to be on your
heater. Choose the side with the best air circulation. Using
a hammer and center punch, remove the knockouts on the
chosen side of the heater.
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THERMOSTAT LOCATION
OUTER CASING SIDE
Figure 32
Connect thermostat wires to gas valve as shown in Figure 32.
3. Route the thermostat wire through the center knockout hole
in the outer casing and the center hole in the thermostat
bracket.
Figure 31
Figure 33
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