THERMOSTAT LOCATION
Millivolt wall thermostats are specially designed for use on
Figure 9
Interior Wall - The thermostat can also be installed on an inside wall away from the furnace but in the same room.
It is important to use wire of a gauge proper for the length of the wire:
RECOMMENDED WIRE GAUGES
Maximum Length | Wire Gauge |
1' to 10' | 18 |
10' to 25' | 16 |
25' to 35' | 14 |
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 10)
A millivolt meter is required to check the system. Millivolt readings should be:
•Across the thermopile terminals,
•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. (Strong winds, dirty pilot and low pres- sure will reduce readings.)
Piezo Pilot Ignitor Instructions
Depressing the button completely causes a spark to occur at the pilot. This is a substitute for a match which requires opening the pilot hole cover.
To light the pilot, it is important that the electrode be 1/8" (3mm) from the thermopile. The spark must occur at the point the burner flame hits the thermopile. The end of the electrode will be red hot with the pilot on.
On a new installation with air in the gas line, it is suggested that a match be used. The match will light the pilot faster than the piezo under this condition.
Figure 10
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