Combustion Fan Top Tube
Top Tube
The top tube is located across the top of the fire box and is attached to the combustion
fan. Its purpose is to allow the air to pass through the holes running along the tubes
length and evenly distribute it around the fire box. These will commonly get warped
and burnt through due to overloading of the firebox.
Thermostat
Description
The thermostat is used to monitor and regulate the temperature of the heat exchange
through the use of the main fan.
Operation
Within the ‘stat’ there is a silver dial which reads the heat exchange temperature on
older models this was done in Fahrenheit on newer models this is done in Celsius (the
bottom point of silver dial is the current temp). The top pin (furthest right) is the over
temp this is commonly set at 200’F (90
o
C) if the stat has a red reset button and this
temperature is reached the fan will need to be reset to run correctly in older appliances
the over temp setting is inactive. The middle pin indicates when the fan will activate
when in it’s automatic setting this is normally set at 150’F (60
o
C), the lowest pin
indicates when the main fan will cut off which is normally set at 100’F (30
o
C).
The ‘stat’ will only work in this way when the white push knob is pulled out leaving it on
its automatic setting. When this knob is pushed in the ‘stat’ will be on its manual setting
which will cause the fan to run constantly.
When the appliance has switched off in fire out the thermostat will still activate the main
fan if the temperature exceeds the middle pins set point.
On newer models there is also a read reset button on the right hand side. This will
need to be pressed in if the appliance has gone over temperature.
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