~
15 ~
The thermostat is a safety device. It automatically closes the air inlet when the water
temperature is more than 85±3
℃
, so that the water doesn’t get too hot. And it automati-
cally opens the air inlet to the set open position when the water temperature is lower
than 80±3
℃
. This way the thermostat makes the water temperature not change too
much.
WATER HEATING SYSTEMS DIAGRAM
For HFB-332/HFB-243
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For HFB-443
Note: This diagram illustrates the basic principal of water heating systems and must not
be regarded as a working drawing.