~
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 automatically 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.