Operating Principle And Other Functions; Operating Principle - Carel gaSteam 45 Manual Del Usuario

7. OPERATING PRINCIPLE AND OTHER FUNCTIONS

7.1 Operating principle

In a gas humidifi er the production of steam is obtained inside a boiler containing water that is heated to
and then held at boiling temperature. The heat required to boil the water is provided by a heat exchan-
ger, heated by a type C pre-mix modulating room-sealed gas burner (standards compliant), which takes
in air for combustion and discharges the fl ue gas to the outside through suitable piping.
This unit is therefore suitable for environments where there is not suffi cient fresh air.
The operation of the burner is completely automatic and does not use a pilot fl ame.
All the operating phases of the burner are controlled by an electronic board, which also constantly
checks the presence of the fl ame by ionisation. The output of the burner continuously responds to the
request for heat, according to an ample modulation ratio (1:4).
The variable speed fan (managed by the control board), together with the proportional gas valve,
allows the output to be modulated (the fl ow-rate of gas is proportional to that of the air required for
combustion).
The water that evaporates over time is automatically replaced with water from the mains supply.
In stable operating conditions, the level of production required is automatically controlled by adjusting
the thermal output of the burner.
The salts introduced by the automatic refi lling of the water are partly deposited as lime scale inside the
boiler, contributing to the progressive depletion of the cylinder, and partly remain dissolved in the water.
To avoid excessive accumulation of salts, a quantity of water is periodically and automatically drained
and then replaced with fresh water.
For further information on operation, see the pHC controller manual (code +030220534).
gaSteam HARDWARE +030220538 - rel. 1.4 - 22.01.2008 21