1. Generation of pressure

   The cold water will be taken from the water tank and raised to the required pressure by means of a 3 piston crankshaft pump.
   

2. Heating up the water
   Via an “Unloader” valve the water under pressure will be pumped to the TEHA- combustion chamber, where it will be heated either by gas or by oil .
   

3. Regulation of pressure and water quantity
   The pressure and the water quantity are being regulated by an “Unloader” valve. The water quantity reduces simultaneously if the pressure is reduced. The non-used water will be diverted by means of a bypass.
   
4. Regulation of the temperature
   A thermostat regulates the temperature. It cuts off the burner, if the adjusted temperature has been reached. It re-starts the burner when the temperature has fallen by approx. 46 °F.
   
5. Safety device
   The following devices guarantee the safety of the machine:
   
   • The safety valve releases the excess pressure, in case of excessive increase of pressure .
   • The temperature limiting safety device with flue gas sensor cuts off the burner if an excessive flue gas temperature is reached .
   • The flow switch starts the burner if the water quantity is sufficient and cuts it off if the water quantity is not sufficient .
   • The pressure switch sets the burner free only if the minimum pressure has been reached .

   All mentioned switches are connected in series. That means that the burner will not start, if any one of the switches does not connect through. Thus the best possible safety will be guaranteed .
   

6. Cut off of pressure
   The machine is equipped with a pressure cut off, which cuts off the pump motor if the spray pistol is closed and which starts when it is opened .

Range of performance

 
Reduced quantities of water produce higher temperatures .