DO – Diathermal horizontal oil boiler

DO models are thermal oil heaters. Internal coils are fed by the circulation pump.

Mineral oils with following properties are recommended:

• maximum allowable film temperature at least 50°C higher than oil outlet temperature from heater
• high resistance to oxidation at temperatures over 60/70 °C (do not let the temperature in the expansion tank exceed these values)
• resistance to ageing
• low vapor pressure
• high specific heat
• high thermal conductivity
• low viscosity
• non-scouring characteristics
• non-toxic characteristics
• high flash point
• low slip point
• Syntetic oils can be used too

Our DO thermal oil heaters have been designed in order to guarantee:

• high efficiency (in the range of 88%) due to large heated surface
• three smoke passes design
• easy maintenance and service due to completely openable front/rear doors also allowing easy change of the coil

The oil temperature is controlled with temperature sensor connected to an electronic oil temperature controller; in  case of high temperature the burner is switched off.

1. Corpo caldaia / Boiler / Generateur / Cuerpo caldera
2. Portellone / Front door / Hayon Frontal / Puerta anterior
3. Piastra sostegno bruciatore / Burner plate / Plaque de brûleur / Placa del
   quemador
4. Spia controllo fiamma / Combustion control / Contrôle de la combustion /
   Control de la combustión
5. Uscita fumi / Smoke outlet / Évacuation de fumée / Evacuación de humos
6. Pressostato differenziale / Differential pressure switch / Différentiel
   interrupteur de pression / Presostatos diferencial
7. Manometro / Manometer / Manomètre / Manómetro
8. Gruppo di scarico / Discharged unit / Unité de décherge / Grupo de descarga
9. Targa dati / Name plate / Plaque / Placa de datos tecnicos
10. Quadro elettrico / Electrical panel / Panneau électric / Cuadro eléctrico