3
4.5 The heater is a self-contained heating device
and consists of the following main parts (figure 2):
- Frame (position 1);
- Heat exchanger (position 2);
- Air pump (position 3);
- Control unit (position 4);
- Glow plug (position 5);
- Flame indicator (position 6);
- Heat sensor of incoming liquid (overheating sensor)
(position 7);
- Heat sensor of outgoing liquid (position 8).
Fig. 1. The electric circuit diagram
of «PRAMOTRONIC 16WD-24» heater
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