HK 50 M – HK 10M – HK 100S SERVICE BULLETIN1.7.2 Main heat exchangerIn order to bond 321 stainless steel pipe on the copper pipe inside the exchanger and increase the heatingsurface of the pipe, the bimetallic pipe is composed of threads with specific pitches. The heat exchanger isformed by wrapping the outer body around the inner wall. (Figure 1.5)1.7.3 Combustion chamberThe cylinder shaped upper valve part is the body made of aluminum casting, including a heat exchangerwithin. (figure 1.6) HK 50 M type has 1 piece, HK 100M and HK 100S types have 5 pieces. (Figure 1.5)1.7.4 Flame ignition and detection electrodeThe electrode is mounted on the upper left side of the combustion chamber. Its function is to enable ignitionby creating a high-voltage spark near the burner. Its second task is to detect the presence of flame (Figure1.7).Service Administration 8 03/2010
