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Heat exchanger
The heat exchanger (type 2-pass) is mounted on the chassis.
To ensure proper heat transfer of the combustion gases, the
copper fin tubes are arranged side by side and expanded
laterally into a mounting plate. The baffles on the copper fin
tubes optimize the efficiency of the heat exchanger. The stain-
less steel supply and return pipes together with the water mani-
folds form the heat exchanger and is pressure tested at 16
bar. The R18 water heater is supplied with a primary pump,
to ensure the optimum flow rate and a bypass (see fig. 8).
Fig. 7
Heat exchanger
Primary pump
The primary circulating pump is sized to prevent the depositing
of limescale in the water heater under the following conditions.
Water hardness in ppm
0 - 80
80 - 250
250 - 350
350 - 500
Table 2 Maximum temperature
Fig.8
Pump and bypass with water connections
18IP22B
Maximum temperature in °C
90
85
80
60
7
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