andrews R18 Series, Техническая документация инструкция

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18IP22B
24
Fig. 20 TP 50 - 30
5.2.3.1 Water system
5.2.3.2 Pump information
The following notes are of particular importance to these water
heaters.
A drain tap is fitted to the header at the connection end of the
water heater to drain the content of the heat exchanger.
The water connections are normally on het right hand side of
the water heater but can be supplied on the left hand side by
special order, i.e. standard or alternative handing.
To prevent temperature lag time at the tappoint and to keep the
water temperature uniform a suitable sized recirculation pump
must be fitted.
Water treatment and suitable filtration is recommended for
these water heaters and advice should be obtained from a
reputable source.
The primary circulating pump is sized to prevent the depositing
of limescale in the water heater under the following conditions:
Water hardness in ppm Maximum temperature in °C
0 - 80 90
80 - 250 85
250 - 350 80
350 - 500 60
Table 4 Maximum temperature