15
4.4 - Characteristic
curves of heating
system’s residual
head
45WN and 45WE boilers are fitted with
its own specific circulator pump. The
residual head at the boiler connections
is shown in graph form in figure 5.
4.5 - Boiler head
loss curve
45AN and 45AE boilers are not fitted
with an internal pump. The installer
needs to install an external pump as
illustrated in figure 17, item “6”. Use
the graph in figure 6 to choose the
correct pump.
4.6 - Characteristic
curve of the
domestic side
45WN and 45WE boilers, offers certain
resistance to the passage of the
domestic water (see graph flow/
pressure of figure 7). The installer or
the engineer must take account of this
in order to ensure the correct domestic
water flow to the utilities.
Figure 5 - Residual Head for heating circuit for models “45WN”
and “45WE”
Figure 6 - Boiler Head Loss for models “45AN” and “45AE”
Figure 7 - Domestic Water Coil Head Loss for models “45WN”
and “45WE”
4 - FUNCTION OVERVIEW
Summary of Contents for ONEX
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