Emergency Mode - Hamworthy Milborne 500 Series Design Installation, Commissioning And Operating Instructions

12.0 Emergency Mode

Milborne series 500's electronic management system includes an operation mode called "Emergency" mode,
which can be activated in case of malfunctioning of the Master card.
Indeed, to ensure continuous operation of the boiler assembly, the master card can be disabled in such a way as
to have the system operate at a default delivery temperature set by the Manufacturer.
To enable the "Emergency" function, carry out the following procedure:
12.1 Disconnect the 4-pole connector J14 from the
Master card (see figure 12.1)
Slave
12.3 Supply all system circulators with mains current,
using the appropriate switches (see figure 11.2).
12.4 Terminal X1 or Terminal X2 which are part of the
cabling of the J14 connector (disconnected at stage
12.1, above) must be connected to a 24V DC power
supply (see figure 12.3)
WARNING! If several Milborne boilers are
installed in series, one or both of the
terminals (X1 or X2) or both may be connected
to the adjacent boilers.
If this is the case, supply the free terminal
with 24V, for example terminal Xn shown in
figure 13.1 (on next page)
HAMWORTHY HEATING LTD
Figure 12.2
23
MILBORNE 500 SERIES
Master
Figure 12.1
12.2 Set all four J17 switches located on each Slave of
the boiler installation to the OFF position
Master
Figure 12.3
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