HAMWORTHY HEATING LTD
29
MILBORNE
500001130/J
8.2.7. Connection to temperature control devices
Milborne boilers are fitted with a versatile control and
management system, which can manage up to three
independent circuits operating at different
temperatures.
Figure 4.6 shows the main devices (temperature
sensors, circulators, valves, etc.) which form the
three circuits which can be, directly controlled by the
boiler controls.
Note:
Temperature sensors for the secondary circuits
are optional extras and must therefore be specified
when requesting quotations and placing orders.
Programmable room thermostats for low and high
temperature heating circuits are 24hr day
programmable.
8.2.8 Outside Air Sensor Connection
If outside temperature compensation is to be used,
the outside air sensor needs to be connected to
terminals no. 7 and 8 (figure 4.6).
The outside air sensor shall be installed on an
outside wall, North or North/East aspect, at a
minimum height of 2.5 metres, away from windows,
door, and ventilation grilles and flue discharges.
Never install the probe in a position exposed to the
sun or other forms of radiated heat.
Note: the outside sensor is also required to facilitate 2
stage frost protection and Summer Shutdown control.
8.3 Emergency Mode
The Milborne boilers incorporate a function which
can be activated in the case of a mal-function of the
Master control -
Emergency Mode.
Once enabled, this ensures that the system will
operate at a default delivery temperature set by the
Manufacturer.
8.3.1 Disconnect the 4 pole connector J14 from the
Master pcb - see figure 8.3.1
8.3.2. Set all four J17 switches located on each Slave
to the OFF position - see figure 8.3.2
8.3.3. Supply all system pumps with mains via the
appropriate contactor hand auto switch
8.3.4. Terminal X1 or Terminal X2 which are part of
the cabling of the J14 connector ) must be connected
to a 24V DC power supply (see figure 8.3.3)
WARNING! If several Milborne boilers are
installed in series, one or both of the
terminals (X1 or X2) may be connected to the
adjacent boilers. If this is the case, supply
the free terminal with 24V, for example
terminal Xn - see figure 8.3.3.
Slave
Figure 8.3.2
MASTER
Cod. SCHEDA39
B
A
RCO
D
E
J7
J6
J5
J4
J3
BUS J14
1
2
3
4
MC
J2
T1
J1
PC
R6
R5
R4
R3
R2
R1
J10
J8
1
2
3
F1 FUSE 3.15A
3
4
1
2
J11
8
J12
6 5 4 3 2 1
5 4 3 2 1
9 10 11 12 13
1
2
3
4
5
6
7
14
Plug J14
MASTER
Cod. SCHEDA39
B
A
RCO
D
E
J7
J6
J5
J4
J3
BUS J14
1
2
3
4
MC
J2
T1
J1
PC
R6
R5
R4
R3
R2
R1
J10
J8
1
2
3
F1 FUSE 3.15A
3
4
1
2
J11
8
J12
6 5 4 3 2 1
5 4 3 2 1
9 10 11 12 13
1
2
3
4
5
6
7
14
Plug J14
Figure 8.3.1
MASTER
Cod. SCHEDA39
BA
R
C
OD
E
J7
J6
J5
J4
J3
BUS J14
1
2
3
4
MC
J2
T1
J1
PC
R6
R5
R4
R3
R2
R1
J10
J8
1
2
3
F1 FUSE 3.15A
3
4
1
2
J11
8
J12
6 5 4 3 2 1
5 4 3 2 1
9 10 11 12 13
1
2
3
4
5
6
7
14
24Vcc X 1
X 2
Plug J14 disconnected
1
2
3
4
Figure 8.3.3