- 11 -
vessel is pre-charged to 1.2 bar and guarantees
operation up to a heating system capacity of 140
litres operating at a maximum of 85°C (220 litres
Mital max & Montreux max) and with a static head of
up to 12 metres.
Filling of the system must be via a temporary hose
connection to the mains water supply, with a double
check valve assembly and test point on the system
side of the temporary connection. As per Water
Regulation Bye-law 14.
All valves and joints should be suitable for a working
pressure of 3 bar. Radiator valves should comply with
BS 2767:10. All other valves and fittings should
comply with BS1010.
The discharge from the Safety Valve MUST be run to
a safe position outside of the building. REMEMBER
the discharge from the safety valve will be HOT and
must be discharged at low level.
All boilers have an integral three speed pump built
into the boiler. In most cases Speed - lll is suitable. If
a greater pump is required this can be achieved by
replacing the standard pump with the larger pump
(see accessories).
Figure 12a - Mital, Mital plus boiler
Resistance & Pump diagram.
0
0.1
0.2
0.3
0.4
0.5
0.6
0
200
400
600
800
1000
1200
1400
1600
1800
Ltr/hr
Ba
r
Pump Duty
Boiler Resistance
2
1
3
Figure 12b - Mital max boiler Resistance &
Pump diagram.
0
0.1
0.2
0.3
0.4
0.5
0.6
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Ltr/hr
Ba
r
Pump Duty
Boiler Resistance
2
1
3
Figure 12c - Montreux, Montreux plus boiler
Resistance & Pump diagram.
0
0.1
0.2
0.3
0.4
0.5
0.6
0
200
400
600
800
1000
1200
1400
1600
1800
Ltr/hr
Ba
r
Pump Duty
Boiler Resistance
2
1
3
Figure 12d - Montreux max boiler
Resistance & Pump diagram.
0
0.1
0.2
0.3
0.4
0.5
0.6
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Ltr/hr
Bar
Pump Duty
Boiler Resistance
2
1
3
13.0 Electrical System
External wiring MUST be in accordance with current
I.E.E. Regulations and all other Local Regulations.
The boiler is supplied for 230 VAC, 50Hz, Single
Phase.
The method of connection to the electricity supply
must facilitate complete isolation of the boiler. This
can be achieved either by use of a fused three-pin
plug and shuttered socket outlet, both complying with
BS1363, or by use of a fused-double pole switch with
a contact separation in both poles of at least 3mm.
Which ever method is used the point of disconnection
of the electricity supply must be adjacent to the
boiler, with the exception of boilers that are fitted in
either a bathroom or shower room. In these cases the
point of disconnection MUST be outside the
bathroom and it is advised that the method of
disconnection should include removal of fuse to avoid
accidental re-connection.
