Zeus Maior 24 Instructions
The boiler is designed for use in a sealed central heating system. The system should be designed to oper-
ate with flow temperatures of up to 80°C. When designing the system, the pump head, expansion vessel
size, mean radiator temperature, etc. must be taken into account.
The pressure losses in the system must be compatible with the boiler circulation pump. See pump perform-
ance graph below.
Central Heating System
System volume -
The 8 liter expansion vessel incorporated into the boiler is pre-charged to 1.0 bar and
is suitable for a sealed heating system with a maximum water content of 80 litres (18 gal). Above 80 li-
tres, consideration should be given to fitting an additional expansion vessel fitted in the position shown
on the schematic below. To check correct operation of the expansion vessel(s) the system pressure
should not be more than 2.5 bar when the system is at maximum operating temperature.
The boiler is supplied with the following components built in:-
Central Heating Pressure relief valve -
complying with BS 6759 and set to operate at 3 bar. The dis-
charge pipe must be routed clear of the boiler to a drain, so that it can be seen, but cannot cause injury
to persons or property.
A Pressure gauge is included
to indicate the pressure of the central heating system.
Important Note:
In a central heating system where it is possible to shut off system circulation, such as a
system with zone valves or where all radiators are fitted with thermostatic radiator valves, an external by-
pass should be fitted. An optional automatic bypass is available as an accessory for the Zeus Maior 24
boiler. This may be fitted directly to the boiler central heating flow and return connections.
Pump performance curves
