Operating instructions

Page 12
Victrix Zeus 20/27 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 10 litre 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 100 litres. Above 100 litres, consid-
eration should be given to fitting an additional expansion vessel. To check correct operation of the expan-
sion vessel(s) the system pressure should not be more than 2.5 bar when the system is at maximum operat-
ing 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 discharge
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.
Pump performance curves
Flow—Head Graph:
The pump head depends on how the system bypass is adjusted.
A. Head available at max pump speed with by-pass closed (adjustment screw fully screwed in)
B. Head available at max pump speed (screw tightened 4 to 5 turns - bypass partially open)
C. Head available at max pump speed with by-pass open (adjustment screw fully unscrewed)
Victrix 27 Victrix 20