29
SETTINGS
Bypass
The built-in bypass must be adjusted according
to the requirements of the system. Refer to the flow
rate pressure curve (
diag. 19 p. 11
) The boiler is
supplied with the built-in bypass valve open half
a turn. It is adjusted by turning the bypass screw
(
a
diag.
60
) . Turn the screw clockwise to close the
bypass.
When using thermostatic radiator valves (TRV's), a
separate adjustable bypass of 15 mm minimum
diameter must be fitted between the flow and
return of the heating circuit. Any bypass must be
fitted before system controls.
If desired
the pump can be made to run when the
burner is lit and will continue to run after burner
extinction. This can be useful on certain installa-
tions that requireconstant heating water circula-
tion.
To change the pump operation to continuous, it is
necessary to place the electrical jumper on the
PCB in the “C” position, see
diagram 61
.
Diagram. 60
a
Reg 013
Reg 004
Reg 003
C
ontinuous pump
As the boiler is supplied, the pump operation is conven-
tional, that is, the pump will operate when the burner is lit
during a central heating demand.
Diagram. 61
Should it become necessary to change the gas
type, a modification kit composing injectors, pilot
assembly and factory set gas valve will be
required. This modification can only be carried out
by an authorized and suitable qualified engineer.
CHANGING GAS TYPE
