10
Filling loop
Filling Loop
A combi filling loop is required for filling of the heating system and replacing water lost during servicing or bleeding and
should be installed close to the boiler. The loop should be as shown in the diagram and comply with current Water Supply
Regulations. The temporary connection should be removed after filling and the valves sealed with suitable caps.
Ensure that all radiators have air release (bleed) valves installed and that high points in pipe work have an air release
valve (automatic type recommended) installed.
Pressure Relief Valve
The pressure relief valve is set at 3 bar, subsequently all fittings and pipework, etc. must be suitable for pressures in excess of
3 bar and temperature in excess of 100ºC.
The pressure relief valve has a ½” BSP thread for connection via a suitable connector to copper tube and the pressure relief
discharge pipe should not be less than 15mm diameter.
The pressure relief discharge pipe must run continuously downward and discharge outside of the building, preferably over a
drain.
The discharge pipe should be routed in such a manner that it does not present a hazard to occupants or cause damage to
wiring or electrical components.
If the discharge pipe does not terminate over a drain then, the end of the pipe should terminate facing down and towards the
wall.
Under no circumstances should the discharge be above a window, entrance or other public access.
The installer must give consideration to the possibility that boiling water / steam could discharge from the pipe.
If the discharge pipe is to join a common discharge pipe, it must have its own tundish and increase to 22mm dia.
prior to connection to the common discharge pipe.
If the discharge is to join into the common discharge from an unvented cylinder then, it must follow the guidance
of G3 of the Building Regulations.
All installations must be fitted in accordance with all local regulations in force at that time. Failure to comply with these
regulations will invalidate the manufacturers’ warranty.
4.9 (b) PUMP DUTY
Boiler equipped with a high efficiency circulation pump, with a maximum impulsion height of 6.2 m and a maximum flow of
3.3 m³ / h.
There are selectable operation modes with the built-in knob. You can select constant operating speeds I, II and III.
A LED indicator informs about the operating status of the pump
‐
Green: correct operation.
‐
Green / red flashing: Lower voltage U<180V; overvoltage U>253V; Module overheating
‐
Red flashing: pump blocked.
i
Mains water
supply
Heating
system
valve
valve
