Boiler Water Connections - Ferroli Optimax 25 C Instructions For Installation, Use And Maintenance Manual

Optimax 25 C

2.3 Boiler water connections

The heating capacity of the unit should be previously established by calculating the building's heat
requirement according to current regulations. For good operation and long life of the boiler, the plum-
bing system must be well proportioned and always complete with all those accessories that guarantee
regular operation and running, room thermostat, trv's and automatic bypass etc. The flow and return
must be a minimum diameter of 22mm for the first 3 meters from the appliance.
If the flow and return pipes follow a path where air pockets could form in certain places, it is esential
to install vent valves at these points. Also, install type "A" drain cock device at the lowest points in the
system to allow complete draining.
The temperature differential between the flow manifold and the return to the boiler should not exceed
20° C.
A minimum flow of 6 litres/min is requied through the heat exchanger, it is therefore essential to fit a
automatic bypass a min of 3 meters away from the appliance, calobrated on site.
Do not use the water system pipes to earth electrical
appliances.
Before installation, carefully flush all the pipes of the heating
system to remove residues or impurities that could affect
the unit's operation (BS 7593 Building regs Doc L).
Make the connections to the appliance as shown in fig. 5.
Key
System flow (22 mm with isolation valve fitted)
1
DHW outlet (15 mm with isolation valve fitted)
2
Gas inlet (22 mm with isolation valve fitted)
3
Cold main inlet (15 mm with isolation valve fitted)
4
System return - 22 mm with isolation valve fitted (c/w filter)
5
System drain
6
Condense outlet
7
It is essential to install the isolation valves supplied between the boiler and heating system, allowing the
boiler to be isolated from the system if necessary.
The safety valve outlet must be connected to a 15mm diameter copper pipe, with a continual
fall from the boiler to allow system water out onto the ground in the event of over-pressure in
the heating circuit. If this is not done, and the drain valve trips and floods the room, the boiler
manufacturer is not to be held responsible. The outlet should face back against the outer bri-
ckwork or building face to prevent harm or injury from hot water discharging in the evet of an
over-pressuried system.
Make the boiler connection in such a way that its internal pipes are free of stress. If a check valve is
installed on the tap water circuit (where applicable), it is necessary to mount a safety valve between the
boiler and this circuit (check valve minimum 3 meters from boiler).
6
1 2 7 3 4 5
40 68 107 77,5 57,5
400
fig. 5
50
11