Ferroli i25 Instructions For Use, Installation And Maintenance - I25 / I29
i25 / i29
4
EN
cod. 3541I730 - Rev. 02 - 11/2016
3.3 Plumbing connections
Important
The heating capacity of the unit must be previously established by calculating the build-
ing's heat requirement according to the current regulations. To ensure proper operation
and long boiler life, the plumbing system must be adequately sized and complete with all
the necessary accessories, including a room thermostat, a thermostattable valve (TRV)
etc. The system delivery and return pipes must have a diameter of at least 22 mm for the
first 3 m of length from the unit.
If the system delivery and return pipes follow a path where air pockets can form in certain
places, it is advisable to install vent valves at these points. Also, type "A" drain cocks
must be installed at the lowest points in the system to allow complete emptying.
B
An automatic bypass with flow rate of at least 6 l/min. must be installed (con-
nected as far away as possible from the boiler) if radiators with thermostatic
valves have been connected.
fig. 7 - Automatic bypass connection
The temperature drop between the delivery manifold and the return to the boiler should
not exceed 20°C.
B
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the heating system to remove any re-
siduals or impurities that could affect proper operation of the unit (as required by BS 7593
Building regs Doc L).
Carry out the connections to the unit as indicated in fig. 34.
B
The safety valve discharge must be connected to a 15 mm diameter copper pipe descending
from the boiler to run off system water in case of overpressure in the heating circuit. Other-
wise, the boiler manufacturer cannot be held liable if the discharge valve operates and floods
the room. The discharge must be run to the outside of the building to prevent the risk of dam-
age or injury caused by discharged hot water in case of overpressure in the system.
Connections to the boiler are to be made in such a way as to ensure that its internal pipes and fittings
are free of stress. If a non-return valve is installed also on the DHW circuit (if provided for), it is necessary
to install a safety valve between the boiler and circuit (with non-return valve at least 3 metres from the
boiler) or an expansion tank for domestic use.
Isolation valve kit
The isolation valves supplied (see fig. 8) must be installed between the boiler and heat-
ing system to allow the boiler to be isolated from the system if necessary.
fig. 8 - Isolation valve kit
A
Flow isolation valve 3/4”
B
Domestic hot water outlet elbow 1/2”
C
Gas cock 1/2” (yellow)
D
Cold water inlet valve 1/2”
F
Return isolation valve 3/4”
Make up water
Provision must be made for replacing water lost from the sealed system. Reference
should be made to BS6798, for methods of filling and making up sealed systems. There
must be no direct connection between the boiler's central heating system and the mains
water supply. The use of mains water to charge and pressurise the system directly, is
conditional upon the Local Water Byelaws. Again any such connection must be discon-
nected after use. Ensure the filling point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
FILLING LOOP IN fig. 17 IS NOT SUPPLIED WITH BOILER.
The maximum domestic water pressure for the inlet supply is 9 bar (130 P.S.I.). If the
cold mains supply exceeds 5 bar (72 P.S.I.), a water governor or pressure reducing valve
must be fitted by the installer into the mains supply in an inconspicuous but accessible
position preferably between 3 and 5 metres (10-16ft) before the appliance. Such a valve
must be approved by WRAS. The fitting of a DHW expansion vessel is also recommend-
ed.
Water treatment
If treatment of the water is necessary, Ferroli recommends the exclusive use of specific
products such as Fernox or Sentinel to be applied in compliance with the producer's in-
structions. For more information, please contact:
A
If the boiler is installed in an existing system, it is necessary to remove any un-
suitable additives by thoroughly cleaning the system. Cleaning of all the sys-
tems must be carried out in compliance with the provisions of Standard B.S.
7593.
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains
fig. 9 - FILLING LOOP (NOT SUPPLIED WITH BOILER)
Key
1.
C.H. filling valve
2.
Temporary connection
3.
Cold water supply valve
4.
Double check valve
Fernox Manufacturing Co. LTD.
Cookson Electronics, Forsyth Road
Sheerwater, Woking, Surrey, GU21 5RZ
Tel.: 0870 8700362
Sentinel Performance Solutions Ltd
The Heath Business & Technical Park
Runcorn, Cheshire WA7 4QX
Tel.: 0151 424 5351
B
C
D
F
A