DOMIcondens HE 26 C
5
EN
cod. 3540Z852 - Rev. 01 - 08/2012
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. 8.
fig. 8 - Plumbing connections
Shutoff valve kit
Make sure to install the shutoff valves (supplied) between the boiler and the heating sys-
tem, allowing the boiler to be isolated from the system if necessary.
B
The safety valve outlet must be connected to a copper pipe of 15 mm diameter
with continuous fall from the boiler to run off the system water in case of over-
pressure in the heating circuit. Otherwise, if the discharge valve cuts in and
floods the room, the boiler manufacturer cannot be held liable. The drain must
be run to the outside of the building to avoid the risk of damage or injury due to
the hot water in case of overpressure in the system.
Make the boiler connection in such a way that its internal pipes 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 the circuit (with the non-return valve at least
3 m from the boiler) or an expansion tank for domestic use.
For installation, follow the instructions contained in the kit.
Replenishing water
It is necessary to provide for replenishing of the water lost by the sealed system. Refer
to
standard BS6798
for the methods of filling and replenishing water in sealed systems.
There must not be a direct connection between the central heating system of the boiler
and the water mains. For the use of water coming from the water mains and direct pres-
surisation of the system, refer to the local water management by-laws. This connection
must be interrupted after use.
The boiler comes standard with the connection (filling loop) shown in fig. 9. For installa-
tion, follow the instructions given on the instruction sheet enclosed with the kit
To replenish the water in the system:
•
Fix the removable
connection “1”
between the two valves.
•
Open the two cocks
“2 and 3”
until the pressure read on the water gauge is approx.
1 bar.
•
Close the two cocks
“2 and 3”
.
•
At the end of the operation, remove the removable connection
“1”
.
Reference is made to the provisions contained in the water management by-laws.
fig. 9 - Filling loop
Water treatment
If water treatment is necessary, Ferroli recommends the exclusive use of specific prod-
ucts such as Fernox or Sentinel to be applied according to the producer's instructions.
For further information, please contact:
A
If the boiler is installed in an existing system, any unsuitable additives must be
removed by thoroughly cleaning the system. Cleaning of all the systems must
be done in compliance with the requirements of standard B.S. 7593.
A
In areas with hard water, treatment may be necessary in order to prevent scale
from forming in the boiler.
A
Make sure to use the water treatment product in the right concentration, accord-
ing to the producer's instructions.
3.4 Gas connection
The gas must be connected to the relevant union (see figure on cover) in conformity with
the current regulations, with a rigid metal pipe or with a continuous surface flexible s/steel
tube, installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains
36 60 60
89
95
60
204
158
1
3
6
5
2
4
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
Содержание DOMIcondens HE 26 C
Страница 13: ......
