STIEBEL ELTRON WPE-I 04 H 230 Premium, Operation And Installation

Page: 12 / 48

INSTallaTION
Installation
12 | WPE-I H(K) 230 Premium www.stiebel-eltron.com
9.6 Oxygen diffusion
!
Material losses
Do not use open vented heating systems. Use oxygen
diffusion-proof pipes in underfloor heating systems with
plastic pipework.
In underfloor heating systems with plastic pipes that are per-
meable to oxygen and in open vented heating systems, oxygen
diffusion may lead to corrosion on the steel components of the
heating system (e.g. on the indirect coil of the DHW cylinder, on
buffer cylinders, steel radiators or steel pipes).
f f
With heating systems that are permeable to oxygen, separate
the heating system between the heating circuit and the buff-
er cylinder.
!
Material losses
The products of corrosion (e.g. rusty sludge) can set-
tle in the heating system components, which may re-
sult in a lower output or fault shutdowns due to reduced
cross-sections.
9.7 Filling the heating system
Heating water quality
Carry out a fill water analysis before filling the system. This analy-
sis may, for example, be requested from the relevant water supply
utility.
!
Material losses
To avoid damage as a result of scaling, it may be neces-
sary to soften or desalinate the fill water. The fill water
limits specified in chapter "Specification / Data table"
must always be observed.
f f
Recheck these limits 8-12 weeks after commission-
ing and as part of the annual system maintenance.
Note
With a conductivity > 1000 μS/cm, desalination treatment
is recommended in order to avoid corrosion.
Note
Suitable appliances for water softening and desalinating,
as well as for filling and flushing heating systems, can be
obtained from trade suppliers.
Note
If you treat the fill water with inhibitors or additives, the
same limits apply as for desalination.
Filling the heating system
!
Material losses
f f
Never switch on the power before filling the system.
!
Material losses
High flow rates or water hammer can damage the ap-
pliance.
f f
Fill the appliance at a low flow rate.
In the delivered condition, the diverter valve of the MFG is posi-
tioned at the centre. This ensures the heating and DHW circuits
are filled equally. If the power is switched on, the diverter valve
automatically moves into the central heating position.
If you intend to fill or drain the system later, first return the diverter
valve to its centre position.
f f
Activate the parameter.
Parameter
DRAIN HYD (DIAGNOSIS /.RELAY TEST SYSTEM)
1
D
00000
36
14
9
1 Drain, heating side
f f Fill the heating system via the drain. Refer to the section "De-
termining fill pressure".
Determining the fill pressure
The diaphragm expansion vessel installed in the appliance has a
volume of 24 litres. The pre-charge pressure P0 is 1.5 bar.
If the height difference ∆h between the highest point of the heat-
ing system and the diaphragm expansion vessel is no more than
13 m, the diaphragm expansion vessel can be used without any
changes being required.
f f Fill the heating system to a pressure of at least 1.8 bar
(P0 + 0.3 bar). Observe the safety valve's response pressure
of 3 bar.
If the height difference between the highest point of the heating
system and the diaphragm expansion vessel is more than 13 m,
the pre-charge pressure needs to be adapted.
f f
Calculate the pre-charge pressure:
P0 =
∆h
10
+ 0,2 bar
D
00000
81
23
0
f f Note that the heating system fill pressure increases accord-
ingly.
f f Check whether a further external diaphragm expansion ves-
sel needs to be installed.
f f
Fill the heating system to the appropriate pressure
(P0 + 0.3 bar). Observe the safety valve's response pressure
of 3 bar.