Vaillant ecoTEC plus SERIES Instructions For Installation And Servicing - page 16
Instructions for installation and servicing ecoTEC plus 0020020828_07
16
ecoTEC plus 438 pressure loss graph
Water pressure loss (metres head of water)
Flow Rate (litres/hour)
1633 l/hr = 20 diff @ 38 kW
Fig. 3.8.4 Pressure loss ecoTEC plus 438
3.17
Open vented heating system
The boiler must be supplied from an unrestricted water
supply taken from a feed and expansion cistern situated
at a maximum height of 27 metres (90ft) above the boiler.
The cold feed must be 15mm minimum size. The vent
must rise continuously and be unrestricted. It is impor-
tant that the relative positions of the pump, cold feed
and open vent are as shown in fig 3.9.
Open (vented) system.
Recommended
relationship between
pump, cold feed and vent.
22 mm (min.)
vent feed and
expansion cistern
15 mm (min.) cold feed
15 mm (min.)
automatic by-pass
450 mm
(min.)
height
1000 mm
(min.)
boiler
150 mm (max.)
return
cylinder
flow
pump
heating
Fig. 3.9 Open vented system
3.18
Sealed water systems
The installation must comply with the appropriate re-
quirements of the current issue of BS4814, BS5449,
BS6759, BS6798 and BS7074 Part 1 and 2. For IE your
attention is drawn to the current edition of IS 813. It is
highly recommend to use the Vaillant Sealed System Kit
Article; 020053207 This includes all necessary compo-
nents and is included in your Vaillant warranty. See also
fig 3.10.
3.18.1 Safety
valve
A safety valve must be fitted to a sealed system. It shall
be preset, non-adjustable with a lift pressure of 3-bar,
incorporating seating of a resilient material, a test device
and a connection for drain. The safety valve discharge
pipe must be routed to outside the building, must not
discharge above an entrance or window or any type of
public access area, be clear of any electrical fittings and
positioned so that any discharge can be seen.
3.18.2 Expansion vessel
A diaphragm type expansion vessel, conforming to the
current issue of BS4814 (see also BS7074 Part 1 and 2).
For IE the current edition of IS 813, must be connected
at a point close to the inlet side of the circulating pump,
see the Typical installation, Fig. 3.10. unless laid down
differently by the manufacturer. The expansion vessel
volume depends on the total water system volume and
the initial system design pressure. For any system an
accurate calculation of vessel size is given in the current
issue of BS5449 and BS7074 Part 1. Example: For an
initial design pressure of 0.7 bar, the minimum total
vessel volume required is 0.063 x Total System Volume.
h
Note!
A higher initial design pressure requires a larger
volume expansion vessel.
The charge pressure must not be less than the static
head of the system, that is, the height of the highest
point of the system above the expansion vessel.
3.18.3 Pressure gauge
A pressure gauge with a set pointer and covering at least
0 to 4 bar (0 to 60 lb/in2) shall be fitted permanently to
the system in a position where it can be seen when filling
the system.
3.18.4 Water make up
Provision should be made for replacing water loss from
the system using a make up bottle mounted in a position
higher than the top point of the system, connected
through a non-return valve to the return side of either
the heating circuit or the hot water cylinder. Alternatively,
provision for make up water should be made using a
proprietary filling loop.
3 General requirements