Open Vented Heating System - Vaillant ecoTEC plus Instructions For Installation And Servicing

ecoTEC plus 415 pressure loss graph
Flow Rate (litres/hour)
Fig. 3.8.1 Pressure loss ecoTEC plus 415
ecoTEC plus 418 pressure loss graph
Flow Rate (litres/hour)
Fig. 3.8.2 Pressure loss ecoTEC plus 418
ecoTEC plus 428 pressure loss graph
Flow Rate (litres/hour)
Fig. 3.8.3 Pressure loss ecoTEC plus 428
Instructions for installation and servicing ecoTEC plus / 0020020828_05
646 l/hr = 20 diff @ 12 kW
773.86 l/hr = 20 diff @ 18 kW
1220 l/hr = 20 diff @ 30 kW
General requirements 3
ecoTEC plus 438 pressure loss graph
Flow Rate (litres/hour)
Fig. 3.8.4 Pressure loss ecoTEC plus 438
3.16

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.
450 mm
(min.)
height
1000 mm
(min.)
boiler 150 mm (max.)
Fig. 3.9 Open vented system
1633 l/hr = 20 diff @ 38 kW
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
pump
13