Specifications

16 Instructions for installation and servicing ecoTEC
Vessel Volume [L]
Initial system pressure (bar) 1.0 1.5
Pressure relief valve setting (bar) 3.0
Total water content of system litres
25 2.7 3.9
50 5.4 7.8
100 10.9 15.6
125 13.6 19.5
150 16.3 23.4
175 19.1 27.3
200 21.8 31.2
225 24.5 35.1
250 27.2 39.0
275 30.0 42.9
300 32.7 46.8
325 35.7 50.7
350 38.1 54.6
375 40.9 58.5
400 43.6 62.4
425 46.3 66.3
450 49.0 70.2
475 51.8 74.1
500 54.5 78.0
For system volumes other than those given
above, multiply the system volume by the
factor across
0.109 0.156
Table 3.5 Sizing of additional expansion vessel
3.11 Pump specifications
3.11.1 Circulating pump
only ecoTEC plus:
The circulating pump is included in the boiler. The resid-
ual pump discharge height depending on the by-pass
valve is shown in Fig. 3.10.
The operating mode of the 2-step pump can be adjusted
below the diagnosis number “d.19”, see section 8.1.2.
400
300
200
100
0
0 200 400 600 800 1000 1200 1600
Lift
[
mbar
]
Volumeflow
[
l/h
]
1800
1400
2. Step1. Step
Fig. 3.10 Pump specifications ecoTEC plus
only ecoTEC pro:
The circulating pump is included in the boiler. The eco-
TEC pro appliances are fitted with a single-stage pump.
The residual pump discharge height depending on the
by-pass valve is shown in Fig. 3.11.
400
300
200
100
0
0 200 400 600 800 1000 1200 1600
Lift
[
mbar
]
Volumeflow
[
l/h
]
1800
1400
Fig. 3.11 Pump specifications ecoTEC pro
3.11.2 System by-pass
An automatic system by-pass is provided in the boiler.
The boiler is suitable for use in systems with thermostat-
ic radiator valves and no additional by-pass is required.
The by-pass valve is adjustable, see section 5.8.
3.11.3 Venting
The boiler is fitted with an automatic air vent. Additional
provision should be made to enable the heating system
to be vented during filling and commissioning either by
automatic air vents or manually.
3.12 Condensate trap
The boiler is fitted with a siphonic condensate discharge
(ecoTEC plus) or a condensate trap (ecoTEC pro) incor-
porating a water trap of 140 mm.
4 Boiler installation sequence
4.1 Required minimum distances/assembly clear-
ances
min
min 5
min 5
min 500**
min 180
165/246*
Fig. 4.1 Distances during installation (dimensions in mm)
The boiler should be mounted on a flat and vertical area
of wall of sufficient area for the boiler plus the required
clearances for installation and servicing (fig. 4.1). These
are shown on the installation template supplied with the
boiler and are:
3 General requirements
4 Boiler installation sequence