System By-Pass; Venting; Condensate Trap - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

3 General requirements
400
300
200
1. Step
100
0
0 200 400 600
Fig. 3.10.1 Pump specifications ecoTEC plus
(except ecoTEC 637 and 837)
400
300
200
1. Step
100
0
0 200 400 600 800 1000 1200
Fig. 3.10.2 Pump specifications only ecoTEC 637 and 837
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
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 thermo-
static radiator valves and no additional by-pass is
required. The by-pass valve is adjustable, see section 5.8.
16
2. Step
800 1000 1200 1400 1600
Volumeflow [ l/h ]
2. Step
1400 1600 1800
Volumeflow [ l/h ]
800 1000 1200 1400 1600
Volumeflow [ l/h ]

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.
1800
2000
1800
Instructions for installation and servicing ecoTEC / 839592_09