17ecoTEC plus 937 installation and maintenance manual
3.10.7 Shift load storage tank expansion vessel
The shift load storage tank is fitted with a 1 litre
expansion vessel.
3.11 Details for the pumps
3.11.1 Circulation pump
The circulation pump is integrated in the combi boiler.
The remaining head of the pump with respect to the
bypass valve is shown in Fig. 3.8.
The operating mode of the 2-speed pump can be
adjusted using diagnostic 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
2000
Fig. 3.8 Technical data of the pump in the combi boiler
3.11.2 Shift load storage tank circulation pump
The shift load storage tank is equipped with a
maintenance-free charging pump.
3.12 System-Bypass
The boiler is fitted with an automatic system by-pass.
The installation can be used in systems with
thermostatic radiator valves without the need for an
additional by-pass. The by-pass valve is adjustable, see
Section 5.8.
3.13 Venting
The boiler is fitted with an automatic air vent. Other
measures need to be taken to allow the heating system
to be either automatically or manually vented during
filling and during commissioning.
3.14 Condensate siphonic trap
The boiler is fitted with a siphonic condensate trap
incorpaorating a water seal of 145 mm.
General requirements 3
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