Start-Up 6; Water Circulation System; Filling The System; Preparation Of Heating Water - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

6 Start-up
a Caution!
The boiler must only be operated with its
casing properly and permanently closed!
Otherwise, under unfavourable conditions, it
can result in material damage or even injury or
death.
Note!
h
When starting up particularly take the following
into consideration:
Before the heating circuit or charging circuit is
filled you must open the cap on the automatic
air vent which must remain open during
subsequent operation.
Use the bleeding program to bleed the heating
circuit or charging circuit (see Chap. 9.2).
6.1

Water circulation system

Detailed recommendations concerning the water circuit
system can be taken from BS 6798 and BS 5449, Part 1
(for "Small Bore" and "Micro Bore" central heating
systems). Lines which do not form part of the usable
heating surface should be insulated to prevent heat
losses and possible freezing up, especially where the
lines run under rooves and ventilated cellar rooms. The
drain connections must be easily-accessible, so that the
entire system including the boiler and hot water system
can be drained. The drain connections should be at least
1/2 " (BSP nominal size) and must be in accordance with
BS 2879.
The boiler is suitable for Minibore and Microbore
systems. Water lines are to be copper pipes in
accordance with BS 2871, Part 1. All capillary
connections in all the hot water lines must be carried
out with lead-free solder. These must be thoabout
cleaned, especially when connecting a new boiler to an
existing system.
a Caution!
To prevent deposition and severe damage to
the boiler and heating system the cleaning
agent must be applied carefully and subse-
quently removed from the heating system by
draining it completely. Cleaning agents should
not remain in the heating system longer than
24 hours.
This cleaning process must take place before a new
boiler is fitted in accordance with BS 7593.
Recommendations on the use of system cleaning agents
can be obtained from Sentinel, Betz Dearborn Ltd.
Widnes, Cheshire, WA8 8UD, Tel. 0151 420 9595, or
Fernox, Cookson Electronics, Forsyth Road, Sheerwater,
Woking, Surrey GU21 5RZ, Tel. 01483 793200.
Installation and maintenance instructions ecoTEC 0020029173_01
6.2

Filling the system

6.2.1

Preparation of heating water

a Caution!
Do not add anti-freeze to the system water!
Addition of such can attack the boiler seals and
ultimately result in damage to the boiler and
cause noise during the heating operation.
Vaillant assumes no liability for this and such
consequential damages. Please ensure the
operator is aware of frost protection methods.

6.2.2 Filling and bleeding from the heating side

2
Fig. 6.1 Check the filling pressure of the heating system
a Caution!
Fill the system in accordance with standards,
and only via the combined filling and emptying
valve on the boiler's return connection.
Otherwise, problems with bleeding the boiler
may occur!
h Note!
The ecoTEC is equipped with a pressure gauge
(1) and a digital pressure indicator. You can
display the precise filling pressure when the
boiler is switched on by pushing the "-" button
(2). You can also switch between the
continuous display of temperature or pressure
by keeping the "-" button pushed for about
5 seconds.
For the heating installation to work properly the
indicator on the pressure gauge (1) must be in the upper
half of the dark grey area when the system is cold (see
Fig. 6.1). This corresponds to a filling pressure between
1.0 and 2.0 bar.

Start-up 6

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