First Flushing Of The System; Filling And Venting From The Hot Water Side; Filling The Condense Trap; Checking The Gas Setting - Vaillant ecoTEC exclusive SERIES Installation And Maintenance Instructions Manual

6 Start-up
• Repeat this at all radiators until the complete system
is full, all air locks have been cleared and the boiler
pressure gauge reads 1.5 bar. Release any air from
the pump by slackening the centre screw. Turn off
the filling valve (2) and fully close filling valve (1).
• The boiler is equipped with an automatic air release
valve. To allow this to vent the boiler, the cap on the
top must be slackened by 1 –2 turns (This cap must be
left slackened during boiler operation to ensure any
residual air or system gases are released).
• Check the heating system and boiler connections
are sound.
Note!
h
Use the test programme P.0 to vent the boiler
and the heating system: The unit does not start
in heating mode, the heating pump switches on
and off and alternately vents the heating cir-
cuit and the hot water circuit, see Chapter 9.2.
6.1.2

First flushing of the system

Note!
h
The entire heating system must be flushed
through completely at least twice: once cold
and once hot, in accordance with the following
instructions.
• Check if all radiator thermostat valves and both
maintenance cocks on the boiler are open.
• Connect a hose to the drain valve which is located
at the lowest position in the heating system.
• Open the 1/2" KFE drain cocks and all the vent valves
on the radiators so that the water flows quickly and
completely out of the heating system and the boiler,
in order to remove the contamination caused during
the installation out of the heating system before the
boiler is started up.
• Close the 1/2" KFE drain cocks.
• Re-fill the heating system with water as described
in Section 6.1.1.
• Check that the over-pressure valve in the heating
system is functioning correctly by turning the handle
on the valve.
• Check the pressure in the heating system and top
up with water if necessary.
• Close filling valve 1 and filling valve 2.
6.1.3

Filling and venting from the hot water side

• Open the cold water stop cock on the appliance on
the inlet combination.
• Fill the hot water system by opening all the hot water
taps until water comes out.
• As soon as water comes out of all the hot water taps,
the hot water circuit is filled completely and also vented.
22
6.1.4

Filling the condense trap

1
Fig. 6.4 Filling the condense trap
d Danger!
If the appliance is started up with an unfilled
condense trap, there is a danger of poisoning
by exhaust gas emission.
Fill the trap as follows:
• Unscrew the lower section of the trap (1) from the
condense trap.
• Fill the lower section of the trap (1) 3/4 full with water.
• Screw the lower section of the trap back onto the
condense trap.
6.2

Checking the gas setting

a Caution!
Conversion from natural gas to liquid gas or
vice versa may only be undertaken by Vaillant
service personnel or a suitably qualified
(CORGI registered) installer.
Note!
h
For all kind of conversions a special Vaillant
conversion kit is needed. Further information
can be obtained from Vaillant Service Solutions
(0870 6060 777).
6.2.1 Checking the connection pressure
(gas inlet working pressure)
Proceed as follows to check the connection pressure:
• Remove the front cover from the device.
• Close the gas isolation cock on the unit.
ecoTEC exclusive installation and maintenance instructions / 0020017768_02