Vaillant ecoTEC plus SERIES Instructions For Installation And Servicing - page 28
Instructions for installation and servicing ecoTEC plus 0020020828_07
28
5.1.2
Gas pressure statement - Natural gas
a
Natural gas:
Do not proceed with the adjustment or attempt
to put the unit into service if the inlet working
pressure lies outside the range shown in
table 5.1
The nominal operating pressure at the gas meter outlet
should be between 19 and 23 mbar. The gas valve within
the appliance is factory set for Natural Gas G20 and
should need no adjustment. The appliance is designed to
operate with an inlet pressure to the appliance of
20 mbar when the appliance is operating at the maxi-
mum heat input. The inlet working pressure to the appli-
ance is measured at the appliance multi-functional gas
valve on the valves inlet pressure test point, see fig. 5.3.
Due to internal appliance pressure losses the reading at
the inlet of the appliance gas valve may be lower than
the design pressure of 20 mbar.
The acceptable pressure measured at the appliance gas
valve inlet is:
Natural Gas
(G20)
Meter outlet pressure
Minimum pressure
at gas valve inlet
ecoTEC plus
415/418/428
Maximum
Design (nominal)
Minimum
23 mbar
21 mbar
19 mbar
20
mbar
18
mbar
16
mbar
ecoTEC plus
438
Maximum
Design (nominal)
Minimum
23 mbar
21 mbar
19 mbar
19.5
mbar
17.5
mbar
15.0
mbar
Table 5.1 Acceptable pressure measured at the appliance gas
valve inlet
h
Note!
In all instances the gas rate to the appliance
shall be measured.
a
Caution!
Should the pressure recorded at the gas meter
not be between 19 mbar and 23 mbar then the
Emergency Service Provider should be contact-
ed.
a
Caution!
Should the pressure at the gas meter be cor-
rect but lower pressure at the gas valve than
indicated in the above table, it may indicate
blockage in the internal pipework or that the
pipework is undersized. Rectification work must
be undertaken before the appliance is commis-
sioned.
5.1.3 Initial
Lighting
The combustion for this appliance has been checked,
adjusted and preset at the factory for operation on nat-
ural gas (G20) as defined on the appliance data label.
Do not adjust the Gas/Air ratio valve. No measurement
of the combustion is necessary, having checked:
– the appliance has been installed in accordance with
the instructions.
– the integrity of the flue system and flue seals.
– the integrity of the appliance combustion circuit and
relevant seals.
– the gas service isolation valve, diagram 10.1, is open.
The lighting procedure of the boiler is fully automated.
• To prepare the boiler for initial lighting first ensure
that all external controls are calling for heat.
• For access open the front flap by pulling at the centre
of the case strip.
• Turn on the power to the appliance whilst holding the
+ button - keep held until the P0 appears.
• release and press the + button until P1 is displayed on
the screen.
• With ALL other gas appliances operational.
• Press the I button to commence operation at FULL
gas rate to carry out the gas pressure test.
• Ensure that the heat generated can be dissipated into
the heating system.
• Measure the gas pressure at the test point.
• When completed turn off all gas appliances and re-
move the pressure gauge, ensure all gas test points
are safely tightened.
• Repeat procedure - starting the boiler in P1 mode. This
time checking the appliance gas rate at the gas
meter.
• Ensure the test results are in line with tables 5.1 and
5.2
• Once completed press I and +
The appliance operating status appears on the screen
see Fig 5.4 (2).
2
4
1
3
Fig. 5.4 Switching on the appliance
h
Note!
Allow the boiler to run on minimum until com-
missioning is complete.
5 Commissioning (Part I)