Checking The Connection Pressure (Gas Inlet Working Pressure) - Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

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. 6.5.
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 Meter outlet pressure
(G20)
ecoTEC ex- Maximum
clusive Design (nominal)
832 Minimum
ecoTEC ex- Maximum
clusive Design (nominal)
838 Minimum
Table 6.3 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.
6.2.2 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_04
Minimum pressure
at gas valve inlet
23 mbar 20 mbar
21 mbar 18 mbar
19 mbar 16 mbar
23 mbar 19.5 mbar
21 mbar 17.5 mbar
19 mbar 15.0 mbar
Fig. 6.5 Checking the gas supply pressure
• Release the sealing screw marked "in" (1) on the
gas fitting.
• Connect a digital pressure manometer or u-gauge
manometer (2).
• Open the gas isolation cock on the unit.
• Start the appliance up via P.1 (see Chapter 9.2).
• Measure the connection pressure in comparison
with atmospheric pressure.
a Natural gas:
If the connection pressure is outside the range
19 to 23 mbar, no adjustment should be under-
taken, and the unit must not be started up!
a Liquid gas:
If the connection pressure is outside the range
25 to 45 mbar, no adjustment should be under-
taken, and the unit must not be started up!
If the connection pressure is within the permissible
range, proceed as follows:
• Take the appliance out of operation.
• Close the gas isolation cock on the unit.
• Remove the pressure gauge and screw the sealing
screw (1) back in again.
• Open the gas isolation cock on the unit.
• Make sure that the sealing screw is not leaking.
• Put the front cover back on and turn on the device.
Start-up 6
1
2
25