Viessmann MatriX Service Instructions For Contractors page 10

Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
Supply pressure
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Fig. 6
Supply pressure
(flow pressure)
Below 15 mbar (1.5 kPa)
15 to 18 mbar (1.5 to 1.8
kPa)
18 to 50 mbar (1.8 to 5
kPa)
Above 50 mbar (5 kPa)
10
Steps to take
Make no adjustments and notify the gas supply utility.
Please note! The boiler may only be operated temporarily with this setting (emergen-
cy mode).
Notify your gas supply utility.
Start the boiler.
Install a separate gas pressure governor with zero off upstream of the boiler system,
and regulate the pressure to 20 mbar.
Notify your gas supply utility.
(cont.)
1. Start the burner.
Note
For commissioning, see page 7. Switch the burner
to maximum heating output. For this, activate the
emissions test switch at the control unit.
2. Check the supply pressure (flow pressure); see
table on page 10.
Note
The supply pressure (flow pressure) should be
between 18 and 50 mbar (1.8 and 5 kPa). The gas
pressure switch is factory set to 10 mbar (1 kPa).
Never alter this setting.
3. Record the actual value in the report (on
page 39).
4. Close the gas shut-off valve.
5. Remove the pressure tester and close test connec-
tor .
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