Checking The Static And Supply Pressure - Viessmann Vitodens 200-W Installation Instructions Manual

Gas supply

Checking the static and supply pressure

When installing, commissioning or servicing a gas appliance that incorporates a pre-mix
burner and zero-set governor, because it is not possible to measure an operating pressure
the engineer should first check that the gas supply is metered and ascertain whether it is
possible to measure the gas rate. If the gas input rate can be measured then the
requirements of GSIUR 26(9) can be met, including any specific requirements in manufactur-
er's instructions.
If gas input rate cannot be measured then, to satisfy the intent of GSIUR 26(9), the engineer
shall measure the combustion quality of the appliance in accordance with BS 7967 or the
manufacturer's instructions.
If the engineer does not have the required equipment and no alternative test is specified by
the manufacturer then the appliance shall be turned off and disconnected as an un-commis-
sioned appliance until such time that equipment is available to undertake such tests.
Danger
CO build-up as a result of an incorrect combustion can have serious health
implications.
Carry out a CO test prior to and after work on gas equipment.
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Operation with Nat Gas or LPG
1. Close the gas shut-off valve.
2. Undo the screw inside connector "IN"
on the gas train, but do not remove,
then connect the pressure gauge.
3. Open the gas shut-off valve.
4. Measure the static pressure and record
it in the service report.
5. Start the boiler.
Note
During commissioning, the boiler can
enter a fault state because of airlocks in
the gas pipe. After approx. 5 s, press
(RESET) to restart the boiler.
A