Measure Static Pressure And Running Pressure - Viessmann VITODENS 200-W Service Instructions Manual

Vitodens 200-W B2HA 19, 28, 35 Service

Measure Static Pressure and Running Pressure

IMPORTANT
A CO measurement (see page 25) must be taken before
and after working on gas appliances to eliminate risks to
health and to guarantee the satisfactory condition of the
system.
IMPORTANT
The burner is automatically ignited and starts operation
after a safety time has elapsed. During initial start-up,
the unit may indicate a fault because of air in the gas
supply pipe (especially for liquid propane gas). After
approximately 5 seconds, press the "R" button to reset
the burner. The ignition procedure is repeated. This boiler
employs a direct spark ignition system.
WARNING
Ensure that there is no open flame in the room.
1. To measure static and/or running pressure remove
boiler enclosure panel as indicated page 12 in these
instructions.
2. Close gas shutoff valve (field supplied).
3. Loosen screw at inlet gas pressure port A on the
gas combination valve, do not remove completely.
Connect manometer.
4. Open the gas shutoff valve.
5. Measure static pressure. Values must be:
14 "w.c. maximum for NG
14 "w.c. maximum for LPG
6. Enter measured value into Maintenance Record on
page 97 in this manual.
7. Start up boiler, using the ON/OFF switch "8" on
the boiler control.
Note: Slide the black control cover outwards to
access the ON/OFF switch.
8. Measure the running pressure; value must be:
Note: Use suitable measuring instruments calibrated
with a minimum resolution of 0.04 "w.c. for
measuring the running pressure.
Running supply pressure with
NG LPG
under 4 "w.c. under 10 "w.c.
4 to 14 "w.c. 10 to 14 "w.c.
over 14 "w.c. over 14 "w.c.
9. Enter gas type into Maintenance Record on page 96
in this manual.
10. Switch off the ON/OFF switch "8" on the boiler
control, close the gas shut-off valve, remove the
manometer and re-tighten the screw at inlet gas
pressure port A.
WARNING
Never purge a gas line into a combustion chamber.
Never use matches, candles, flame, or other sources of
ignition for purpose of checking leakage. Use a soap and
water solution to check for leakage. A failure to follow
this warning could result in fire, explosion, personal injury
or death.
Start-up and Service
Corrective action
Do not start the boiler.
Notify your gas supply
utility or LPG supplier.
Start up boiler.
Do not attempt
adjustment. Call local
gas utility to decrease
pressure or install up
stream gas pressure
regulator. Boiler valve
must not be exposed to
pressure over 14 "w.c.
17