Viessmann WB1A Series Installation And Service Instructions Manual page 47

Steps
(continued)
S
Start-up and Maintenance
ervice
The Vitodens 100-W boiler is for use
with gases whose characteristics fall
within the following ranges. Do not use
any other types of gas.
Heating value (gross)
Specific gravity
Ultimate carbon dioxide (CO
S
Start-up and Maintenance
ervice
Legend
Inlet gas pressure measurement
port
Outlet pressure port (connected to
differential pressure switch)
Do not remove this screw or
attempt to make any adjustment
to the gas valve
All manuals and user guides at all-guides.com
3. Select appropriate gas type
1. Ensure that the fuel type listed on
the boiler rating plate is the correct
type for the installation being
attempted.
2. Record fuel type in Maintenance
Record on page 74.
3
Btu/ft
) %
2
4. Measure static pressure and running pressure
Static pressure
1. To measure static and/or running
pressure remove burner cover panel
as per the removal and reinstallation
instructions on page 18 in these
instructions.
2. Close gas shutoff valve.
3. Loosen screw in test nipple 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:
H 14 "w.c. max. for NG
6. Enter measured value into
Maintenance Record on page 74 in
this manual.
7. Start up boiler, using the on/off
service switch (field supplied).
Initial Start-up, Inspection and Maintenance
Natural gas
970 to 1100
0.57 to 0.70
11.7 to 12.2
IMPORTANT
A CO measurement (see page 50) 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. After approx. 5 seconds,
press the burner reset button (see page
60). The ignition procedure is repeated.
This boiler employs a direct spark
ignition system with 3 trials for
ignition.
47