Select Appropriate Gas Type; Measure Static Pressure And Running Pressure - Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual

Steps
Start-up and Maintenance
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 (CO2)
Start-up and Maintenance
Fig. 47
Legend
A Inlet gas pressure measurement
port
B Outlet pressure port
C Low-fire adjustment screw / cover
D Hi-fire adjustment screw

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 83.
Natural gas
3
Btu/ft 970 to 1100
0.57 to 0.70
% 11.7 to 12.2

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
instructions on page 55.
2. Close gas shutoff valve.
3. Loosen screw in test nipple A
on the gas combination valve,
do not remove completely.
Connect calibrated manometer.
4. Open the gas shutoff valve.
5. Measure static pressure. Values
must be:
14 "w.c. max. for NG
g
14 "w.c. max. for LPG
g
6. Enter measured value into
Maintenance Record on page 83
in this manual.
7. Start up boiler, using the on/off
service switch (field supplied).
Initial Start-up, Inspection and Maintenance
Liquid Propane gas
2466 to 2542
1.522 to 1.574
13.73 to 13.82
IMPORTANT
A CO
must be taken before and after
working on gas appliances to eliminate
health risks 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 F4 because of air in
the gas supply pipe. After fault F4
is displayed, reset the burner (see
page 66). The ignition procedure is
repeated. This boiler employs a direct
spark ignition system with 3 trials for
ignition.
measurement (see page 50)
2
47