Clock Natural Gas Meter; Check All Primary And Secondary Circuit Connections For Leaks; Perform Combustion Analysis - Viessmann Vitodens 100-W WB1B Series Installation And Service Instructions Manual

Start-up, Inspection and Maintenance
Steps
(continued)
Start-up and Maintenance
IMPORTANT
A boiler underfired by 5% is still acceptable.
Do not overfire the boiler.
CAUTION
Always contact your gas utility to obtain the correct
heating value before clocking the meter.
Start-up and Maintenance
Start-up and Maintenance
66

9. Clock natural gas meter

Clock natural gas meter to verify input
1. Ensure all other gas equipment served by the meter is
turned off during timing of gas input to the Vitodens
100-W boiler.
2. Measure the time in seconds it takes for the boiler
to use 10 cu. ft. of gas. Divide 3600 x 10 by the
number of seconds and you get the number of cu. ft.
of gas used per hour. Multiply this number by the
heating value of the gas to obtain Btu per hour input.
For example:
A Vitodens 100-W boiler (118 000 Btu/h input)
requires 305 seconds to use 10 cu. ft. of natural gas.
After contacting the local utility, you find the heating
value is e.g.
1000 Btu per cu. ft.
Therefore,
((3600 x 10)/305) x 1000
Therefore, the boiler input is correct.
Burner input formulas (up to 4500 ft.):
INPUT=(3600
t=TIME (sec.) for 1 ft.
INPUT=(3600 x .01 x 1000 x 35.31) T where
T = TIME (sec.) for .01 m

10. Check all primary and secondary circuit connections for leaks

Check heating system and domestic hot water
connections (if applicable). Ensure all connections are
pressure tight.
Correct any leaks found on fittings, pumps, valves, etc.

11. Perform combustion analysis

IMPORTANT
A CO
and after working on gas appliances to eliminate health
risks and to guarantee the satisfactory condition of the
system.
Record the measured combustion values in the sequence
stated in the Maintenance Record on page 98 in this
manual.
Vitodens 100-W, WB1B Installation & Service
{
118 000 Btu/h input.
t) x 1000 where
3
3 natural gas
measurement (see page 62) must be taken before
2