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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Start-up, Inspection and Maintenance
Clock Natural Gas Meter
A boiler under fired by 5% is still acceptable.
Do not over fire the boiler.
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 125 boiler (125 000 Btu/h input)
requires 288 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)/288) x 1000
{
125 000 Btu/h input.
Therefore, the boiler input is correct.
Burner input formulas (up to 4500 ft.):
INPUT=(3600
+
t) x 1000 where
t=TIME (sec.) for 1 ft.
3
INPUT=(3600 x .01 x 1000 x 35.31)
+
T where
T = TIME (sec.) for .01 m
3
natural gas
CAUTION
Always contact your gas utility to obtain the correct
heating value before clocking the meter.
IMPORTANT
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.
A CO
2
measurement (see page 48) must be taken before
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 91 in this
manual.
IMPORTANT
Check all Primary and Secondary Circuit Connections for Leaks
Perform Combustion Analysis
