43
Output adjustment procedure at the boiler designated for natural gas combustion and
equipped with SINGLE STAGE GAS VALVE:
1. Put the boiler into operation.
2. Measure the gas inlet pressure.
3. Connect the manometer (U-tube) to the gas outlet overpressure measuring point on the compact
electromagnetic valve.
4. By using the internal regulation screw adjust the necessary gas overpressure on valve gas pressure
regulator. By turning clockwise the gas overpressure is growing and vice-versa is dropping. The output
can be set according to the customer ´s requirement to the value stated in table no. 3a (every size can
be set within the range between the reduced and rated output).
5. If the adjusted values do not comply with required values repeat the whole procedure.
Fig. no. 26
Honeywell VK 4100 A 1002 gas valve
Smooth start regulation (starting regime setting)
Honeywell VK 4100Q 2003 valve is by its manufacturer set to the slowest start (see fig. no. 27 – MIN curve).
In case of need to change the opening characteristics the adjustment can be done to the next points and fig.
no. 27.
1. Remove the black cap (see. fig.25a – smooth start regulation), which has a bayonet thread.
2. Under the cap there is the red push button in shape off an arrow.
3. If the arrow is turned against the gas flow direction the start is the slowest (see. fig. no. 27 - curve MIN)
4. If the arrow is turned in the gas flow direction the start is the fastest (see. fig.27 - curve MAX)
Fig.no. 27
Main valve opening characteristics
Time (sec)
O
u
tl
e
t
g
a
s
o
v
e
rp
re
s
s
u
re
(
m
b
a
r)
Inlet gas
overpressure
measuring
Gas inlet into the
valve
Regulation screw cover
(internal regulation screw is
accessible after having
unscrewed it)
Gas pressure regulator
Outlet gas overpressure
measuring (pressure on the
burner nozzles)
Gas outlet for ignition pilot
burner
Gas outlet into the burner
Summary of Contents for GARDE G 42 ECO
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