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33Instructions for installation and servicing ecoTEC
5.7 Adjusting the pumping capacity
Only in ecoTEC plus boilers:
The capacity of the two-stage pump can be adjusted to
the requirements of the heating system. If needed,
change the setting of the operating mode dependent
pump speed under the diagnostic number “d.19” (see
section 8.1.2).
5.8 Adjusting the by-pass
The appliances have an adjustable by-pass valve.
The pressure can be adjusted between 170 and 350 mbar.
Approx. 250 mbar is preset (mid-position). The pressure
changes by approx. 10 mbar each time the adjusting
screw is rotated. By turning right, the pressure increases
and turning left decreases it.
1
Fig. 5.11 Adjusting the by-pass valve (in combination boilers)
1
Fig. 5.12 Adjusting the by-pass valve (in system boilers)
• Regulating the by-pass on the adjusting screw (1).
5.9 Checking the gas supply
5.9.1 Factory settings
Caution!
Before operating the boiler check the data
badge and ensure that the correct gas type
appliance has been installed.
The boiler is supplied ready adjusted and no further gas
adjustments are necessary, however both the gas inlet
working pressures and maximum gas rates should be
checked as detailed in 5.9.2 and 5.9.3.
5.9.2 Gas inlet working pressure
Check the inlet pressure as described below:
• Remove the front case from the boiler.
• Close the gas shutoff valve fitted to the boiler.
1
2
Fig. 5.13 Checking the gas supply pressure
• Loosen the sealing screw marked “in” (1) on the gas
valve assembly.
• Connect a digital or a U gauge (2).
• Open the gas shutoff valve fitted to the boiler.
• Put the boiler into operation (refer to the Instructions
for Use supplied with the boiler).
• Check the U gauge reading and ensure the inlet gas
pressure is between the pressures detailed below.
Commissioning Part I 5
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