Technical data

37
Commissioning Part I 5
Instructions for installation and servicing ecoMAX 37
5.10 Checking the gas supply settings
5.10.1 Factory–adjusted gas 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 5.10.2 and 5.10.3.
5.10.2 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.
• Loosen the sealing screw marked ”in” (1) on the gas
valve assembly (Fig. 5.4).
• Connect a digital or a U gauge (2).
• Open the gas shutoff valve fitted to the boiler.
• Put the boiler into service (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.
Natural gas:
DO NOT proceed with adjustment or attempt
to put the unit into service if the inlet working
pressure lies outside the 17–25 mbar range.
LPG:
DO NOT proceed with adjustment or attempt
to put the unit into service if the inlet working
pressure is lower than 37 mbar.
• Turn off the appliance, remove U gauge.
• Tighten the test point screw and test for soundness.
• Record appliance working gas inlet pressure (mbar) in
the Benchmark Installation, Commissioning and
Service Log Book
5.10.3 Check gas rate
The boiler is fitted with a fully modulating automatic gas
valve which ensures that the precise air/gas ratio is pro-
vided under all operating conditions.
The gas rate has been set during production and does
not require adjustment.
The gas rate of the boiler should be checked with the
front case fitted as follows:
• Activate full gas rate mode by simultaneously pressing
the ”+” and ”–” buttons on the display system
(ecoMAX 800, fully open the hot water tap to maxi-
mum water flow rate).
• Wait at least 5 minutes, or until the boiler has reached
its operating temperature
• With all other gas appliances turned off measure the
gas rate at the gas meter. Check that the gas rate is as
stated in Table 5.1.
Fig. 5.4 Measuring the inlet working pressure
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83 41 77_12 GB04.04.qxd 22.09.2004 12:34 Uhr Seite 37