Commissioning; Confirming The Unit's Gas Type; Gas Type Conversion - Riello Array AR 3000 Installation And Operation Manual

3 COMMISSIONING

3.1 Introduction
Before starting the boiler, the user must be correctly instructed by
the installer, on how to operate the heater, in particular:
− Make sure that the user understands that combustion air
and ventilation openings must not be restricted, closed, or
modified in any way.
− Make sure that the user is informed of all the special mea-
sures to be taken for combustion air inlet and discharg-
ing flue gases, and that these must not be modified in any
way.
− Make sure that the user keeps this manual and all other
documentation included with the boiler.
− Make sure that the user understands never to tamper with
gas control settings and the risk of CO poisoning should an
unauthorized individual do so.
− Make sure that the user knows how to adjust temperatures
and controls.
9
WARNING: Do not attempt to dry fire the unit. Starting the unit
without a full water level can seriously damage the unit and
may result in injury to personnel or property damage. This sit-
uation will void any warranty.
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CAUTION: All of the installation procedures in "Installation"
pag. 6 must be completed before attempting to start the unit.
3.2 Filling the condensate system
The condensate system must be filled with water according to the
Section 2.9.
9
WARNING: At the Start-up and after prolonged shutdown of
the boiler, the condensate traps and the syphon must filled
with water prior to restart it, otherwise combustion gases
will enter the room with a risk of an excessive level of carbon
monoxide.
3.3 Filling the boiler heating system
To fill the heating system, proceed as follows:
− Open any automatic air vents in the heating system.
− Open the fill valve and proceed to fill the heating system
and boiler until the pressure gauge (shown on Fig. 41),
reads the pressure for which the heating system is sized.
The heating system water pressure must be higher than 7.5
PSI.
− Check that there is no water leaking from the fittings. If
there is, the leaks must be repaired.
− Check the pressure gauge during the purging process. If the
pressure has dropped, re-open the fill valve to bring the
pressure back to the desired value.
3.4 Warnings concerning the gas supply
When starting up the unit for the first time the following must be
checked:
− That the unit is supplied with the type of fuel that it is con-
figured to use.
− That the gas supply system is provided with all the safety
devices and controls required under current national and
local codes.
− That the vent and combustion air terminals are properly
connected and free from any blockages.
− That the condensate drain tube is properly connected.

3.4.1 Confirming the Unit's Gas Type

The type of gas and the gas supply pressure that the unit is set up
for is listed on the rating label. The Array Series boilers can operate
using one of the following two gases:
NATURAL GAS
− Maximum supply pressure = 20" W.C. (50.0 mbar).
− Minimum supply pressure = 3.5" W.C. (8.7 mbar).
PROPANE (LP) GAS
− Maximum supply pressure = 20" W.C. (50.0 mbar).
− Minimum supply pressure = 8" W.C. (19.9 mbar).

3.4.2 Gas Type Conversion

If the gas available at the installation site is not the type the boiler
is configured to use, the boiler must be converted. Special con-
version kits are available for this purpose inside the boiler. The
gas conversion procedure may be found in Section "2.11.4 Gas Type
Conversion" pag. 12. Conversion must be carried out by a qualified
technician.
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COMMISSIONING