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INSTALLATION
2.11.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet pip-
ing under most conditions. Regulators must conform to the fol-
lowing specifications:
− The external natural gas regulator must be capable of reg-
ulating
a)
100,000 - 3,000,000 BTU/HR for AR 3000
b)
100,000 - 4,000,000 BTU/HR for AR 4000
of natural gas while maintaining a recommended
minimum gas pressure of 8.0" W.C. to the unit.
− A regulator MUST be used when gas supply pressure will ex-
ceed 20" W.C.
The following are R's recommendations for installation of gas
pressure regulator, unless superseded by state and local codes
and the regulator manufacturer's specifications:
− Horizontal installation of gas pressure regulators is recom-
mended unless stated otherwise by the regulator manu-
facturer. Consult the manufacturer for additional recom-
mendations and installation options.
− For all Array boilers, when installed horizontally the re-
quired distance between the gas pressure regulator and
the nearest pipe fitting, elbow or valve is 10 feet.
− When pipe size reduction is required, use only bell reduc-
ers.
MASSACHUSETTS INSTALLATIONS ONLY
For Massachusetts installations, a mandatory external gas sup-
ply regulator must be installed. The gas supply regulator must be
properly vented to outdoors. Consult the local gas utility for de-
tailed requirements concerning venting of the supply gas regu-
lator.
The Commonwealth of Massachusettes prohibits the use of copper
tubing for the gas line.
NOTE: It is the responsibility of the customer to source and pur-
chase the appropriate gas regulator as described above.
2.11.4 Gas Type Conversion
The heating unit is factory preset for operating with natural gas.
This set-up can be changed using the conversion kits supplied by
the manufacturer, on demand.
9
DANGER: To prevent risks of personal injury and proper-
ty damage, this conversion shall only be performed by
a trained and certified installer in accordance with the
manufacturer's
instructions
and requirements of the authority having jurisdiction.
If the information in these instructions is not followed exactly, or
the installation, adjustment, modification, operation or main-
tenance is carried out by an unqualified person, a fire, explo-
sion or generation of large amounts of carbon monoxide may
result causing property damage, personal injury or loss of life.
Before carrying out electrical work, disconnect the appli-
ance from the power supply at the emergency shutoff switch
or by disengaging the heating system circuit breaker. Take
appropriate measures to prevent accidental reconnection.
The installer is responsible for the proper conversion of this
appliance. The conversion is not complete until the operation
of the converted appliance is checked as specified in these
instructions.
The gas-air ratio must always be set on the basis of a CO
reading taken at maximum nominal output and minimum nomi-
nal output using an electronic flue gas analyzer.
and
all
applicable
codes
or O
2
SWITCHING FROM NATURAL GAS TO LP
− Close the gas shutoff valve
− Disconnect the electric power supply from the boiler
9
WARNING: To avoid electrical shock, it is mandatory to discon-
nect the boiler from the power supply using a service discon-
nect external switch.
− Open the front panels
− Unscrew the swivel joint indicated in Fig. 12 to separate the
valve from the connection pipe with the fan
Swivel joint
LP Orifice
Fig. 12 Natural Gas to LP Gas Conversion
− Separating the two components, the hole where the gas
passes with its gasket can be accessed
− Place the provided metal orifice (Fig. 12) between the two
gaskets (N° on orifice: 9.5)
− Tighten the swivel joint
− Switch the main power supply to ON
− Use the 905PB inner display to enter in the parameter list
and change the parameter #95 (Gas Type) from "NG" to
"LPG"
− Reopen the gas shut-off valve
− Adjust the CO
parameter as explained in next chapter
2
− Affix the gas type label from the gas conversion kit to the
appliance.
2
12
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