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INSTALLATION
supply piping.
− Installation of a union fitting at the appliance gas line
connection is required for ease of service.
4.12.1 Gas Supply Specifications
The gas supply input specifications to the unit for Natural Gas are
as follows:
− The maximum pressure to the unit must not exceed 13.5"
w.c.
− The gas supply piping and pressure to the unit must be
of sufficient capacity to provide 808 cfh for AR 800, while
maintaining the recommended minimum gas pressure at
8" w.c. for burners operating at maximum capacity.
4.12.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line
upstream of the boiler. Maximum allowable gas pressure to the
boiler is 13.5"w.c.
4.12.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet
piping under most conditions. The use of a lever-acting positive
lock-up type regulator with over-pressure protection (i.e., internal
relief) is recommended. Regulators must conform to the following
specifications:
− The external natural gas regulator must be capable of
regulating
a)
40,000 - 800,000 BTU/HR for AR 800
of natural gas while maintaining a minimum gas pressure
of 4" w.c. natural gas, or 8.0" w.c. propane to the unit.
− The desired pressure setpoint should be 8.0" w.c for natural
gas, and 12.0" w.c. for propane.
− A regulator MUST be used when gas supply pressure will
exceed 13.5" 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pressure regulator, unless superseded by state and local codes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
recommended unless stated otherwise by the regulator
manufacturer. Consult the manufacturer for additional
recommendations and installation options.
− For all Array boilers, when installed horizontally the
required distance between the gas pressure regulator and
the boiler is ten feet. A minimum of ten pipe diameters of
straight pipe must be maintained between the regulator
and any pipe fitting, elbow, reducer, valve, etc.
− When pipe size reduction is required, use only bell reducers.
MASSACHUSETTS INSTALLATIONS ONLY
For Massachusetts installations, a mandatory external gas supply
regulator MUST be installed. The gas supply regulator must be
properly vented to outdoors. Consult the local gas utility for detailed
requirements concerning venting of the supply gas regulator.
The Commonwealth of Massachusettes prohibits the use of copper
tubing for the gas line.
NOTE: It is the responsibility of the customer to source, purchase,
and install the appropriate gas regulator as described above.
4.12.4 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 property
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
maintenance
unqualified person, a fire, explosion or generation of
excessive levels of carbon monoxide may result causing
property
damage,
Before carrying out electrical work, disconnect the appliance
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
nominal output using an electronic flue gas analyzer. The desired
high-fire excess O2 level is 5.1% for natural gas.
Natural Gas to Propane Conversion Kit for AR 800: Part #20178770
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
disconnect the boiler from the power supply using an external
circuit breaker or disconnect switch.
− Open the front panels
− Change the mixer with new version present in the
Conversion Kit for AR 800: Part #20178770
− Unscrew the nuts (1) that connect the fan to the upper
flange of the heat exchanger
Fig. 14 NG mixer removal
− remove the tube (2), that connects the mixer and the gas
valve
20
and
all
applicable
is
carried
out
personal
injury
or
loss
codes
by
an
of
life.
or O
2
2
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