6720818454 (2016/02) US
SSB
22 | Installation
4 .6
Gas supply piping
Verify that the type and the pressure of the gas supplied correspond with
those required for the boiler. When field converting the boiler from Natural
to LP gas be sure to adhere the new gas label on the boiler.
The minimum and maximum pressure for natural gas are 3.5” W.C. (8.72
mbar) and 10.5” W.C. (26.15 mbar) respectively.
The minimum and maximum pressure for LP gas are 8” W.C. (19.9 mbar)
and 13” W.C. (32.3 mbar) respectively.
4 .6 .1
Connection of gas supply piping
Connect the gas supply to the unit as follows:
► Install a ground joint union for servicing as required.
► Install a manual shutoff valve in the gas supply piping
►
Install a sediment trap/ drip leg
► Purge all air from the gas supply piping.
► Before placing the appliance in operation, check the appliance and its
gas connection.
► Check the appliance and its gas connection with a leak test before
placing in operation.
a
a
WARNING:
Gas piping must be supported with proper
hangers and not from the boiler itself or its devices and
accessories.
a
a
DANGER: Never use an open flame to test for gas leaks.
Always use an approved leak detection method.
a
a
WARNING:
Failure to properly apply pipe sealing
compound can result in severe personal injury, death, or
substantial property damage.
The Commonwealth of Massachusettes prohibits the use of copper tubing
for the gas line.
4 .6 .2
Gas type conversion
a
a
DANGER: 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 all applicable codes 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 is carried out by an
unqualified person, a fire, explosion 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
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 resp onsible 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
2
or O
2
reading taken at maximum nominal output and minimum nominal
output using an electronic flue gas analyzer.
LP conversion kit installation (SSB255)
Natural Gas to LP 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.
NOTICE: This change may only be performed by a qualified
installer or service technician, according to the following
procedure.
Switching from NATURAL GAS to LP
► Close the gas cock
► Disconnect the electric power supply from the boiler
a
a
WARNING: to avoid electrical shock, it is mandatory to
disconnect the boiler from the power supply using a service
disconnect external switch.
► Remove the front panel
► Unscrew the 3 screws ‘A’ and the swivel joint ‘B’ indicated in Fig. 22 to
separate the valve from the fan
► Separating the two components, you can see the hole where the gas
passes with its gasket
► Insert the provided metal orifice ‘C’ into the gasket “D” without
removing the gasket itself
► Check the condition of the gasket ‘E’. Replace if necessary
► Tighten the swivel joint ‘B’
► Tighten the 3 screws ‘A’
► Switch the main power supply to ON
Fig. 22
NOTICE: Make sure there is no demand or call for heat.
► Use the control panel to enter in the parameter list and change the
parameter N° 98 (Gas Type) from “NG” to “LPG”
► Reopen the gas shut-off cock
► Adjust the CO
2
parameter as explained in chapter “5.7 Adjusting
and setting CO2 limits” (see “Tab. 17 Number of turns for gas valve
settings”)
► Affix the gas type label from the gas conversion kit to the appliance
(Fig. 24).
A
B
C
E
D
Содержание Buderus SSB255
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