Bedienungsanleitung Buderus SSB399 (Seite 22 von 68) (Englisch)

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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 eld 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.



WARNING: Gas piping must be supported with proper

hangers and not from the boiler itself or its devices and

accessories.



DANGER: Never use an open ame to test for gas leaks.

Always use an approved leak detection method.



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



DANGER: Personal injury and property damage.

► This conversion shall only be performed by a trained and

certied 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, modication,

operation or maintenance is carried out by an

unqualied person, a re, 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 specied in these

instructions.

The gas-air ratio must always be set on the basis of a CO

or O

reading taken at maximum nominal output and minimum nominal

output using an electronic ue 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 qualied

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



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 orice ‘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

parameter as explained in chapter “5.7 Adjusting

and setting CO2 limits” (see “Tab. 17 Number of turns for gas valve

settings”)

► Afx the gas type label from the gas conversion kit to the appliance

(Fig. 24).

A BC ED

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