Converting The Appliance To Different Gas Types; Setting The Gas/Air Ratio - Benchmark RD 532i Installation And Servicing Instructions

8

Converting the appliance to different gas types

The setting is factory sealed at maximum. Adjustment to
the rated heat input and min. heat input is not neces-
sary.
Checking the gas supply pressure
B Check the gas supply pressure at the gas supply
pressure testing point.
Natural gas appliances must not be oper-
i
ated if the gas supply pressure is below
18 mbar or above 24 mbar.
LPG appliances must not be operated if
the supply pressure is below or above
37 mbar.
Natural gas
• Appliances for natural gas type G20 are factory set
to Wobbe-Index 15 kWh/m
pressure and sealed.
6 720 611 447 GB (03.11)
3
and 20 mbar supply
Converting the appliance to different gas types
8.1

Setting the gas/air ratio

The gas/air ratio may only be adjusted on the
basis of a CO measurement at max. heat output
2
and min. heat output using an electronic tester.
B Switch off the appliance at the master switch (O).
B Remove the outer case (see page 14, refer to
fig. 13).
B Switch on the appliance at the master switch (I).
B Unscrew sealing plug from flue gas testing
point (234). Refer to fig. 42.
B Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
234
Fig. 42
B On the text display unit, select in the main menu Set-
tings, Service, Display service parameters.
B Press and hold the
onds) until the display shows Adjust service
parameters and the first service function to be set,
2.0 Operating mode. If a fault has occurred, the
display will show 0.0 and the last fault.
B Press
or
Operating mode normal.
B Press the
button.
B Press
or
B Measure the CO level.
2
B Prise off the seal on the gas flow restrictor.
B Adjust the gas flow restrictor (63) to obtain the CO
level given in Table 15. Refer to fig. 43
6 720 610 599 - 01.TD
button (for about 5 sec-
until the display shows 2.0
to select Max.
2
33