Conversion Instructions

Gas Conversion Kit
Bosch Thermotechnik GmbH
Junkersstrasse 20-24; D-73249 Wernau/Germany
6 720 646 558 (2010/11)
B Insert the flue gas probe approx. 2 3/4 inches (70 mm) into the test
port and seal around it.
B Press and hold the emissions test button until it lights up.
The display shows the supply temperature alternating with =
maximum set output in heating mode.
B Briefly press the emissions test button .
The display shows the supply temperature in alternation with =
maximum nominal output.
B Measure the CO
2
or O
2
level and the CO content of the flue gas
(Æ “Installation and Service Instructions for Contractors”).
B On the the gas throttle break the seal at the slot and remove the cap.
Fig. 4 Remove seal from the gas throttle
B Adjust the gas flow throttle to set the CO
2
or O
2
level for maximum
nominal output according to the following table:
Fig. 5 Set maximum nominal output
B Briefly press the emissions test button .
B The display shows the supply temperature in alternation with =
minimum nominal output.
B Measure the CO
2
or O
2
level.
B Remove the sealed screw (Æ Fig. 6, [3]) from gas valve adjustment
screw (Æ Fig. 6, [2]) and set CO
2
or O
2
level for minimum nominal
output.
Fig. 6 Set minimum nominal output
B Re-check settings at maximum and minimum nominal output and re-
adjust if necessary.
B Repeatedly press the emissions test button until the light goes
out.
The display returns to the supply temperature.
B Record the CO
2
or O
2
levels and the CO content of the flue gas in
the commissioning log.
B Reinstall the screw (Æ Fig. 6, [3]) to cover the gas valve adjustment
screw.
B Remove flue gas probe and close the flue gas test port properly.
Fig. 7 Close flue gas test ports
Check gas supply dynamic pressure
B Switch the appliance OFF and close the gas shut-off valve.
B Loosen the screw in the test port for gas inlet pressure
(Æ Fig. 6, [1]) and connect a pressure gauge (Æ Fig. 8).
Fig. 8 Check inlet gas pressure
B Turn on the gas cock and switch the appliance ON.
B Press and hold the emissions test button until it lights up.
The display shows the supply temperature alternating with =
maximum set output in heating mode.
B Briefly press the emissions test button .
The display shows the supply temperature in alternation with =
maximum nominal output.
B Check the required gas inlet pressure according to the following
table:
B Repeatedly press the emissions test button until the light goes
out.
The display returns to the supply temperature.
B Switch the appliance OFF, turn off the gas cock, remove the
pressure gauge and tighten the screw in the test port for gas inlet
pressure.
B Reinstall the cover.
Maximum nominal
output
Minimum nominal
output
Gas type CO
2
O
2
CO
2
O
2
NG 9.4 % 4.0 % 8.6 % 5.5 %
LPG (propane) 11.0 % 4.2 % 10.4% 5.1 %
1 .
2 .
6 7 2 0 6 1 2 6 5 9 - 3 7 . 1 R
6 7 2 0 6 1 2 6 5 9 - 3 8 . 1 R
6 720 641 933-81.1O
1
3
2
Gas type
Nominal pressure
" W.C. (mbar)
Permissible pressure range
for maximum nominal output
" W.C. (mbar)
NG 7 (17.4) 3.5-10.5 (8.7-26.1)
LPG (propane) 11 (27.4) 8-13 (19.9-32.3)
Do not operate the appliance if the measured value is
below or above these values. Determine the cause and
eliminate the fault. If this is not possible, block the
appliance on the gas side and notify the gas supplier.
6 720 641 933-80.1O
6 720 614 090-34.1O