Checking The Gas/Air Ratio; Check Co2 Setting At Full Load; Checking The Co2 Setting Under Partial Load - Bosch Condens 7000 F Installation And Maintenance Instructions For The Contractor

Commissioning
The gas static pressure must not exceed 50 mbar with natural gas and
70 mbar with LPG.
If exceeded:
▶ Inform the gas supplier that the gas pressure governor needs to be
replaced.
▶ Do not perform commissioning in accordance with the
manufacturer's instructions.
▶ If the system is currently in operation, take the floor standing boiler
out of operation.
▶ Remove the test hose.
▶ Carefully tighten the locking screw on the test nipple for gas supply
pressure.
Country Gas group
(reference gas)
AT, BG, BY, CH, Natural gas H (G20)
CZ, DK, EE, ES,
GB, GR, HR, IE,
IT, LT, LV, MK,
NO, PT, RO, RS,
RU, SI, SK, TR,
UA
HU Natural gas H (G20)
3)
DE , LU, NL, PL Natural gas E (G20)
FR, BE Sub-group Es
natural gas E (G20)
FR, BE Sub-group Ei natural
gas E (G25)
4)
NL Natural gas K
(G25.3)
3)
DE Natural gas LL (G25)
PL Natural gas Lw
(G27)
HU Natural gas S
(G25.1)
DE, AT, CH, LU, LPG 3P (G31)
NL, SK
BE, BG, CZ, DK, LPG 3P (G31)
EE, ES, FR, GB,
GR, IE, IT, LT,
LV, PL, SI, PT
RO, HU, HR LPG 3P (G31)
1) The gas supplier must ensure that the pressure conforms to country-specific
or local regulations. The conditions mentioned above must also be observed.
If the gas supply pressure is outside the specified range, commissioning is
prohibited.
2) Supply pressure for LPG: the specified pressures refer to the supply pressures
upstream of the additional pressure regulator.
3) Natural gas group "H in accordance with DVGW Code of Practice G 260" falls
within natural gas group "E in accordance with DIN EN 437" Natural gas group
"L in accordance with DVGW Code of Practice G 260" falls within natural gas
group "LL in accordance with DIN EN 437".
4) Natural gas group K in accordance with "NTA 8837-2012" is within the 2nd
gas family according to DIN EN 437.
Table 10 Gas groups and supply pressures according to EN 437
28
1)2)
Supply pressure [mbar]
Min. Rated Max.
17 20 25
18 25 33
17 20 25
17 20 25
20 25 30
20 25 30
18 20 25
16 20 23
18 25 33
42.5 50 57.5
25 37 45
25 30 35
The specified supply pressure must be ensured across the boiler's entire
modulation range. If necessary, an additional pressure regulator must be
provided. In the case of multi-boiler or multi-consumer systems, the
supply pressure range for single boilers must be ensured in each
operating condition of the multi-boiler or multi-consumer system. If
necessary, supply each boiler or consumer via a separate pressure
regulator.
For higher supply pressures than shown in tab. 10 Bosch offers
additional gas pressure governors as accessories.
7.11

Checking the gas/air ratio

▶ Check the CO setting for full and partial burner loads.
2
The following applies for Denmark:
The burner setting in Denmark is made via the O
( Chapter 17.5, page 62).
7.11.1 Check CO setting at full load
2
▶ Read off the load at the control unit (technical documentation of
the control unit).
▶ Wait until at least 70 % of the load has been reached.
▶ Insert the test sensor through the measurement port
( Fig. 30, page 29) in the flue gas collector into the core stream
and check the CO value.
2
▶ If the CO values in the natural gas are less than 8.2 % or above
2
10.5 %, or the CO values are higher than 100 ppm (lf)
Get in touch with Service.
NOTICE:
▶ When operating with LPG, observe the setting instructions enclosed
with the "LPG" conversion set!
▶ Enter the values in the commissioning report
(Chapter 17.6, page 63).
Only for design type C63:
▶ If the supply air infeed is designed as an annular gap around the flue,
check the CO value in the combustion air at the on-site
2
measurement port.
Values above 0 % indicate faults or leaks in the flue gas routing.
▶ Identify and eliminate the fault.
7.11.2 Checking the CO setting under partial load
2
▶ Adjust the flue gas test function via the control unit
(technical documentation of control unit)
▶ Read off load at the control unit or via the Service key.
▶ Wait until the following load has been reached:
– 19 % with boiler size [kW]: 250; 300
– 20 % with boiler size [kW]: 100; 150; 200
– 28 % with boiler rating [kW]: 75
▶ Insert the test sensor through the measurement port
( Fig. 30, page 29) in the flue pipe into the core stream and check
the CO value.
2
▶ If the CO values in the natural gas are less than 8.2 % or above
2
10.5 %, or the CO values are higher than 100 ppm (lf), contact
Service.
1) (lf) = air-free
Condens 7000 F – 6720871560 (2019/11)
content of the flue gas
2
1)