Checklist For Inspection And Maintenance; Checking The Operating Status Of The Heating Pump; Check Gas Setting; Gas Type Conversion - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Inspection and maintenance
9.4

Checklist for inspection and maintenance

▶ Call up the current fault with service function 1-A2.
▶ Check the flue gas routing visually.
▶ Check the gas supply pressure.
▶ Check the gas/air ratio for minimum and maximum rated heat output.
▶ Check the tightness of the pipework on the gas and water side.
▶ Check and clean the heating block.
▶ Check the electrodes.
▶ Check the burner.
▶ Check the non-return valve in the mixing device.
▶ Clean the condensate trap.
▶ Check the pre-charge pressure of the expansion vessel for the static
head of the heating system.
▶ Check the charge pressure of the heating system.
▶ Check the electrical wiring for damage.
▶ Check the control system settings.
▶ Check the set service functions are in accordance with the
"settings in the service menu" label.
9.5

Checking the operating status of the heating pump

An LED on the pump indicates the operating status.
Possible operating states are:
• LED flashing green = normal operation
• LED solid green = no communication with heating pump,
operation without modulation
• LED solid red = malfunction
If LED is solid green:
▶ Check and ensure correct connection of the signal cable.
If LED is solid red:
▶ Determine and eliminate the cause of the malfunction.
Possible causes of a malfunction are:
• Air in the system,
• low voltage,
• pump is blocked.
36
9.6

Check gas setting

Natural gas (NG)
Devices that are pre-set to natural gas are set to Wobbe index 50 MJ/m
and 11.3 mbar (1.13 kPa) supply pressure and sealed in the factory.
Liquid gas (LPG)
Devices that are pre-set to liquid gas are set to Wobbe index 76.9 MJ/m
and 27.5 mbar (2.75 kPa) supply pressure and sealed in the factory.
1)
LPG type
Commercially available propane
Commercially available butane
General product
Universal LPG (U-LPG)
1) According to NZS 5435
Table 26
• If the device is operated with the same gas type as the one set by the
factory, adjustment to the rated heat input and the minimum heat
input is not required.
• If a device is converted from natural gas to LPG (or vice-versa),
conversion using a gas type conversion set and CO
is required.
▶ Following the gas conversion, affix the gas type label (included in the
scope of delivery of the wall-mounted boiler or gas type conversion
set) to the wall-mounted boiler next to the data plate.
The gas/air ratio must always be set on the basis of a CO
taken at maximum rated output and minimum rated output using an
electronic measuring device.
9.6.1

Gas type conversion

The devices can be converted to liquid gas or natural gas. The part
number of the respective gas type conversion set can be obtained from
the price or spare parts list.
WARNING
Risk of death from explosion!
Escaping gas can cause an explosion.
▶ Only allow a licensed contractor to carry out work on gas-carrying
components.
▶ Close the gas isolator before working on any gas-carrying
components.
▶ Replace used gaskets with new gaskets.
▶ After completing work on gas-carrying components, carry out a leak
test.
▶ Install the gas type conversion set according to the supplied
installation instructions.
Following every conversion:
▶ Set the gas type.
▶ Check and adjust the gas/air ratio.
▶ Affix the gas type label (included in the scope of delivery of the wall
mounted boiler or gas type conversion set) to the wall mounted boiler
next to the data plate.
Condens 8300i W – 6721841533 (2022/12)
Use
Recommended
Permitted
Permitted
Permitted
or O adjustment
2 2
or O reading
2 2
3
3