Function - Buderus 500 - 28/C Servicing Manual

4

Function

4 Function
box 15 Boiler Functions
Turn the mains switch to "ON".
step 1
Turn the operating switch on the DBA control panel of the boiler to position "1" (ON) – see also box 11.
step 2
Is a 3-way valve fitted?
step 3
Is the 3-way valve set to "hot water mode"?
step 4
The Buderus 24V AC external 3-way valve is turned to "heating mode" in 7.5 seconds, while an internal 3-way
step 5
valve is turned to "heating mode" in 2 seconds.
,00{
The display on the DBA control panel of the boiler is checked (maximum of one second).
step 6
[24]
Current CH flow temperature, in °C. See also box 20.
step 7
C [0u]
The boiler begins to warm up. Start of pre purge phase.
step 8
The fan runs for 15 seconds at about 60 % of maximum speed.
Has the pre purge been completed correctly?
step 9
step 10 Deal with fault. The error code, which is now displayed, can be found in box 20. Deal with the fault.
C [0h]
Operating code. See also box 20. The boiler is ready for operation.
step 11
No current heat requirement.
step 12 Start of pump over-run time via the heating system.
The pump over-run time:
– via the heating system, factory-adjusted to 5 minutes;
– via the external reservoir, set to 30-40 seconds;
– via the plate heat exchanger (ECO), set to 30-40 seconds;
– via the plate heat exchanger (warm start), set to 30 seconds;
– after service mode, 1 minute.
step 13 Has the pump over-run time expired?
step 14 Is the boiler set to warm start for hot water and/or is an external storage-type water heater connected?
step 15 Is the plate heat exchanger triggered and/or is the temperature in the external storage-type water heater at least
5 °C below the temperature set at the DBA control panel?
step 16 Is there a current heat requirement from the (room) temperature controller?
step 17 Is the current CH flow temperature lower than 7 °C (frost protection)?
step 18 The pump stops.
step 19 Has the pump been out of use for more than 24 hours?
step 20 Is the plate heat exchanger triggered and/or is the temperature in the external storage-type water heater at least
5 °C below the temperature set at the DBA control panel?
step 21 Is there a current heat requirement from the (room) temperature controller?
We reserve the right to make technical modifications
14
Start phase
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
Checking phase
Operating phase
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Buderus Ltd. • http://www.buderus-domestic.co.uk
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