Servicing
5
Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
55
Subject to modifications resulting from technical improvements !
Buderus • http://buderus-domestic.co.uk
5.3.18 Check wiring connections on gas-valve assembly
z
Check that the plug-in cables are correctly attached to the
gas-valve assembly.
The plug-in cables should be connected as follows:
Blue plug-in lead: fig. 80, item 1 ;
White plug-in lead: fig. 80, item 2.
5.3.19 Checking the gas-burner assembly for correct
activation
z
Set the mains switch to “
0
”.
z
Remove a plug-in cable at the main gas valve and connect
a current-measuring device, at the same point, with a
measuring range of up to 1000 mA AC (fig. 81, item 1).
z
Set the mains switch to “
I
”.
z
Unblock the 800 Series by pressing "reset" button, and
take current reading during start-up procedure.
z
Carry out the same measuring procedure at the
ignition-gas valve (fig. 81, item 2).
z
If the current reading at pos. 1 is approximately 210 mA
and the reading at pos. 2 is about 450 mA, the gas-valve
activation system is in order.
z
Set the mains switch to “
0
”.
z
If the gas-valve assembly activation system is in order,
plug the cable in once more.
fig. 79 Checking the hose connection between the gas-air injector
and gas-valve assembly (SIT gas units)
fig. 80 Checking the wiring connections on the gas-valve assembly
(HONEYWELL assembly illustrated to provide example)
1
2
fig. 81 Checking the gas valve assembly activation system
(HONEYWELL valve assembly shown as example)
1
2
