Making The Electrical Burner Connection; Checking All Gas Connections For Leaks; Checking The Flue Side Gaskets/Seals - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Vitocrossal 200 CM2 186 to 311 Service
Steps – Commissioning, Inspection and Maintenance

Making the electrical burner connection

Note: Never allow cables/leads to come into contact with
hot components. Secure all cables with cable ties
if required.
Plug burner cable 41 and KM BUS cable 145 into the
1.
burner control unit.
Insert control unit connecting cable 40/156 , boiler
2.
sensor leads 3A/3B , flue gas sensor lead 15A/15B
and power cable 40 , flue gas damper cable 53 on the
burner side into the couplings on the mounting plate.
3. Plug control unit connecting cable 40/156 and KM BUS
cable 145 into the control unit.

Checking the Flue Side Gaskets/Seals

Commissioning, Inspection and Maintenance

Checking all gas connections for leaks

WARNING
Escaping gas leads to a risk of explosion. Always carry
out the following steps.
Note: The use of leak detecting spray can result in
incorrect functions. Leak detecting spray must
not come into contact with electrical components.
1. Insert new gaskets in all gas fittings that have been
opened and then tighten those fittings.
2. Open the gas shut-off valve.
3. Check the inlet seals of the gas valve for tightness.
4. Start the burner.
5. Check the outlet seals of the gas valve and fittings
between the fan and the boiler door and between
the fan and the venturi pipe for tightness.
Flue side gaskets/seals
1. Remove the rear panels from the boiler and disconnect
the venting system from the flue gas collector.
Refer to the Installation Instructions for details.
2. Check that the flue gas collector C is tight to the
boiler A. If required, retighten the flue gas collector
mounting fasteners D.
3. Reconnect the venting system with the flue gas pipe
adaptor and tighten with gear clamps.
Note: The seals/gaskets can also be checked under full
load with an inspection mirror. If required, remove
the thermal insulation components. Traces of
condensate on the outside of flue gas collector C
also point towards a leak.
IMPORTANT
When inspecting or servicing the flue gas pipe coupling
inspect the coupling for leaks using a certified leak detector.
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