Viessmann VITODENS 200 WB2A, Инструкция по установке и обслуживанию

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9 Replacement of Parts
i)
Connect the filling loop, open the CH flow and return valves and re-pressurise
the system to design pressure using the filling loop valves and venting as
necessary. Open the DHW inlet valve. Check all connections for soundness,
and then disconnect the filling loop.
i)
Finally, ensure that the outer casing is secured in position and carry out an
ignition and control check.
9.17 DHW Flow Regulator (to replace or clean)
a)
Gain access by following step 9.1(b).
b)
Isolate the DHW circuit closing the DHW inlet valve. Drain the DHW circuit by
opening any DHW tap below the level of the boiler.
c)
Remove the four 4mm socket head screws securing the cover of the flow switch.
d)
Remove the cover and switch mechanism and disconnect the electrical wiring
from the switch.
e)
Electrically connect the new switch mechanism and replace in the switch body
securing with the four socket head screws.
f)
Open the DHW inlet valve and check for water soundness.
g)
Finally, ensure that the outer casing is secured in position and carry out an
ignition and control check.
9.18 DHW Flow Switch Sensor
a)
Gain access by following step 9.1(b).
b)
Isolate the central heating circuit by closing the flow and return valves. Drain
the appliance using the drain point situated underneath the appliance at the
bottom right hand side.
9.19 Pump Head
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