Commissioning And Testing - Viessmann VITODENS 200 WB2A Installation & Servicing Instructions Manual

5 Commissioning and Testing

Before commissioning the appliance, the whole gas installation including the meter MUST be
purged and tested for gas soundness in accordance with BS 6891: 1988. IMPORTANT: Open all
doors and windows; extinguish naked lights and DO NOT SMOKE whilst purging the gas line.
Before commencing the commissioning procedure, ensure that the gas service cock is turned
on, the electricity supply is isolated and that the DHW and CH pipework is complete.
Fill the system with cold water. It may be convenient to carry out this procedure before fitting
the boiler to the piping frame. Vent the system via the radiator valves and system air vents in
accordance with normal practice, close all air vents and check for system soundness.
Drain the entire system to flush out any debris.
The following instructions assume that the casing has not yet been fitted following initial
installation. If the casing has been fitted, it is necessary to remove the casing as described in
section 6.1 (a)
5.1 Filling the Central Heating Circuit
The following procedure is recommended when the boiler has been fitted.
a)
Check that the central heating flow and return valves are open. Turn on the
mains water supply.
b)
Open the filling loop valves and fill the system via the boiler fill and drain valve
(A). Check the system pressure on the gauge and vent all radiators and air
vents in the normal way. Close the filling loop valves before the system
pressure reaches 2.5 bar.
c)
Unscrew the pump spindle cover (in the centre of the pump head) and spin the
pump shaft with a screwdriver to ensure that it routes freely. Replace the
spindle cover.
d)
Check the operation of the pressure relief valve by rotating the plastic head
anticlockwise 1/4 of a turn and checking that water is discharged. Ensure that
the valve seats correctly and does not leak. If the valve leaks or is stuck
closed, replace it.
e)
Check the system for water leaks; the system should then be flushed in
accordance with BS 7593. Upon completion of correct flushing, the system
should be re-filled to 0.2 bar above system design pressure. System design
pressure should be between 1.0 and 1.5 bar.
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