Viessmann VITOMAX 200-HS Operating And Service Instructions page 37

Commissioning
Once the safety pressure limiter has
responded and a fault shutdown of the
boiler has been carried out, the safety
pressure limiter should be reset after a
pressure drop in the boiler and the boiler
should be started again in standard
mode.
After a successful function check, the
safety pressure limiter must be sealed to
protect it against unauthorised adjust-
ment.
Safety valve function check
This function check serves to check the
set pressure and to verify that the safety
valve is capable of blowing off the
amount of steam occurring at full load.
Prior to implementing the function check,
verify that the discharge pipe has been
correctly routed and secured, that the
dewatering line has been connected to
the safety valve and that its outlet is
unobstructed and that no personnel are
anywhere near this area.
To check the safety valve, take the fol-
lowing steps:
■ Close the steam valve
■ Bypass the pressure regulator (key
switch or test button at the control
panel)
■ Bypass the safety pressure limiter in
the control panel
■ Set the burner to full load
(cont.)
The safety valve must open when the set
pressure has been reached; this must be
equal to or lower than the maximum per-
missible operating pressure of the boiler.
The boiler pressure can rise up to 10 %
above the permissible operating pres-
sure before the safety valve opens. If the
pressure inside the boiler remains below
this value, then the valve functions cor-
rectly and the boiler can be shut down.
The function check must only be carried
out with a trained supervisor. For this
ensure that the boiler can be shut down
immediately and at any time via the
"EMERGENCY STOP".
TDS controller adjustment
This adjustment must also be made in
accordance with the manufacturer's
instructions. The maximum permissible
boiler water conductivity is specified in
the water standards (e.g. EN 12953, part
10 or page 23); these may differ. The
max. value must not exceed
6000 µS/cm to 20 bar. Agree the control
value with the user. Test the limit value
switch function regarding the max. con-
ductivity by reducing the set value.
Boilout
For technical or safety reasons, a boilout
prior to commissioning the boiler is not
required for shell boilers.
Plugs/closures on the water side
During commissioning, check all plugs/
closures and flanges on the water side
for tightness and retighten in accordance
with page 46 point 17.
Commissioning
37