Checking Expansion Vessels And The Primary Circuit/ Heating Circuit Pressure - Viessmann Vitocal 350-G Installation And Service Instructions For Contractors

Further details regarding the individual steps
■ Flush the heating system thoroughly
before filling.
■ Only fill with water of potable quality.
■ Soften fill water with a water hardness
above 16.8 °dH (3.0 mol/m
the small softening system for heating
water: See the Vitoset pricelist.
!
Please note
Avoid appliance damage.
Protect electrical components
mounted on the casing door from
escaping liquids.
Note
Before filling the system, observe
VDI 2035 sheet 1.
1. Open any on-site non-return valves if
installed.
2. Check the pre-charge pressure of the
expansion vessel.
3. Fill (flush) and vent the secondary cir-
cuit.
Note
Type BWC is supplied with integral
non-return valves. The secondary cir-
cuit only permits one direction of
flow.
Checking expansion vessels and the primary circuit/heating cir-
cuit pressure
Observe engineering informa-
tion.
Heat pump technical guide
Commissioning, inspection, maintenance
!
4.
3 ), e.g. with
5. Check system pressure. Top up with
water if required.
■ Minimum system pressure:
■ Permiss. operating pressure:
(cont.)
Please note
Avoid appliance damage.
■ Check the secondary circuit
flow and return connections
to the heat pump for tight-
ness.
■ In the case of leaks, switch
off the appliance immedi-
ately, drain the water and
check the seating of the
seal rings. Always replace
displaced seal rings.
0.8 bar (80 kPa)
2.5 bar (250 kPa)
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