52
3.
Charge the primary circuit with Viessmann heat
transfer medium and vent.
Note
Depending on the main heat source, the following
minimum frost protection must be observed:
■
Ground (brine/water direct) = –16.1 °C (freezing
point)
■
Water (water/water with intermediate circuit) =
–9.0 °C (freezing point)
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■
Check tightness of the internal and on-site
hydraulic connections.
■
In the event of leaks, switch off the appli-
ance immediately. Drain the primary circuit
and check the seating of the seals.
Always
replace damaged or displaced
seal rings.
Filling and venting on the secondary side
!
Please note
Commissioning when the secondary circuit is
empty causes appliance damage.
Charge and vent the secondary circuit before
connecting the power supply.
Note
Before
filling the system, observe VDI 2035 part 1.
1.
Check the Victaulic connections in the heat pump
for tightness. The Victaulic couplings must be form-
locked and fitted together seamlessly.
2.
Open any on-site non-return valves if installed.
3.
Check the pre-charge pressure of the expansion
vessel.
4.
Fill (flush) and vent the secondary circuit.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■
Check tightness of the internal and on-site
hydraulic connections.
■
In the event of leaks, switch off the appli-
ance immediately. Drain the secondary cir-
cuit and check the seating of the seals.
Always
replace damaged or displaced
seal rings.
5.
Check the system pressure and top up with water if
required.
Minimum system pressure: 0.8 bar (80 kPa)
Permiss. operating pressure: 6 bar (0.6 MPa)
Checking expansion vessels and primary circuit/secondary circuit pressure
Observe engineering information.
Heat pump technical guide
Checking the electrical connections for firm seating
Commissioning, inspection, maintenance
Filling and venting on the primary side
(cont.)
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