Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 120

Commissioning, inspection, maintenance
Further details regarding the individual steps
Filling and venting on the primary side
!
Please note
To prevent equipment damage,
fill the primary circuit before con-
necting the power supply.
1. Check the pre-charge pressure of the
expansion vessel (see page 121).
2. Fill the primary circuit with
Viessmann heat transfer medium
and vent.
Note
The system must be protected
against frost down to –15 °C.
Filling and venting on the secondary side
!
Please note
To prevent equipment damage,
protect electrical components on
the control unit door from escap-
ing liquids.
Note
Before filling the system, observe
VDI 2035 sheet 1.
1. Open any on-site non-return valves
installed.
2. Check the pre-charge pressure of the
expansion vessel (see page 121).
3. Fill (flush) and vent secondary cir-
cuit:
120
(cont.)
3. Check the connections for possible
leaks. Replace faulty or displaced
gaskets.
!
4. Please note
To prevent equipment dam-
age, check the flow and return
connections of the secondary
heat pump circuit for leaks.
In case of leaks, immediately
shut off the equipment, drain
the water and check the seat-
ing of the seal rings. Replace
all seal rings that may have
become dislodged.
5. Check the system pressure and top
up with water if required.
Minimum system pressure: 0.8 bar
Permiss. operating pressure: 2.5 bar