Checking The Refrigerant Circuit For Leaks; Filling And Venting On The Primary Side; Filling And Venting On The Secondary Side - Viessmann Vitocal 300-G Installation And Service Instructions For Contractors

Further details regarding the individual steps

Checking the refrigerant circuit for leaks

1. Check the floor area, valves and all
visible solder joints for traces of oil.
Note
Traces of oil indicate a leaking refrig-
erant circuit. Have your heat pump
checked over by a refrigeration engi-
neer.

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 106).
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.
Commissioning, inspection, maintenance
(cont.)
2. Check the heat pump interior with a
refrigerant leak detector or leak
detecting spray for refrigerant leaks.
3. Check the connections for possible
leaks. Replace faulty or displaced
gaskets.
1. Open any on-site non-return valves
installed.
2. Check the pre-charge pressure of the
expansion vessel (see page 106).
3. Fill (flush) and vent secondary cir-
cuit:
105