Opening The Heat Pump; Preparing Reports; Checking The Refrigerant Circuit For Tightness; Filling And Venting On The Secondary Side - Viessmann Vitocal 300-A Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Opening the heat pump

Danger
Contact with live components can lead to seri-
ous injury from electric current.
■ Never touch wiring chambers.
– Heat pump controller: see page 29.
Terminal area in the heat pump: see
–
page 23.
When working on the appliance, isolate the
■
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer 'live' and safeguard
against reconnection.
Prior to working on the appliance, wait at
■
least 4 min until the voltage has completely
dropped out.
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
All earth connectors must be reconnected.
The appliance and pipework must be connected
to the equipotential bonding of the building.

Preparing reports

Enter readings taken during commissioning into the
reports from page 86 and into the operator's log.

Checking the refrigerant circuit for tightness

Danger
The refrigerant is a non-poisonous gas that dis-
places air. Unregulated escape of refrigerant in
enclosed spaces can lead to breathing difficul-
ties and suffocation.
Ensure adequate ventilation in enclosed
■
spaces.
■ Always observe regulations and guidelines on
handling this type of refrigerant.
Danger
Direct contact with refrigerant can be harmful to
skin.
Wear safety goggles and protective gloves when
working on the refrigerant circuit.

Filling and venting on the secondary side

Unsuitable fill and top-up water increases the level of
deposits and corrosion. This can lead to system dam-
age.
Observe VDI 2035 regarding quality and amount of
heating water, including fill and top-up water.
50
!
Please note
Commissioning immediately after installation
can lead to appliance damage.
Wait at least 30 min between installing and
commissioning the appliance.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
Work on the refrigerant circuit must only be car-
ried out by a certified contractor (in accordance
with EC 842/2006 and 303/2008).
1. Remove outer casing: steps 3 to 11 from page 48
in reverse order
2. If necessary, open the wiring chamber: see
page 22.
3. If necessary, open the heat pump controller: see
page 42.
4. When work is complete, assemble heat pump and
heat pump controller.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
Work on the refrigerant circuit must only be car-
ried out by a certified contractor (in accordance
with EC 842/2006 and 303/2008).
Check the floor area, valves and all visible solder joints
for traces of oil.
Note
Traces of oil indicate a leak in the refrigerant circuit.
Have your heat pump checked over by a refrigeration
engineer.