Vaillant aroTHERM plus VWL 105/6 A 230V S2 Operating Instructions Manual page 80

11.4.4 Checking the automatic air vent and
expansion relief valve
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2
1. Remove the cap from the automatic air vent (1).
2. Check that the automatic air vent is open.
3. Check the automatic air vent for leaks. if required, re-
place the automatic air vent.
4. Secure the cap on the automatic air vent.
5. Check that the expansion relief valve (2) is working
correctly.
11.4.5 Checking the evaporator, fan and
condensate discharge
1. Clean the gaps between the fins using a soft brush. In
doing so, avoid fins being bent.
2. Remove any dirt and depositions.
3. If required, straighten out any bent fins using a fin
comb.
4. Turn the fan by hand.
5. Check that the fan runs freely.
6. Remove the dirt that has accumulated on the condens-
ate tray or in the condensate discharge pipe.
7. Check that the water can drain freely. Poor approx. 1 l
water into the condensate tray.
8. Ensure that the heating wire is inserted into the con-
densate discharge tundish.
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11.4.6 Checking the refrigerant circuit
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1. Check whether the components and pipelines are free
from dirt and corrosion.
2. Check that the covering caps (1) and (2) on the main-
tenance connections are positioned securely.
11.4.7 Checking the refrigerant circuit for tightness
1. Check whether the components in the refrigerant circuit
and the refrigerant pipes are free from damage, corro-
sion and oil leaks.
2. Check the refrigerant circuit for leak-tightness using a
gas sniffer. In doing so, check all of the components
and pipelines.
3. Document the result of the leak-tightness test in the
service book.
11.4.8 Checking the electrical connections and
electrical wires
1. On the connection box, check whether the seal is un-
damaged.
2. In the connection box, check that the electrical wire are
seated firmly in the plugs or terminals.
3. Check the earthing in the connection box.
4. Check whether the power supply cable is damaged. If
it needs to be replaced, ensure that it is only replaced
by Vaillant or customer service or a similarly qualified
person in order to prevent hazards.
5. In the unit, check that the electrical wire are seated
firmly in the plugs or terminals.
6. In the unit, check whether the electrical wires are free
from damage.
11.4.9 Checking the small damping feet for wear
1. Check whether the damping feet are significantly com-
pressed.
2. Check whether the damping feet have significant
cracks.
3. Check whether there is substantial corrosion on the
screwed connection for the damping feet.
4. If required, procure and install new damping feet.
Installation and maintenance instructions 0020326637_00
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