Vaillant aroTHERM Series, Operating Instructions Manual

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5 Hydraulics installation
66
Installation and maintenance instructions aroTHERM 0020257297_02
Result 2:
The pressure increases.
▶
There is a leak: Check the flare connections on the
outdoor unit and indoor unit. Eliminate the leakage.
Start the second test (step 7).
▶
There is residual moisture: Carry out a drying pro-
cess. Start the second test for this (step 7).
7. Second test : Switch on the vacuum pump. Drain the
refrigerant pipes and the indoor unit's plate heat ex-
changer.
–
Absolute pressure to be reached: 0.1 kPa
(1.0 mbar)
–
Running time of the vacuum pump: 30 minutes
8. Switch off the vacuum pump. Wait three minutes.
Check the pressure.
Result 1:
Pressure is stable:
▶
The second test is complete. Close the ball valves
(2) and (4) .
Result 2:
The pressure increases.
▶
Repeat the second test.
5.8 Adding additional refrigerant
Danger!
Risk of injury due to escaping refrigerant.
Touching any escaping refrigerant may
cause injury.
▶
Use protective equipment (protective
goggles and gloves).
1. Determine the basic length of the refrigerant pipe. Cal-
culate the required volume of refrigerant.
Product Basic length of
the refrigerant
pipe Required addi-
tional refrigerant
All
≤
15 m None
VWL 35/5 and
VWL 55/5 > 15 m 30 g for every addi-
tional metre (above
15 m)
VWL 75/5 to
VWL 125/5 > 15 m 70 g for every addi-
tional metre (above
15 m)
Condition : Length of the refrigerant pipe > 15 m
▶
Ensure that the two isolation valves on the outdoor unit
are still closed.
R410A
2
3 4
5
1
▶
Connect the refrigerant fitting (2) with the ball valve (1)
to a refrigerant cylinder (4) .
–
Refrigerant to be used: R410A
▶
Put the refrigerant cylinder on the scales (5) . If the refri-
gerant cylinder does not have an immersion sleeve, put
it on the scales upside down.
▶
Leave the ball valve (3) closed. Open the refrigerant
cylinder and the ball valve (1) .
▶
If the hoses have been filled with refrigerant, set the
scales to zero.
▶
Open the ball valve (3) . Fill the outdoor unit with the cal-
culated refrigerant volume.
▶
Close both of the ball valves.
▶
Close the refrigerant cylinder.
5.9 Opening the isolation valve, releasing the
refrigerant
Danger!
Risk of injury due to escaping refrigerant.
Touching any escaping refrigerant may
cause injury.
▶
Use protective equipment (protective
goggles and gloves).
1
1. Remove both covering caps (1) .
2. Unscrew both hexagon socket screws as far as they will
go.
◁
The refrigerant flows into the refrigerant pipes and
the indoor unit (heat exchanger).