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12.6
Draining the heating installation
1.
Connect a hose to the draining point of the installation.
2.
Route the free end of the hose to a suitable drainage
point.
3.
Ensure that the installation's service valves are open.
4.
Open the draining cock.
5.
Open the purging valves on the radiators. Start from
the highest radiator and then work from the top to the
bottom.
6.
Once the heating water has completely drained from
the installation, close the purging valves on all the radi-
ators and the draining cock again.
12.7
Replacing components of the refrigerant
circuit
▶
Ensure that the work follows the defined procedure, as
described in the sections below.
12.7.1 Removing refrigerant from the product
Danger!
Risk of death caused by fire or explosion
when removing the refrigerant!
The product contains the combustible refri-
gerant R32. The refrigerant may mix with air
to form a flammable atmosphere. There is
a risk of fire and explosion. In the event of a
fire, toxic or corrosive substances, such as
carbonyl fluoride, carbon monoxide or hydro-
gen fluoride, are produced.
▶
Only carry out the work if you are com-
petent at handling R32 refrigerant. If re-
quired, ensure that there is expert monit-
oring of the entire process.
▶
Wear suitable personal protective equip-
ment and bring a fire extinguisher with
you.
▶
Only use tools and units that are permitted
for R32 refrigerant and are in proper work-
ing condition.
▶
Ensure that no air gets into the refrigerant
circuit, into refrigerant-carrying tools or
units, or into the refrigerant cylinder.
▶
Ensure that the expansion valves are
open in order to guarantee that the refri-
gerant circuit is drained completely.
▶
The refrigerant must not be pumped into
the outdoor unit using the compressor,
and the pump-down process must not be
carried out.
1.
Procure the tools and units that are required for remov-
ing the refrigerant:
–
Extraction station
–
Vacuum pump
–
Recycling cylinder for refrigerant
–
Manometer bridge
–
Calibrated refrigerant scales
2.
Only use tools and units that are permitted for R32 re-
frigerant. Discover the benefits of their proper and func-
236
tional condition and the absence of ignition sources of
the electrical components.
3.
Use only functional recycling cylinders that are ap-
proved for R32 refrigerant, have been labelled appro-
priately, and are equipped with a pressure relief and
isolation valve. Ensure that there is a sufficient number
that can absorb the system's total refrigerant volume.
4.
Only use hoses, couplings and valves that are as short
as possible, leak-tight and in proper working condition.
Check the tightness using a gas sniffer.
5.
Ensure that the room is sufficiently aerated around
the product for the entire time that work is carried out
on the product. The aeration must safely dissolve dis-
placed refrigerant and, preferably, divert it outside into
the atmosphere.
6.
Ensure that the outlet of the vacuum pump is not loc-
ated close to potential sources of ignition.
7.
Drain the recycling cylinder. Ensure that the recyc-
ling cylinder is correctly positioned on the refrigerant
scales.
8.
If an evacuation of the entire product is not possible,
create a manifold so that the refrigerant can be re-
moved from the system's different parts.
9.
Extract the refrigerant. In doing so, take into account
the maximum fill quantity of the recycling cylinder, and
monitor the fill quantity (max. 80% volume of the liquid
filling) using calibrated scales. In doing so, never ex-
ceed the permissible operating pressure for the recyc-
ling cylinder.
10.
Ensure that no air gets into the refrigerant circuit, into
refrigerant-carrying tools or units, or into the recycling
cylinder.
11.
Connect the manometer bridge to the isolation valve's
maintenance connection.
12.
Open both expansion valves in order to guarantee that
the refrigerant circuit is drained completely.
13.
Once the refrigerant circuit is completely empty, imme-
diately remove the cylinders and units from the installa-
tion.
14.
Close all of the isolation valves.
Note
Extracted refrigerant must only be used for
another refrigerant system after it is cleaned
and checked.
12.7.2 Removing components of the refrigerant
circuit
▶
Flush the refrigerant circuit with oxygen-free nitrogen.
Never use compressed air or oxygen instead of this.
▶
Drain the refrigerant circuit.
▶
Repeat the process of rinsing with nitrogen and draining
until there is no longer any refrigerant in the refrigerant
circuit.
▶
If you want to remove the compressor, there must no
longer be any flammable refrigerant in the compressor
oil. You should therefore drain it for a sufficient time using
sufficient negative pressure.
▶
Establish the atmospheric pressure.
▶
Use a pipe cutter to open the refrigerant circuit. Do not
use soldering equipment or sparking or chipping tools.
▶
Remove the component.
Installation and maintenance instructions 8000017440_FT
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