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Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Maintenance
7
7.8 Carrying out maintenance work on the refrigerant circuit
CAUTION
Danger of injury due to unprofessional handling of refrigerants
Unprofessional handling of refrigerants leads to various dangers of injury such as freezing, fire and
the danger of explosions and the danger of intoxination.
► Working with the refrigerant must be done by a trained skilled person or an authorised
dealer with refrigerant certification.
►
Observe all the Safety Notes in force for the respective refrigerant (R32, R410A or
R407C).
►
Before commencing work on the refrigerant circuit, the refrigerant must always be
pumped down first.
i
Note
Instructions for switching on the pump-down operation as well as for operating the devices can be
found in the operating instructions for the respective device.
Carry out the following steps:
1. Switch the device to pump-down operating mode on the remote controller. To do so, follow
the instructions given in the operating instructions of the respective device.
2. Operate the system in pump-down mode for 10 to 15 minutes (or for 1 to 2 minutes, if the
ambient temperature is below 10 °C), in order to pump the refrigerant out of the pipes.
3. Close the 2-way valve fully after the time stated.
4. Close the 3-way valve fully after a further 3 minutes.
5. Stop the pump-down mode on the remote controller. To do so, follow the instructions given in
the operating instructions of the respective device.
6.
Carry out the required maintenance work on the refrigerant pipes. When doing this,
adhere to the Safety Notes and instructions regarding connecting the refrigerant circuit
(→
6.6 Connecting the refrigeration circuit, p. 158
).
7.
Start the system up again after the work has been completed (→
). When doing this, pay particular attention to the Safety Notes and instructions
regarding evacuating the refrigerant circuit (→
6.9.1 Evacuating the refrigerant circuit and
).
