202 Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Maintenance
Carry out the following steps:
1. Switch the device into pumping-out operating mode via the operating unit. While doing
this, follow the instructions given in the operating instructions of the respective device.
16. Operate the system in pumping-out mode for 10 to 15 minutes (or for 1 to 2 minutes in
case of a lower ambient temperature of below 10 °C) in order to pump the coolant out of
the pipes.
17. Close the 2-way valve fully after the time stated.
18. Close the 3-way valve fully after a further 3 minutes.
19. End the pumping-out operation via the operating unit. While doing this, follow the instruc-
tions given in the operating instructions of the respective device.
2. Carry out the work on the coolant pipes. When doing this, adhere to the Warning Notices
and instructions regarding connecting the cooling circuit (→ 6.6 Connecting the cooling
circuit, p. 152).
3. Set the system in operation again after the work has been completed (→ 6.9 Starting up
the system, p. 191). When doing this, pay particular attention to the Warning Notices
and instructions regarding emptying the cooling circuit (→ 6.9.1 Emptying the cooling
system and carrying out a pressure test, p. 191).
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