Changing The Pre-Pressure Of The Expansion Vessel - Daikin EBLA04E2V3 Installer's Reference Manual

8.1.4 Changing the pre-pressure of the expansion vessel

EBLA04~08E2V3+E23V3 + EDLA04~08E2V3+E23V3
Daikin Altherma 3 M
4P685228-1A – 2022.05
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup heater
operation (if applicable)) in the installation is guaranteed in all conditions.
If operation is...
Cooling
Heating
BUH operation
Heating defrost
DHW
NOTICE
If glycol was added to the water circuit, and the temperature of the water circuit is
low, the flow rate will NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump test.
NOTICE
When circulation in each or certain space heating loops is controlled by remotely
controlled valves, it is important that the minimum flow rate is guaranteed, even if all
valves are closed. In case the minimum flow rate cannot be reached, a flow error 7H
will be generated (no heating or operation).
See the recommended procedure as described in
4
commissioning" [ 226].
NOTICE
ONLY a licensed installer may adjust the pre-pressure of the expansion vessel.
The default pre-pressure of the expansion vessel is 1 bar. When it is required to
change the pre-pressure, take following guidelines into account:
▪ Only use dry nitrogen to set the expansion vessel pre-pressure.
▪ Inappropriate setting of the expansion vessel pre-pressure will lead to
malfunction of the system.
Changing the pre-pressure of the expansion vessel should be done by releasing or
increasing nitrogen pressure through the Schrader valve of the expansion vessel.
8 Piping installation
|
Then the minimum required flow rate
is...
10 l/min
6 l/min
12 l/min
12 l/min
25 l/min
"12.4 Checklist during
Installer reference guide
77