Air Purge Function - Daikin Altherma R Hybrid Installer's Reference Manual

10 | Commissioning

10.4.3 Air purge function

Installer reference guide
156
Yes
Modify the bypass valve setting to reach
the minimum required flow rate + 2 l/
min
Minimum required flow rate
05+08 models
Purpose
When commissioning and installing the unit, it is very important to remove all air in
the water circuit. When the air purge function is running, the pump operates
without actual operation of the unit and the removal of air in the water circuit will
start.
NOTICE
Before starting the air purge, open the safety valve and check if the circuit is
sufficiently filled with water. Only if water escapes the valve after opening it, you can
start the air purge procedure.
Manual or automatic
There are 2 modes for purging air:
There are 2 modes for purging air:
▪ Manually: the unit will operate with a fixed pump speed (high or low), which can
be set. The position of the 3-way valve for the optional domestic hot water tank
as well as that of the gas boiler's bypass valve can also be set. To ensure all air
will be removed, however, it is recommended NOT to adjust their custom
position.
▪ Automatic: the pump alternates between high speed, low speed and standstill
position. The position of the 3-way valve automatically alternates between that
for space heating and that for domestic hot water heating. The gas boiler is
continuously bypassed. To remove air from the gas boiler, perform a manual air
purge on the gas boiler.
Typical workflow
Purging the air from the system should consist of:
1 Performing a manual air purge
2 Performing an automatic air purge
INFORMATION
Start by performing a manual air purge. When almost all the air is removed, perform
an automatic air purge. If necessary, repeat performing the automatic air purge until
you are sure that all air is removed from the system. During air purge function, pump
speed limitation [9‑0D] is NOT applicable.
Bypass valve foreseen?
No
In case the actual flow rate is below the
minimum flow rate, modifications at the
hydraulic configuration are required.
Increase the space heating loops that
can NOT be closed or install a
pressure‑controlled bypass valve.
9 l/min
CHYHBH05+08AF + EHYKOMB33A
Daikin Altherma R Hybrid
4P471761-1E – 2020.10