Air Purge Function - Daikin Altherma 3 R F Installer's Reference Manual

10 | Commissioning

10.4.2 Air purge function

Installer reference guide
144
Yes
Modify the bypass valve setting to reach
the minimum required flow rate + 2 l/
min
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:
▪ Manual: You can set the pump speed to low or high. You can set the circuit (the
position of the 3-way valve) to Space or Tank. Air purge must be performed for
both space heating and tank (domestic hot water) circuits.
▪ Automatic: The unit automatically changes the pump speed and switches the
position of the 3-way valve between the space heating and the domestic hot
water circuit.
Typical workflow
Purging the air from the system should consist of:
1 Performing a manual air purge for both zones
2 Performing an automatic air purge for both zones
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.
The air purge function automatically stops after 30 minutes.
INFORMATION
For best results, air purge each loop separately.
Bypass valve foreseen?
No
In case the actual flow rate is below the
minimum flow rate (required during
defrost/backup heater operation),
modifications at hydraulic configuration
are required. Increase the space heating
loops that can NOT be closed or install a
pressure controlled bypass valve.
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1 – 2019.10