Air Purge Function - Daikin EWYA004D2V3P Installer's Reference Manual

12 | Commissioning

12.4.2 Air purge function

Installer reference guide
188
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
2 Performing an automatic air purge
NOTICE
When purging air with the manual air purge valve of the unit, collect any fluid that
might leak out of the valve. If this fluid is NOT collected, it might drip on internal
components and damage the unit.
INFORMATION
▪
To purge air, use all air purge valves present in the system. This includes the
automatic or manual air purge valve of the outdoor unit, as well as any field-
supplied valves.
▪
If the system contains an external backup heater kit, also use the air purge valve
of the backup heater.
▪
If the system contains valve kit EKMBHBP1, it is required to – during the air purge
– manually switch the position of the valve kit's 3‑way valve by turning its knob,
this to prevent air from remaining in the bypass. For more information, see
"9.2.3 External backup heater
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.
4
kit" [ 82].
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09