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9.4.1
To check the minimum flow rate
1 Confirm according to the hydraulic configuration which space
heating loops can be closed due to mechanical, electronic, or
other valves.
2 Close all space heating loops that can be closed (see previous
step).
3 Start the pump test run operation (see
actuator test run" on
page 68).
4 Go to [6.1.8]:
> Information > Sensor information > Flow rate
to check the flow rate. During pump test run operation, the unit
can operate below this minimum required flow rate.
Bypass valve foreseen?
Yes
Modify the bypass valve setting
to reach the minimum required
flow rate + 2 l/min
Minimum required flow rate
04+05 models
9.4.2
Air purge function
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.
There are 2 modes for purging air:
▪ Manually: the unit will operate with a fixed pump speed and in a
fixed or custom position of the 3-way valve. The custom position
of the 3-way valve is a helpful feature to remove all air from the
water circuit in the space heating mode. The operation speed of
the pump (slow or quick) can also be set.
▪ Automatic: the unit automatically changes the pump speed.
Typical workflow
Purging the air from the system should consist of:
1
Performing a manual air purge
2
Performing an automatic air purge
NOTICE
The outdoor unit is equipped with a manual air purge
valve. The air purge procedure requires manual action.
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.
EWAQ+EWYQ004+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
"9.4.4 To perform an
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.
12 l/min
INFORMATION
▪ To purge air, use all air purge valves present in the
system. This includes the manual air purge valve of the
outdoor unit, as well as any field-supplied valves.
▪ If the system contains a backup heater, 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, refer to the instruction sheet of
the valve kit.
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.
Make sure that the leaving water temperature home page and room
temperature home page are turned OFF.
The air purge function automatically stops after 30 minutes.
To perform a manual air purge
Prerequisite: Make sure that the leaving water temperature home
page and room temperature home page are turned OFF.
1 Set the user permission level to Installer. See
permission level to Installer" on
2 Set the air purge mode: go to [A.7.3.1]
Commissioning > Air purge > Type.
3 Select Manual and press
4 Go to [A.7.3.4]
> Installer settings > Commissioning > Air
purge > Start air purge and press
function.
Result: The manual air purge starts and the following screen
appears.
Tue
Air purge
Flow rate
0.5
l/min
Speed
Low
Stop
Adjust
5 Use the and buttons to scroll to Speed.
6 Use the
and
buttons to set the desired pump speed.
Result: Low
Result: High
To perform an automatic air purge
Prerequisite: Make sure that the leaving water temperature home
page and room temperature home page are turned OFF.
1 Set the user permission level to Installer. See
permission level to Installer" on
2 Set the air purge mode: go to [A.7.3.1]
Commissioning > Air purge > Type.
3 Select Automatic and press
4 Go to [A.7.3.4]
> Installer settings > Commissioning > Air
purge > Start air purge and press
function.
Result: Air purging will start and the following screen will be
shown.
9 Commissioning
"To set the user
page 47.
> Installer settings >
.
to start the air purge
01:18
"To set the user
page 47.
> Installer settings >
.
to start the air purge
Installer reference guide
67
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