9 Commissioning
Installer reference guide
74
RRLQ004~008CA + RHBH/X04+08CB
ROTEX HPSU low temperature Bi‑bloc
4P384979-1C – 2017.04
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
"9.4.4 To perform an
actuator test run" on page 75
).
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
No
Modify the bypass valve setting
to reach the minimum required
flow rate + 2 l/min
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.
Minimum required flow rate during defrost/backup heater
operation
04+08 models
12 l/min
11+16 models
15 l/min
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 or the domestic hot water
heating mode. The operation speed of the pump (slow or quick)
can also be set.
▪ Automatic: the unit automatically changes the pump speed and
the position of the 3-way valve between the space heating or the
domestic hot water heating mode.
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.
Make sure that the leaving water temperature home page, room
temperature home page, and domestic hot water 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, room temperature home page, and domestic hot water home
page are turned OFF.
1
Set the user permission level to Installer. See
"To set the user
permission level to Installer" on page 46
.
2
Set the air purge mode: go to [A.7.3.1]
> Installer settings >
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
to start the air purge
function.
Result:
The manual air purge starts and the following screen
appears.
01:18
Tue
Air purge
l/min
Low
SHC
0.5
Flow rate
Speed
Circuit
Stop
Adjust
Scroll
5
Use the and buttons to scroll to Speed.
6
Use the and buttons to set the desired pump speed.
Result:
Low
Result:
High
7
If applicable, set the desired position of the 3-way valve (space
heating/domestic hot water)(space heating/domestic hot water).
Use the and buttons to scroll to Circuit.
8
Use the and buttons to set the desired position of the 3-way
valve (space heating/domestic hot water).
Result:
SHC
Result:
Tank
To perform an automatic air purge
Prerequisite:
Make sure that the leaving water temperature home
page, room temperature home page, and domestic hot water home
page are turned OFF.
1
Set the user permission level to Installer. See
"To set the user
permission level to Installer" on page 46
.
2
Set the air purge mode: go to [A.7.3.1]
> Installer settings >
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
to start the air purge
function.
Result:
Air purging will start and the following screen will be
shown.
01:18
Tue
Air purge
l/min
Low
SHC
0.5
Flow rate
Speed
Circuit
Stop
Adjust
Scroll
To interrupt air purge
1
Press
and press
to confirm the interruption of the air
purge function.
