12
|
Commissioning
Installer reference guide
259
ERRA08~12E + ELVH/23E
Daikin Altherma 3 R MT F
4P708474-1 – 2023.05
12.4.1 Minimum flow rate
Purpose
For a correct operating unit, it is important to check if the minimum flow rate is
reached. If needed, modify the bypass valve setting.
If operation is…
Then the minimum required flow rate
is…
Cooling
10 l/min
Heating/defrost
20 l/min
To check the minimum flow rate
1
Check the hydraulic configuration to find out which space
heating loops can be closed by mechanical, electronic, or other
valves.
—
2
Close all space heating loops that can be closed.
—
3
Start the pump test run (see
261]).
—
4
Read out the flow rate
(a)
and modify the bypass valve setting to
reach the minimum required flow rate + 2 l/min.
—
(a)
During pump test run, the unit can operate below the minimum required flow rate.
12.4.2 Air purge function
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
