4
Set-up and installation
Installation and operating instructions
25
Daikin/ROTEX A2 F
Oil condensing boiler A2 F
008.1546499_02 – 04/2018 – EN
The current operating mode is switched by a changing resistance
value (
Tab. 4-11
). The changeover of the operating mode is only ef-
fective for a long as the external switching contact is closed.
The operating mode has an effect on the direct circuit of the A2 F as
well as all other heating circuits connected to this device as an op-
tion.
The operating mode shown on the controller display may differ from
the operating mode
activated in the rotary switch position.
An operating mode activated by the external switching contact is
shown on the controller display by "EXT." followed by the symbol for
the operating mode (see the controller operating instructions).
When special functions (e.g. "Manual Operation") are activated, the
input is not evaluated.
Fig. 4-17
EXT switching contact connection
Operating mode
Resistance RV
Tolerance
Standby
< 680 Ω
± 5%
Heating
1200 Ω
Reducing
1800 Ω
Summer
2700 Ω
Automatic 1
4700 Ω
Automatic 2
8200 Ω
Tab. 4-11
Resistance values for evaluating the EXT signal
INFORMATION
The input is not considered for resistance values greater
than the value for "Automatic 2".
4.8
Connect the oil line
4.8.1
Important instructions for oil connection
Oil connection
▪ Implement the oil connection in the single strand system with a
venting oil filter fitted on the suction side according to the local
regulations (DIN 4755).
INFORMATION
We recommend using EL low sulphur heating oil in order to
achieve the highest efficiency and to keep the mainten-
ance expenditure low. Bio heating oil can be mixed in.
4.8.2
Connecting the oil filter
Fig. 4-18
Connecting the oil filter
Item
Designation
A
Heating oil line
B
Heating oil suction line
C
Heating oil return line
D
Oil burner
H
oil filter
Tab. 4-12
Legend for
Fig. 4-18
1
Hooking in the oil filter (item H)
2
Connect the heating oil suction line (item B) and the heating oil
return line of the oil burner (item D). Make sure that the heating
oil suction line and heating oil return line are not interchanged.
3
Connect the heating oil line (item A).
