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Key names
Short desig-
nation
Explanation
EBLQ
Heat pump outdoor unit
EKHWMX
Indoor unit
3UVB1
3-way switch valve (internal heat generator cir-
cuit)
3UV
DHW
3-way switch valve (hot water / heating)
AUX
A-A1-
A2
Switchover output: Function, see control system
manual, parameter [AUX Fct]
B-B1
Switching contact output for status of operating
mode "Cooling" or as a switchover contact (heat-
ing/cooling), e.g. for a floor heating controller
EKBUxx
Backup heater
EBA
Switching contact for external requirement
request
EXT
Switching contact for external operating mode
switchover
F1
Fuse 250
V T 2
A (RoCon
BM2C)
FU1
Fuse 250
V T 3.15
A (A1P in the outdoor unit)
HPc-VK-1
Connecting cable between Altherma M ECH
2
O
(with cooling function) and FWXV-ATV3
HT/NT
Switching contact for off-peak mains connection
P
hyd
Pressure sensor
P
Z
Circulation pump
RJ45 CAN
Internal wiring plug connection (RoCon
BM2C)
(to RoCon
B1)
RoCon
B1
Controller control panel
RoCon
BM2C Printed circuit board (basic controller module)
RoCon
BM2C
J1
Not assigned
J2
Plug connection 3UVB1
J3
AUX switching contact plug connection
J4
Plug connection - not assigned
J5
Pressure sensor plug connection
J6
Plug connection mains voltage
J7
Not assigned
J8
Plug connection EXT
Plug connection EBA
Smart
Grid plug connection EVU switching con-
tact
Plug connection t
V,
BH
Storage tank temperature sensor t
DHW
plug con-
nection
HT/NT plug connection EVU switching contact
J9
Not assigned
J10
Not assigned
J11
Internal wiring plug connection to XAG1
J12
Plug connection 3UV
DHW
J13
System bus plug connection (e.g. room station)
J14
Circulation pump P
Z
plug connection
J15
Internal wiring plug connection (bridging plug)
J16
Room thermostat (EKRTR / EKRTW) plug con-
nection
EHS157068
Mixer module
EHS157034
Room station
RT
Room thermostat (EKRTW)
RT-E
Receiver for wireless room thermostat (EKRTR)
RTX-EHS
Printed circuit board (backup heater)
RTX-EHS
K1
Relay 1 for backup heater
K2
Relay 2 for backup heater
K3
Relay 3 for backup heater
X1
Terminal strip for backup heater mains connec-
tion
X3
Internal wiring plug connection to J17
(RoCon
BM2C)
SG
Switching contact for Smart
Grid (intelligent
mains connection)
t
DHW
Storage tank temperature sensor 1
(RoCon
BM2C)
t
V,
BH
Backup heater feed temperature sensor
(RoCon
BM2C)
XAG1
Heat pump outdoor unit plug connection
XBUH1
Backup heater plug connection (EKBUxx)
X2M6
Connecting cable terminal HPc-VK-1
X2M7
Connecting cable terminal HPc-VK-1
X11M
Terminal strip in FWXV-ATV3
Tab.
4-3 Key names for connection and wiring diagrams
4
x
Set-up and installation
Daikin Altherma M ECH
2
O
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
Installation and maintenance instructions
31
4.6 Filling the system on the water side
Fill the Daikin Altherma M ECH
2
O only after completion of all
installation work in the order shown below.
4.6.1 Checking the water quality and adjusting the
pressure gauge
●
Observe the notes on the water connection and water quality
according to chap.
The correct minimum pressure mark must be set on the pressure
gauge installed in the building before initially filling the system:
●
Rotate the pressure gauge glass so that the minimum
pressure mark corresponds to the
system 2
m
(1
m water column = 0.1
bar).
4.6.2 Filling the hot water heat exchanger
●
Open the shutoff valve for the cold water supply pipe.
●
Open the hot water tap connections so that the draw-off
volume can be set as high as possible.
●
Once water has been discharged from the tap connections do
not interrupt the cold water flow; this will ensure that the heat
exchanger will be fully vented and that any impurities or resi-
due will be discharged.
4.6.3 Filling the storage tank
See chap.
7.3.
4.6.4 Filling the heating system
See chap.
7.4.
Key names
Short desig-
nation
Explanation