8 Hydraulic connection
54
Company ROTEX ESU - 07/2008
Maintenance
Thermal and pressure expansion and the high flow rates in the heat exchangers cause limescale residue to peel away; this residue
is rinsed out and is not deposited. The limescale-causing components that are present in the water can only be released once, in
the water you use to fill the storage tank. Thanks to the smooth surface of the stainless steel corrugated pipe heat exchanger,
no limescale crust forms (no reduction in heat transfer performance over time).
No corrosion protection equipment is required (such as expendable anodes). This means that associated maintenance work,
e.g. changing the protective anodes or cleaning the storage tank, does not need to be carried out. During the yearly inspection
only the filling level is checked and refilled if needed (see Chapter 9).
8.3
Hydraulic system connection
8.3.1 Short designations used in connection diagrams
Tab. 8-1
Short designations used in hydraulic diagrams (1)
Tab. 8-2
Short designations used in hydraulic diagrams (2)
Short des.
Meaning
Comment
Order no.
ROTEX ESU 509 E-SolarUnit with solar heating support
ROTEX ESU 509
15 70 50 - 44
1
Cold water
2
Hot water
3
Heating flow
4
Heating return flow
P
K
Boiler circuit pump
Included in the scope of delivery of the ROTEX ESU
UV1
3-way diverter valve
Included in the scope of delivery of the ROTEX ESU
t
WW
Storage tank temperature sensor
Included in the scope of delivery of the ROTEX ESU
t
V
Heating flow temperature sensor
Included in the scope of delivery of the ROTEX ESU
t
R
Heating return flow temperature sensor
Included in the scope of delivery of the ROTEX ESU
t
AU
External temperature sensor
Included in the scope of delivery of the ROTEX ESU
SV
Safety pressure relief valve
Included in the scope of delivery of the ROTEX ESU
5
Mixer circuit
Optional
AMK1
Mixer group
Accessories
15 60 44
P
MI
Mixer circuit pump
Included in the AMK1 scope of delivery
MI
3-way mixer with drive motor
Included in the AMK1 scope of delivery
t
MI
Mixer circuit flow temperature sensor
Accessories
15 60 62
7
Non-return valve, return flow inhibitor
Provided by customer
8
Solar circuit
Optional
SK
High-performance flat solar panel
Accessories
RPS3
Solaris control and pump unit
Accessories
16 41 06 - 44
P
S1
Duty pump
Included in the RPS3 scope of delivery
P
S2
Booster pump
Included in the RPS3 scope of delivery
Short des.
Meaning
Comment
Order no.
t
S, R
Solaris return flow temperature sensor
Included in the RPS3 scope of delivery
t
S
Solaris storage tank temperature sensor
Included in the RPS3 scope of delivery
t
S, V
Solaris flow temperature sensor
Included in the RPS3 scope of delivery
t
K
Solaris panel temperature sensor
Included in the Connect AB panel connection set scope
of delivery
FLS
Flow sensor
Accessories
16 41 07
VS
Scalding protection VTA 32
Accessories
15 60 15
ÜV
Bypass valve
Provided by customer
WE
External heat generator (e. g. wood pellet boiler, heating pump)
Provided by customer
P
WE
Pump for external heat generator circuit
Provided by customer
t
WE
Temperature sensor for external heat generator
Included in the SCS-TR scope of delivery
UV2
3-way diverter valve
Accessories
15 60 34
SCS-TR
Thermostat controller
Accessories
16 41 30
Disconnecting the standard connection – UV1 and heating pump P
K
must be
taken out of the unit and reconnected outside it.
Provided by customer
