Daikin Altherma 3 R ECH2O - About the system; Components in a typical system layout

2 Product description
Installation and operating manual
10
Daikin Altherma EHS(X/H)(B)-D
Daikin Altherma 3 R ECH₂O
008.1451099_00 – 07/2020
Internal structure…04P50D…/…08P50D...
 2‒4 Design and components - Internal
structure ...04P50D/...08P50D… (Biv)
a Solar flow
b Cold water connection
c Hot water
d Heating flow
e Heating return flow
f Circulation pump
g Pressure relief valve
h Storage tank (polypropylene, double-walled jacket with
PUR hard foam heat insulation)
i Filling and draining connection or solar return flow
connection
j Mount for solar controller or handle
k Heat exchanger (stainless steel) for domestic hot water
heating
l Heat exchanger (stainless steel) for storage tank
charging or heating support
m Biv heat exchanger (stainless steel) for charging with
external heat generator (e.g. pressurised solar system)
n Connection for optional electrical backup heater EKBUxx
o Fill level indicator (tank water)
p Optional: electric backup heater (EKBUxx)
q Submersible sensor sleeve for storage tank temperature
sensor t
DHW1
and t
DHW2
r Pressureless storage tank water
s Solar zone
t Hot water zone
u Safety overflow connection
v Mount for handle
w Protective cover
x Solar return flow
y Biv flow
z Biv return flow
aa Plate heat exchanger
ab Connection for refrigerant fluid line
ac Connection for refrigerant gas line
ad Optional: Solar control and pump unit
ae Circulation stop valve (accessory)
af Solar flow layering pipe
3UVB1 3‑way changeover valve (internal heat generator circuit)
3UV DHW 3‑way changeover valve (hot water/heating)
DS Pressure sensor
FLS FlowSensor
MAG Expansion vessel (on the building side)
t
DHW1
, t
DHW2
Storage tank temperature sensor
t
R
Return temperature sensor
t
V,BH
Backup heater inflow temperature sensor
2.2 Function of the 3‑way changeover
valves
 2‒5 Function of 3‑way changeover valve