43
STB
KOL
SOL
M
1~
27
15
21
24
16
23
L
N
L
N
3
4
1
2
145
1
2
26
40
24
22
6
5
44
40A
1
2
PWM
44
145
M
1~
L
N
ID: 4605301_1006_02
System version 3
One heating circuit without mixer and
two heating circuits with mixer and
DHW heating (optional solar DHW
heating)
Applications
Heating system with different heat sour-
ces and methods of DHW heating
■ One heating circuit without mixer
■ Two heating circuits with 3-way mixer
Main components
■ Gas condensing boilers 26 to 60 kW
■ Heating circuit distribution
■ DHW cylinder (dual mode)
■ Solar thermal system
Function description
The heating circuits
eP
/
rP
/
tP
and DHW
cylinder
qP
/
qR
are regulated by boiler
heating circuit controller
1
. The heating
circuits and DHW cylinder are each sup-
plied by a separate circulation pump
eQ
/
rR
/
tR
and
qE
.
Heating mode
The boiler heating circuit controller reg-
ulates the boiler water temperature in
weather-compensated mode (= flow
temperature of the heating circuit without
mixer) and the temperature level of the
heating circuit with mixer via an exten-
sion kit for one heating circuit with
mixer.
DHW heating without a solar thermal
system
If the temperature falls below the set
DHW temperature selected at control
unit
2
, the burner of boiler
1
starts
and circulation pump
qE
of DHW cylin-
der
qP
or
qR
runs.
Within the periods selected at control
unit
2
, DHW is heated with or without
priority.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 860 GB
Summary of Contents for CU3A
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