Primary circuit flow
Primary circuit return
Domestic hot water outlet
Heating circuit flow
Heating circuit return
Domestic cold water inlet
Dimensions
Wall-mounted Heat Interface Unit - HIU, SATK series
SATK15
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
© Copyright 2023 Calef
78265.01
www.calef.com
Function
The SATK Heat Interface Unit (HIU) independently controls the heating
and domestic hot water generation in an individual apartment within a
centralised boiler or district heating system.
Product range
HIGH temperature wall-mounted HIU instantaneous production
of DHW, mechanical regulation with 30 kPa DPCV on the ow
side:
SATK15324 DPCV DHW 40 kW
SATK15325 DPCV
for low primary system
Technical specications
Materials
Frame: steel plate
Exchanger: stainless steel copper brazed
Connection pipes: copper
Components: brass EN 12165 CW617N
Performances
Medium: water, max. 30 % glycol
Maximum medium temperature: 85 °C
Max. pressure: - primary circuit: PN 10 bar
- domestic hot water circuit: PN 10 bar
Min p primary side: 40 kPa
Domestic hot water ow rate: min. 1,8 ± 0,3 l/min
max. 18 l/min
HIU connections:
Primary circuit: 3/4” M
Heating circuit: 3/4” M
DHW circuit: 3/4” M
Box contents:
- HIU
- instruction
- xing screws
1
List of components
1 - DHW priority switch
2 - DPCV
3 - Manual air vent
4 - Brazed heat exchanger
5 - Mechanical modulating valve
with manual pre-set
6 - DCW strainer
7 - Port for temperature probe
(SATK15325 DPCV)
7
2
3
4
5
6
1
A
210
G
C
9
157 73,5
I
B
21883,5
70
H
130
(169)
D
L
15
P
20
O
48
N
78 (117)
3/4”
E
M
175
F
AA
L
F
N
G
L
M
P
O
B
E
D
E E E
E E
C
G H
B
I
EN
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