45
Terminals
Function
Explanation
X3.10
X3.11
Fault message, lag heat pump in a
cascade
or
Jumper
Requires floating contact:
■
Closed: No faults
■
Open: Fault
■
Breaking capacity 230 V~, 0.15 A
No jumper should be installed if a message contact is
connected.
LP1 X3.12
LP1 X3.13
or at external
H1 extension
"External demand" signal (external
starting of compressor and pumps,
mixer in control mode or OPEN,
changeover of operating mode for
several system components)
Requires floating
N/O
contact:
■
Closed: Demand
■
Open: No demand
■
Breaking capacity 230 V, 2 mA
Note
■
These or other external functions, such as swimming
pool water heating, cascade or external set value pro-
vision can alternatively be connected via external H1
extension (see installation instructions "External H1 ex-
tension").
■
If a swimming pool heating facility is connected to the
external H1 extension,
no
other external function can
be connected to the external H1 extension.
K2 220.2
K2 220.3
Only for 2-stage heat pumps:
Blocking compressor 2 in connec-
tion with DHW heating
Connection, see separate "Connection and wiring dia-
gram" sheet 20.
STB 1
STB 2
High limit safety cut-out (max.
70 °C) for stopping the secondary
pump in conjunction with an exter-
nal heat generator
Connection in series to the secondary pump (terminal
211.2 on main PCB), see separate "Connection and wir-
ing diagram" sheet 20.
ST. 223.1
ST. 223.2
U
Central fault message
Floating contact:
■
Closed: Fault
■
Open: No fault
■
Not suitable for safety LV
Connection values (contact rating):
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
Connection, see separate "Connection and wiring dia-
gram" sheet 21.
Note
■
No parameters need to be set.
■
The contact issues a short pulse when the power sup-
ply is switched on. Observe the pulse when processing
the message via communication tools.
Installation sequence
Overview of electrical connections
(cont.)
5549 984 GB
Installation
Summary of Contents for KWT BW 301.B090
Page 99: ...99 5549 984 GB...
