31
High limit safety cut-out in conjunction with exter-
nal heat generator
222.3
222.4
A
X3.1
X2.N
C
B
K1
X3.14
Fig. 18
A
High limit safety cut-out to protect the heat pump
(max. 70 °C)
B
Terminals on expansion PCB
C
Connection on external heat generator to terminals
for "External demand"
K1 Relay
■
Sizing according to the external heat generator
■
Observe safety instructions.
!
Please note
In the case of incorrect parameter setting, the
high limit safety cut-out
might not
switch off the
secondary pump
immediately
after being trig-
gered, but instead with a time delay.
Set
"Effect of external blocking on pumps/
compressor 701A"
to
"16"
(select
"bit 5"
).
!
Please note
The function of the high limit safety cut-out can
be disabled by other functions.
■
External hook-up, heating/cooling circuits:
External hook-up for heating/cooling circuits
(e.g. in conjunction with a Smart Home sys-
tem) must not be set: Do not set
"Remote
control 2003, 3003, 4003"
to
"2"
.
■
Smart Grid:
For Smart Grid, use the EA1 extension
(accessories): Set
"Enable Smart Grid 7E80"
to
"1"
.
Plug
sXD
Terminals
Function
Explanation
223.1
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
Central fault message
223.1
L1
230V~, 0.5 A
N
223.2
A
Fig. 19
A
Terminals on extension PCB
Installation sequence
Electrical connection
(cont.)
6153640
Installation
