41
Terminals
Function
Explanation
222.3
222.4
Control of external heat
generators and 1 high limit
safety cut-out each (on site,
max. 70 °C), to switch off or
switch between the follow-
ing components:
Floating contact
Connection values (contact breaking ca-
pacity)
■ Voltage: 230 V~
(not suitable for safety LV)
■ Max. switching current: 4(2) A
Central heating:
■ Secondary pump, heat
pump
■ Secondary pump, heat
pump stage 2 (if installed)
■ External heat generator
Connections for high limit safety cut-outs
for central heating:
■ In series to the secondary pump (ter-
minal 211.2 on the main PCB)
■ In series to the secondary pump, heat
pump stage 2 (terminal 224.3)
■ In series for controlling external heat
generators (terminal 222.3)
DHW reheating:
■ Circulation pump for cyl-
inder heating
or
■ 3-way diverter valve for
"Central heating/DHW
heating"
Connections for high limit safety cut-outs
for DHW heating:
■ In series with the circulation pump for
cylinder heating or 3-way diverter valve
"Heating/DHW heating" (terminal 211.4
on main PCB)
Installation sequence
Electrical connections
(cont.)
5546 267 GB
Installation
