Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 99

Electrical connections
Required parameters
Function
External blocking
External mixer "CLOSED"
Central fault message
223.1
A
223.2
A Terminals on main PCB with exten-
sion
Zero volt contact in the heat pump,
open in fault-free operation (voltage
> 42 V)
Breaking capacity 230 V~; 4(2) A
Swimming pool water heating
Note
■ Swimming pool heating is controlled with KM BUS via "External extension H1".
■ Make connections to "External extension H1" only according to the following dia-
gram.
■ Connect only the circulation pump for swimming pool heating E to plug gÖ
according to the following diagram. A filter circuit pump must be connected sepa-
rately.
■ If the components for swimming pool heating are connected to "External extension
H1", no further hook-up (e.g. operating status changeover) can be connected.
(cont.)
Parameter Ó setting
"System definition"
■ "External blocking effect 701A" Ó "0" to
"31".
"System definition"
■ "External blocking mixer "CLOSED" 7015"
Ó "0" to "8" (see page 183)
Observe parameter "External blocking effect
701A".
L1
230 V~, 0.5 A
N
Installation sequence
Note
■ No parameters need to be set.
■ The contact issues a short pulse when
the power supply is switched on.
Observe the pulse when processing
the message via communication tools.
99