Main Pcb (230 V~ Components) - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Installation sequence
Electrical connections

Main PCB (230 V~ components)

Information regarding the connection values
The specified output is the recommended connected
■
load.
■ The total output of all components connected directly
to the heat pump control unit (e.g. pumps, valves,
message facilities, contactors) must not exceed
1000 W.
If the total output is < 1000 W, the individual rating of
a component (e.g. pump, valve, message facility,
contactor) can be greater than specified. However,
the breaking capacity of the relevant relay must not
be exceeded.
The specified current indicates the max. switching
■
current of the switching contact. Observe total cur-
rent of 5 A.
Plug sYA
Terminals Function
211.2 Secondary pump
1.
211.5 Cooling control
NC NC function (natural cooling)
Plug
sYS
Terminals Function
212.2 Heating circuit pump for heating cir-
cuit without mixer (A1/HC1)
A1
24
(cont.)
Set the required parameters during commissioning:
see page 43 onwards.
Explanation
No further heating circuit pump is required in systems
■
without a heating water buffer cylinder: See terminal
212.2.
Connect a temperature limiter to restrict the maximum
■
temperature for underfloor heating circuits (if instal-
led) in series.
Connection values
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Secondary pump is connected at the factory. Connect
the temperature limiter on site.
NC-Box or on-site components for natural cooling
Connection values
Output: 10 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Explanation
This pump is connected in addition to the secondary
■
pump if a heating water buffer cylinder is installed.
Connect the temperature limiter to restrict the maxi-
■
mum temperature for underfloor heating systems (if
installed) in series (see the following chapter)
Connection values
Output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■