Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 32

Installation sequence
Electrical connection
Plug
sXF
Terminals Function
224.6
Cylinder loading pump (DHW side)
2-way shut-off valve
M
224.7
Circulation pump for DHW reheating
or
Control of immersion heater
Immersion heater EHE 400 V~
224.7
B
X2.N
A
Fig. 20
Immersion heater EHE, power supply 3/N/PE
A
400 V/50 Hz
Terminals of the heat pump control unit
B
32
(cont.)
L1 L2 L3 N
?
Explanation
Connect cylinder loading pump and 2-way shut-off
valve in parallel.
Supply values
Output: 130 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Supply values
Output: 100 W
■
Voltage: 230 V~
■
Max. switching current: 4(2) A
■
Immersion heater 230 V~ (on site)
224.7
B
X2.N
A
Fig. 21
Immersion heater, power supply 1/N/PE
A
230 V/50 Hz
Terminals of the heat pump control unit
B
L1 L1 L1 N N N
?