Viessmann Vitotronic SPS Service Instructions Manual page 64

PCBs and connection options
Main PCB
(cont.)
Connection
Digital IN X11
Digital IN X12
External connections X19
Terminals Function
X19.0 Optional heat pump emergency stop
button
X19.2 Power supply utility control
X19.4 External multi stage enabling, input 1
X19.6 External multi stage enabling, input 2
X19.8 External set value changeover
or
External operating mode changeover
64
Terminal Address Pos. no.
1 DI 0
3 DI 1
5 DI 2
7 DI 3
9 DI 4
1 DI 5
3 DI 6
5 DI 7
7 DI 8
9 DI 9
Type
A B C
1 X X X
1 X X X
1 X X X
1 X X X
1 X X X
1 X X X
1 X X
X
1 X X
X
1 X X
1 X X X
Explanation
Contact closed:
■
Heat pump running
Contact open:
■
Heat pump not running
No jumper should be installed if a flow switch is con-
nected.
Power-OFF and low tariffs
Function depends on the configuration
For complete third party control without set value:
■
External demand 1
For all other configurations:
■
Multi stage enabling, input 1 (one stage)
Function depends on the configuration
For complete third party control without set value:
■
External demand 2
For all other configurations:
■
Multi stage enabling, input 2 (2 further stages)
Function depends on the configuration
For third party control:
■
Changeover command, cooling/heating
For all other configurations:
■
Set value input changeover for cooling/heating
Contact closed: Cooling
■
Contact open: Heating
■
Explanation
Motor protection compressor 1
High pressure control, compressor 1
Safety chain, compressor 1
Motor protection compressor 2
High pressure control, compressor 2
Safety chain, compressor 2
Motor protection compressor 3
Oil level switch, compressor 1
High pressure control, compressor 3
Oil level switch, compressor 2
Safety chain, compressor 3
Low pressure, heat pump