Preparing For Installation Hydraulic Function Diagram - Viessmann AC-Box Installation And Service Instructions For Contractors

Preparing for installation
Hydraulic function diagram
W
V
U
Fig.1
Note
■ Valve switching states without switching by the heat
pump.
Component layout inside the appliance: See
■
page 21.
Direction of flow, 3-way diverter valve
Valve open
Valve closed
2-way valve V1
A
2-way valve V2
B
2-way valve V3
C
2-way valve V7
D
2-way valve V5
E
2-way valve V6
F
3-way diverter valve V4
G
Switching states of the integral 2-way valves and circulation pumps
Active signal V1
None
NC signal
AC signal
Valve open
Valve closed
6
O
G
M
M
F
M
D
H
M
T
V2 V3
A B C
P R S
A
M
K
L
B M
N
C
M
M
E
High efficiency circulation pump M2
H
High efficiency circulation pump M1
K
Plate heat exchanger 1
L
Plate heat exchanger 2
M
Frost stat
N
AC-Box
O
P Contact humidistat 24 V
Flow, heating/cooling circuit or separate cooling
R
circuit
Return, heating/cooling circuit or separate cool-
S
ing circuit
Geothermal probe
T
Heat pump
U
DHW cylinder flow
V
DHW cylinder return
W
V5 V6
E F
ON
\
OFF
0
(accessories)
–
V7 M1 M2
D K
0
\
\
H
0
0
\