Vitocal 222-A
N
O
M
L
H
K
P
O
K R S K N P
K
C
B
A
G
D
E
F
A
Expansion vessel, suitable for drinking water
B
Visible discharge pipe outlet point (tundish)
C
Safety valve
D
DHW circulation pump
E
Spring-loaded check valve
F
Automatic thermostatic mixing valve
G
DHW
H
Heat pump terminal area (plan view)
K
Shut-off valve
L
Flow regulating valve
M
Pressure gauge connection
N
Non-return valve/pipe separator
O
Drain valve
P
Cold water
R
Drinking water filter
S
Pressure reducer DIN 1988-200:2012-05
Safety valve
The DHW cylinder must have a safety valve to protect against
unduly high pressure.
Recommendation: Install safety valve above top edge of cylinder.
This means the DHW cylinder will not need to be drained when
working on the safety valve.
CH: According to W3 "Principles for creating potable water installa-
tions", safety valves must be drained directly via a visible unrestric-
ted drain or via a short outlet line to the drain network.
Automatic thermostatic mixing valve
With appliances that heat DHW to temperatures above 60 °C, an
automatic thermostatic mixing valve must be installed in the DHW
line as protection against scalding.
This also particularly applies when connecting solar thermal sys-
tems.
7.12 DHW cylinder selection
When selecting the DHW cylinder ensure that its indirect coil surface
area is large enough for the purpose.
Approximate calculation of the coil surface area:
Minimum indirect coil surface area in m
2
≈ heat pump output in
kW x 0.3 m
2
/kW
Max. cylinder storage temperature
■ Vitocal 200-A: 50 °C
Note
■ The stated cylinder storage temperature can only be achieved in
the temperature range within the application limits to EN 14511 in
which the heat pump reaches the max. flow temperature.
■ The cylinder sizes listed in the following table are standard val-
ues. They are based on the following DHW demand: 50 l per per-
son per day at a DHW temperature of 45 °C
Design information
(cont.)
124
VIESMANN
VITOCAL
7
5831388
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