Version 4 - Cylinder Loading System With Several Vitocell 100-L Connected In Series And Vitotrans 222 For Modulating Flow Temperatures - Viessmann Vitocell 300-H Technical Manual

Installation — cylinder loading system
Version 4 — cylinder loading system with several Vitocell 100-L connected in series and Vitotrans 222 for
modulating flow temperatures
D
B
C
O
P
A
N
A Vitocell 100-L, (here: 500 l capacity)
B DHW circulation pipe
C DHW circulation pump
D Draw-off points (DHW)
E Vitotrans 222 heat exchanger set with mixer assembly
F Vitotronic 200-H, type HK1B, HK3B
Vitotronic 100, type CC1I, CC1E
Vitotronic 200, type CO1I, CO1E
Vitotronic 300, type CM1I, CM1E
Vitotronic 300-K, type MW1B, MW2B
Note
■ Establish cold water connection N with a tee with straight flow to
the cold water connection of the Vitocell 100-L. Always make the
cold water connection to the Vitotrans 222 as a tee branch.
■ In order to ensure fault-free heating operation, the residual head of
cylinder loading pump L must be greater than that of DHW circu-
lation pump C, giving due consideration to the pipework pressure
drop.
Connect in series if relatively continuous DHW demand can be
expected, e.g. in large apartment buildings.
*13 Control unit has no output sK for control of a DHW circulation pump.
DHW heating
(cont.)
A A
*13
28
5 A
5 B
21 17 B
L
Q
G
G Plate heat exchanger
H Heating water flow
K Heating water return
L Cylinder loading pump (secondary), highly efficient
N Shared cold water connection with safety assembly to DIN 1988
O Spring-loaded check valve
P Cylinder temperature sensor, top
(ON, terminals %A)
Q Cylinder temperature sensor, bottom
(OFF, terminals %B)
Note the max. draw-off rate when sizing for DHW heating. According
to DIN 1988, the max. flow velocity should not be higher than 2 m/s
(affects stratification inside the DHW cylinder).
The benefits of connection in series are particularly evident when
heat exchangers with low output ratings are combined with large cyl-
inder capacities, as a large cylinder capacity makes it possible to
use smaller boilers or the input of district heating.
Due to the necessary high flow temperatures of the heat source,
never use a directly connected heating circuit without mixer.
For optimum operation, disable the DHW cylinder priority at the con-
trol unit.
F
A1 A1
52 20
H
K
M
E
VIESMANN
7
47