Viessmann VITOCELL 100-W - Operation with a Heat Pump in Conjunction with a Heating Lance for DHW Heating

During draw-off and once draw-off has ended, the cylinder volume is
reheated to the set temperature via the Vitotrans 222. In the fully
heated state (no draw-off), cylinder loading pump
N
and heating
circuit pump
E
in the Vitotrans 222 are switched OFF.
Provided the above set heating water and DHW temperatures are
observed, the Vitotrans 222 heat exchanger set can be operated up
to a total water hardness of 20 °dH (total of alkaline earths
3.6 mol/m
3
).
A
DHW
B
Hot water inlet from the heat exchanger
C
Vitotrans 222 heat exchanger set
D
Plate heat exchanger
E
Heating circuit pump (primary), highly efficient
F
Air vent valve
G
Heating water flow
H
Heating water return
K
Heat source with a constant flow temperature (e.g. district heat-
ing, max. 75 °C)
L
Line regulating valve
M
Non-return valve
N
Cylinder loading pump (secondary), highly efficient
O
Safety valve
P
Shared cold water connection with safety assembly to DIN 1988
R
Vitocell 100-L, (here: 500 l capacity)
S
Lower temperature controller (OFF)
T
Upper temperature controller (ON)
Operation with a heat pump in conjunction with a heating lance for DHW heating
In the cylinder loading system, loading pump M withdraws the cold
water from the bottom of DHW cylinder
O
during the cylinder heat-
ing process (no draw-off). The water is heated in plate heat
exchanger D and resupplied to the DHW cylinder via heating lance
C mounted in flange B. The generously sized outlet apertures in
the heating lance result in low flow velocities, which in turn provide a
clean temperature stratification inside the DHW cylinder.
Installation of the optional immersion heater EHE (accessories) into
the DHW cylinder flange enables DHW heating to be boosted fur-
ther.
Cylinder loading systems — Vitocell 100-L with Vitotrans 222
(cont.)
DHW heating
VIESMANN
29
5414646
5