Operation With A Heat Pump In Conjunction With A Heating Lance For Dhw Heating - Viessmann Vitocell 300-H Technical Manual

Cylinder loading systems — Vitocell 100-L with Vitotrans 222
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.
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)

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.
DHW heating
(cont.)
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 ).
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)
Installation of the optional immersion heater EHE (accessories) into
the DHW cylinder flange enables DHW heating to be boosted fur-
ther.
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