Viessmann VITOCELL 300-W Installation Instructions And Setup Manual page 18

Connections on the DHW side
Notes on the diagrams below
■ Headers for DHW must be approved for drinking
D
water.
Install the temperature controller in the final cylinder,
■
as viewed from the heating water flow.
■ The "DHW" connection can, contrary to the dia-
grams, also be connected on the same side as the
heating water flow, and the "cold water" connection
can be implemented on the same side as the heating
water return. This ensures that every cylinder is
heated and that water is drawn off from every cylin-
der equally.
In conjunction with boilers or district heating systems without heating water return temperature limiting
facility and a DHW circulation pipe
WW
A
B
C
KW
Fig. 15
DHW circulation pipe
A
DHW circulation pump
B
Spring-loaded check valve
C
Header on the DHW side (stainless steel)
D
Header on the heating water side (steel)
E
ELV Air vent valve
EV Drain valve
In conjunction with district heating systems with a return temperature limiting facility on the heating
water side and/or in conjunction with several DHW circulation pipes
WW
A
B C
KW
Fig. 16
DHW circulation pipe
A
DHW circulation pump
B
Spring-loaded check valve
C
Header on the DHW side (stainless steel)
D
Header on the heating water side (steel)
E
ELV Air vent valve
18
(cont.)
D
Z Z
E
HV
E
HR
EV
D
D
Z Z
HV
E
E
HR
EV
D
Z
ELV
TR
HR Heating water return
HV Heating water flow
KW Cold water
WW DHW
TR Temperature controller
Z DHW circulation
Z
ELV
TR
EV Drain valve
HR Heating water return
HV Heating water flow
KW Cold water
WW DHW