Dhw Heating; Type Bw 301.B090 To Bw 302.B250 And Ww 301.B125 To Ww 302.B300 - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Heat pump cascade: 1-stage/2-stage
Pos. Designation
Only for type BW 2150, BW 2180, BW 2250 (two-stage heat pumps):
7
Secondary pump 2 (fail-safe)
Note
Contactor relay required
■
Size secondary pump 1
■
(1st) Primary pump (fail-safe)
qT
Optional: Primary pump 2 (fail-safe) for stage 2
wT
Note
Contactor relay required
■
Size primary pumps
■
Electrical installation scheme
For a summary of electrical connections, see from
page 37 and separate "Connection and wiring dia-
gram".

DHW heating

Type BW 301.B090 to BW 302.B250 and WW 301.B125 to WW 302.B300

Hydraulic installation scheme
WW
37
36
32
X
33
30
KW
Fig.21
Heat pump interface
W
Interface to the solar thermal system or the exter-
X
nal heat generator
Required equipment
Pos. Designation
DHW cylinder
eP
Cylinder temperature sensor
eW
Cylinder loading pump (DHW side, fail-safe)
eE
(cont.)
5 for partial load.
and to at least 75 % of the nominal flow rate.
qT wT
35
W
34
KW Cold water
WW DHW
Preparing for installation
27