Dhw Heating (Type Bw 302.D090 To Bw 302.D230) - Viessmann Vitocal 300-G Pro Series Installation And Service Instructions For Contractors

Preparing for installation
Hydraulic connection requirements
Pos. Description
Only for type BW 302.D140, BW 302.D180 and BW 302.D230 (2-stage heat pumps):
7
Secondary pump 2 (fail-safe)
Note
Contactor relay required
■
Size secondary pump 1
■
Primary pump 1 (fail-safe)
qT
Optionally: 2nd primary pump (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 31 and separate "Connection and wiring dia-
gram".

DHW heating (type BW 302.D090 to BW 302.D230)

Hydraulic installation scheme
WW
37
32
X
33
30
KW
Fig. 14
Heat pump interface
W
Interface to the solar thermal system or the exter-
X
nal heat generator
Required equipment
Pos. Description
DHW cylinder
eP
Cylinder temperature sensor
eW
eE Cylinder loading pump (on the DHW side, fail-safe)
20
(cont.)
5 for partial load.
and to at least 75 % each of the nominal flow rate.
qT wT
36
35
W
34
KW Cold water
WW DHW