27
Pos.
Designation
7
Only for type BW 2150, BW 2180, BW 2250 (two-stage heat pumps):
Secondary pump 2 (fail-safe)
Note
■
Contactor relay required
■
Size secondary pump 1
5
for partial load.
qT
(1st) Primary pump (fail-safe)
wT
Optional: Primary pump 2 (fail-safe) for stage 2
Note
■
Contactor relay required
■
Size primary pumps
qT
and
wT
to at least 75 % of the nominal flow rate.
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
W
30
36
35
33
34
WW
KW
32
X
37
Fig.21
W
Heat pump interface
X
Interface to the solar thermal system or the exter-
nal heat generator
KW Cold water
WW DHW
Required equipment
Pos.
Designation
eP
DHW cylinder
eW
Cylinder temperature sensor
eE
Cylinder loading pump (DHW side, fail-safe)
Preparing for installation
Heat pump cascade: 1-stage/2-stage
(cont.)
5549 984 GB
Installation
Summary of Contents for KWT BW 301.B090
Page 99: ...99 5549 984 GB...
