26
■
Up to 5 lag heat pumps when connected via LON
The following communication modules (accessories)
must be fitted in the heat pump control units:
–
LON cascade communication module in the lead
heat pump
–
LON communication module in lag heat pumps
Hydraulic installation scheme
qT wT
1
2
W
P
H
C
5
7
qT wT
1
2
5
7
1
2
5
7
1
2
5
3
7
qT wT
qT wT
6
6
6
6
IV
4
III
4
II
4
I
4
A
Q
Fig.20
A
Interface to heating water buffer cylinder
(return)
C
Interface to the separate cooling circuit or heat-
ing/cooling circuit
H
Interface to heating water buffer cylinder (flow)
P
Interface to primary circuit (flow)
Q
Interface to primary circuit (return)
W
Interface to the DHW cylinder
I
Lead heat pump in the heat pump cascade
(single or two-stage)
II to IV Lag heat pumps in the heat pump cascade
(each either single or two-stage)
Equipment required
Pos.
Designation
Heat generator
1
Heat pumps
2
Heat pump control unit
3
Outside temperature sensor
4
LON communication module for cascade control of the lead heat pump I
LON communication module for lag heat pumps II to IV
5
(1st) Secondary pump (fail-safe)
6
Circulation pump for cylinder heating (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...
