21
-
Installation & Servicing
INSTALLATION
24 EXAMPLES OF HEATING SYSTEMS CONT'D
Installation of Two Boilers in Cascade, with Mixing Header and One or more Radiator Groups
1
2
4
3
5
7
6
S
T
O
R
E
M
O
DE
R
E
S
E
T
S
TE
P
1
2
4
3
5
76
S
T
O
R
E
M
OD
E
R
E
S
E
T
ST
EP
11 12 13
11 12 13
Flow
Return
Flow
Return
Boiler pump
or storage
tank pump
non return
valve
non return
valve
Boiler pump or
storage tank
Filter
Mixing
Header
Heating circuit
Heating system
pump
ima 5782
DHW Storage Tank with DHW Pump Installed on the Secondary Circuit, in Parallel with the Heating Circuit.
1
2
4
3
5
76
S
T O
R
E
M
O
D
E
R
E
SE
T
S
T
E
P
16 17 18
11 12 13
ima 5783
Flow
Return
Filter
Primary
System
Pump
Mixing header
non return
valve
Heating circuit
Heating
system pump
DHW
pump
DHW
tank
Note.
The primary system pump would be off while the DHW pump is running with PARA A second digit set to 'x1'. This would
only give adequate circulation if the DHW pump was connected into the primary circuit, shown to the left of the mixing
header above. However, in the case shown it will be necessary to run the primary system pump with the DHW pump
for correct circulation. To achieve this set PARA A second digit to 'x0'.
INST
ALLA
TION
