26
xtra
-
Installation & Servicing
INSTALLATION
29 EXAMPLES OF HEATING SYSTEMS
Heating system with DHW production (storage tank Output = Boiler Output) and mixing header.
Flow
Return
Primary
System
Pump
Filter
Mixing
Header
Heating circuit
Heating
System
Pump
im8196
Storage
tank output
=
boiler output
A
B
AB
3 way diverting valve
M
N
L
N
L
Primary
System
Pump
Filter
Mixing
Header
Heating circuit
Heating
System
Pump
im8197
N
L
Flow
Return
Note.
If PARA '46' 1st digit is set to 2, it means you wish to have a 3
way valve normally open towards the CH circuit (radiator
circuits from AB to A). Upon DHW request, terminal 'L' on
'DHW PUMP OR VALVE' is energised which, through a relay,
powers the 3-way valve, thus closing port A and opening port B.
Simultaneously terminal 'L' on 'CH PUMP' is energised which,
through another relay, powers the primary system pump.
If PARA '46' 1st digit is set to 0, it means you wish to have a 3
way valve normally open towards the storage tank (DHW
circuit from AB to B). Upon CH request, terminal 'L' on 'DHW
PUMP OR VALVE' is energised which, through a relay, powers
the 3-way valve, thus closing port B and opening port A.
Simultaneously terminal 'L' on 'CH PUMP' is energised which,
through another relay, powers the primary system pump.
Heating system with one group of radiators (controlled by thermostatic valves)
DHW storage tank with DHW pump installed on the secondary circuit, in parallel with the heating circuit
im8198
Filter
Primary
System
Pump
Mixing header
non return
valve
Heating circuit
Heating
system pump
DHW
pump
DHW
tank
Flow
Return
N
L
N
L
Note.
The primary system pump would be off while the DHW pump is running with PARA '46' 1st digit set to '1x'. 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 '46' 1st digit '2x'.
INST
ALLA
TION
