44
Installation instructions
VM2
Ps
PRODUTTORE ACQUA
CALDA SANITARIA
Pi2
Pb
IR2
VFAS
SPFS
VE
Pr
Pi1
IR1
2
3
4
5
6
7
1
8
9
10
2
3
4
5
1
IV
II
1
N
L1
L1
'
1
1
1
2
2
2
M
M
2
T1
T2
4
3
2
1
3
2
1
2
1
2
1
4
3
2
1
8
7
6
5
10
9
2
1
V
II
I
V
V
III
III
IX
+
-
L
3
B
us
H
1
FB
R
1
V
FA
S
V
FA
S
A
FS
VF
A
S
3
1
FB
R
1
D
CF
1
2
3
2
1
V
I
1
2
T3
T4
KFS
CALDAIA TRISTAR 2S
3.20 - HYDRAULIC AND ELECTRIC SYSTEM
CONNECTION WITH OPTIONAL PANEL
BOARD
Fig. 44 and 45 show the typical layout of the connection of the
boiler to the heating system consisting of 2 zones one of which
controlled by a motorised mixer valve.
Key:
Pr =
recirculation pump
VM2 = zone mixer valve
Pi1 = direct zone heating system pump
Pi2 = mixed zone heating system pump
VE = expansion vessel
IR1 = direct zone heating system distribution
IR2 = mixed zone heating system distribution
Ps = domestic water recirculation pump
Pb = DHW production charge pump
SPFS = storage tank probe
KFS = boiler probe
VFAS = flow probe 2
The optional panel board of the TRISTAR 2S boiler automatically
switches the burner off when the temperature in the boiler
reaches the value set on the heating controller.
It also manages the pump to fill a storage tank for DHW
production.
Two distinct heating zones are managed automatically based
on the data detected by the boiler, external, ambient and flow
probes.
The main system pump (mixed zone) will only be activated when
the minimum boiler temperature of 50°C has been reached (anti-
condensation protection temperature).
The pump will switch off when the lower threshold of 50°C
(decreasing) is reached.
The panel is set up to manage dual-stage or modulating burners.
With this layout configuration, the DHW storage tank loading
pump will have the priority over the heating system pump.
The heating controller is capable of controlling various system
configurations:
- one direct zone system without mixer valve: the flow probe
must not be mounted; the control unit only commands the
system pump 1.
- one zone system with motorised mixer valve: the flow probe
(downstream the mixer valve) must be fitted; the control unit
commands the system pump 2 and the mixer valve 2.
- system with 2 zones: one direct and one with mixer valve; the
control unit controls: the system pump of the direct zone 1,
the mixer valve 2 and the system pump 2 of the mixed zone.
fig. 44
DHW production can also be managed.
Remember that TRISTAR 2S boilers operate with forced
circulation.
ROOM PROBE 1 (FBR1)
FLOW PROBE 2 (VFAS)
STORAGE TANK PROBE (SPFS)
BOILER PROBE (KFS)
EXTERNAL PROBE (AFS)
ROOM PROBE 2 (FBR1)
TRISTAR 2S BOILER
DOMESTIC HOT WATER
PRODUCER