40
Technical features and dimensions
3.21 - HYDRAULIC AND ELECTRIC
SYSTEM CONNECTION WITH
OPTIONAL PANEL BOARD
Fig. 35 and Fig. 36 show the typical layout of the connection of
the boiler to the heating system consisting of 2 zones one of
which is 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 = open 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 3G boiler automati-
cally switches the burner off when the temperature in the boi-
ler reaches the value set on the heating controller.
It also manages the pump to fill a storage tank for DHW pro-
duction.
Two distinct heating zones are managed automatically ba-
sed 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 re-
ached (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 sy-
stem 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. 35
DHW production can also be managed.
Remember that TRISTAR 3G boilers operate with forced cir-
culation.
CALDAIA TRISTAR 3G
ROOM PROBE 1
(FBR1)
FLOW PROBE 2
(VFAS)
STORAGE TANK
PROBE (SPFS)
BOILER PROBE
(KFS)
EXTERNAL PROBE
(AFS)
ROOM PROBE 2
(FBR1)
TRISTAR 3G BOILER
DOMESTIC HOT
WATER PRODUCER
