Ferroli MACH Instrucciones De Uso página 320

Two mixed heating circuits, one direct heating circuit and one DHW circuit with circulating pump
- Schematic diagram
The FZ4B zone control board can manage different types of systems. An example is given.
Use diverter valves with 3 wires: OPENING PHASE 230V - CLOSING PHASE 230V - NEUTRAL, with switching times
(from fully closed to fully open) not exceeding 180 seconds
Legend (fig. 50 and fig. 51)
72a 1st zone (mixed) room thermostat
72b 2nd zone (mixed) room thermostat
72c 3rd zone (direct) room thermostat
130 Hot water tank circulating pump
138 External probe
139a 1st zone (mixed) Remote Timer Control
139b 2nd zone (mixed) Remote Timer Control
139c 3rd zone (direct) Remote Timer Control
155 Hot water tank probe
300 Anti-Legionella circulating pump
315a 1st zone (mixed) mixing valve
A = OPENING PHASE
B = NEUTRAL
C = CLOSING PHASE
315b 2nd zone (mixed) mixing valve
A = OPENING PHASE
B = NEUTRAL
C = CLOSING PHASE
317a 1st zone (mixed) safety thermostat
317b 2nd zone (mixed) safety thermostat
318a 1st zone (mixed) circulating pump
318b 2nd zone (mixed) circulating pump
318c 3rd zone (direct) circulating pump
320
fig. 50
319a 1st zone (mixed) flow sensor
319b 2nd zone (mixed) flow sensor
M
R
a
b
c
d
I*
cod. 3541V120 - Rev 00 - 09/2021
Flow
Return
1st zone (mixed)
2nd zone (mixed)
3rd zone (direct)
Hot water tank circuit)
ISPESL safety devices (When required - not su-
pplied
MACH
EN