Installation, use and maintenance guide
COMPACT S22
–S26–S32 EVO5
Page
15
ENG
5.2 GUIDELINES FOR PLANTS WITH ZONE VALVES
Legenda
Key
Elettrovalvola sempre aperta
(zona con più assorbimento)
Solenoid valve always open
(zone with the most absorption)
COLLETTORE ANDATA
DELIVERY HEADER
COLLETTORE RITORNO
RETURN HEADER
A: andata impianto riscaldamento
A: heating system delivery
R: ritorno impianto riscaldamento
R: heating system return
S: saracinesca
S: gate valve
TA: elettrovalvola
TA: solenoid valve
VNR: valvola di non ritorno
VNR: nonreturn valve
VEC: vaso di espansione chiuso per protezione
impianto
VEC: closed expansion tank for system protection
VM3VT: valvola miscelatrice termostatca 55°C
VM3VT: thermostatic mixing valve 55°C
APPARECCHIO
APPLIANCE
Over 61°C, the generator circulating pump is always active as the heat must be dispersed; consequently, the solenoid valve in the
zone with the greatest absorption must be opened for the following reasons:
• to prevent the generator from continually starting up and shutting off caused by the inevitable loss of heat to the header and/or
due to system tubing.
• to prevent the generator from raising the water temperature by just a few degrees each time it is switched off then back on until it
shuts down due to exceeding the maximum threshold temperature.
To adjust the ambient temperature in which the valve opened, we recommend connecting the room temperature thermostat to the
CHRONOTHERMOSTAT MODEM terminal that allows the machine to be shut off via an external contact and therefore also
restarted.
This ensures that the generator only activates if there is a real request for heat from the zone in which the chronothermostat is
installed.
Several parallel-connected room temperature thermostats can be installed in the CHRONOTHERMOSTAT MODEM. This will
ensure that the zone requesting heat automatically activates the generator.
In the event of frequent startups and shut offs due to the heat produced by the generator not being absorbed, the manual reset
safety thermostat trips and blocks the generator.
N.B. Use chronothermostats having at least 2°C hysterisis.
The system must always be capable of absorbing all the power that the generator is capable of delivering. If you do not observe this
requirement , the generator could be subjected to numerous stops and starts. It is recommended not to exceed three lighting cycles
per day.
VEC
TA
TA
Elettrovalvola sempre aperta
(zona con piu' assorbimento)
COLLETTORE ANDATA
COLLETTORE RITORNO
TA
S
S
VM3VT
A
R
A : andata impianto riscaldamento
R : ritorno impianto riscaldamento
S : saracinesca
VNR : valvola di non ritorno
VEC : vaso di espansione chiuso per protezione impianto
VM3VT : valvola miscelatrice termostatica 55°c.
TA : elettrovalvola
VNR
A
PP
A
RE
C
C
HI
O
schema idraulico - valvole di zona.dft 03/05/2016
