Unical NOVAIREX Series, Installation And Maintenance Instructions Manual

Page: 34 / 56

34
3.12.4 - NOVAIREX BOILER SYSTEM FOR HEATING AND FOR THE PRODUCTION OF
DOMESTIC HOT WATER WITH TANK IN TANK STORAGE TANK AND BACK-UP BOILER (oil-fired)
Mors. 6 p. VERDE Mors. 9 p. GRIGIO
RMV
P2
S5
S4
A
B
AB
Pg
N
N
J4
P3 P2
ALIMENTAZIONE
CALDAIA DI
SOCCORSO
Esempio di collegamento elettrico
su caldaia di soccorso con pannello
strumenti cod.21057
E
E
L1 T2 N S3 T1 B4
L1 N
IG
11
41
32
12
31
230V~ 50Hz
2
1
3
4
4-
4
24 22
21
C
2
G-
V
6-6 7-7 8-
8
9-9 10-10
Ts
7 6 9 5 8 10
B
A
11
12
Ib
(60°÷90°C)
(100°C)
Te 1
F1 (max 4 A)
N
Ph
R
F
F
SF
VE
IR
P3
S2
Micr
o por
ta TA S5 SF S3 S2 S4
Morsett. 7 poli colore VERDE Morsett. 9 poli colore GRIGIO
Key:
IR : heating system
Pg
: back-up boiler loading pump
P2
: loading/recirculation pump
P3 : system pump
RMV : mixing valve (55°C)
SF : flue gas probe
In the following configuration when the wood-fired boiler runs
out of loaded wood, if the automatic function has been selected
on the control board and
TA is in demand, clean contact J3 11-
12 on the wood-fired control board closes. In this way pump Pg
is powered and the back-up boiler burner switches on.
The burner switches off either because
TA
requirement is met
(in this case pump Pg also stops), or because the temperature
set in the operating thermostat of the back-up boiler has been
reached (in this case pump
Pg does not stop).
In the event of wood-fired boiler over-temperature, during back-
up boiler operation, when the temperature in
S4
reaches the
value of parameter P1, pump P2 starts and some of the energy
in the boiler is discharged into the puffer.
If the temperature in
S4 should further increase until reaching
the temperature value set in parameter P2, both the burner of
the back-up boiler and pump
P4
switch off, the system pump
P3 switches on and an audible alarm will signal the overtem-
perature.
In case of a demand for DHW, clean contact J3 11-12 on the
wood-fired boiler's control board closes, the burner of the back-
up boiler switches on and pump Pg starts.
The request occurs when the temperature in
S3 reaches the
temperature set in P5 and ends when S2 reaches the tempera-
ture set in P6; the burner switches off and pump Pg stops.
The counter-exchange between probe
S4
and probe
S2
is con-
trolled by the wood-fired boiler.
S2
: storage tank temperature sensor (low point)
S3 : storage tank temperature sensor (high point)
S4 : flow temperature sensor of the boiler
S5 : return temperature sensor of the boiler
VE
: expansion vessel
BACK-UP BOIL-
ER SUPPLY
Example of electrical connection
on back-up boiler with panel board
code 21057
STORAGE EX-
CHANGER
Door micros
witch