20
DESCRIPTION
MURELLE.HT
25
30
35
NOZZLES - GAS
Number of nozzles
No.
2
2
2
Nozzle diameter (G20-G31)
mm
3,3 / 2,6 - 2,6 / 1,9
3,4 / 3,2 - 2,9 / 2,2
4,0 / 3,5 - 3,0 / 2,8
Gas consumption at Max/Min flow rate (G20)
m
3
/h
2,59 / 0,185
3,12 / 0,22
3,65 / 0,26
Gas consumption at Max/Min flow rate (G31)
kg/h
1,90 / 0,27
2,29 / 0,33
2,68 / 0,47
Gas supply pressure (G20/G31)
mbar
20 / 37
20 / 37
20 / 37
kPa
2 / 3,7
2 / 3,7
2 / 3,7
TEMPERATURE - PRESSURE
Max operating temperature (T max)
°C
85
Heating adjustment range
°C
20÷80
Domestic hot water adjustment range
°C
10÷60
Max operating pressure (PMS)
bar
3
kPa
300
Water content in boiler
l
4,9
5,5
6,0
(*)
NOx class according to UNI EN 15502-1:2021
(**)
Heat input calculated using the lower heat output (Hi)
Lower Heat Output (Hi)
G20 Hi.
9.45 kW/m
3
(15°C, 1013 mbar) -
G31 Hi.
12.87 kW/kg (15°C, 1013 mbar)
5.6
Main water circuit
3
5
6
14
13
15
16
18
19
10
9
8
11
17
21
20
12
7
M
U
G
E
R
Sc
S
4
2
1
Fig. 27
KEY:
M
System delivery
R
System return
U
Domestic hot water outlet
E
Domesti hot water inlet
S
Safety valve outlet
G
Gas supply
Sc
Condensate outlet
1
Condensing heat exchanger
2
Combustion chamber
3
Fan
4
Return sensor (SR)
5
Thermal safety thermostat
6
Delivery sensor
7
Domestic hot water heat exchanger
8
Pressure transducer
9
Automatic bleed valve
10
Pump
11
System expansion vessel
12
Diverter valve
13
Automatic by-pass
14
Domestic hot water sensor
15
Gas valve
16
Domestic hot water flow meter
17
Domestic hot water filter
18
Boiler drain
19
System relief valve
20
System filling
21
Condensate siphon outlet
5.7
Sensors
The sensors installed have the following characteristics:
– Dual sensor (thermal safety/output) NTC R25°C; 10kΩ β25°-
85°C: 3435
– domestic hot water sensor NTC R25°C; 10kΩ β25°-85°C: 3435
– External temperature sensor NTC R25°C; 10kΩ β25°-85°C:
3435
TR
0°C 1°C 2°C 3°C 4°C 5°C 6°C 7°C 8°C 9°C
Resistance R (Ω)
0°C
27279
17959
12090
8313
5828
4161
3021
2229
1669
1266
973
26135
17245
11634
8016
5630
4026
2928
2164
1622
1232
25044
16563
11199
7731
5440
3897
2839
2101
1577
1199
24004
15912
10781
7458
5258
3773
2753
2040
1534
1168
23014
15289
10382
7196
5082
3653
2669
1982
1491
1137
22069
14694
9999
6944
4913
3538
2589
1925
1451
1108
21168
14126
9633
6702
4751
3426
2512
1870
1411
1079
20309
13582
9281
6470
4595
3319
2437
1817
1373
1051
19489
13062
8945
6247
4444
3216
2365
1766
1336
1024
18706
12565
8622
6033
4300
3116
2296
1717
1300
998
10°C
20°C
30°C
40°C
50°C
60°C
70°C
80°C
90°C
100°C
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.
Summary of Contents for 8115101
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