80
EN
4.7
Sensors
The sensors installed have the following characteristics:
– boiler delivery, boiler return and flue gas probes NTC R25°C;
10kΩ β25°-85°C: 3435
– domestic hot water sensor NTC R25°C; 10kΩ β25°-85°C: 3435
(optional accessory)
– external 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.
4.8
Minimum water flow rate
To protect the heat exchanger from overheating, a sufficient
water flow rate must be maintained.
By observing the water flow rates shown in the table below, a
maximum ΔT of 35°C is guaranteed at the minimum heat input,
and a maximum ΔT of 25°C at maximum heat input.
The table below shows the minimum water flow rate required
for each boiler.
DESCRIPTION
ALU HE
80
116
160
200
240
280
Minimum water flow
rate
(at Qmin ΔT 35°C)
m
3
/h 0,5
0,55
0,7
1,1
1,2
1,3
Minimum water flow
rate
(at Qmax ΔT 25°C)
m
3
/h 2,7
4,1
5,5
6,9
8,2
9,6
Water flow rate ΔT 20
(at Qmax)
m
3
/h 3,3
4,8
6,7
8,4
10,1 11,8
Water flow rate ΔT 10
(at Qmax)
m
3
/h 6,7
9,7
13,4 16,8 20,2 23,7
4.9
Load losses
The graph shows the curves for the load losses of the boilers,
necessary for the correct circulation pump to be chosen.
LOAD LOSS (mbar)
0
200
240
160
120
80
40
0
2
4
6
8
10 12 14 16 18 20 22
24
280
320
116
80
160
200 240 280
FLOW RATE (m
3
/h)
Fig. 8
m
WARNINGS
– Not respecting the recommended water flow rates
could cause the appliance to malfunction.
– At first start-up it is useful to check the rotation of
the pumps' shafts.
– DO NOT operate the pumps without any water.
– The pumps chosen must have a consumption
suitable for the fuse installed on the electrical panel
(4AT).
Summary of Contents for ALU HE 116
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