Sensors; Expansion Vessel; Circulation Pump; Heat Recovery System - Sime UNIQA REVOLUTION 25 Installations-, Gebrauchs- Und Wartungsanleitung

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 sensor NTC R25°C; 10kΩ β25°-85°C: 3435
– Return probe NTC R25°C; 10kΩ β25°-85°C: 3435
– Evaporator probe NTC R25°C; 10kΩ β25°-85°C: 3435
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω
TR=80°C → R=1669Ω.
TR
0°C 1°C 2°C 3°C 4°C
0°C 27279 26135 25044 24004 23014
10°C 17959 17245 16563 15912 15289
20°C 12090 11634 11199 10781 10382
30°C 8313 8016 7731 7458 7196
40°C 5828 5630 5440 5258 5082
50°C 4161 4026 3897 3773 3653
60°C 3021 2928 2839 2753 2669
70°C 2229 2164 2101 2040 1982
80°C 1669 1622 1577 1534 1491
90°C 1266 1232 1199 1168 1137
973
100°C
5.8

Expansion vessel

The expansion vessel installed on the boilers has the following
characteristics:
Description
Total capacity
Prefilling pressure
Useful capacity
Maximum system content (*)
(*) Conditions of:
Average operating temperature 70°C (with high tempera-
ture system 80/60°C)
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the max-
imum system content (as indicated in the table) an
additional expansion vessel must be prearranged.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for each
meter increase.
5°C 6°C 7°C 8°C 9°C
22069 21168 20309 19489 18706
14694 14126 13582 13062 12565
9999 9633 9281 8945 8622
6944 6702 6470 6247 6033
4913 4751 4595 4444 4300
3538 3426 3319 3216 3116
2589 2512 2437 2365 2296
1925 1870 1817 1766 1717
1451 1411 1373 1336 1300
1108 1079 1051 1024 998
UNIQA
U/M
REVOLUTION 25
l 8,0
kPa 100
bar 1,0
l 4,0
l 90
5.9

Circulation pump

The flow-head performance curve available for the heating sys-
tem is shown in the graph below.
RESIDUAL HEAD (mbar)
500
400
300
200
100
0
0 200 400 600
5.10

Heat recovery system

Certain conditions must apply for the heat recovery system to
work. The system return temperature must be below the value
set under (PAR 46) . The combustion air temperature must be
between the value set under (PAR 06) and (PAR 07) . Once all of
these conditions have been met, the
on the display. If the > symbol is on the screen, the heat recov-
ery system is in operation; if the symbol is flashing, the boiler is
calculating the time required to start up correctly.
25
800 1000 1200 1400 1600
WATER FLOW RATE (l/h)
Fig. 12
> symbol shows or flashes
17