ICI Caldaie REX User manual

TECHNICAL MANUAL
REX/REX F/REX K/REX K F
REX DUAL/REX DUAL F
STR
PRESSURISED STEEL BOILERS

1
INDEX
1GENERAL WARNINGS .............................................................................................................................................. 1
2TECHNICAL SPECIFICATIONS................................................................................................................................. 2
2.1 REX/REX F/REX K/REX K F 7-130 BOILER....................................................................................................... 2
2.2 REX/REX F/REX K/REX K F 140-500 BOILER................................................................................................... 4
2.3 REX 400-600 BOILER......................................................................................................................................... 5
2.4 REX DUAL/REX DUAL F (staked) 14-170 BOILER ............................................................................................ 6
2.5 REX DUAL/REX DUAL F (side by side) 80-260 BOILER .................................................................................... 8
2.6 STR BOILER..................................................................................................................................................... 10
3INSTALLATION ........................................................................................................................................................ 11
3.1 THERMAL PLANT............................................................................................................................................. 11
3.1.1 BOILER ROOM ......................................................................................................................................... 11
3.1.2 FLUE ......................................................................................................................................................... 11
3.2 HYDRAULIC CONNECTION............................................................................................................................. 12
3.2.1 Hot water heating system with closed expansion vessel - Furnace output ≤300.000 kcal/h - pressure 5 bar .. 12
3.2.2 Hot water heating system with closed expansion vessel - Furnace output > 300,000 kcal/h - pressure 5 bar .. 12
3.2.3 REX DUAL/REX DUAL F (side by side) 80÷260 positioning instruments .................................................. 13
3.3 ELECTRICAL CONNECTION ........................................................................................................................... 14
3.4 REX/REX F/REX K/REX K F/STR CONTROL PANEL ..................................................................................... 14
3.5 REX DUAL/REX DUAL F OPERATING PRINCIPLES ...................................................................................... 15
3.5.1 REX DUAL/REX DUAL F control panel ..................................................................................................... 15
3.6 INVERTING THE DOOR APERTURE .............................................................................................................. 16
3.7 BURNER CONNECTION .................................................................................................................................. 16
4ASSEMBLY .............................................................................................................................................................. 17
4.1 REX K/REX K F ASSEMBLY ............................................................................................................................ 17
4.2 REX/REX F/REX K/REX K F 7-40 BOILER CASINGS .....................................................................................19
4.3 REX/REX F/REX K/REX K F 50-130 BOILER CASINGS.................................................................................. 20
4.4 REX DUAL/REX DUAL F 14-70 BOILER CASINGS ......................................................................................... 21
4.5 STR BOILER CASINGS.................................................................................................................................... 22
5START UP ................................................................................................................................................................ 23
5.1 PRELIMINARY CHECKS .................................................................................................................................. 23
5.2 WATER TREATMENT ...................................................................................................................................... 23
5.3 FILLING THE SYSTEM..................................................................................................................................... 23
6OPERATION............................................................................................................................................................. 24
6.1 OPERATING CHECKS ..................................................................................................................................... 24
6.2 CLEANING AND SERVICING........................................................................................................................... 25
1 GENERAL WARNINGS
Each generator is provided with a manufacture plate that can be found in the envelope with the boiler
documents. The plate lists:
•Serial number or identification code;
•Rated thermal output in kcal/h and in kW;
•Furnace thermal output in kcal/h and in kW;
•Types of fuels that can be used;
•Max operating pressure.
A manufacture certificate is also provided which certifies the hydraulic test positive performance.
The installation must be performed in compliance with the regulations in force by professionally qualified
personnel. The term “professionally qualified personnel” means persons with specific technical skills in the
sector of heating system components.
Incorrect installation may cause damage to persons, animals or objects for which the manufacturer cannot be held
responsible.
At the first start up, all regulation and control devices positioned on the control panel should be checked for
efficiency. The guarantee shall be valid only upon compliance with the instruction given in this manual.
Our boilers have been built and tested in observance of EEC requirements and, as a consequence, CE-marked. EEC di-
rectives are as follows:
•Directive on Gas 90/396/EEC
•Directive on Output 92/42/EEC
•Directive on Electromagnetic Compatibility 89/336/EEC
•Directive on Low Voltage 73/23/EEC
IMPORTANT: This boiler has been designed to heat hot water at a temperature inferior to the boiling tem-
perature at atmospheric pressure and must be connected to a heating plant and/or a domestic hot water
plant within the limits of its performance and output.

2
2 TECHNICAL SPECIFICATIONS
2.1 REX/REX F/REX K/REX K F 7-130 BOILER
Efficiency 100%
(N.C.V.)
Effic. 100%
(stars)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at 30%
(N.C.V.)
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
(Efficienty Dir.
92/42/CEE)
Medium Temp.
70°C
REX 7 REX K 7 70 60.000 76 65.360 92,11 **
8,04 5,97 5,90 119,80 35 30.000 38,3 32.930 91,40 4,05 3,01 2,97 60,37
REX 8 REX K 8 80 69.000 87 74.820 91,95 **
9,21 6,83 6,76 137,23 40 34.000 43,7 37.600 91,50 4,63 3,43 3,40 68,94
REX 9 REX K 9 90 77.000 98 84.280 91,84
**
10,37 7,70 7,61 154,51 45 39.000 49,2 42.270 91,55 5,20 3,86 3,82 77,50
REX 10 REX K 10 100 86.000 109 93.740 91,74 **
11,53 8,56 8,47 171,80 50 43.000 54,5 46.910 91,66 5,77 4,28 4,24 86,00
REX 12 REX K 12 120 103.000 130 111.800 92,31 **
13,76 10,21 10,10 205,02 60 52.000 65,6 56.420 91,45 6,94 5,15 5,10 103,44
REX 15 REX K 15 150 129.000 163 140.180 92,02 **
17,25 12,80 12,66 257,03 75 65.000 82,1 70.650 91,30 8,69 6,45 6,38 129,53
REX 20 REX K 20 200 172.000 216 185.760 92,59 **
22,86 16,96 16,78 340,61 100 86.000 109,5 94.130 91,36 11,58 8,60 8,50 172,58
REX 25 REX K 25 250 215.000 271 233.060 92,25
**
28,68 21,28 21,05 427,33 125 108.000 136,3 117.230 91,70 14,42 10,71 10,59 214,93
REX 30 REX K 30 300 258.000 325 279.500 92,31 **
34,39 25,53 25,25 512,41 150 129.000 163,2 140.370 91,90 17,27 12,82 12,68 257,35
REX 35 REX K 35 350 301.000 379 325.940 92,35 **
40,11 29,77 29,44 597,64 175 151.000 190,4 163.760 91,90 20,15 14,96 14,79 300,24
REX 40 REX K 40 400 344.000 433 372.380 92,38 **
45,82 34,01 33,64 682,72 200 172.000 217,9 187.360 91,80 23,05 17,11 16,93 343,50
REX 50 REX K 50 500 430.000 542 466.120 92,25 -
57,35 42,57 42,11 854,52 250 215.000 272,0 233.950 91,90 28,79 21,37 21,13 428,92
REX 62 REX K 62 620 533.000 672 577.920 92,26
-
71,11 52,78 52,21 1059,54 310 267.000 337,7 290.410 91,80 35,73 26,52 26,23 532,44
REX 75 REX K 75 750 645.000 813 699.180 92,25 -
86,03 63,85 63,16 1281,85 375 323.000 408,5 351.310 91,80 43,23 32,08 31,74 644,09
REX 85 REX K 85 850 731.000 921 792.060 92,29 -
97,46 72,33 71,55 1452,15 425 366.000 463,0 398.150 91,80 48,99 36,36 35,97 729,97
REX 95 REX K 95 950 817.000 1030 885.800 92,23 -
108,99 80,89 80,02 1623,95 475 409.000 518,0 445.470 91,70 54,81 40,68 40,24 816,72
REX 100 REX K 100 1020 877.000 1106 951.160 92,22 -
117,04 86,86 85,92 1743,90 510 439.000 555,0 477.260 91,90 58,73 43,59 43,11 875,01
REX 120 REX K 120 1200 1.032.000 1301 1.118.860 92,24
-
137,67 102,18 101,07 2051,28 600 516.000 653,6 562.090 91,80 69,16 51,33 50,78 1030,53
REX 130 REX K 130 1300 1.118.000 1409 1.211.740 92,26 -
149,10 110,66 109,46 2221,59 650 559.000 708,8 609.600 91,70 75,01 55,67 55,07 1117,64
Minimum
input
Characteristics
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner off
Press. losses
water side
Design
Pressure
Total
ca
p
acit
y
Total
wei
g
ht
Electric
su
pp
l
y
Freque
nc
y
Insulation
class
Electric
p
ower
mbar % % % °C °C °C % % % mbar ba
r
lkg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY OIL
(∆T=12°C)
With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX 7 REX K 7
0,8 7,09 0,80 0,10 188 191 191 10,5 13,5 14,0 95105216
230 50 IP X0D 20 XXXX -
REX 8 REX K 8
1,0 7,25 0,80 0,10 192 195 194 10,5 13,5 14,0 95105216
230 50 IP X0D 20 XXXX -
REX 9 REX K 9
0,8 7,36 0,80 0,10 194 197 197 10,5 13,5 14,0 10 5 123 258 230 50 IP X0D 20 XXXX -
REX 10 REX K 10
1,0 7,46 0,80 0,10 197 199 199 10,5 13,5 14,0 12 5 123 258 230 50 IP X0D 20 XXXX -
REX 12 REX K 12
1,1 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 13 5 123 258 230 50 IP X0D 20 XXXX -
REX 15 REX K 15
1,2 7,18 0,80 0,10 190 193 193 10,5 13,5 14,0 14 5 172 346 230 50 IP X0D 20 XXXX -
REX 20 REX K 20
1,9 6,61 0,80 0,10 177 180 180 10,5 13,5 14,0 15 5 172 346 230 50 IP X0D 20 XXXX -
REX 25 REX K 25
2,0 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 15 5 220 431 230 50 IP X0D 20 XXXX -
REX 30 REX K 30
2,0 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 16 5 300 475 230 50 IP X0D 20 XXXX -
REX 35 REX K 35
2,9 6,85 0,80 0,10 183 186 185 10,5 13,5 14,0 18 5 356 542 230 50 IP X0D 20 XXXX -
REX 40 REX K 40
4,1 6,82 0,80 0,10 182 185 184 10,5 13,5 14,0 20 5 360 584 230 50 IP X0D 20 XXXX -
REX 50 REX K 50
4,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 22 5 540 853 230 50 IP X0D 20 XXXX -
REX 62 REX K 62
6,4 6,94 0,80 0,10 185 188 187 10,5 13,5 14,0 27 5 645 963 230 50 IP X0D 20 XXXX -
REX 75 REX K 75
5,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 25 5 855 1205 230 50 IP X0D 20 XXXX -
REX 85 REX K 85
7,2 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 27 5 855 1205 230 50 IP X0D 20 XXXX -
REX 95 REX K 95
5,2 6,97 0,80 0,10 185 188 188 10,5 13,5 14,0 32 5 950 1417 230 50 IP X0D 20 XXXX -
REX 100 REX K 100
4,0 6,98 0,80 0,10 186 189 188 10,5 13,5 14,0 26 5 1200 1843 230 50 IP X0D 20 XXXX -
REX 120 REX K 120
5,5 6,96 0,80 0,10 185 188 188 10,5 13,5 14,0 30 5 1200 1843 230 50 IP X0D 20 XXXX -
REX 130 REX K 130
6,5 6,94 0,80 0,10 185 188 187 10,5 13,5 14,0 32 5 1200 1843 230 50 IP X0D 20 XXXX -
Flue gas temp. at boiler
output and air at 20 deg. CO2 Fuel
Characteristics
Efficiency 100%
(
N.C.V.
)
Effic. 100%
(
stars
)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at 30%
(
N.C.V.
)
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % % m³/h kg/h kg/h kg/h k
W
kcal/h kW kcal/h % m³/h k
g
/h k
g
/h k
g
/h
Medium Temp.
70°C
(Efficienty Dir.
92/42/CEE
)
Medium Temp.
70°C
REX 7 F REX K 7 F 70 60.000 74,2 63.812 94,34 ***
7,85 5,83 5,76 116,97 35 30.000 36,9 31.750 94,80 3,91 2,90 2,87 58,21
REX 8 F REX K 8 F 80 69.000 84,7 72.842 94,45 ***
8,96 6,65 6,58 133,50 40 34.000 42,2 36.330 94,70 4,47 3,32 3,28 66,61
REX 9 F REX K 9 F 90 77.000 95,2 81.872 94,54 ***
10,07 7,48 7,40 150,04 45 39.000 47,4 40.740 95,00 5,01 3,72 3,68 74,69
REX 10 F REX K 10 F 100 86.000 105,6 90.816 94,70 ***
11,17 8,29 8,20 166,43 50 43.000 52,7 45.360 94,80 5,58 4,14 4,10 83,16
REX 12 F REX K 12 F
120 103.000 126,5 108.790 94,86
***
13,39 9,94 9,83 199,51 60 52.000 63,1 54.260 95,10 6,68 4,96 4,90 99,48
REX 15 F REX K 15 F 150 129.000 157,8 135.708 95,06 ***
16,70 12,39 12,26 248,83 75 65.000 78,4 67.400 95,70 8,29 6,16 6,09 123,57
REX 20 F REX K 20 F
200 172.000 210 180.600 95,24
***
22,22 16,49 16,31 331,08 100 86.000 104,9 90.240 95,30 11,10 8,24 8,15 165,45
REX 25 F REX K 25 F 250 215.000 263,5 226.610 94,88 ***
27,88 20,69 20,47 415,41 125 108.000 131,1 112.710 95,38 13,87 10,29 10,18 206,64
REX 30 F REX K 30 F 300 258.000 315,5 271.330 95,09 ***
33,39 24,78 24,51 497,51 150 129.000 156,9 134.950 95,59 16,61 12,32 12,19 247,42
REX 35 F REX K 35 F 350 301.000 367 315.620 95,37 ***
38,84 28,82 28,51 578,72 175 151.000 183,1 157.430 95,60 19,37 14,38 14,22 288,63
REX 40 F REX K 40 F 400 344.000 420 361.200 95,24 ***
44,44 32,99 32,63 662,16 200 172.000 209,6 180.290 95,40 22,18 16,46 16,29 330,54
REX 50 F REX K 50 F
500 430.000 524 450.640 95,42
-
55,45 41,15 40,71 826,21 250 215.000 261,2 224.660 95,70 27,64 20,52 20,29 411,89
REX 62 F REX K 62 F 620 533.000 649 558.140 95,53 -
68,68 50,97 50,42 1023,33 310 267.000 323,3 278.000 95,90 34,21 25,39 25,11 509,68
REX 75 F REX K 75 F
750 645.000 786 675.960 95,42
-
83,17 61,73 61,06 1239,23 375 323.000 391,0 336.220 95,92 41,37 30,71 30,37 616,42
REX 85 F REX K 85 F 850 731.000 891 766.260 95,40 -
94,29 69,98 69,22 1404,92 425 366.000 443,6 381.520 95,80 46,94 34,84 34,46 699,48
REX 95 F REX K 95 F 950 817.000 997 857.420 95,29 -
105,50 78,30 77,45 1571,95 475 409.000 495,9 426.450 95,79 52,47 38,95 38,52 781,85
REX 100 F REX K 100 F 1020 877.000 1069 919.340 95,42 -
113,12 83,96 83,05 1685,49 510 439.000 532,4 457.830 95,80 56,33 41,81 41,36 839,38
REX 120 F REX K 120 F 1200 1.032.000 1259 1.082.740 95,31 -
133,23 98,88 97,81 1985,13 600 516.000 626,2 538.570 95,81 66,27 49,18 48,65 987,41
REX 130 F REX K 130 F 1300 1.118.000 1364 1.173.040 95,31 -
144,34 107,13 105,97 2150,67 650 559.000 679,2 584.120 95,70 71,87 53,34 52,77 1070,92
Characteristics
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Minimum
input

3
Pressure losses
flue gas side
Heat losses through
the chimney
Heat losses through
the casing
Heat losses with
burner off
Flue gas temp. at boile
r
output and air at 20 deg. C CO2 Press. losses water side
Design
Pressure
Total
capacity
Total
weight
Electric
supply
Freque
ncy
Insulation
class
Electric
power
mbar % % % °C % mbar bar l kg Volt ~ Hz IP W
GAS GAS (∆T=12°C)
With electr.
contr. (excluded
pump and burner)
N a t. g as Lpg Gasoil Heavy oil Wood
REX 7 F REX K 7 F 0,9 5,16 0,50 0,10 148 11,0 9 5 105 222 230 50 IP X0D 20 XX---
REX 8 F REX K 8 F 1,1 5,05 0,50 0,10 146 11,0 9 5 105 222 230 50 IP X0D 20 XX---
REX 9 F REX K 9 F 0,9 4,96 0,50 0,10 143 11,0 10 5 123 266 230 50 IP X0D 20 XX---
REX 10 F REX K 10 F 1,1 4,80 0,50 0,10 140 11,0 12 5 123 266 230 50 IP X0D 20 XX---
REX 12 F REX K 12 F 1,3 4,64 0,50 0,10 136 11,0 13 5 123 266 230 50 IP X0D 20 XX---
REX 15 F REX K 15 F 1,3 4,44 0,50 0,10 131 11,0 14 5 172 357 230 50 IP X0D 20 XX---
REX 20 F REX K 20 F 2,2 4,26 0,50 0,10 127 11,0 15 5 172 357 230 50 IP X0D 20 XX---
REX 25 F REX K 25 F 2,4 4,62 0,50 0,10 135 11,0 15 5 220 442 230 50 IP X0D 20 XX---
REX 30 F REX K 30 F 2,4 4,41 0,50 0,10 130 11,0 16 5 300 489 230 50 IP X0D 20 XX---
REX 35 F REX K 35 F 3,4 4,13 0,50 0,10 124 11,0 18 5 356 558 230 50 IP X0D 20 XX---
REX 40 F REX K 40 F 4,7 4,26 0,50 0,10 127 11,0 20 5 360 600 230 50 IP X0D 20 XX---
REX 50 F REX K 50 F 4,8 4,08 0,50 0,10 122 11,0 22 5 540 871 230 50 IP X0D 20 XX---
REX 62 F REX K 62 F 7,3 3,97 0,50 0,10 120 11,0 27 5 645 981 230 50 IP X0D 20 XX---
REX 75 F REX K 75 F 5,8 4,08 0,50 0,10 122 11,0 25 5 855 1230 230 50 IP X0D 20 XX---
REX 85 F REX K 85 F 8,0 4,10 0,50 0,10 123 11,0 27 5 855 1230 230 50 IP X0D 20 XX---
REX 95 F REX K 95 F 5,9 4,21 0,50 0,10 126 11,0 32 5 950 1446 230 50 IP X0D 20 XX---
REX 100 F REX K 100 F 4,5 4,08 0,50 0,10 122 11,0 26 5 1200 1880 230 50 IP X0D 20 XX---
REX 120 F REX K 120 F 6,2 4,19 0,50 0,10 125 11,0 30 5 1200 1880 230 50 IP X0D 20 XX---
REX 130 F REX K 130 F 7,3 4,19 0,50 0,10 125 11,0 32 5 1200 1880 230 50 IP X0D 20 XX---
Fuel
Characteristics
H
H1 H2 H4 H6 H10
L
L2
P
P2 P3 P4 P5 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
REX 7 REX K 7 REX 7 F REX K 7 F
1063 853 415 912 415 54,5 756 700 994 630 413 240 341 200-250 130 200 50 50 1" 1" - 1/2" 1/2"
REX 8 REX K 8 REX 8 F REX K 8 F
1063 853 415 912 415 54,5 756 700 994 630 413 240 341 200-250 130 200 50 50 1" 1" - 1/2" 1/2"
REX 9 REX K 9 REX 9 F REX K 9 F
1030 855 415 912 415 54,5 756 700 1119 755 513 265 341 200-250 130 200 50 50 1" 1" - 1/2" 1/2"
REX 10 REX K 10 REX 10 F REX K 10 F
1030 855 415 912 415 54,5 756 700 1119 755 513 265 341 200-250 130 200 50 50 1" 1" - 1/2" 1/2"
REX 12 REX K 12 REX 12 F REX K 12 F
1030 855 415 912 415 54,5 756 700 1119 755 513 265 341 200-250 130 200 50 50 1" 1" - 1/2" 1/2"
REX 15 REX K 15 REX 15 F REX K 15 F
1080 905 440 962 440 54,5 806 750 1364 1000 513 475 376 200-250 160 250 50 50 1" 1" - 1/2" 1/2"
REX 20 REX K 20 REX 20 F REX K 20 F
1080 905 440 962 440 54,5 806 750 1364 1000 513 475 376 200-250 160 250 50 50 1" 1" - 1/2" 1/2"
REX 25 REX K 25 REX 25 F REX K 25 F
1080 905 440 962 440 54,5 806 750 1614 1250 513 725 376 200-250 160 250 50 50 1" 1" - 1/2" 1/2"
REX 30 REX K 30 REX 30 F REX K 30 F
1180 1005 490 1061 490 54,5 906 850 1614 1250 523 700 391 200-250 180 250 65 65 1" 1" - 1/2" 1/2"
REX 35 REX K 35 REX 35 F REX K 35 F
1180 1005 490 1061 490 54,5 906 850 1864 1500 523 980 361 200-250 180 250 65 65 1" 1" - 1/2" 1/2"
REX 40 REX K 40 REX 40 F REX K 40 F
1190 1015 500 1095 500 50 946 890 1872 1502 600 850 422 230-280 225 250 80 80 1" 1" 1"1/4(1) 1/2" 1/2"
REX 50 REX K 50 REX 50 F REX K 50 F
1380 1205 610 1285 610 60 1166 1110 1946 1502 663 850 433 270-320 225 300 80 80 1" 1"1/4 1"1/4 1/2" 1/2"
REX 62 REX K 62 REX 62 F REX K 62 F
1380 1205 610 1285 610 60 1166 1110 2235 1792 663 1150 422 270-320 225 300 80 80 1" 1"1/4 1"1/4 1/2" 1/2"
REX 75 REX K 75 REX 75 F REX K 75 F
1510 1335 675 1417 675 60 1296 1240 2247 1753 704 1100 443 270-320 280 350 100 100 1" 1"1/4 1"1/2 1/2" 1/2"
REX 85 REX K 85 REX 85 F REX K 85 F
1510 1335 675 1417 675 60 1296 1240 2247 1753 704 1100 443 270-320 280 350 100 100 1" 1"1/4 1"1/2 1/2" 1/2"
REX 95 REX K 95 REX 95 F REX K 95 F
1510 1335 675 1417 675 60 1296 1240 2497 2003 704 1200 593 270-320 280 350 100 100 1" 1"1/4 1"1/2 1/2" 1/2"
REX 100 REX K 100 REX 100 F REX K 100 F
1660 1485 750 1568 750 60 1446 1390 2477 2003 703 1200 574 270-320 280 400 125 125 1" 1"1/4 1"1/2 1/2" 1/2"
REX 120 REX K 120 REX 120 F REX K 120 F
1660 1485 750 1568 750 60 1446 1390 2477 2003 703 1200 574 270-320 280 400 125 125 1" 1"1/4 1"1/2 1/2" 1/2"
REX 130 REX K 130 REX 130 F REX K 130 F
1660 1485 750 1568 750 60 1446 1390 2477 2003 703 1200 574 270-320 280 400 125 125 1" 1"1/4 1"1/2 1/2" 1/2"
Dimensions
(1) One fitting only
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well

4
2.2 REX/REX F/REX K/REX K F 140-500 BOILER
Efficiency 100%
(
N.C.V.
)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
Medium Temp.
70°C
REX 140 REX K 140
1400 1.204.000 1517 1.304.620 92,29 160,53 119,14 117,85 2391,90 700 602.000 763,4 656.490 91,70 80,78 59,95 59,30 1203,61
REX 160 REX K 160
1600 1.376.000 1733 1.490.380 92,33 183,39 136,11 134,63 2732,51 800 688.000 871,5 749.460 91,80 92,22 68,44 67,70 1374,06
REX 180 REX K 180
1800 1.548.000 1950 1.677.000 92,31 206,35 153,15 151,49 3074,62 900 774.000 980,4 843.140 91,80 103,75 77,00 76,16 1545,81
REX 200 REX K 200
2000 1.720.000 2167 1.863.620 92,29 229,31 170,19 168,35 3416,72 1000 860.000 1.090,5 937.840 91,70 115,40 85,65 84,72 1719,43
REX 240 REX K 240
2400 2.064.000 2600 2.236.000 92,31 275,13 204,20 201,99 4099,44 1200 1.032.000 1.307,2 1.124.180 91,80 138,33 102,66 101,55 2061,07
REX 300 REX K 300
3000 2.580.000 3250 2.795.000 92,31 343,92 255,25 252,48 5124,41 1500 1.290.000 1.634,0 1.405.230 91,80 172,91 128,33 126,94 2576,34
REX 350 REX K 350
3500 3.010.000 3792 3.261.120 92,3 401,27 297,82 294,59 5978,92 1750 1.505.000 1.908,4 1.641.220 91,70 201,95 149,88 148,26 3009,00
Minimum
input
Characteristics
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner off
Press. losses
water side
Design
Pressure
Total
capacit
y
Total
wei
g
ht
Electric
suppl
y
Freque
nc
y
Insulation
class
Electric
power
mbar % % % °C °C °C % % % mbar bar l kg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY
OIL
(∆T=12°C)
With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX 140 REX K 140
6,0 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 28 5 1500 2600 230 50 IP X0D 20 X X X X -
REX 160 REX K 160
6,5 6,87 0,80 0,10 183 186 186 10,5 13,5 14,0 32 5 1500 2600 230 50 IP X0D 20 X X X X -
REX 180 REX K 180
7,0 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 37 5 1650 2750 230 50 IP X0D 20 X X X X -
REX 200 REX K 200
6,0 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 35 5 2000 3650 230 50 IP X0D 20 X X X X -
REX 240 REX K 240
7,5 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 40 5 2300 3900 230 50 IP X0D 20 X X X X -
REX 300 REX K 300
8,0 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 49 5 3150 5200 230 50 IP X0D 20 X X X X -
REX 350 REX K 350
9,0 6,90 0,80 0,10 184 187 186 10,5 13,5 14,0 60 5 3650 5700 230 50 IP X0D 20 X X X X -
Flue gas temp. at boiler
output and air at 20 deg. CO2 Fuel
Characteristics
Efficiency 100%
(
N.C.V.
)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
Medium Temp.
70°C
REX 140 F REX K 140 F
1400 1.204.000 1468 1.262.480 95,37 155,34 115,29 114,05 2314,57 700 602.000 730,2 627.930 95,87 77,26 57,35 56,72 1151,24
REX 160 F REX K 160 F
1600 1.376.000 1675 1.440.500 95,52 177,25 131,55 130,13 2641,03 800 688.000 835,1 718.160 95,80 88,37 65,59 64,87 1316,67
REX 180 F REX K 180 F
1800 1.548.000 1885 1.621.100 95,49 199,47 148,05 146,44 2972,10 900 774.000 940,4 808.780 95,70 99,52 73,86 73,06 1482,81
REX 200 F REX K 200 F
2000 1.720.000 2094 1.800.840 95,51 221,59 164,46 162,68 3301,69 1000 860.000 1.043,8 897.700 95,80 110,46 81,98 81,09 1645,84
REX 240 F REX K 240 F
2400 2.064.000 2518 2.165.480 95,31 266,46 197,76 195,62 3970,25 1200 1.032.000 1.257,9 1.081.760 95,40 133,11 98,79 97,72 1983,29
REX 300 F REX K 300 F
3000 2.580.000 3142 2.702.120 95,48 332,49 246,77 244,09 4954,10 1500 1.290.000 1.569,0 1.349.370 95,60 166,04 123,23 121,89 2473,93
REX 350 F REX K 350 F
3500 3.010.000 3670 3.156.200 95,37 388,36 288,24 285,11 5786,56 1750 1.505.000 1.825,4 1.569.830 95,87 193,16 143,36 141,81 2878,12
Minimum
input
Characteristics
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner of
f
Flue gas temp. at boiler
output and air at 20 de
g
. C CO2 Press. losses water side
Design
Pressure
Total
capacit
y
Total
wei
g
ht
Electric
suppl
y
Freque
nc
y
Insulation
class
Electric
power
mbar % % % °C % mbar bar l kg Volt ~ Hz IP W
GAS GAS (∆T=12°C)
With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX 140 F REX K 140 F
6,6 4,13 0,50 0,10 124 11,0 28 5 1500 2665 230 50 IP X0D 20 X X - - -
REX 160 F REX K 160 F
7,1 3,98 0,50 0,10 120 11,0 32 5 1500 2665 230 50 IP X0D 20 X X - - -
REX 180 F REX K 180 F
7,6 4,01 0,50 0,10 121 11,0 37 5 1650 2815 230 50 IP X0D 20 X X - - -
REX 200 F REX K 200 F
6,6 3,99 0,50 0,10 120 11,0 35 5 2000 3730 230 50 IP X0D 20 X X - - -
REX 240 F REX K 240 F
8,1 4,19 0,50 0,10 125 11,0 40 5 2300 3980 230 50 IP X0D 20 X X - - -
REX 300 F REX K 300 F
8,6 4,02 0,50 0,10 121 11,0 49 5 3150 5300 230 50 IP X0D 20 X X - - -
REX 350 F REX K 350 F
9,6 4,13 0,50 0,10 124 11,0 60 5 3650 5800 230 50 IP X0D 20 X X - - -
Fuel
Characteristics
HH1 H2 H6 H10 LL2 PP2 P3 P4 P5 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
REX 140 REX K 140 REX 140 F REX K 140 F 1746 1630 880 880 150 1470 1270 2886 2300 831 1300 755 350-400 320 400 150 150 1" 1"1/4 1"1/2 1/2" 1/2"
REX 160 REX K 160 REX 160 F REX K 160 F 1746 1630 880 880 150 1470 1270 2886 2300 831 1300 755 350-400 320 400 150 150 1" 1"1/4 1"1/2 1/2" 1/2"
REX 180 REX K 180 REX 180 F REX K 180 F 1746 1630 880 880 150 1470 1270 3096 2510 771 1850 475 450-500 320 400 150 150 1" 1"1/4 1"1/2 1/2" 1/2"
REX 200 REX K 200 REX 200 F REX K 200 F 1876 1760 945 945 150 1600 1400 3220 2510 903 1550 767 450-500 360 500 200 200 1" 1"1/4 2" 1/2" 1/2"
REX 240 REX K 240 REX 240 F REX K 240 F 1876 1760 945 945 150 1600 1400 3480 2770 903 1950 627 450-500 360 500 200 200 1" 1"1/4 2" 1/2" 1/2"
REX 300 REX K 300 REX 300 F REX K 300 F 2146 2030 1080 1080 150 1870 1670 3480 2770 903 2050 527 450-500 400 550 200 200 1" 1"1/4 2" 1/2" 1/2"
REX 350 REX K 350 REX 350 F REX K 350 F 2146 2030 1080 1080 150 1870 1670 3935 3225 903 2050 982 450-500 400 550 200 200 1" 1"1/4 2" 1/2" 1/2"
Dimensions
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well

5
2.3 REX 400-600 BOILER
Characteristics
Efficienc
y
100%
(N.C.V.)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficienc
y
at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % m³/h k
g
/h k
g
/h k
g
/h kW kcal/h kW kcal/h % m³/h k
g
/h k
g
/h k
g
/h
Medium Temp.
70°C
Medium Temp.
70°C
REX 400
4000 3.440.000 4333 3.726.380 92,31 458,52 340,31 336,62 6831,95 2000 1.720.000 2.178,6 1.873.640 91,80 230,55 171,11 169,25 3435,12
REX 450
4500 3.870.000 4865 4.183.900 92,5 514,81 382,09 377,95 7670,67 2250 1.935.000 2.448,3 2.105.550 91,90 259,08 192,29 190,20 3860,30
REX 500
5000 4.300.000 5402 4.645.720 92,56 571,64 424,27 419,67 8517,44 2500 2.150.000 2.720,3 2.339.500 91,90 287,87 213,65 211,34 4289,23
REX 600
6000 5.160.000 6480 5.572.800 92,59 685,71 508,93 503,41 10217,08 3000 2.580.000 3.264,4 2.807.400 91,90 345,44 256,38 253,60 5147,07
Minimum
input
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Characteristics Pressure losses
flue gas side
Heat losses through
the chimney
Heat losses through
the casing
Heat losses with
burner off
Press. losses
water side
Design
Pressure
Total
capacity
Total
weight
Electric
supply
Freque
ncy
Insulation
class
Electric
powe
r
mbar % % % °C °C °C % % % mbar bar l kg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY
OIL
(∆T=12°C)
With electr.
contr. (excluded
pump and burner)
N a t. g a s Lpg Gasoil H eavy oil
W ood
REX 400 9,0 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 60 6 4450 7420 230 50 IP X0D 20 XXXX -
REX 450 10,0 6,70 0,80 0,10 179 182 182 10,5 13,5 14,0 52 6 4900 7920 230 50 IP X0D 20 XXXX -
REX 500 10,0 6,64 0,80 0,10 178 181 180 10,5 13,5 14,0 58 6 6200 9530 230 50 IP X0D 20 XXXX -
REX 600 12,0 6,61 0,80 0,10 177 180 180 10,5 13,5 14,0 62 6 6900 11330 230 50 IP X0D 20 XXXX -
Flue gas temp. at boile
r
output and air at 20 deg. CO2 Fuel
Dimensions H H1 H2 H6 H10 LL2 PP2 P3 P4 P5 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
REX 400 2326 2140 1135 1135 150 1980 1780 4310 3596 1105 2200 1005 450-500 400 600 200 200 50 1"1/4 50 1/2"-3/4" 1/2"
REX 450 2326 2140 1135 1135 150 1980 1780 4660 3946 1105 2550 1005 500-550 400 600 200 200 50 1"1/4 50 1/2"-3/4" 1/2"
REX 500 2529 2340 1235 1235 150 2180 1980 4729 3948 1174 2550 1005 500-550 450 650 250 250 65 1"1/4 65 1/2"-3/4" 1/2"
REX 600 2529 2340 1235 1235 150 2180 1980 5261 4488 1174 3100 987 530-580 450 650 250 250 65 1"1/4 65 1/2"-3/4" 1/2"
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well

6
2.4 REX DUAL/REX DUAL F (staked) 14-170 BOILER
Characteristics
Efficiency 100%
(N.C.V.)
Effic. 100%
(stars)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
(Efficienty Dir.
92/42/CEE
)
Medium Temp.
70°C
REX DUAL 14
140 120.000 152 130.720 92,11
**
16,08 11,94 11,81 239,59 35 30.000 38,3 32.930 91,40 4,05 3,01 2,97 60,37
REX DUAL 16 160 138.000 174 149.640 91,95
**
18,41 13,67 13,52 274,31 40 34.000 43,7 37.600 91,50 4,63 3,43 3,40 68,94
REX DUAL 18 180 155.000 196 168.560 91,84
**
20,74 15,39 15,23 309,03 45 39.000 49,2 42.270 91,55 5,20 3,86 3,82 77,50
REX DUAL 20
200 172.000 218 187.480 91,74
**
23,07 17,12 16,94 343,74 50 43.000 54,5 46.910 91,66 5,77 4,28 4,24 86,00
REX DUAL 24 240 206.000 260 223.600 92,31
**
27,51 20,42 20,20 409,90 60 52.000 65,6 56.420 91,45 6,94 5,15 5,10 103,44
REX DUAL 30
300 258.000 326 280.360 92,02
**
34,50 25,60 25,33 514,05 75 65.000 82,1 70.650 91,30 8,69 6,45 6,38 129,53
REX DUAL 40 400 344.000 432 371.520 92,59
**
45,71 33,93 33,56 681,08 100 86.000 109,5 94.130 91,36 11,58 8,60 8,50 172,58
REX DUAL 50 500 430.000 542 466.120 92,25
-
57,35 42,57 42,11 854,52 125 108.000 136,3 117.230 91,70 14,42 10,71 10,59 214,93
REX DUAL 60
600 516.000 650 559.000 92,31
-
68,78 51,05 50,50 1024,82 150 129.000 163,2 140.370 91,90 17,27 12,82 12,68 257,35
REX DUAL 70
700 602.000 758 651.880 92,35
-
80,21 59,53 58,89 1195,13 175 151.000 190,4 163.760 91,90 20,15 14,96 14,79 300,24
REX DUAL 80
800 688.000 866 744.760 92,38
-
91,64 68,01 67,28 1365,44 200 172.000 217,9 187.360 91,80 23,05 17,11 16,93 343,50
REX DUAL 100 1000 860.000 1084 932.240 92,25
-
114,71 85,14 84,21 1709,18 250 215.000 272,0 233.950 91,90 28,79 21,37 21,13 428,92
REX DUAL 124 1240 1.066.000 1344 1.155.840 92,26
-
142,22 105,56 104,41 2119,08 310 267.000 337,7 290.410 91,80 35,73 26,52 26,23 532,44
REX DUAL 150
1500 1.290.000 1626 1.398.360 92,25
-
172,06 127,70 126,32 2563,69 375 323.000 408,5 351.310 91,80 43,23 32,08 31,74 644,09
REX DUAL 170 1700 1.462.000 1842 1.584.120 92,29
-
194,92 144,67 143,10 2904,31 425 366.000 463,0 398.150 91,80 48,99 36,36 35,97 729,97
Heat output Furnace output
Medium Temp.
70°C
Minimum
input
Minimum
output
Medium Temp.
70°C
Characteristics
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner off
Press. losses
water side
Design
Pressure
Total
ca
p
acit
y
Total
wei
g
ht
Electric
su
pp
l
y
Freque
nc
y
Insulation
class
Electric
p
owe
r
mbar % % % °C °C °C % % % mbar bar l kg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY OIL
(∆T=12°C)
With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX DUAL 14 0,8 7,09 0,80 0,10 188 191 191 10,5 13,5 14,0 11 5 210 442 230 50 IP X0D 20 XXXX -
REX DUAL 16
1,0 7,25 0,80 0,10 192 195 194 10,5 13,5 14,0 11 5 210 442 230 50 IP X0D 20 XXXX -
REX DUAL 18
0,8 7,36 0,80 0,10 194 197 197 10,5 13,5 14,0 12 5 246 536 230 50 IP X0D 20 XXXX -
REX DUAL 20
1,0 7,46 0,80 0,10 197 199 199 10,5 13,5 14,0 14 5 246 536 230 50 IP X0D 20 XXXX -
REX DUAL 24 1,1 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 15 5 246 536 230 50 IP X0D 20 XXXX -
REX DUAL 30 1,2 7,18 0,80 0,10 190 193 193 10,5 13,5 14,0 16 5 344 776 230 50 IP X0D 20 XXXX -
REX DUAL 40 1,9 6,61 0,80 0,10 177 180 180 10,5 13,5 14,0 17 5 344 776 230 50 IP X0D 20 XXXX -
REX DUAL 50
2,0 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 17 5 440 882 230 50 IP X0D 20 XXXX -
REX DUAL 60
2,0 6,89 0,80 0,10 184 186 186 10,5 13,5 14,0 18 5 600 969 230 50 IP X0D 20 XXXX -
REX DUAL 70 2,9 6,85 0,80 0,10 183 186 185 10,5 13,5 14,0 20 5 712 1114 230 50 IP X0D 20 XXXX -
REX DUAL 80 4,1 6,82 0,80 0,10 182 185 184 10,5 13,5 14,0 20 5 720 1167 230 50 IP X0D 20 XXXX -
REX DUAL 100 4,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 22 5 1080 1705 230 50 IP X0D 20 XXXX -
REX DUAL 124 6,4 6,94 0,80 0,10 185 188 187 10,5 13,5 14,0 27 5 1290 1925 230 50 IP X0D 20 XXXX -
REX DUAL 150
5,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 25 5 1710 2409 230 50 IP X0D 20 XXXX -
REX DUAL 170
7,2 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 27 5 1710 2409 230 50 IP X0D 20 XXXX -
Flue gas temp. at boile
r
output and air at 20 deg. CO2 Fuel
Characteristics Efficiency 100%
(N.C.V.)
Effic. 100%
(stars)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
(Efficienty Dir.
92/42/CEE
)
Medium Temp.
70°C
REX DUAL 14 F 140 120.000 148 127.624 94,34 *** 15,70 11,66 11,53 233,93 35 30.000 36,9 31.750 94,80 3,91 2,90 2,87 58,21
REX DUAL 16 F 160 138.000 169 145.684 94,45 *** 17,93 13,30 13,16 267,16 40 34.000 42,2 36.330 94,70 4,47 3,32 3,28 66,61
REX DUAL 18 F 180 155.000 190 163.744 94,54 *** 20,15 14,95 14,79 300,24 45 39.000 47,4 40.740 95,00 5,01 3,72 3,68 74,69
REX DUAL 20 F 200 172.000 211 181.632 94,70 *** 22,35 16,59 16,41 333,02 50 43.000 52,7 45.360 94,80 5,58 4,14 4,10 83,16
REX DUAL 24 F 240 206.000 253 217.580 94,86 *** 26,77 19,87 19,65 398,87 60 52.000 63,1 54.260 95,10 6,68 4,96 4,90 99,48
REX DUAL 30 F 300 258.000 316 271.416 95,06 *** 33,40 24,79 24,52 497,66 75 65.000 78,4 67.400 95,70 8,29 6,16 6,09 123,57
REX DUAL 40 F 400 344.000 420 361.200 95,24 *** 44,44 32,99 32,63 662,16 100 86.000 104,9 90.240 95,30 11,10 8,24 8,15 165,45
REX DUAL 50 F 500 430.000 527 453.220 94,88 -55,77 41,39 40,94 830,97 125 108.000 131,1 112.710 95,38 13,87 10,29 10,18 206,64
REX DUAL 60 F 600 516.000 631 542.660 95,09 -66,77 49,56 49,02 994,87 150 129.000 156,9 134.950 95,59 16,61 12,32 12,19 247,42
REX DUAL 70 F 700 602.000 734 631.240 95,37 -77,67 57,65 57,02 1157,28 175 151.000 183,1 157.430 95,60 19,37 14,38 14,22 288,63
REX DUAL 80 F 800 688.000 840 722.400 95,24 -88,89 65,97 65,26 1324,46 200 172.000 209,6 180.290 95,40 22,18 16,46 16,29 330,54
REX DUAL 100 F 1000 860.000 1048 901.280 95,42 -110,90 82,31 81,42 1652,41 250 215.000 261,2 224.660 95,70 27,64 20,52 20,29 411,89
REX DUAL 124 F 1240 1.066.000 1298 1.116.280 95,53 -137,35 101,94 100,84 2046,52 310 267.000 323,3 278.000 95,90 34,21 25,39 25,11 509,68
REX DUAL 150 F 1500 1.290.000 1572 1.351.920 95,42 -166,35 123,46 122,12 2478,62 375 323.000 391,0 336.220 95,92 41,37 30,71 30,37 616,42
REX DUAL 170 F 1700 1.462.000 1782 1.532.520 95,40 -188,57 139,96 138,44 2809,69 425 366.000 443,6 381.520 95,80 46,94 34,84 34,46 699,48
Minimum
input
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Characteristics
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner of
f
Flue gas temp. at boiler
out
p
ut and air at 20 de
g
. C CO2 Press. losses water side
Design
Pressure
Total
ca
p
acit
y
Total
wei
g
ht
Electric
su
pp
l
y
Freque
nc
y
Insulation
class
Electric
p
ower
mbar % % % °C % mbar bar l kg Volt ~ Hz IP W
GAS GAS (∆T=12°C)
With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX DUAL 14 F
0,9 5,16 0,50 0,10 148 11,0 11 5 210 442 230 50 IP X0D 20 X X - - -
REX DUAL 16 F
1,1 5,05 0,50 0,10 146 11,0 11 5 210 442 230 50 IP X0D 20 X X - - -
REX DUAL 18 F
0,9 4,96 0,50 0,10 143 11,0 12 5 246 536 230 50 IP X0D 20 X X - - -
REX DUAL 20 F
1,1 4,80 0,50 0,10 140 11,0 14 5 246 536 230 50 IP X0D 20 X X - - -
REX DUAL 24 F
1,3 4,64 0,50 0,10 136 11,0 15 5 246 536 230 50 IP X0D 20 X X - - -
REX DUAL 30 F
1,3 4,44 0,50 0,10 131 11,0 16 5 344 776 230 50 IP X0D 20 X X - - -
REX DUAL 40 F
2,2 4,26 0,50 0,10 127 11,0 17 5 344 776 230 50 IP X0D 20 X X - - -
REX DUAL 50 F
2,4 4,62 0,50 0,10 135 11,0 17 5 440 882 230 50 IP X0D 20 X X - - -
REX DUAL 60 F
2,4 4,41 0,50 0,10 130 11,0 18 5 600 969 230 50 IP X0D 20 X X - - -
REX DUAL 70 F
3,4 4,13 0,50 0,10 124 11,0 20 5 712 1114 230 50 IP X0D 20 X X - - -
REX DUAL 80 F
4,7 4,26 0,50 0,10 127 11,0 20 5 720 1167 230 50 IP X0D 20 X X - - -
REX DUAL 100 F
4,8 4,08 0,50 0,10 122 11,0 22 5 1080 1705 230 50 IP X0D 20 X X - - -
REX DUAL 124 F
7,3 3,97 0,50 0,10 120 11,0 27 5 1290 1925 230 50 IP X0D 20 X X - - -
REX DUAL 150 F
5,8 4,08 0,50 0,10 122 11,0 25 5 1710 2409 230 50 IP X0D 20 X X - - -
REX DUAL 170 F
8,0 4,10 0,50 0,10 123 11,0 27 5 1710 2409 230 50 IP X0D 20 X X - - -
Fuel

7
HH1 H2 H3 H4 H6 H7 H8 H10 H11 LL1 L2 L4 PP2 P3 P4 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
REX DUAL 14 REX DUAL 14 F 1693 - 415 1245 1610 415 1245 780 54,5 884,5 939 756 700 540 1365 630 996 369 200-250 130 200 65 65 1" 1" 1" 1/2" 1/2"
REX DUAL 16 REX DUAL 16 F 1693 - 415 1245 1610 415 1245 780 54,5 884,5 939 756 700 540 1365 630 996 369 200-250 130 200 65 65 1" 1" 1" 1/2" 1/2"
REX DUAL 18 REX DUAL 18 F 1693 - 415 1245 1610 415 1245 780 54,5 884,5 939 756 700 540 1490 755 1121 369 200-250 130 200 65 65 1" 1" 1" 1/2" 1/2"
REX DUAL 20 REX DUAL 20 F 1693 - 415 1245 1610 415 1245 780 54,5 884,5 939 756 700 540 1490 755 1121 369 200-250 130 200 65 65 1" 1" 1" 1/2" 1/2"
REX DUAL 24 REX DUAL 24 F 1693 - 415 1245 1610 415 1245 780 54,5 884,5 939 756 700 540 1490 755 1121 369 200-250 130 200 65 65 1" 1" 1" 1/2" 1/2"
REX DUAL 30 REX DUAL 30 F 1793 - 440 1320 1710 440 1320 830 54,5 934,5 989 806 750 590 1798 1000 1400 398 200-250 160 250 80 80 1" 1" 1" 1/2" 1/2"
REX DUAL 40 REX DUAL 40 F 1793 - 440 1320 1710 440 1320 830 54,5 934,5 989 806 750 590 1798 1000 1400 398 200-250 160 250 80 80 1" 1" 1" 1/2" 1/2"
REX DUAL 50 REX DUAL 50 F 1793 - 440 1320 1710 440 1320 830 54,5 1034,5 989 806 750 590 2048 1250 1650 398 200-250 160 250 80 80 1" 1" 1" 1/2" 1/2"
REX DUAL 60 REX DUAL 60 F 1993 - 490 1470 1910 490 1470 930 54,5 1034,5 1089 906 850 690 2049 1250 1651 398 200-250 180 250 80 80 1" 1" 1" 1/2" 1/2"
REX DUAL 70 REX DUAL 70 F 1993 - 490 1470 1910 490 1470 930 54,5 1034,5 1089 906 850 690 2299 1500 1901 398 200-250 180 250 80 80 1" 1" 1" 1/2" 1/2"
REX DUAL 80 REX DUAL 80 F 2244 2040 500 1525 2139 500 1525 1069 50 1075 1129 946 890 720 2440 1502 1795 645 230-280 225 250 100 100 1" 1"
1
"1/4(1)+1"1/2(2 1/2" 1/2"
REX DUAL 100 REX DUAL 100 F 2624 2420 610 1825 2520 610 1825 1259 60 1275 1349 1166 1110 900 2490 1502 1847 643 270-320 225 300 100 100 1" 1"1/4 1"1/4+1"1/2(2) 1/2" 1/2"
REX DUAL 124 REX DUAL 124 F 2640 2420 610 1825 2520 610 1825 1259 60 1275 1349 1166 1110 900 2792 1792 2113 679 270-320 225 300 125 125 1" 1"1/4 1"1/4+1"1/2(2) 1/2" 1/2"
REX DUAL 150 REX DUAL 150 F 2935 2680 675 2020 2793 675 2020 1372 60 1405 1479 1296 1240 1000 2756 1753 2087 668 270-320 280 350 150 150 1" 1"1/4 1"1/2+1"1/2(2) 1/2" 1/2"
REX DUAL 170 REX DUAL 170 F 2935 2680 675 2020 2793 675 2020 1372 60 1405 1479 1296 1240 1000 2756 1753 2087 668 270-320 280 350 150 150 1" 1"1/4 1"1/2+1"1/2(2) 1/2" 1/2"
Dimensions
(1) One fitting only
Mod 14-70
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well
Mod. 80-170

8
2.5 REX DUAL/REX DUAL F (side by side) 80-260 BOILER
Characteristics Efficiency 100%
(N.C.V.)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
Medium Temp.
70°C
REX DUAL 80 800 688.000 866 744.760 92,38 91,64 68,01 67,28 1365,44 200 172.000 217,9 187.360 91,80 23,05 17,11 16,93 343,50
REX DUAL 100 1000 860.000 1084 932.240 92,25 114,71 85,14 84,21 1709,18 250 215.000 272,0 233.950 91,90 28,79 21,37 21,13 428,92
REX DUAL 124 1240 1.066.000 1344 1.155.840 92,26 142,22 105,56 104,41 2119,08 310 267.000 337,7 290.410 91,80 35,73 26,52 26,23 532,44
REX DUAL 150 1500 1.290.000 1626 1.398.360 92,25 172,06 127,70 126,32 2563,69 375 323.000 408,5 351.310 91,80 43,23 32,08 31,74 644,09
REX DUAL 170 1700 1.462.000 1842 1.584.120 92,29 194,92 144,67 143,10 2904,31 425 366.000 463,0 398.150 91,80 48,99 36,36 35,97 729,97
REX DUAL 190 1900 1.634.000 2060 1.771.600 92,23 217,99 161,79 160,04 3248,05 475 409.000 518,0 445.470 91,70 54,81 40,68 40,24 816,72
REX DUAL 200 2040 1.754.000 2212 1.902.320 92,22 234,07 173,73 171,84 3487,64 510 439.000 556,2 478.300 91,70 58,85 43,68 43,21 876,91
REX DUAL 240 2400 2.064.000 2602 2.237.720 92,24 275,34 204,36 202,14 4102,57 600 516.000 653,6 562.090 91,80 69,16 51,33 50,78 1030,53
REX DUAL 260 2600 2.236.000 2818 2.423.480 92,26 298,20 221,32 218,92 4443,18 650 559.000 708,8 609.600 91,70 75,01 55,67 55,07 1117,64
Minimum
input
Minimum
output
Medium Temp.
70°C
Heat output Furnace output
Medium Temp.
70°C
Characteristics
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner off
Press. losses
water side
Design
Pressure
Total
ca
p
acit
y
Total
wei
g
ht
Electric
su
pp
l
y
Freque
nc
y
Insulation
class
Electric
p
owe
r
mbar % % % °C °C °C % % % mbar bar l kg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY OIL
(∆T=12°C)
With electr.
contr. (excluded
pump and burner)
N at. g a s Lpg Gasoil Heavy oil W ood
REX DUAL 80
4,1 6,82 0,80 0,10 182 185 184 10,5 13,5 14,0 20 5 720 1167 230 50 IP X0D 20 XXXX -
REX DUAL 100
4,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 22 5 1080 1705 230 50 IP X0D 20 XXXX -
REX DUAL 124
6,4 6,94 0,80 0,10 185 188 187 10,5 13,5 14,0 27 5 1290 1925 230 50 IP X0D 20 XXXX -
REX DUAL 150
5,2 6,95 0,80 0,10 185 188 187 10,5 13,5 14,0 25 5 1710 2409 230 50 IP X0D 20 XXXX -
REX DUAL 170
7,2 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 27 5 1710 2409 230 50 IP X0D 20 XXXX -
REX DUAL 190
5,2 6,97 0,80 0,10 185 188 188 10,5 13,5 14,0 32 5 1900 2833 230 50 IP X0D 20 XXXX -
REX DUAL 200
4,0 6,98 0,80 0,10 186 189 188 10,5 13,5 14,0 26 5 2400 3686 230 50 IP X0D 20 XXXX -
REX DUAL 240
5,5 6,96 0,80 0,10 185 188 188 10,5 13,5 14,0 30 5 2400 3686 230 50 IP X0D 20 XXXX -
REX DUAL 260
6,5 6,94 0,80 0,10 185 188 187 10,5 13,5 14,0 32 5 2400 3686 230 50 IP X0D 20 XXXX -
Flue gas temp. at boile
r
output and air at 20 deg. CO2 Fuel
Characteristics
Efficiency 100%
(N.C.V.)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
Medium Temp.
70°C
REX DUAL 80 F
800 688.000 840 722.400 95,24 88,89 65,97 65,26 1324,46 200 172.000 209,6 180.290 95,40 22,18 16,46 16,29 330,54
REX DUAL 100 F
1000 860.000 1048 901.280 95,42 110,90 82,31 81,42 1652,41 250 215.000 261,2 224.660 95,70 27,64 20,52 20,29 411,89
REX DUAL 124 F
1240 1.066.000 1298 1.116.280 95,53 137,35 101,94 100,84 2046,52 310 267.000 323,3 278.000 95,90 34,21 25,39 25,11 509,68
REX DUAL 150 F
1500 1.290.000 1572 1.351.920 95,42 166,35 123,46 122,12 2478,62 375 323.000 391,0 336.220 95,92 41,37 30,71 30,37 616,42
REX DUAL 170 F
1700 1.462.000 1782 1.532.520 95,40 188,57 139,96 138,44 2809,69 425 366.000 443,6 381.520 95,80 46,94 34,84 34,46 699,48
REX DUAL 190 F
1900 1.634.000 1994 1.714.840 95,29 211,01 156,61 154,91 3144,05 475 409.000 496,3 426.850 95,70 52,52 38,98 38,56 782,58
REX DUAL 200 F
2040 1.754.000 2138 1.838.680 95,42 226,24 167,92 166,10 3370,98 510 439.000 532,6 458.070 95,75 56,36 41,83 41,38 839,82
REX DUAL 240 F
2400 2.064.000 2518 2.165.480 95,31 266,46 197,76 195,62 3970,25 600 516.000 626,0 538.340 95,85 66,24 49,16 48,63 986,99
REX DUAL 260 F
2600 2.236.000 2728 2.346.080 95,31 288,68 214,25 211,93 4301,33 650 559.000 678,6 583.630 95,78 71,81 53,30 52,72 1070,02
Heat output Furnace output
Medium Temp.
70°C
Minimum
input
Minimum
output
Medium Temp.
70°C
Characteristics
Pressure losses
flue gas side
Heat losses through
the chimney
Heat losses through
the casing
Heat losses with
burner off
Flue gas temp. at boiler
output and air at 20 deg. C CO2 Press. losses water side
Design
Pressure
Total
capacity
Total
weight
Electric
supply
Freque
ncy
Insulation
class
Electric
power
mba
r
%%% °C%mba
r
ba
r
lkg Volt ~ Hz IP W
GAS GAS (∆T=12°C) With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil Heavy oil Wood
REX DUAL 80 F
4,7 4,26 0,50 0,10 127 11,0 20 5 720 1167 230 50 IP X0D 20 X X - - -
REX DUAL 100 F
4,8 4,08 0,50 0,10 122 11,0 22 5 1080 1705 230 50 IP X0D 20 X X - - -
REX DUAL 124 F
7,3 3,97 0,50 0,10 120 11,0 27 5 1290 1925 230 50 IP X0D 20 X X - - -
REX DUAL 150 F
5,8 4,08 0,50 0,10 122 11,0 25 5 1710 2409 230 50 IP X0D 20 X X - - -
REX DUAL 170 F
8,0 4,10 0,50 0,10 123 11,0 27 5 1710 2409 230 50 IP X0D 20 X X - - -
REX DUAL 190 F
5,9 4,21 0,50 0,10 126 11,0 32 5 1900 2833 230 50 IP X0D 20 X X - - -
REX DUAL 200 F
4,5 4,08 0,50 0,10 122 11,0 26 5 2400 3686 230 50 IP X0D 20 X X - - -
REX DUAL 240 F
6,2 4,19 0,50 0,10 125 11,0 30 5 2400 3686 230 50 IP X0D 20 X X - - -
REX DUAL 260 F
7,3 4,19 0,50 0,10 125 11,0 32 5 2400 3686 230 50 IP X0D 20 X X - - -
Fuel

9
HH1 H2 H4 H6 H10 LL2 L4 PP2 P3 P4 P5 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
REX DUAL 80 REX DUAL 80 F 1690 1015 500 1095 500 50 1901 890 955 1872 1502 600 850 422 230-280 225 250 100 100 1" 1" 1"1/4(1) 1/2" 1/2"
REX DUAL 100 REX DUAL 100 F 1880 1205 610 1285 610 60 2341 1110 1175 1946 1502 663 850 433 270-320 225 300 100 100 1" 1"1/4 1"1/4 1/2" 1/2"
REX DUAL 124 REX DUAL 124 F 1900 1205 610 1285 610 60 2341 1110 1175 2235 1792 663 1150 422 270-320 225 300 125 125 1" 1"1/4 1"1/4 1/2" 1/2"
REX DUAL 150 REX DUAL 150 F 2155 1335 675 1417 675 60 2600 1240 1305 2247 1753 704 1100 443 270-320 280 350 150 150 1" 1"1/4 1"1/2 1/2" 1/2"
REX DUAL 170 REX DUAL 170 F 2155 1335 675 1417 675 60 2600 1240 1305 2247 1753 704 1100 443 270-320 280 350 150 150 1" 1"1/4 1"1/2 1/2" 1/2"
REX DUAL 190 REX DUAL 190 F 2155 1335 675 1417 675 60 2600 1240 1305 2497 2003 704 1200 593 270-320 280 350 200 200 1" 1"1/4 1"1/2 1/2" 1/2"
REX DUAL 200 REX DUAL 200 F 2030 1485 750 1568 750 60 2900 1390 1455 2477 2003 703 1200 574 270-320 280 400 200 200 1" 1"1/4 1"1/2 1/2" 1/2"
REX DUAL 240 REX DUAL 240 F 2030 1485 750 1568 750 60 2900 1390 1455 2477 2003 703 1200 574 270-320 280 400 200 200 1" 1"1/4 1"1/2 1/2" 1/2"
REX DUAL 260 REX DUAL 260 F 2030 1485 750 1568 750 60 2900 1390 1455 2477 2003 703 1200 574 270-320 280 400 200 200 1" 1"1/4 1"1/2 1/2" 1/2"
Dimensions
(1) One fitting only
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well

10
2.6 STR BOILER
Characteristics
Efficiency 100%
(N.C.V.)
Effic. 100%
(stars)
NG max flow
rate G20
NG max flow
rate G30
NG max flow
rate G31
Max flow rate
of flues
Efficiency at
30%
NG min flow
rate G20
NG min flow
rate G30
NG min flow
rate G31
Min flow rate
of flues
k
W
kcal/h kW kcal/h % % m³/h kg/h kg/h kg/h kW kcal/h kW kcal/h % m³/h kg/h kg/h kg/h
Medium Temp.
70°C
(Efficienty Dir.
92/42/CEE
)
Medium Temp.
70°C
STR 20
232 200.000 252 216.720 92,06
**
26,67 19,79 19,58 397,38 116 100.000 127,7 109.810 90,85 13,51 10,03 9,92 201,33
STR 25
291 250.000 314 270.040 92,68
**
33,23 24,66 24,39 495,13 145,5 125.000 160,7 138.170 90,56 17,00 12,62 12,48 253,32
STR 30
349 300.000 378 325.080 92,33
**
40,00 29,69 29,37 596,00 174,5 150.000 192,4 165.440 90,71 20,36 15,11 14,94 303,32
STR 35
407 350.000 441 379.260 92,29
-
46,67 34,64 34,26 695,38 203,5 175.000 223,9 192.530 90,90 23,69 17,58 17,39 352,98
Heat output Furnace output
Medium Temp.
70°C
Minimum
input
Minimum
output
Medium Temp.
70°C
Characteristics
Pressure losses
flue
g
as side
Heat losses through
the chimne
y
Heat losses through
the casin
g
Heat losses with
burner of
f
Press. losses
water side
Design
Pressure
Total
capacit
y
Total
wei
g
ht
Electric
suppl
y
Freque
nc
y
Insulation
class
Electric
powe
r
mbar % % % °C °C °C % % % mbar bar l kg Volt ~ Hz IP W
GAS GASOIL HEAVY
OIL GAS GASOIL HEAVY OIL
(∆T=12°C) With electr.
contr. (excluded
pump and burner)
Nat. gas Lpg Gasoil H eavy oil
Wood
STR 20
2,0 7,14 0,80 0,10 189 192 192 10,5 13,5 14,0 16 5 320 780 230 50 IP X0D 20 XXXX -
STR 25
2,5 6,52 0,80 0,10 175 178 178 10,5 13,5 14,0 18 5 320 780 230 50 IP X0D 20 XXXX -
STR 30
3,0 6,87 0,80 0,10 183 186 186 10,5 13,5 14,0 20 5 390 980 230 50 IP X0D 20 XXXX -
STR 35
4,0 6,91 0,80 0,10 184 187 187 10,5 13,5 14,0 25 5 390 980 230 50 IP X0D 20 XXXX -
Flue gas temp. at boile
r
output and air at 20 deg. CO2 Fuel
Dimensions H
H1 H2 H4 H6 H10
L
L2
P
P2 P3 P4 P5 P6 Øb Øc N1 N2 N3 N4 N5 N6 N8
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm DN/in DN/in DN/in DN/in DN/in in in
STR 20
1375 1200 440 1292 900 155 750 700 1900 1410 685 800 415 270-320 180 250 65 65 1" 1" 1" 1/2" 1/2"
STR 25
1375 1200 440 1292 900 155 750 700 1900 1410 685 800 415 270-320 180 250 65 65 1" 1" 1" 1/2" 1/2"
STR 30
1465 1290 460 1382 950 155 800 750 1950 1460 685 850 415 270-320 225 250 80 80 1"1/4 1"1/4 1" 1/2" 1/2"
STR 35
1465 1290 460 1382 950 155 800 750 1950 1460 685 850 415 270-320 225 250 80 80 1"1/4 1"1/4 1" 1/2" 1/2"
N1 - Flow
N2 - Return
N3 - Fitting for instruments
N4 - System filling/drainage
N5 - Fitting for safety valves
N6 - Bulb wells
N8 - Inspection well

11
3 INSTALLATION
Before connecting the boiler, perform the following operations:
•Thoroughly clean all the system pipes in order to remove any foreign matter that could affect correct op-
eration of the boiler;
•Check that the flue has an adequate draught, that there is no narrowing of passages and that it is free
from debris; also check that other appliances do not discharge into the flue (unless designed to serve
several utilities). See the regulations in force.
3.1 THERMAL PLANT
3.1.1 BOILER ROOM
As a rule, regulations in force should be always observed. Premises in which boilers will be installed should be suffi-
ciently ventilated and guarantee access for ordinary and extraordinary maintenance operations.
3.1.2 FLUE
The pressurised boiler that now equips your heating system is so-called because it uses a burner provided
with fan which introduces into the combustion chamber the exact amount of air necessary in relation to the
fuel and maintains an overpressure in the furnace equivalent to all the internal resistances of the flue gas
path as far as the boiler exhaust. At this point the fan pressure should have dropped to zero to prevent the
flue connection pipe and the lower area of the flue itself from being under pressure and combustion gas
leaks occurring in the boiler room.
The connection pipe from the boiler to the base of the flue must slope upwards in the direction of the flue
gas flow with recommended gradient of no less than 10%. Its path must be as short and straight as possible
with the bends and fittings rationally designed in accordance with air duct criteria
The paragraph Technical Specifications specifies the flue connection diameters of the boilers for lengths of
up to 1 metre. For more winding paths, the diameter must be suitably enlarged.

12
3.2 HYDRAULIC CONNECTION
3.2.1 HOT WATER HEATING SYSTEM WITH CLOSED EXPANSION VESSEL - Furnace output ≤
300.000 kcal/h - pressure 5 bar (Fig. 1)
3.2.2 HOT WATER HEATING SYSTEM WITH CLOSED EXPANSION VESSEL - Furnace output >
300,000 kcal/h - pressure 5 bar (Fig. 2)
Ensure that the hydraulic pressure measured after the reduction valve on the supply pipe does not exceed
the operating pressure specified on the rating plate of the component (boiler, heater etc.).
−As the water contained in the heating system increases in pressure during operation, ensure that its
maximum value does not exceed the maximum hydraulic pressure specified on the component rating
plate (5 bar).
−Ensure that the safety valve outlets of the boiler and hot water tank, if any, have been connected to an
exhaust funnel in order to prevent the valves from flooding the room if they open.
−Ensure that the pipes of the water and heating system are not used as an earth connection for the
electrical system as this can seriously and very rapidly damage the pipes, boiler, heater and radiators.
−Once the heating system has been filled, you are advised to close the supply cock and keep it closed so
that any leaks from the system will be identified by a drop in hydraulic pressure indicated on the system
pressure gauge.
The generator must be provided with:
a - Safety valve
b - Expansion vessel (connected with a hose ≥18
mm diameter)
c - Regulation thermostats
d - Safety thermostat
e - Cut-off pressure switch
f - Well for control thermometer
g - Pressure gauge with flange for control pressure
gauge
h - Heat discharge valve or fuel on-off valve.
N1 - Flow
N2 - Return
N3 – Instrument fitting
N4 – Lower fitting:
N4b expansion vessel fitting
N4c filling/drain
N6 - Bulb wells (thermometer, pump consent thermo-
stat, regulation thermostat, safety thermostat).
The generator must be provided with:
a - 1 safety valve
2 safety valves if output is > 500,000 kcal/h
b - Expansion vessel
c - Regulation thermostats
d - 1st safety thermostat
f - Cut-off pressure switch
g - Well for control thermometer
h - Pressure gauge with flange for control pres-
sure gauge
i - Heat discharge valve or fuel on-off valve
N1 - Flow
N2 - Return
N3 - Instrument fitting
N4 - Lower fitting:
N4b expansion vessel fitting
N4c Filling/drain
N5 - Safety valves fitting
N6 -Bulb wells (thermometer, pump consent
thermostat, regulation thermostat, safety
thermostat)
Fig. 2
Fig. 1

13
3.2.3 REX DUAL/REX DUAL F (side by side) 80÷260 POSITIONING INSTRUMENTS
Key
1. Pressure switch fitting
2. 1st safety valve fitting or thermal drainage 1st safety
3. 1st boiler circulator consent thermostat and safety thermostat bulb wells
4. Manometer fitting with control manometer flange
5. 2nd safety valve fitting or thermal drainage 1st safety
6. 2nd boiler circulator consent thermostat and safety thermostat bulb wells
7. Flanges to weld after the definitive and correct positioning of the boilers
8. 1st and 2nd boiler fuel valve bulbs wells
9. Boiler thermometer bulb well
10.1st and 2nd boiler bi-thermostats bulbs well, digital regulator thermal-resistance (optional)
11.Temperature test bulb wells
M. Flow
R. Return

14
−
3.3 ELECTRICAL CONNECTION
Electrical systems of thermal plants designed only for heating purposes must comply with numerous le-
gal regulations which apply to in general as well as specifically to each application or fuel type.
3.4 REX/REX F/REX K/REX K F/STR CONTROL PANEL (Fig. 3)
The control panel supplied with the boilers is made of self-extinguishing plastic and houses the regulation
and safety instruments:
Fig. 3
KEY
1 PANEL LIVE
2 BURNER SWITCH N. 1
4 HEATING PUMP SWITCH
7 BOILER THERMOMETER
8 CONTROL THERMOSTAT N. 1
9 SAFETY LIMIT THERMOSTAT N. 1
11 CONTROL THERMOSTAT N. 2
The upper part of the control panel can be rotated to gain access to the terminal board and uncoil the ther-
mostat and thermometer capillaries. A copy of the wiring diagram is contained inside the control panel cover.
The regulation thermostats (TR1-TR2) have an operating range from 60° to 90° and can be set by the user
by means of the front knob.
Safety thermostats (TS) has a fixed setting of 100 (+0/-6)°C and can be manually reset in accordance with
Ministerial Decree 1/12/75 «R».
Circulator consent thermostat (TM) has a fixed setting of 50°C with a working range of 6°C: at start-up,
with the heating system cold, this permits higher boiler temperatures to be maintained thus reducing the risk
of flue gas condensation.
For correct installation, refer to the boiler casing assembly instructions.
WIRING DIAGRAM
Refer to the diagram supplied with the specific switchboard.

15
3.5 REX DUAL/REX DUAL F OPERATING PRINCIPLES
The boiler consists of 2 units of same capacity and one only control panel for both units. Each unit can work
independently and the boiler can be operated partially. This means that all panel controls (burner switches,
thermostats and thermometers) have been doubled. See paragraph 4.5 on connection. As an example, bi-
thermostats TR1 and TR2 can be adjusted so that there is a 10°C intervention difference between each
other (do not forget that knobs have a 43° to 85° regulation range with a 1/2 turn rotation about). Flow water
temperature after 2 equal flows have been mixed corresponds to mean flow temperature of two units
3.5.1 REX DUAL/REX DUAL F CONTROL PANEL (Fig. 4)
The standard control panel is made of plastic with IP40 protection degree and houses the regulation and
safety instruments:
The upper part of the control panel can be rotated to gain access to the terminal board and uncoil the ther-
mostat and thermometer capillaries. A copy of the wiring diagram is contained inside the control panel.
The regulation bi-thermostats (TR1 and TR2) have an operating range from 43° to 85° and can be set by
the user by means of the front knob. The temperature differential of each bi-thermostat is fixed and approx.
7°C.
Safety thermostats (TS1 and TS2) have a fixed setting of 100 (+0/-6)°C and can be manually reset in ac-
cordance with Ministerial Decree 1/12/75 «R».
Circulator consent thermostats (TM1 and TM2) have a fixed setting of 45°C with a working range of 6°C:
at start-up, with the heating system cold, this permits higher boiler temperatures to be maintained thus re-
ducing the risk of flue gas condensation.
For correct installation, refer to the boiler casing assembly instructions..
Note: both hour meters start each time their own burner starts. It is recommended that the numbers dis-
played by both hour meters are monitored . This helps guarantee that burners have almost the same number
of working hours.
Fig. 4
KEY
1 PANEL LIVE
2 BURNER SWITCH N. 1
3 BURNER SWITCH N. 2
4 HEATING PUMP SWITCH
7 BOILER THERMOMETER
8 CONTROL THERMOSTAT N. 1
9 SAFETY LIMIT THERMOSTAT N. 1
11 CONTROL THERMOSTAT N. 2
12 SAFETY LIMIT THERMOSTAT N. 2
13 HOURS RUN METER BOILER N. 1
14 HOURS RUN METER BOILER N. 2
WIRING DIAGRAM
Refer to the diagram supplied with the specific switchboard.

16
3.6 INVERTING THE DOOR APERTURE
If the door is to be opened to the opposite side, act as follows:
1. Switch the outside nut (or bush) of one hinge with the diametrically opposite closure bush; then at the
hinge side, fasten the cone to the door with the inside nut.
2. Repeat the operation for the other hinge.
3. For any adjustment needed, act on the specific hinge nuts.
3.7 BURNER CONNECTION
Before installation you are advised to thoroughly clean the inside of all the fuel supply system pipes in order to
remove any foreign matter that could affect correct operation of the boiler. See technical specification tables
and check the max pressure value inside the furnace. The value found on the table may also increase by 20% if
heavy oil is used instead of gas or light oil; furthermore the following checks should also be carried out:
a) Check the internal and external seal of the fuel supply system;
b) Regulate the fuel flow according to the power required by the boiler;
c) Check that the boiler is fired by the correct type of fuel;
d) Check that the fuel supply pressure is within the values specified on the burner rating plate;
e) Check that the fuel supply system is sized for the maximum flow rate necessary for the boiler and that it
is provided with all control and safety devices provided for by the regulations referred to above;
f) Check that the boiler room vents are sized in order to guarantee the air flow established by the regula-
tions referred to above and that they are in any case sufficient to obtain perfect combustion.
In particular, when using gas:
g) Check that the feeding line and the gas ramp comply with the regulations in force;
h) Check that all the gas connections are sealed;
i) Check that the gas pipes are not used as earth connections for electrical appliances.
If the boiler is not going to be used for some time, close the fuel supply cock or cocks.
IMPORTANT: check that the air spaces between the burner draught tube and the manhole are suita-
bly filled with thermoinsulating material (Fig. 5). The boiler is supplied with a piece of ceramic rope.
Should this not suit the burner used, use a braid of different diameter bur same material.
All details on the draught tube length (P6), the diameter of the burner hole (Øb) and the pressurization are included
in the par. Technical Specifications.
1
4
3
2
Fig. 5
KEY:
1. Burner
2. Manhole
3. Thermoinsulating material
4. Flange
P6
Ø
b

17
4 ASSEMBLY
4.1 REX K/REX K F ASSEMBLY (Fig. 6-7)
Ensure that installation premises floor is even and perfectly horizontal.
For perfect welding, use acid or rutile cored electrodes (check codes AWS E6020 or AWS E6013 or E44LA3
or E44LC3).
a) Put the boiler rear plate (1) on the floor with the hinges pointing down and ensure that it is perfectly lev-
elled (mark the middle of the plate sides in order to position correctly the furnace and the tube nest.
b) Position the furnace (2) on the internal edge of the front plate (1) keeping the longitudinal welding of the
furnace in the lower part of the boiler. Ensure that plate and furnace are perfectly perpendicular
when coupling them.
c) Weld the furnace (2) onto the front plate (1) along the outer circumference.
d) Add the top tube nest part (3) (the return stub which can be recognised by its flow trap (4) welded inside
the tube nest, must be close to the front tube plate). For positioning, ensure that the flanged stub
hole axis is aligned with the sign previously marked on the plate middle. For easy centering, check
height Abetween the tube nest edge and the plate edge. Spot-weld the middle only.
e) Position the lower tube nest (5) in respect of height Band spot-weld it only in the lower middle part of the
rear plate (1).
f) Spot-weld the two tube nest parts (3) and (5)
g) Position the rear tube plate (6) and insert the tie rod or the stiffening stub (8) in the furnace.
h) Weld the rear tube plate (6) and the tie rod or stiffening stub (8), carefully avoiding any damage to the
four threaded rivets or screws which will be used to secure the smokebox.
i) Weld all the nest (3) and (5) onto the rear plate (1).
j) Now, smoke tubes (7) can be inserted and welded on the rear plate tube (6) keeping the boiler in upright
position or (but welding will be more difficult) horizontally; the choice will depend on the size of premises
and the equipment available to turn the boiler upside down. Caution: smoke tuber (7) must protrude 3
mm from the front plate (1) and approx. 10 mm from the rear plate (6).
NB: the condensate groove for the F version (with extruded aluminium) must be positioned in the
lower section (see Fig. 7)
k) Spot-weld the drain (N4) and ensure that it is perpendicular to the front plate (1) and parallel to the tube
nest.
l) Position the boiler horizontally. For this reason, a lifting hook is supplied that can be conveniently welded
to the tube nest in order to simplify the boiler overturning. Remember not to have this hook protruding
form the casing.
m) Weld the two parts of the tube nest (5) and (6) longitudinally as well as the furnace inside (2) to the front
plate (1); you can simplify this operation by using rolls for rotating.
n) Weld both ½” couplings (N6) onto the tube nest (3) after having ensured that the bulb sheaths inclination
is correct to avoid that sheaths are not blocked by smoke tubes; remove sheaths when welding. Weld
the two flanged stubs (N1) and (N2) for flow and return, ensuring that flanges are perfectly horizontal.
Weld the instrument fitting (N3) and fittings (N5) if included in the supply.
o) Weld smoke tubes (7) onto the rear plate (1).
p) Ensure that plate shapes (1) and (6) have not been altered and weld on plate surface the side frames
(9).
q) Weld the square tubes (10) that support the casing and, if part of the supply, weld also the side ones
keeping height C.
r) Carry out the hydraulic test under 7.5 bar pressure. FILL THE GUARANTEE WITH THE TEST DATE.
s) Install the manhole (11) and the smoke box (12).
t) Touch-up visible parts by using the paint supplied.
Warning: before start up insert turbolators in the tube nest pushing until their reach the tube plate.

18
MOD 7 8 9 10 12 15 20 25 30 35 40 50 62 75 85 95 100 120 130 140 160 180
A 100 100 100 100 100 100 100 100 100 100 85 85 85 85 85 85 85 85 85 85 85 85
B 100 100 100 100 100 100 100 100 100 100 95 125 125 125 125 125 125 125 125 215 215 215
C - - - - - - - - - - - 550 550 605 605 605 680 680 680 - - -
Key
1. Front tube plate
2. Furnace
3. Upper tube nest
4. Flow trap
5. Lower tube nest
6. Rear tube nest
7. Smoke tubes
8. Tie rod or stiffening stub
9. Side frame
10. Square tubes
11. Manhole
12. Smokebox
N1 Flow
N2 Return
N3 Instrument fitting
N4 Lower fitting
N5 Fitting for safety valve and expansion vessel
N6 Bulb wells
Fig. 6
Fig. 7
DIMENSIONS AND WEIGHTS OF THE BULKIEST PARTS
Furnace Manhole
MOD.
Ø
mm
length
mm
weight
kg
width
mm
height
mm
weight
kg
7 400 645 24 700 630 33
8 400 645 24 700 630 33
9 400 770 29 700 630 33
10 400 770 29 700 630 33
12 400 770 29 700 630 33
15 450 1018 53 750 680 40
20 450 1018 53 750 680 40
25 450 1240 67 750 680 65
30 500 1240 73 850 778 90
35 500 1490 88 850 778 90
40 545 1490 115 890 807 110
50 645 1500 145 1100 984 180
62 645 1790 172 1100 984 180
75 690 1800 227 1240 1130 210
85 690 1800 227 1240 1130 210
95 690 2050 257 1240 1130 210
100 790 2065 316 1390 1270 235
120 790 2065 316 1390 1270 235
130 790 2065 316 1390 1270 235
140 845 2378 390 1470 1367 435
160 845 2378 390 1470 1367 435
180 845 2588 425 1470 1367 435

19
4.2 REX/REX F/REX K/REX K F 7-40 BOILER CASINGS (Fig. 8)
a) Wrap the glass wool around the boiler body leaving the bulb well (P) on the right side exposed.
b) Insert the wires connecting the burner to the control panel in the lower slits of panel (1S) and (1D), allow-
ing for the opening direction of the manhole.
c) Fit the panel (1S), inserting the upper fold into the square tube and the lower fold to the boiler side
frame.
d) Fit the upper panel (2S) on the boiler and fit on this panel the control panel; uncoil the thermometer and
thermostat capillaries and insert the bulbs in the wells.
e) Fit panel (1D) as indicated under point c); fit panel (2D) ensuring that the capillaries are inserted in the
slot provided in the panel itself. Securing the control panel.
f) Secure the upper panels by screws and close the passage holes with special caps (see figure)
Super-isolation (on request)
g) Fit panels (3) and (4) connecting them to the side panels.
Fig. 8
Key: PBulb wells – TR1-TR2 Regulation thermostats - TS Safety thermostat - TM Circulator consent thermo-
stat - TMC Boiler thermometer.