SR Plus Combination - CMS

SR-plus Combination
Boilers 50kW to 600kW
The Hoval Combination
boiler couples the tried and tested technology of the SR-plus boiler with that of
the CT-plus and Modul-plus Hoval calorifier range. Mounted above, in the case
of the standard model or above or adjacent, in the case of the special model options,
the calorifier combines with the boiler to provide a fully integrated package,
including the primary circulating pump and DHW temperature control instrumentation.
Application
Compact design and flexibility are fundamental to the combination boiler which
is ideal for limited floor areas, or where there is a policy of decentralising boiler
plant to point of use.
But first and foremost the 'combination' succeeds where there are peak demands
for DHW, eg. hotels, leisure centres, canteens and military accommodation. It is
here that the SR-plus combination comes into its own, offering low cost installation
in tandem with optimum energy efficiency.
'Mix & Match'
Tailored special combination packages, as for example, in the case of dedicated
DHW generation, are available through Hoval 'mix & match' packages.
For mixed heating and DHW applications, please refer to the tables.
Hoval Limited - Page 1
Hoval Limited

Hoval Limited
Multi Fuel Design
A reverse flame steel boiler, the SR-plus Combination is available with a range
of matched burners, suitable for firing with oil, gas or dual fuel burners.
The stainless steel calorifier used in the construction can be either CT-plus or
Modul-plus. Both types consist of a high grade stainless steel inner vessel/s
with a 'rippled' wall, surrounded by a mild steel primarily water jacket. The CTtype
has one single cylinder whereas the Modul type is designed with banks of
horizontal stainless steel cylinders which can be stacked up three high.
Cylinders are wrapped in a metallic backed insulation blanket and are cased
with insulation lined steel panels, as in the boiler.
Efficiency
For DHW generation the Hoval patented rippled heat transfer surface:-
• gives rapid regeneration of secondary water temperatures even after complete
draw off.
• provides an extended heat transfer surface within the compact cylinder.
• creates turbulence on the primary water side to enhance heat transfer.
• reduces scale adherence to the cylinder wall by the natural flexing arising
from the temperature variations in the cylinder.
Temperature Control
CIBSE and Department of Health codes of practice recommend that DHW be
stored at a minimum of 60°C to prevent the risk of legionella bacteria contamination.
The control panel contains a thermostat which allows for DHW temperature
adjustment. In instances where DHW is required at 60°C the supply
can be taken direct from the calorifier. For washing and showering duties which
require a lower temperature, external blending is required. The Hoval Irgumat
blending valve is recommended.
Maintenance
The corrosion resistant stainless steel material of the calorifiers requires only
minimal inspection and cleaning. Scale formation is limited by the ripple design
and the expansion and contraction of the unit means that it is largely self
descaling.
The units can be manually or chemically cleaned throughout the relevant inspection
covers. It is recommended that after prolonged periods of service the
secondary cylinders are given a thorough flushing.
Standard models make use of the system valving for drain down access to the
primary pump. Isolating valves can be fitted to the pump as an optional extra.
Hoval Limited - Page 2

Technical & Performance Details
SR-plus combination boilers
M
N
▲
▲
▲
Combination
Model
50/280
75/280
100/280
125/280
150/420
150/520
175/420
175/520
200/420
200/520
225/420
225/520
250/520
275/520
300/520
325/520
250/A22
275/A22
300/A22
325/A22
325/A32
350/A22
350/A32
400/A22
400/A32
500/A32
500/A33
600/A32
600/A33
Boiler
Rating
kW
31-55
56-88
89-110
111-147
148-160
148-160
160-175
160-175
176-200
176-200
201-230
201-230
231-250
251-270
271-293
294-335
231-250
251-270
271-293
294-335
294-335
336-360
336-360
361-410
361-410
411-500
411-500
501-600
501-600
▲
L
▲
▲
▲
10
D E F
650
650
650
650
790
790
790
790
790
790
790
790
870
870
870
870
870
870
870
870
870
950
950
950
950
1125
1125
1125
1125
1197
1197
1197
1197
1472
1472
1472
1472
1472
1472
1472
1472
1414
1414
1414
1414
1414
1414
1414
1414
1414
1590
1590
1590
1590
1886
1886
1886
1886
126
126
126
126
106
106
106
106
106
106
106
106
106
106
106
106
106
106
106
106
106
156
156
156
156
156
156
156
156
▲
▲
▲
11
5
7
6
P
4
3
9
▲
▲
*
▲
1 & 2
Width B shown opposite on page 4
A B C D E F G H J K L M N
1635
1635
1635
1635
1850
1850
1850
1850
1850
1850
1850
1850
1910
1910
1910
1910
2253
2253
2253
2253
2560
2305
2612
2305
2612
2807
2807
2807
2807
170
170
170
170
170
170
170
170
170
170
170
170
220
220
220
220
220
220
220
220
220
210
210
210
210
230
230
230
230
130
130
130
130
170
170
170
170
170
170
170
170
100
100
100
100
100
100
100
100
200
210
210
210
210
190
190
190
190
180
180
180
180
230
230
230
230
230
230
230
230
250
250
250
250
250
250
250
250
250
320
320
320
320
338
338
338
338
445
445
445
445
515
515
515
515
515
515
515
515
540
540
540
540
540
540
540
540
540
575
575
575
575
675
675
675
675
▲
760
760
760
760
875
875
875
875
875
875
875
875
955
955
955
955
955
955
955
955
955
987
987
987
987
1182
1182
1182
1182
Hoval Limited - Page 3
▲
▲
H
Hoval Limited
1 Flow
2 return
3 safety valve
4 flue outlet
5 DHW Flow (Vented)
6 DHW Cold feed
7 DHWReturn
8 Calorifier primary with air bleed
9 Boliler drain
10 Connection for primary AAV
(supplied by installer)
11 Non Return valve
* Flanged for SR500 and above
P
Flue
I/D
Weights kg
Boiler Cal Total wet
1225 275 795 840 90 180 460 211
1225 275 795 840 90 180 460 211
1225 275 795 840 90 180 480 211
1225 275 795 840 90 180 500 211
1405 - 940 910 100 200 630 248
1405 396 940 910 100 200 630 302
1405 - 940 910 100 200 630 248
1405 396 940 910 100 200 630 302
1405 - 940 910 100 200 640 248
1405 396 940 910 100 200 640 302
1405 - 940 910 100 200 650 248
1405 396 940 910 100 200 650 302
1465 454 1000 910 115 225 795 302
1465 454 1000 910 115 225 805 302
1465 454 1000 910 115 225 805 302
1465 454 1000 910 115 225 815 302
1165 536 10001253
115 225 795 480
1165 536 10001253
115 225 805 480
1165 536 10001253
115 225 805 480
1165 536 10001253
115 225 815 480
1165 536 10001560
115 225 815 620
1277 360 10521253
115 225 1060 480
1277 360 10521560
300 225 1060 620
1277 360 10521253
115 225 1081 480
1277 360 10521560
300 225 1081 620
1411 64 12471560
300 250 1150 620
1411 64 12471560
300 250 1150 880
1411 64 12471560
300 250 1214 620
1411 64 12471560
300 250 1214 880
1253
1253
1265
1267
1782
1957
1782
1957
1784
1959
1786
1961
2102
2104
2104
2102
2145
2147
2147
2145
2545
2588
2988
2598
2998
3350
4000
3384
4034

For 280,
420,520
K
▲
▲
▲
▲
▲
▲
B
85
▲
▲
▲
▲
▲
10
▲
▲ ▲
5
85
85 6
7
▲
▲
85
▲
2 1
4
9
▲
3
▲
▲
▲
J
▲
▲
A
1268
K
▲
▲
▲
For A32, A33 For A22
▲
2
78
▲
B
▲
▲
338
60
6 7
4
9
▲
▲
3
▲
8 5
Hoval Limited - Page 4
908
K
▲
▲
▲
Hoval Limited
G G
Flow return & safety valve connections flanged to BS4504-PN6
M Mooo
o oddd
d deee
e l
l
BB B
o
o
i
i
l
l
e
e
r
r
k
k
W
W
rating
1
0
m
i
n
n
secondary
output
litres
C C
o
o
n
n
t
t
i
i
n
n
u
u
o
o
uu
u
s
s
secondary
output
litres
/ hour
C C
a
a
l
l
o
o
r
r
i
i
f
f
i
i
e
e
r
r
primary
requirement
kW
F
l
o
w
/
/
return
S S a
a f
f e
e t
t y
y
Valve
D DDHH
H
W
flow
DD D
H
WW
W
cold
feed
D
H
W
return
P P r
r i
i m
m a
a r rr
r y
y
water
content
litres
S S e
e c
c o
o n
n d
d a
a r
r y
y
water
content
litres
50/ 280
31-55 280 1000 55 40N/ B R1 1/ 4"
R1 1/ 4"
R1 1/ 4"
R 1" 217 280
75/ 280
56-88 280 1000 58 50N/ B R1 1/ 4"
R1 1/ 4"
R1 1/ 4"
R 1" 302 280
100/ 280
89-110 280 1000 58 50N/ B R1 1/ 4"
R1 1/ 4"
R1 1/ 4"
R 1" 294 280
125/ 280
111-147 280 1000 58 50N/ B R1 1/ 4"
R1 1/ 4"
R1 1/ 4"
R 1" 276 280
150/ 420
148-160 420 1350 78 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 484 420
150/ 520
148-160 520 1575 92 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 505 520
175/ 420
160-175 420 1350 78 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 484 420
175/ 520
160-175 520 1575 92 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 505 520
200/ 420
176-200 420 1350 78 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 476 420
200/ 520
176-200 520 1575 92 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 497 520
225/ 420
201-230 420 1350 78 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 468 420
225/ 520
201-230 520 1575 92 65N/ B R1 1/ 4"
R1 1/ 2"
R1 1/ 2"
R 1" 489 520
250/ 520
231-250 520 1575 92 80N/ B R1 1/ 2"
R1 1/ 2"
R1 1/ 2"
R 1" 485 520
275/ 520
251-270 520 1575 92 80N/ B R1 1/ 2"
R1 1/ 2"
R1 1/ 2"
R 1" 477 520
300/ 520
271-293 520 1575 92 80N/ B R1 1/ 2"
R1 1/ 2"
R1 1/ 2"
R 1" 477 520
325/ 520
294-335 520 1575 92 80N/ B R 2" R1 1/ 2"
R1 1/ 2"
R 1" 465 520
250/ A22
231-250 810 3500 204 80N/ B R1 1/ 2"
65N/ B 65N/ B R 1" 410 460
275/ A22
251-270 810 3500 204 80N/ B R1 1/ 2"
65N/ B 65N/ B R 1" 402 460
300/ A22
271-293 810 3500 204 80N/ B R1 1/ 2"
65N/ B 65N/ B R 1" 402 460
325/ A22
294-335 810 3500 204 80N/ B R 2" 65N/ B 65N/ B R 1" 390 460
325/ A32
294-335 1220 5680 330 80N/ B R 2" 65N/ B 65N/ B R 1" 420 690
350/ A22
336-360 810 3500 204 80N/ B 50N/ B 65N/ B 65N/ B R 1" 588 460
350/ A32
336-360 1220 5680 330 80N/ B 50N/ B 65N/ B 65N/ B R 1" 618 690
400/ A22
361-410 810 3500 204 80N/ B 50N/ B 65N/ B 65N/ B R 1" 577 460
400/ A32
361-410 1220 5680 330 80N/ B 50N/ B 65N/ B 65N/ B R 1" 607 690
500/ A32
411-500 1220 5680 330 100N/ B 65N/ B 65N/ B 65N/ B R 1" 890 690
500/ A33
411-500 1840 8500 495 100N/ B 65N/ B 65N/ B 65N/ B R 1" 935 1035
600/ A32
501-600 1220 5680 330 100N/ B 65N/ B 65N/ B 65N/ B R 1" 860 690
600/ A33
501-600 1840 8500 495 100N/ B 65N/ B 65N/ B 65N/ B R 1" 905 1035
▲
2
78
6
▲
B
▲
▲
4
78
5
60
9
7
▲
1
3
▲

Hoval Limited - Page 5
Hoval Limited