Strebel S-CB 60 Installation instructions

STREBEL
S-CB+Cascade Kits
Models +60 - +80 - +100 - +120 – PX 120 - +150 - +180
Installation & Operating Manual
2x60 up to 12x180
Please read and understand before commencing installation and leave the manual with the customer for future reference.
2017-05-01 v1

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INDEX
1.INTRODUCTION ....................................................................................................................................... 5
2.CASCADE SELECTION TABLE .............................................................................................................. 6
3.MAIN DIMENSIONS.................................................................................................................................. 8
4.EXPLANATION OF PARTS AND GROUPS .......................................................................................... 10
5.FRAME GROUPS ................................................................................................................................... 11
6.MOUNTING THE BOILERS ON THE FRAME ....................................................................................... 13
7.MOUNTING THE CONNECTING SETS ................................................................................................. 14
8.MOUNTING THE HYDRAULIC GROUP ................................................................................................ 16
8.1Hydraulic group for 2 boilers S-CB+ 60–120 and/or S-CB PX 120 ................................................. 17
8.2Hydraulic groups for 3 and 4 boilers S-CB+ 60–120 and/or S-CB PX 120 ..................................... 18
8.3Hydraulic groups for 2 and 3 boilers S-CB+ 150–180 ..................................................................... 19
8.4Hydraulic group for 4 boilers S-CB+ 150–180 ................................................................................. 20
8.5Hydraulic groups for 5 and 6 boilers S-CB+ 150–180 ..................................................................... 21
9.LOW VELOCITY HEADERS .................................................................................................................. 22
10.FLUE GAS AND AIR SUPPLY ............................................................................................................... 24
10.1Individual or common flue systems ................................................................................................ 24
10.2Individual flue systems .................................................................................................................... 24
10.3Common flue systems .................................................................................................................... 24
10.4Installation examples flue gas systems. ......................................................................................... 25
11.INSTALLATION ...................................................................................................................................... 26
12.PARAMETERS ....................................................................................................................................... 28
12.1Parameter settings for cascaded boilers ........................................................................................ 28
12.2Control panel / display unit ............................................................................................................. 29
12.3Setting the parameters using the control panel .............................................................................. 30
12.4Monitor screens .............................................................................................................................. 31
13.CASCADE CONTROL ............................................................................................................................ 32
13.1Output control ................................................................................................................................. 32
13.2Boiler sequence .............................................................................................................................. 32
14.OPTIONS ................................................................................................................................................ 33

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5
1. Introduction
Figure 1 - Typical cascade configuration (S-cb PX 120 Above).
This Cascade manual is intended for the S-CB+ and the S-CB PX 120 wall-hung high efficiency CH boilers
by Strebel Ltd. These boilers are available, in order of ascending output, as S-CB+60, +80, +100, +120,
PX120, +150 and +180.
The S-CB 60+ - 120+ (Not including the PX models) can be combined in one cascade set, as can the S-cb+
150-180 boilers, but the S-CB PX 120 models can only be combined with the PX 120 model.
Strebel Ltd can supply standard cascade systems with mounting frame, piping and low loss headers for up to
four boilers in the 60-120 range, four boilers in the PX 120 range and even six in the 150-180 range. For
cascades with more boilers, a dedicated system must be designed.
The Strebel S-CB+ boilers are standard equipped with an internal cascade manager for up to twelve boilers.
No extra controllers are necessary, only connect a 2-wire cable between all boilers.
The low-loss header can be fitted on the right-hand side as well as on the left-hand side without making any
alterations to the delivered parts. The gas connection can also be fitted on one of both sides, independently
from the side chosen for the low loss header.
To commission the cascade installation, it is necessary to set a number of parameters on the boilers, see
chapter 12.1.

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2. Cascade Selection Table
When selecting a cascade set-up, follow the next steps:
1. First determine the total required power of the set.
2. Determine the best number of boilers required (q. in the table(quantity)).
3. Choose one of the combinations in the table below (even more combinations are available).
4. Determine the required space for the set in the main dimensions’ tables and check this with the
planned location.
5. Determine the required flue gas and air supply lines.
6. Choose all the required accessories in the Options-chapter.
Total
Kw
Input
2 Boilers 3 Boilers 4 Boilers
Model q. Model q. Model q. Model q. Model q. Model q.
120 +60 2x
140 +80 1x +60 1x
160 +80 2x
180 +100 1x +80 1x +60 3x
200 +100 2x +80 1x +60 2x
220 +120 1x +100 1x +80 2x +60 1x
240 +120 2x +80 3x +60 4x
260
+100 1x +80 2x +80 1x +60 3x
280
+100 2x +80 1x +80 2x +60 2x
300 +150 2x +100 3x +80 3x +60 1x
320
+120 1x +100 2x +80 4x
330 +180 1x +150 1x
340
+120 2x +100 1x +100 1x +80 3x
360 +180 2x +120 3x +100 2 +80 2x
380
+100 3x +80 1x
400
+100 4x
420
+120 1x +100 3x
440
+120 2x +100 2x
450
+150 3x
460
+120 3x +100 1x
480
+180 1x +150 2x +120 4x
510
+180 2x +150 1x
540
+180 3x
600
+150 4x
630
+180 1x +150 3x
660
+180 2x +150 2x
690
+180 3x +150 1x
720
+180 4x
* Figures in this column are the gross calorific values in kW at 100% load
Table continues next page 

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 Continuation from previous page
Total
Kw
Input
5 Boilers 6 Boilers
Model q. Model q. Model q. Model q.
750 +150 5x
780 +180 1x +150 4x
810 +180 2x +150 3x
840 +180 3x +150 2x
870 +180 4x +150 1x
900 +180 5x +150 6x
930
+180 1x +150 5x
960
+180 2x +150 4x
990
+180 3x +150 3x
1020
+180 4x +150 2x
1050
+180 5x +150 1x
1080
+180 6x

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3. Main dimensions
Figure 2. Cascade dimensions. The picture shows connecting sets for S-CB+ boilers – for the S-CB PX boilers the connecting sets are different.

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6 boilers
3045 3162 4071
889 770 220
1000
DN 125 PN6 (5") DN 125 PN6 (5")
DN 80 (3")
335 294
Table 1. Main dimensions (mm and " ).
5 boilers
2489 2607 3516
889 770 220
1000
DN 125 PN6 (5") DN 125 PN6 (5")
DN 80 (3")
335 294
4 boilers
1980 2084 2393
290 791 768 440
DN 80 PN6 (3") DN 80 PN6 (3")
R 2"
283 283
4 boilers
1980 2090 2465
355 768 168 440
DN 100 PN6 (4") DN 100 PN6 (4")
DN 80 (3")
338 283
3 Boilers
1520 1630 1914
265 789 766 487
DN 65 PN6 (2½") DN 65 PN6 (2½")
R 1½"
283 283
3 boilers
1520 1630 1940
290 766 165 440
DN 80 PN6 (3") DN 80 PN6 (3")
R 2"
338 283
2 Boilers
1015 1140 1358
190 787 766 436
RP 1½"
R 1½" R 1¼"
271 283
2 boilers
1015 1125 1408
265 766 144 487
DN 65 PN6 (2½") DN 65 PN6 (2½")
R 2"
338 283
S-CB Boilers +60 - +120 L1 (frame) L2 (standards) L3 (total) L4 (open header) H1 (gas) H2 (open header) H3 (open header) D1 (Header Connections Sizes) D2 (Header Connections Sizes) D3 (gas) A (gas) B (headers) S-CB Boilers +150 - +180 L1 (frame) L2 (standards) L3 (total) L4 (open header) H1 (gas) H2 (open header) H3 (open header) D1 (Header Connections Sizes) D2 (Header Connections Sizes) D3 (gas) A (gas) B (headers)

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4. Explanation of parts and groups
Each cascade set exists of the following parts and groups:
1. The number of S-CB+ type boilers as selected in chapter 2.
2. The frame group (with locking plates) as determined by the number of boilers.
3. Connecting groups to connect the boilers to the hydraulic groups (one group for each boiler, each group
existing of 1 gas, 1 flow and 1 return connecting set).
4. Hydraulic group, existing of 1 gas, 1 flow and 1 return header with all fixing and connecting parts.
5. Low-loss header to connect hydraulic group to your heating installation.
Figure 3. Cascade parts and groups. For the S-CB PX boilers, the return connecting sets are different from the S-CB+.
S-CB+ Model
Frame group
S
-
CB PX Model
Hydraulic Group
Low Velocity
Header
Connecting
sets S-CB+
Connecting
sets S-CB PX

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5. Frame groups
Figure 4. Cascade frame groups for 1, 2, 3, 4, 5 and 6 boilers.

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E00.000.158 E00.000.159 E00.000.160
Frame 1 Boiler Frame 2 Boilers Frame 3 Boilers
Pos Description part.no. q part.no. q part.no. q
1 standard E02.040.004 2 E02.040.004 2 E02.040.004 2
2 upper beam E02.040.005 1
upper beam E02.040.006 1
upper beam E02.040.007 1
3 mid/lower beam E02.040.008 2
mid/lower beam E02.040.009 2
mid/lower beam E02.040.010 2
4 locking plate E01.004.126 1 E01.004.126 2 E01.004.126 3
5 lock bolt M8 x 35 E06.000.023 1 E06.000.023 2 E06.000.023 3
6 seal plug 70mm x 50mm E05.001.285 2 E05.001.285 2 E05.001.285 2
seal plug 50mm x 50mm E05.001.101 4 E05.001.101 4 E05.001.101 4
7 bolt M8 x 70 M8 x 70 12 M8 x 70 12 M8 x 70 12
bolt M8 x 120
nut M8 M8 12 M8 12 M8 12
washer M8 M8 13 M8 14 M8 15
8
adjusting bolt standard
M16 x 80 M16 x 80 4 M16 x 80 4 M16 x 80 4
E00.000.161 E00.000.207 E00.000.206
Frame 4 Boilers Frame 5 Boilers Frame 6 Boilers
Pos Description part.no. q part.no. q part.no. q
1 standard E02.040.004 3 E02.040.004 5 E02.040.004 6
2 upper beam E02.040.005 1
upper beam E02.040.006 2 E02.040.006 2 E02.040.006 3
upper beam
3 mid/lower beam E02.040.008 2
mid/lower beam E02.040.009 4 E02.040.009 4 E02.040.009 6
mid/lower beam
4 locking plate E01.004.126 4 E01.004.126 5 E01.004.126 6
5 lock bolt M8 x 35 E06.000.023 4 E06.000.023 5 E06.000.023 6
6 seal plug 70mm x 50mm E05.001.285 3 E05.001.285 5 E05.001.285 6
seal plug 50mm x 50mm E05.001.101 6 E05.001.101 10 E05.001.101 12
7 bolt M8 x 70 M8 x 70 18 M8 x 70 18 M8 x 70 12
bolt M8 x 120 M8 x 120 6 M8 x 120 12
nut M8 M8 18 M8 24 M8 24
washer M8 M8 22 M8 29 M8 30
8
adjusting bolt standard
M16 x 80 M16 x 80 6 M16 x 80 10 M16 x 80 12
Table 2. Frame group parts.

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6. Mounting the boilers on the frame
All lines/piping must be mounted free of tension. The weight of all the components should be supported
separately from the boiler so there is no force on the connections. This might influence the mounting position
of the boiler.
Before mounting the boiler on the frame, ensure that the frame is level in both directions. If necessary adjust
with the adjusting bolts on the lower side of the frame (see drawing).
After mounting the boiler on the frame, ensure that the boiler is level. If necessary adjust with the adjusting
bolts on the lower rear side of the back panel. (see drawing).
When the adjusting bolts aren’t sufficient, one needs to fill behind the bolts to get the boiler level. The
levelling margin is between boiler hanging level, and hanging backwards a little.
The boiler should not lean forward in the mounted position.
Lock the suspension bracket with the locking strip to prevent the boiler from falling off the bracket
(see drawing).
Figure 5. Mounting details.
Levelling frame
Locking
Levelling boiler

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7. Mounting the connecting sets
First connect the connecting sets hand-tight to the boiler connections. In a cascade set-up, do NOT use the
T-pieces delivered with the boilers.
The shortest connecting set should be connected to the gas connection on the boiler.
Make sure to connect the flow connecting set (middle length) to the boiler flow connection (left-side
connection) and the return connecting set (longest) to the boiler return connection (right-side connection).
The open connection in the flow connecting set is meant for a pressure relief valve, and the one in the return
connecting set is to be used for a boiler bleeding valve.
NOTICE: For the S-CB PX 120 boiler the return connecting set differs, because of the external pump.
Flow connecting set Return connecting set
Gas connecting set
Connection to boiler
Connection for
pressure relief valve
Ball valve
Coupling to flow
header
Connection to boiler
Connection for boiler
bleed valve
Check valve
Ball valve
Coupling to return
header
Connection to boiler
Gas isolator
Coupling to gas
header
S-CB PX boiler with
external pump:
Connection to
boiler
Pump location
Connection for
boiler bleed valve
Check valve
Ball valve and
coupling to return
header
Figure 6. Connecting sets.

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Connecting sets for boilers S-CB+ 60 – 120 and S-CB PX 120
NOTICE: Return set for the S-CB PX 120 differs from S-CB+120
Connecting set part.no. 1
boiler
2
boilers
3
boilers
4
boilers
Connecting set gas = ¾" E04.000.377 1x 2x 3x 4x
Flow connecting set = 1" E04.000.373 1x 2x 3x 4x
Return connecting set
S-CB+ = 1" E04.000.374 1x 2x 3x 4x
Return connecting set
S-CB PX = 1" E04.000.417 1x 2x 3x 4x
Connection size relief valve and bleed valve: Both Rp 1"
Connecting sets for boilers S-CB+ 150 – 180
Connecting set part.no. 1
boiler
2
boilers
3
boilers
4
boilers
5
boilers
6
boilers
Connecting set gas = 1" E04.000.378 1x 2x 3x 4x 5x 6x
Flow connecting set = 1¼" E04.000.375 1x 2x 3x 4x 5x 6x
Return connecting set = 1¼" E04.000.376 1x 2x 3x 4x 5x 6x
Connection size relief valve and bleed valve: Both Rp 1¼"
Table 3. NB!  Part numbers are corresponding to one connecting set, so order the correct quantity of sets.

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8. Mounting the hydraulic group
Connect the gas header to the gas connecting sets.
Connect the flow header to the flow connecting sets.
Connect the return header to the return connecting sets.
Mount all headers with the clamps to the frame.
All lines/piping must be mounted free of tension.
The weight of all the components should be supported separately of the boiler so there is no force on the
connections.
This might influence the mounting position of the boiler.
When all parts are mounted in the right place, and are free of tension, fasten all couplings and fasten the
clamps.
Figure 7. Hydraulics.

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8.1 Hydraulic group for 2 boilers S-CB+ 60–120 and/or S-CB PX 120
Connecting sets in the picture are S-CB+ versions.
Hydraulic group for: 2 Boilers 60–120
E00.000. 152
No. Description Part number Q
1 Gas header E02.025.014 1
2 Flow header E02.032.006 1
3 Return header E02.032.007 1
4 Clamp gas header E01.000.205 2
5 Clamp flow/return header E01.000.208 4
6 Seal cap gas header E04.005.083 1
7 Seal cap flow/return header E04.005.061 2
8 Coupling (2-parts) E04.002.078 2
9 Gasket for coupling E07.003.059 2
10 Bolt + nut + washer M10 x 35 24
3
2
1
510
5
89
7
5
4
5
7
10
10
4
6
10
89

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8.2 Hydraulic groups for 3 and 4 boilers S-CB+ 60–120 and/or S-CB PX 120
Connecting sets in the picture are S-CB+ versions.
Hydraulic group for: 3 Boilers 60–120
E00.000.186
4 Boilers 60–120
E00.000.154
No. Description Part no. Q Part no. Q
1 Gas header E02.032.008 1 E02.027.018 1
2 Flow header E02.039.011 1 E02.028.061 1
3 Return header E02.039.012 1 E02.028.060 1
4 Clamp gas header E01.000.208 2 E01.000.209 3
5 Clamp flow/return header E01.000.210 4 E01.000.211 6
6 Seal cap gas header E04.005.061 1 E04.005.058 1
7 Blind flange for flow/return
header E04.010.182 2 E04.010.180 2
8 Gasket for flange E07.003.071 4 E07.003.072 4
9 Bolt + nut + washer M12 x 60 16 M16 x 60 16
10 Bolt + nut + washer M10 x 35 24 M10 x 35 36
1
2
3
4
5
5
10
8
9
8
5
7
9
9
7
6
4
10

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8.3 Hydraulic groups for 2 and 3 boilers S-CB+ 150–180
Hydraulic group for: 2 Boilers 150–180
E00.000.155
3 Boilers 150–180
E00.000.156
No. Description Part no. Q Part no. Q
1 Gas header E02.027.019 1 E02.027.017 1
2 Flow header E02.039.009 1 E02.028.056 1
3 Return header E02.039.010 1 E02.028.057 1
4 Clamp gas header E01.000.206 2 E01.000.206 2
5 Clamp flow/return header E01.000.210 4 E01.000.211 2
6 Seal cap gas header E04.005.058 1 E04.005.058 1
7 Blind flange for flow/return
header E04.010.182 2 E04.010.180 2
8 Gasket for flange E07.003.071 4 E07.003.072 4
9 Bolt + nut + washer M12 x 60 16 M16 x 60 16
10 Bolt + nut + washer M10 x 35 24 M10 x 35 24
5
10
3
2
1
9
9
9
8
6
4
7
9
4
5
5
8
7
5

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8.4 Hydraulic group for 4 boilers S-CB+ 150–180
Hydraulic group for: 4 Boilers 150–180
E00.000.157
No. Description Part no. Q
1 Gas header E02.028.058 1
2 Flow header E02.031.005 1
3 Return header E02.031.006 1
4 Clamp gas header E01.000.207 3
5 Clamp flow/return header E01.000.212 6
6 Blind flange for gas header E04.010.180 1
7 Gasket for flange E07.003.072 1
8 Blind flange for flow/return header E04.010.183 2
9 Gasket for flange E07.003.073 4
10 Bolt + nut + washer M16 x 60 20
11 Bolt + nut + washer M10 x 35 36
11
5
9
10
1
3
2
8
10
5
10
5
4
6
10
4
9
5
7
9
11
4