Strebel Ca 7s User manual

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23/03/01
Ca 7s and BCa 7s
61-235 kW
INSTALLATION AND
OPERATING
INSTRUCTIONS

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CONTENTS:
Dimensions for Ca7s and BCa7s boilers.
General specification
Boiler room clearance requirements
Boiler block assembly
Pulling up the sections
Boiler block assembly & connections
Ca7s Jacket assembly
Calorifier assembly
BCa7s Jacket assembly
Continued
Electrical connection and Instrument control panel
Continued
Control module options
Control module diagrams
Installation of electronic control modules
Terminal wiring diagram
Schematic wiring diagram
Important notes & burner connection information.
PAGE:
3 & 4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

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General Specifications
The STREBEL Camino 7s is a special boiler for oil or
gas fired pressure jet burner.
In the BICALOR construction a calorifier for the
supply of hot water is built onto the boiler.
CSH-S type calorifiers are manufactured from 1.4571
high tensile steel with an incorporated heating coil of
galvanised copper ribbed pipe.
Triple pass block of cast iron sections.
The first pass is the combustion chamber. From there
the flue gases pass between the rear section and the last
intermediate section through the second pass to the
front of the boiler. They are then diverted into the third
pass and flow back to the rear through the flue spigot
into the chimney.
Flue baffles of cast iron can be introduced into the flue
passes in order to influence the flue gas temperature
depending on chimney conditions.
The boiler can be used with an oil or gas burner.
Brief description.
•Corrosion resistant block of cast iron sections.
•Triple pass boiler with optimised use of energy.
•High efficiency.
•Built-in instrument panel with multiple control
possibilities and retro-fit control options.
•Easy erection and cleaning.
•Modern design.
Operating conditions
Boiler:
Maximum operating temperature up to 110ºC
Maximum operating temperature up to 120ºC
depending on technical safety of the equipment.
Maximum operating pressure 4.0 bar
Maximum test pressure 5.2 bar
Min thickness = 60mm
A B
Ca 7s-4 965 810
Ca 7s-5 1115 810
Ca 7s-6 1265 810
Ca 7s-7 1415 810
Ca 7s-8 1565 810
Ca 7s-9 1715 810
Ca 7s-10 1865 810
Dimensions
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
Calorifier:
Maximum operating pressure 10 bar
Maximum test pressure 13 bar
The boiler can be delived in individual sections
or as a boiler block. The accessories are packed
seperately. There are different orders of
assembly depending on the condition of supply.
when assembling and connecting the boiler, all
relevant instructions should be observed.
The boiler is to be erected on a base, or a level
floor which is capable of supporting the weight
of the boiler, water content and any ancillary
equipment. Refer to base details opposite.
Assembly, connections and the initial set-up
operation should be carried out by a qualified
heating engineer.

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
Boiler Dimensions
Ca 7s - Dimensions
Boiler LK mm Tmm
Ca7s-4 865 555
Ca7s-5 1015 705
Ca7s-6 1165 855
Ca7s-7 1315 1005
Ca7s-8 1465 1155
Ca7s-9 1615 1305
Ca7s-10 1765 1455
KEY:
1.1 Boiler Flow 130mm NW65
2.1 Boiler Return 130mm NW65
35.1 Boiler Drain 3/4”

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
BCa 7s - Dimensions
LK Calorifier Type CSH-
Boiler 240S 300S 360S 500S
LK mm mm mm mm mm
Ca7s-4 865 1175
Ca7s-5 1015 1175 1475
Ca7s-6 1165 1475 1625
Ca7s-7 1315 1475 1625 2075
Ca7s-8 1465 1625 2075
Ca7s-9 1615 2075
Ca7s-10 1765 2075
1.1 Boiler flow 130mm NW65
2.1 Boiler return 130mm NW65
10 Primary pump 1x230V 1¼”
33 Primary connection pipe (1¼”*) 1½”
34 Return connection pipe (1¼”*) 1½”
35 Air vent 3/8 “
35.1 Boiler drain off ¾”
35.2 HWS drain off ¾”
38 HWS water connection flow (1½”*) 2”
39 Cold water connection (1½”*) 2”
40 Circulation connection ¾”
44.1 Non return valve
* Available for calorifier CSH 240S
KEY:

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Diagram showing clearances required in boiler room.
The clearance details shown above are required for access to the boilers for maintenance purposes. Slight
variations may apply, depending on the specific installation.
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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Once assembled, the boiler block is to be secured with
the tie bars (2 at the top, and 2 at the bottom). Prior to
screwing nuts up ensure the two disc springs (5)&(6)
are slotted on with concave sides facing each other.
The nuts can now be tightened until the disc springs
flatten.
The burner door hinges should now be fitted on the
left or right hand side of the front section depending
on requirements. Ensure the eyelet screws (door
hinge) are at the same depth and when the door is
closed it should press flat with the front section.
Boiler Block Assembly
The boiler block is assembled by ‘pulling-up’ each
section in turn starting from the rear section (1). All
other sections (2)(3)(4) are mounted individually
using the pulling-up tools.
One face of the adjoining sections must have a length
of mastic sealing strand placed into the mastic groove.
Each of the boiler nipples must be inspected to ensure
there is no damage apparent. The nipples and nipple
ports should then be kept free from dirt and checked
at each stage of assembly. Particles of dirt which are
not removed lead to leakage.
The accompanying nipple jointing oil serves as a
lubricant as well as a waterproof seal and must be
used.
Boiler nipples and nipple ports must align exactly at
all stages of assembly. An inclined, retracted nipple
leads to leakage.
The clearance between the sections throughout the
pulling-up stages should always be even. If the
clearance is uneven, a flat chisel should be inserted
into the narrower point and the sections pulled up
until the clearance is even again.
Diagram showing nipple & boring
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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Rear and Intermediate sections Pulling-up Bars
Pulling-upBrass nut &
2 x M20 Pulling-up M20 Steel nut
Locate nipples into nipple ports and take up slack
Pulling-up flange
1st Intermediate
section
Pulling-up
Brass
Brass
Rear
Spanner
Flange
Tighten flanges alternately until faces are touching.
Blanking Flange
Blanking Flange
Tie bar M12
Tie bar M20
Cast lug for tie bar
Once the boiler block is pulled up use the tie bars to secure as shown
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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Cold water pressure test:
The assembled boiler is to be subjected to a cold
water pressure test of 1.5 times the operating pressure.
The maximum test pressure of the boiler is 5.2 bar.
In addition, at the time of testing for water pressure,
no pressure control fittings or safety fittings may be
assembled which cannot be separated from the water
area of the boiler.
Only fill, slowly from the bottom via the filling and
draining cock.
Ventilate during the filling procedure from time to
time, until the water emerges.
If a nipple connection is leaking then drain off the
water via the filling and draining cock. Separate by
driving flat wedges around the perimeter of the join
between sections. New nipples MUST be used for re-
assembly.
Assemble and repeat test.
The order of assembly from (1) to (7) must be
observed.
Important points:
•When fitting the long injection tube (1) (only
fitted to boilers with 7 sections or more) care
should be taken to ensure that the holes for the
direction of water, are facing upwards.
•The boiler flow (3) must be assembled with the
connection facing upwards eccentrically.
•The boiler return (2) must be assembled with the
connection facing downwards eccentrically.
•It is possible to hinge the door to swing from
either side of the front section. Car should be
taken to ensure the burner plug is mounted
accordingly.
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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The order of assembly from (1) to (13) must be
observed.
Important points:
When assembling the floor insulation (1) as well as
the side jackets (2) care should be taken to ensure they
are in the correct position (with burner cable holes
facing the front).
The water temperature sensors (9) must be pushed
with the pressure spring into the immersion sleeves
(max. 3 per sleeve) and then secured with the
protective guard.
Note: The sensor leads (capillary tubes) should not
be kinked.
The jacket assembly should be in the following order:
1. Insulation under the boiler both left and right.
2. Boiler side jackets left and right.
3. Rear bottom bracing angle.
4. Front bracing bracket.
5. Rear inner insulation.
6. Position burner cable according to door hinging.
7. Position instrument control panel.
8. Mount control panel to mounting bracket.
9. Mount sensors in sensor pockets.
10. Top jacket.
11. Outer rear insulation.
12. Fit insulation retainer.
13. Fit flue over cast spigot on rear section (using
rubber mallet and block of wood).
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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Calorifier assembly and connections:
1. Injector tubes (Note: Ensure the holes for the
direction of water are facing upwards.
2. Header for the return connection to calorifier.
3. Header for the flow connection to the
calorifier.
4. Calorifier mounting bracket.
5. Calorifier.
6. Pipework to calorifier (flow).
7. Pipework to calorifier (return).
8. Blank flange for return connection.
9. Blank flange for flow connection.
10. Reflector plate.
11. Injector tube.
Boiler block showing calorifier
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
BCa7s Jacket assembly
Follow the steps below for completion of the jacket assembly.

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23/03/01
ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
The jacket assembly is completed by following the steps
below:
•The sensors (4) must be pushed into the sensor pockets at
the rear of the boiler (max. of 3 per pocket)
•The calorifier control thermostat sensor (5) must be pushed
into the lower sensor pocket with the retaining spring.
•The calorifier thermometer (6) must be pushed into the
upper sensor pocket.
•All sensor leads (capillary leads) must not be kinked.
Note:
Mains connection should be
made via the rear of the boiler
through to the control panel. It
must not be connected directly
to the front of the boiler via
the calorifier jacket door.

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
Instrument Control Panel Description
Key:
A. Power On / Off switch.
B. Burner lock-out indicator. (RED) - The red lamp will illuminate if the burner has gone to lock-out.
C. High limit indicator. (ORANGE) - Illuminates if the high limit thermostat is activated. Has to be
manually reset by removing cap from STB reset, and press button.
D. High Limit Test Switch. (STB) - Overrides the control thermostat to enable limit thermostat test.
E. Boiler Thermometer– Shows the actual boiler water temperature and has no influence on boiler
temperature control.
F. HWS Thermometer - Shows temperature of the HWS calorifier. (B2B version only)
G. Hours Run Meter (blanked as standard) Burner Stage 1 - Shows running time of the stage 1 burner
operation.
H. Hours Run Meter (blanked as standard) Burner Stage 2 - Shows running time of the stage 2 burner
operation.
I. Frequency of Switching Meter for Stage 1. (blanked as standard).
J. Frequency of Switching Meter for Stage 2. (blanked as standard).
K. Summer / Winter Switch - For switching boiler between modes to supply HWS only in the summer
period.
L. Calorifier Control Thermostat - Set for the required hot water temperature (60ºC Max.)
M. Control Thermostat - Stage 1.
N. Control Thermostat - Stage 2.
O. Boiler Safety Limit Thermostat (STB) - Manual reset. Used when the boiler water temperature
overheats. The water in the boiler must cool to around 80ºC, to enable reset. (refer to point “C”
above).
P. Fuse (6.3A) - Protection for all the controls and any ancillary equipment connected back to the
control panel. A defective fuse MUST be replaced with an identical one.
ATTENTION: Before a fuse is replaced, the instrument control panel must be isolated.

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
B2B Panel
K2B Panel
The diagrams opposite shows connections to the
instrument control panel.
Key:
1. Burner Cables
2. Power Supply Connection.
3. Stage 1 & Stage 2 Thermostat Sensor & boiler
Thermometer Sensor Pockets.
4. Calorifier Thermostat Sensor Pocket.
5. Calorifier Thermometer Sensor Pocket.

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
K2B Connections
Supply 230V / 50Hz
K2B Electrical Connections
*
Legend
1. Instrument Control Panel.
2. Separate Calorifier Control.
4. Separate Calorifier Circulating Pump.
9. Boiler Shunt Pump.
26. Flue Gas Damper.
28. Safety Solenoid Valve.
29. High Limit Thermostat.
30. Calorifier Control Thermostat.
DIN 4791 - Weiland Connector
(7-way for stage 1 burner operation).
DIN 4791 - Additional Weiland Connector.
(4-way for use with Hi/Low Burners).
A. Power Supply 230V / 50Hz
B. Burner Connections. (Plug and Socket Looms).
K. Boiler Circulating Pump Interlock.
W. Flue Gas Damper Interlock.
X. Safety Solenoid Valve Interlock.
Y. Calorifier Thermostat Interlock.
Z. Provision for Remote High Temperature Limit
Indication.
D1. Calorifier Instrument Control Panel Connection.
D2. Calorifier Circulating Pump Connection.
* Provision for Remote Switching of Burner.
(terminals 8a & 8b).

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
B2B Instrument Control Panel Connections
B2B Electrical Connections
Supply 230V / 50Hz
*
Legend
1. Instrument Control Panel.
3. Calorifier Circulating Pump.
9. Boiler Shunt Pump (where applicable)
26. Flue Gas Damper. (where applicable)
28. Safety Solenoid Valve. (where applicable)
29. High Limit Indication.
30. Calorifier Control Thermostat.
DIN 4791 - Weiland Connector.
(7-way for stage 1 burner operation).
DIN 4791 - Additional Weiland Connector .
(4-way for use with Hi/Low Burners).
A. Power Supply 230V / 50Hz
B. Burner Connections. (Plug and Socket Looms).
C. Calorifier Primary Circulating Pump.
K. Boiler Circulating Pump Interlock.
W. Flue Gas Damper Interlock.
X. Safety Solenoid Valve Interlock.
Y. Calorifier Thermostat Interlock.
Z. Provision for Remote High Temperature Limit
Indication.
* Provision for Remote Switching of Burner.
(terminals 8a & 8b).

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
Legend:
1.1 Power Switch ON/OFF. 1.2 Summer / Winter Switch. 1.3 High Limit STB Test Switch. 1.4 Boiler Limit Thermostat. 1.5 Boiler Thermostat Stage 1. 1.6 Boiler Thermostat Stage 2. 1.8 Hours Run Meter Stage 1. 1.8a Frequency of Switching Stage 1 (optional). 1.9 Hours Run Meter Stage 2. 1.9a Frequency of Switching Stage 2 (optional). 1.14 Boiler Limit Thermostat (for operation at 110ºC (optional extra). 1.20 Burner Lock-out Lamp 1.21 High Limit Lamp. 1.23 Fuse 6.3A.
K2B Instrument Control Panel - Internal Wiring Diagram

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
Legend:
1.1 Power Switch. 1.2 Summer / Winter Switch. 1.3 High Limit STB Test Switch. 1.4 Boiler Limit Thermostat. 1.5 Boiler Thermostat Stage 1. 1.6 Boiler Thermostat Stage 2. 1.7 Calorifier Thermostat. 1.8 Hours Run Meter Stage 1. 1.8a 1.9 Hours Run Meter Stage 2. 1.9a 1.14 1.20 Burner Lock-out Lamp 1.21 High Limit Lamp. 1.23 Fuse 6.3A.
Legend:
1.1 Power Switch ON/OFF. 1.2 Summer / Winter Switch. 1.3 High Limit STB Test Switch. 1.4 Boiler Limit Thermostat. 1.5 Boiler Thermostat Stage 1. 1.6 Boiler Thermostat Stage 2. 1.7 Calorifier Thermostat. 1.8 Hours Run Meter Stage 1. 1.8a Frequency of Switching Stage 1 (optional). 1.9 Hours Run Meter Stage 2. 1.9a Frequency of Switching Stage 2 (optional). 1.14 Boiler Limit Thermostat (for operation at 110ºC (optional extra). 1.20 Burner Lock-out Lamp 1.21 High Limit Lamp. 1.23 Fuse 6.3A.
B2B Instrument Control Panel - Internal Wiring Diagram

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ASSEMBLY INSTRUCTIONS FOR: Ca 7s / BCa 7s
When connecting the burner, make sure the length of the burner cable is
such that when the burner door is opened it becomes disconnected.
IMPORTANT:
Flue-gas temperatures of below 160ºC can lead to
sooting of the flue, when entering a stone or brick
chimney. Where flue-gas temperatures are below
160ºC gross, specially adapted chimneys must be
available. If after the burner has been set, the flue-gas
temperature is too low, the baffles from the 3rd flue
pass can be taken out. If necessary, the 2nd flue pass
baffles can also be removed.
NB: Every change made to the flue baffles requires
re-commissioning of the burner settings.
Electrical connections must be carried out by qualified
personnel in accordance with instructions supplied.
Electrical leads and oil pipes should never be fastened to
the boiler casing.
In the interest of technical progress, we reserve the right
to undertake changes and improvements in production
without notification.
Please refer to ‘Operating and Maintenance’ information
for details on baffles and control panel information.