Viessmann 7560749 is a common low water cutoff device interface designed to interconnect individual manifold-mounted boilers with a common low water cutoff device. It facilitates the safe operation of multiple boilers by ensuring that they all respond to a low water condition in a coordinated manner. With its simple installation process and clear instructions, this device provides an effective solution for enhancing the safety and reliability of boiler systems.
Viessmann 7560749 is a common low water cutoff device interface designed to interconnect individual manifold-mounted boilers with a common low water cutoff device. It facilitates the safe operation of multiple boilers by ensuring that they all respond to a low water condition in a coordinated manner. With its simple installation process and clear instructions, this device provides an effective solution for enhancing the safety and reliability of boiler systems.
Installation and Operating
Instructions
5674 276 - 03 10/2021
Common Low Water Cutoff Device Interface
Part No. 7560749
For use with: Vitodens 200-W (when used with a Viessmann low loss distribution manifold)
Please file in Service Binder
Refer to the Installation Instructions
applicable to this boiler.
Ensure that main power to the equipment being serviced
is off.
Ensure that the main fuel supply valve to the boiler is
closed.
Take precautions to avoid accidental activation of power
or fuel during service work.
Do not perform service work on any component part
without ensuring safe operation of the heating system.
When replacing parts, use original Viessmann or
Viessmann approved replacement parts.
Safety and Installation Requirements
Please ensure that these instructions are read and
understood before starting any service work. Failure
to comply with these instructions may cause product/
property damage, severe personal injury and/or loss of life.
Working on the equipment
The installation, adjustment, service and maintenance of
this product must be performed by a licensed professional
heating contractor who is qualified and experienced in
the installation, service, and maintenance of hot water
boilers. There are no user serviceable parts on the boiler,
burner or control.
for use by heating contractor
Read and save these instructions
for future reference.
IMPORTANT
LR102874
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
2
General Information
About these Instructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product
information. These include “WARNING”, “CAUTION”, and “IMPORTANT”. See below.
IMPORTANT
Warnings draw your attention to the presence of
potential hazards or important product information.
Cautions draw your attention to the presence of
potential hazards or important product information.
Helpful hints for installation, operation or maintenance
which pertain to the product.
WARNING
Indicates an imminently hazardous situation which,
if not avoided, could result in loss of life, serious injury
or substantial product/property damage.
CAUTION
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product/
property damage.
Refer to the applicable Vitodens 200-W manuals for
specific information.
Important Regulatory and Installation Requirements
Codes
The installation of this unit must be in accordance
with local codes. All electrical wiring is to be done in
accordance with the latest edition of CSA C22,1 Part 1
and/or local codes. In the U.S. use the National Electrical
Code ANSI/NFPA 70. The heating contractor must comply
with the Standard of Controls and Safety Devices for
Automatically fired Boilers, ANSI/ASME CSD-1 where
required by the authority having jurisdiction.
Working on the equipment
The installation, adjustment, service and maintenance of
this unit must be done by a licensed professional heating
contractor who is qualified and experienced in the
installation, service, and maintenance of hot water
heating boilers. There are no user serviceable parts on
the boilers or control.
Power supply
Install power supply in accordance with the regulation of
the authorities having jurisdiction or in absence of such
requirements, in accordance with National Codes.
Viessmann recommends the installation of a disconnect
switch in the 120VAC power supply outside of the boiler
room.
Please carefully read this manual prior to attempting
installation, Any warranty is null and void if these
instructions are not followed.
For information regarding other System Technology
componentry, please reference documentation of the
respective product.
We offer frequent installation and service seminars
to familiarize our partners with our products. Please
inquire.
The completeness and functionality of field supplied
electrical controls and components must be verified
by the heating contractor. These include low-water
cut-offs, flow switches (if used), staging controls,
pumps motorized valves, air vents, thermostats, etc.
WARNING
More than one live circuit. See wiring diagram in this
manual. Turn off power supply to control and damper/
blower before servicing. Contact with live electrical
components can result in serious injury or death.
Purpose of Device
The propose of this unit is to interconnect the individual
manifold mounted boiler and a common low water cutoff
device interface.
IMPORTANT
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Common Low Water Cutoff Device Interface Connection
Installation
1. Mount the common low water cutoff device interface
in a common area to the boilers.
2. The interface device requires 120/1/60 12A external
power supply. Connect the incoming 120VAC to the
three pole terminal strip located on the PCB.
The junction box is equipped with knockouts to allow
BX and conduit connections.
3. Refer to the low water cutoff documentation to
ensure the correctly sized fuse is selected during
installation.
4. Provide disconnect means and over-current protection
as required by code requirements.
IMPORTANT
Refer to local codes and/or regulations with respect to
providing electrical disconnect for the low water cutoff,
and LWCO device interface.
WARNING
There is more than one live circuit. See boiler wiring
diagram in this manual. Turn off power supply to control
LWCO and common LWCO device interface before
servicing. Contact with live electrical components can
result in serious injury or loss of life.
CAUTION
When making connections with individual boilers,
ensure the power is turned off at the boiler control.
Installation
3
4
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Installation
Low water cutoff device connection
Specifications:
Rated Voltage: 120VAC
Current Rating: 5A maximum
1. Low water cutoff device connection.
IMPORTANT
IMPORTANT
Refer to the common low water cutoff device manual for
current rating to properly size the fuse.
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
Common Low Water Cutoff Device Interface Connection (continued)
Legend
A Common low water cutoff device interface
B Low water cutoff
5
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Installation
Common Low Water Cutoff Device Interface Connection (for B2HA/B 1-4 Boilers)
Boiler interconnections
The drawing below shows interconnections between
common low water cutoff device interface and the
individual boilers.
1. Remove jumper installed at the connection
terminal 1 and L of the boiler.
2. Connect the multi terminal of the common Low Water
cutoff device interface to the multi connection of
the individual boiler terminals 1 and L. Terminals 1
and L cannot be interchanged.
IMPORTANT
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
Refer to applicable Vitodens 200-W manuals for detailed
operating information.
IMPORTANT
Legend
A Connection to B2HA/B boiler 1 Electrical Junction Box
B Connection to B2HA/B boiler 2 Electrical Junction Box
C Connection to B2HA/B boiler 3 Electrical Junction Box
D Connection to B2HA/B boiler 4 Electrical Junction Box
E Common low water cutoff device interface
IMPORTANT
Multi terminal in boiler electrical junction box is 120VAC.
Multi
Note: All cables and wires are field supplied.
6
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Installation
Common Low Water Cutoff Device Interface Connection (for B2HE 1-4 Boilers)
Boiler interconnections
The drawing below shows interconnections between
common low water cutoff device interface and the
individual boilers.
1. Connect the multi terminal of the common Low Water
cutoff device interface to the ZI1 connection of
the individual boilers.
IMPORTANT
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
Refer to applicable Vitodens 200-W manuals for detailed
operating information.
IMPORTANT
Legend
A Connection to B2HE boiler 1 (MZIO)
B Connection to B2HE boiler 2 (MZIO)
C Connection to B2HE boiler 3 (MZIO)
D Connection to B2HE boiler 4 (MZIO)
E Common low water cutoff device interface
IMPORTANT
Multi terminal in boiler electrical junction box is 120VAC.
Note: All cables and wires are field supplied.
7
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Connecting Two Common Low Water Cutoff Device Interface
1. Follow the connection instructions for the common
low water cutoff device interface shown on pages
3 and 4. These connections are made to the primary
common low water cutoff device interface only.
2. Connect the ‘NO’ switching contact terminal (closest
to the low water cutoff device power supply) from
the primary common low water cutoff device
interface to the ‘NO’ switching contact terminal
(closest to the low water cutoff device power supply)
of the secondary common low water cutoff device
interface (as shown).
3. Connect the ‘N’ (neutral) power supply terminal from
the primary common low water cutoff device interface
to the ‘N’ (neutral) power supply terminal of the
secondary common low water cutoff device interface
(as shown).
Interface Interconnections
The drawing shows interconnections between two
common low water cutoff device interface used when
connecting common low water cutoff device interface
for 5 to 8 boilers.
Legend
A Primary common low water cutoff device interface
B Secondary common low water cutoff device interface
C Low water cutoff device (typical)
Installation
8
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Common Low Water Cutoff Device Interface Installation and Operating
8
Common Low Water Cutoff Device Interface Connections (for B2HA/B 5-8 Boilers)
Legend
A Primary common low water cutoff device interface
B Secondary common low water cutoff device interface
C Low water cutoff device
D Vitodens 200-W B2HA/B boilers installed on a low loss distribution manifold
Note: Interconnections are field supplied wiring. No factory supplied harness is available.
Installation
Boiler connections
This drawing shows interconnections between common
low water cutoff device interface and the individual boiler
control electrical connection boxes.
IMPORTANT
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
9
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Common Low Water Cutoff Device Interface Connections (for B2HE 5-8 Boilers)
Legend
A Primary common low water cutoff device interface
B Secondary common low water cutoff device interface
C Low water cutoff device
D Vitodens 200-W B2HE boilers installed on a low loss distribution manifold
Note: Interconnections are field supplied wiring. No factory supplied harness is available.
Installation
Boiler connections
This drawing shows interconnections between common
low water cutoff device interface and the individual boiler
control electrical connection boxes.
IMPORTANT
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
10
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Installation
Common Low Water Cutoff with Boiler Low Gas Pressure Switch (B2HA/B)
Boiler interconnections
The drawing below shows interconnections between
common low water cutoff device interface and the
individual Vitodens 200-W B2HA/B series boilers, when
the boiler is equipped with a low gas pressure switch.
1. Install the low gas pressure switch in series with the
common low water cutoff on the ‘L’ terminal, repeat
for all boilers connected to the common low water
cutoff.
IMPORTANT
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
Refer to applicable Vitodens 200-W manuals for detailed
operating information.
IMPORTANT
Legend
A Connection to B2HA/B boiler 1
B Connection to B2HA/B boiler 2
C Connection to B2HA/B boiler 3
D Connection to B2HA/B boiler 4
E Common low water cutoff device interface
F Low gas pressure switch
G Boiler junction box
H Low water cutoff
IMPORTANT
Multi terminal in boiler electrical junction box is 120VAC.
Note: All cables and wires are field supplied.
11
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Sequence of Operation (B2HA/B)
1. Upon low water condition the switching contact in the
low water cutoff device will break contact opening
the NO/NO contacts, this will break the 1/L contacts
to each of the boilers connected to the common
LWCO device interface causing a shut down of the
boiler.
IMPORTANT
Opening of the “NO” connection at common low water
cutoff device interface or opening of the 1/L connection
of the individual boiler will cause the boiler to shut down.
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
IMPORTANT
Operating
2. During low water, the condition the boilers will not
display a Fault code. Access coding level 2, enter
the ‘Boiler’ submenu and scroll to coding address 38.
If coding address 38:29 is displayed, reset the LWCO.
To restart the boiler, reset the LWCO. Return to the
home screen and access coding level 2, enter the
‘Boiler’ submenu and scroll to coding address 38.
Coding address 38 should now display 38:0. If coding
address 38:29 continues to be displayed, verify the
low water condition has been rectified.
3. Once the low water condition has been rectified,
the NO/NO contacts will close, closing the 1/L
contacts to the individual boilers. Boilers will
resume normal operation.
For details on accessing coding levels, refer to
Vitodens Service Instructions
For testing procedure refer to the installation
instructions of the LWCO
5674 276 - 03
Common Low Water Cutoff Device Interface Installation and Operating
Sequence of Operation (B2HE)
1. Upon low water condition the switching contact in the
low water cutoff device will break contact opening
the NO/NO contacts, this will break the low water
cutoff signal to each of the boilers connected to the
common LWCO device interface causing a shut down
of the boiler.
IMPORTANT
Opening of the “NO” connection at common low water
cutoff device interface will cause the boiler to shut down.
Once installation has been completed, ensure all
connected components are tested for proper operation
and functionality.
IMPORTANT
Operating
2. During low water, condition the boilers will display a
Fault code.
3. Once the low water condition has been rectified,
the NO/NO contacts will close, low water cutoff
signal to the individual boilers. Boilers will resume
normal operation and the fault display will terminate.
For details on accessing coding levels, refer to
Vitodens Service Instructions
For testing procedure refer to the installation
instructions of the LWCO
Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.
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Viessmann 7560749 is a common low water cutoff device interface designed to interconnect individual manifold-mounted boilers with a common low water cutoff device. It facilitates the safe operation of multiple boilers by ensuring that they all respond to a low water condition in a coordinated manner. With its simple installation process and clear instructions, this device provides an effective solution for enhancing the safety and reliability of boiler systems.
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