Viessmann 7946564 Combustion Air Intake Adaptor Kit enables the use of an external combustion air source for Viessmann Vitocrossal 200 CI2 boilers, enhancing safety and efficiency. It prevents combustion air from being drawn from the room where the boiler is installed, ensuring a reliable air supply for optimal boiler operation.
Viessmann 7946564 Combustion Air Intake Adaptor Kit enables the use of an external combustion air source for Viessmann Vitocrossal 200 CI2 boilers, enhancing safety and efficiency. It prevents combustion air from being drawn from the room where the boiler is installed, ensuring a reliable air supply for optimal boiler operation.
Installation Instructions
6178 722 - 01 10/2021
Combustion Air
Intake Adaptor Kit
Please file in Service Binder
Refer to the Installation Instructions
applicable to this boiler.
Preparing the Boiler (CI2 399 to 1000)
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.
CI2 399, 500, 750, 1000
for use with Vitocrossal 200 CI2 Boilers
Part # 7946564, 399/500
Part # 7946563, 750/1000
Part # 7946562, 1500
Part # 7946561, 2000
for use by heating contractor
1. Shut off and disconnect the boiler power supply.
2. Push back top panels to access the front panel release
(top panel removal is not required).
3. Using a screwdriver push down on the front panel
releases.
4. Pull forward at the top of the front panel and lift up
to remove.
2
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Removing the Air Intake Tube (CI2 750/1000)
Routing the Flexible Air Intake Tube (CI2 399 to 1000)
1. For Vitocrossal 200 CI2 models 750/1000,
remove burner air intake tube.
1. Route flexible combustion air intake tube under the
right side of the boiler out the rear jacketing cut out.
3
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Installing the Burner Adaptor (CI2 399 to 1000)
CI2 399/500
CI2 750/1000
Installing the Retaining Bracket (CI2 399 to 1000)
CI2 399/500
1. Apply sealing tape to the burner air inlet.
2. Mount the burner adapter to the burner and secure in
place with a hose clamp.
3. Secure the flexible combustion air inlet tube to the
burner adaptor with a hose clamp.
1. Mount the burner adapter to the flange at the base
of the burner.
2. Secure in place with supplied hardware.
3. Secure the flexible combustion air inlet tube to the
burner adaptor with a hose clamp.
1. Install the combustion air inlet bracket to the
combustion air inlet restraint.
2. Using the supplied clamp, secure the flexible
combustion air inlet tube to the rigid adaptor.
3. For the CI2 399/500 models only, install the reducing
coupling to the rigid adaptor.
4. Secure the combustion air inlet brackets to the boiler.
4
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Closing the Boiler (CI2 399 to 1000)
CI2 399, 500, 750, 1000
Preparing the Boiler (CI2 1500/2000)
CI2 1500/2000
1. Place the bottom of the front panel on the front sill.
2. Push in the top of the front panel until you hear a click.
3. Pull back the top panels.
1. Shut off and disconnect the boiler power supply.
2. Flip up the handle in the top panel.
3. Using the handle, pull straight up.
4. Using a screw driver, push in on the panel retaining
clip while pulling up on the handle to remove the panel
(the location is donated by an up arrow in the panel).
5. Using a screwdriver push down on the front panel
release.
6. Pull forward at the top of the front panel and lift up
to remove.
5
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Removing the Burner Inlet Tube (CI2 1500/2000)
Removing the Retaining Panel (CI2 1500/2000)
CI2 1500/2000
Remove burner inlet tube from 1000 MBH burners.
Note: the CI2 2000 is equipped with two 1000 MBH
burners.
1. Remove the screws from the front retaining panel.
2. Slide down front retaining panel to remove.
6
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Installing the Burner Adaptors (CI2 1500/2000)
Positioning the Combustion Air Pan (CI2 1500/2000)
500 MBH
1000 MBH
CI2 1500/2000
For CI2 1500
1. Apply sealing tape to the top burner.
2. Mount the burner adapter to the burner and secure in
place with a hose clamp.
3. Secure the flexible combustion air inlet tube to the
burner adaptor with a hose clamp.
4. Mount the burner adapter to the flange at the base
of the burner.
5. Secure in place with supplied hardware. Secure the
flexible combustion air inlet tube to the burner
adaptor with a hose clamp.
Note: for the CI2 2000, repeat steps 4 and 5 for the
upper burner.
1. Remove front wheels and re-install upside down on
frame rail for future use.
2. Remove adaptor collar from the combustion air intake
pan.
3. Slide the combustion air intake pan underneath the
boiler until it protrudes from the rear.
4. Re attached the adaptor collar to the combustion air
intake pan.
7
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Connecting the Burners to the Combustion Air Intake Pan (CI2 1500/2000)
CI2 1500/2000
Combustion Air Inlet Reducer (CI2 1500)
1. Connect the flexible combustion air inlet tube of each
burner to the combustion air inlet pan.
2. Slide the front retaining panel into position..
3. Secure in place with screws.
For CI2 1500 only
Install the combustion air inlet reducer to the combustion
air pan, at the rear of the boiler.
6178 722 - 01
Vitocrossal 200 CI2 Combustion Air Intake Adaptor Kit Installation
Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.
Closing the Boiler
CI2 1500/2000
1. Place the bottom of the front panel on the front sill.
2. Push in the top of the front panel until you hear a click.
3. Lower the top front panel into position.
4. Flip down the top panel handle.
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Viessmann 7946564 Combustion Air Intake Adaptor Kit enables the use of an external combustion air source for Viessmann Vitocrossal 200 CI2 boilers, enhancing safety and efficiency. It prevents combustion air from being drawn from the room where the boiler is installed, ensuring a reliable air supply for optimal boiler operation.
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