ACB Ceiling mounted cassette models

operation &
acb ceiling-mounted
cassette models
built on innovation
Active chilled beams
Active Chilled Beam cassette style beams are induction driven, heating and cooling
terminal units that are designed for highly efficient energy transfer. Common ceiling
applications include integration into T-bar ceiling grids, plaster ceilings, and exposed
ceilings (some accessories may be required for installation into specific ceiling types ).
The installer is to provide the following:
•Required secondary water piping and valves including
isolation valves, balancing valves, flow control zone
valves and other valves/controls as specified.
•Primary air volume control balancing damper.
•All mounting hardware (threaded rods, cables, nuts,
etc.) and primary air flexible ducting.
•For dry wall or plaster ceilings an additional trim frame
kit is required.
•Any other items necessary to complete the installation
NOTE: Dadanco provides several accessories to complement your installation. Please reference
the Accessories brochure or contact Dadanco for available accessories.
When possible please use a cart and a hoist to transport and raise the beams. Remember to
wear proper personal protection equipment.
unit construction
Each ceiling-mounted cassette active chilled beam unit consists of:
•Primary air plenum with induction nozzles (ACB20/40/45: 2-row | ACB50/55: 1-row)
•Round or Oval primary air inlet connection 1 (See Handings Configuration Key for available
•Secondary water coil tr
•Supply air discharge slot 2 (ACB20/40/45: 2 Active Slots | ACB50/55: 1 Active & 1 Dummy
•Mounting brackets 3 (length dependent)
•Mixing chamber
•2 or 4-pipe secondary water coil connection 4 (Connection can be configured as supply
or return based on on-site pipework)
•Perforated supply and return air grille assembly 5
•An identification label and commissioning chart
•The ACB20 has a drip tray lying below both vertical coils with a sweat drain connection
NOTE: The location of the air and coil connections on each beam is determined by on-site
personnel using the Handings Configuration Key on pages 8-10 and returning a filled out Unit
Configuration schedule provided in the submittal package.
unit construction
If units are not being installed immediately store in a well protected, dry, temperate location
until they are ready for installation. Each beam comes with a protective plastic covering over
the grille to prevent potential damage. Remove plastic covering only after the installation of the
beam is complete Reference the beam drawing for the weight at each designed length. Please
follow your on-site safety standards when lifting units and utilize caution when inserting the
beams into the ceiling.
In normal operating conditions the minimum required maintenance
involves the secondary water coil, nozzles (and lint screen if provided), and consists of:
•Visual inspection of the secondary water coil, nozzles and lint
screen (if provided). Vacuum as required.
•To remove dust wipe the unit grille with a dry cloth.
• Check the unit labeling to ensure that the proper unit
is being installed at each location which
can be found on the side of the plenum
• Determine the orientation of the air and
water connections in relation to the site
• Check to ensure adequate clearance for the
piping and duct connections.
• Check that the available ceiling space for
the installation of the unit is free of other
services and structural members.
• Determine the position of the unit in the
ceiling grid.
Note: Beams that are 2’, 4’, and 6’ long are
designed to have (4) mounting brackets (2 on each side). Beams that are 8’ and 10’ long have (6)
mounting brackets (3 on each side). Ensure that each mounting bracket is utilized when securing the
beam to the wire hanging kits.
wire hanging kit
• Attach a trapeze fastener to each mounting bracket on the ACB unit
with the plastic clips provided in each kit.
• Secure each end fixing (stud or hanging loop) to the building structure.
• Pass each cable through the trapeze fasteners, and adjust the height
to at least 2-3” above the grid position.
• Once the ceiling grid is installed, the chilled beam can be lowered into
position by adjusting the cable lengths.
NOTE: Various wire hanging kits are available in the market with different
fasteners and end fixings. The above instructions apply to the hanging
kits available from Dadanco. If other kits are used, please refer to the
manufacturer’s installation instructions.
Threaded rod method
• Determine the position of the first under-slab ‘Unistrut’ 2 foot channel bracket in the slab above
or a ceiling
structural member. The first ‘Unistrut’ channel bracket should be positioned approximately the
distance from the mounting brackets to the end of the unit and centered in relation to the width
of the unit and its opening in the ceiling grid. Drill and secure the ‘Unistrut’ channel bracket to
the slab above or ceiling member with 3/8” bolts.
• Install the second ‘Unistrut’ channel bracket length at a position parallel to and at the correct
distance from the first channel bracket along the length of the unit, according to the distance
between brackets of the unit. Drill and secure the ‘Unistrut’ channel bracket to the slab above or
ceiling member with 3/8” bolts.
Threaded rod method Cont...
•Determine required length of 3/8” threaded rod between the ‘Unistrut’ channel brackets and unit
mounting brackets. Rod length should be approximately the distance from the suspended T-Bar
ceiling tile frame lip to the underside of the slab above, or ceiling members, less the height of
the brackets from the bottom of the unit. This provides sufficient rod length to permit the unit
to be raised and lowered without removing the hanging rods.
•Install (1) 3/8” flat washer, hex nut and ‘Unistrut’ fixture nut to the top end of each 3/8” threaded
•Install (1) 3/8” hex nut and flat washer to the other end of the threaded rod.
•Raise the unit into position above the ceiling grid frame, aligned to the ceiling grid opening. Install 3/8” flat washer and hex nut to the treaded rod at the underside of the unit mounting bracket to hold the rod loosely on the bracket.
NOTE: Do not fully tighten nuts at this time.
•Raise the position of the unit by tightening the lower hex nuts until the bottom lip of the unit is
approximately 2-3” clear of the top of the suspended ceiling grid T-Bar frame.
•Once the T-bar grid has been installed, lower the unit into the T-Bar frame by turning the bottom hex nuts. Unit supply/return air grille must fit completely into the T-Bar frame as if it were a
ceiling tile.
•NOTE: Unit can be moved front to back in the slots of the mounting brackets and left to right
along the ‘Unistrut’ channel bracket lengths to achieve proper alignment prior to tightening the
NOTE: The unit must be supported from the ceiling slab/structural member. The unit weight should
not be supported by the T-bar grid.
• Assure the unit is level and properly aligned in theACB45
T-Bar frame before tightening
the mounting
For applications where a reduced visual impact is desired or
available width is restricted, these models feature a horizontal
• Tighten
all 3/8”
nuts once
the unit
is properly
positioned and aligned in the T-Bar grid
coil and a narrow
12” hex
wide profile.
These beams
are available
lengths up to 10 feet in 1-foot increments and can be specified
with a border design suitable for use in 12” wide service zone
style ceilings. The ACB45 is a two-way while the ACB55 is a oneway air discharge pattern.
water connections
Note: All Dadanco chilled beams come with 1/2” OD tube or 1/2’’ NPT connections regardless of the
water flow rates; therefore 1/2” flexible hoses or piping should be used to connect to the beams.
Otherwise, reducers are required.
•Once the beam has been successfully installed in the correct ceiling position, install all isolation,
control and balancing valves according to the design drawings. Install all valves and make all
connections per industry approved plumbing practices and local codes.
•Connect the secondary water coil inlet (s) and outlet (s) to the correct secondary water pipes.
Refer to submittal drawings and/or labeling on the units to determine which coil connections are
supply and return for chilled water and/or hot water.
NOTE: For 4-pipe coils, ensure that the chilled water connections are made to the chilled water
circuit and the hot water connections is made to the hot water circuit. It is recommended that
the unit be connected with readily removable pipe lengths and unions or flexible hoses to permit
disconnection and removal of the unit should this be required.
•In preparing to make the secondary water (SCHW) piping connections to the coil, ensure that the
piping is aligned with the coil connections. If
threaded NPT coil connections are provided,
use the correct tools to grip the flare nut and
union and apply only sufficient force to make
the joint. The use of excessive force could
result in fracturing of the water pipes or their
solder connections. Take care during this
jointing process to ensure that the coil-piping
alignment is maintained.
•Insulate flexible hoses or piping connections
as per project specifications. It is strongly
recommended to insulate chilled water piping
and hoses, especially on the supply-side, to
prevent formation of condensate.
primary air duct connection
•Connect the air with either flexible or rigid duct to the primary air inlet connection and seal
•Primary air inter-connecting flexible duct should be a minimum of 3 feet straight or gradual
radius between the primary air duct and the primary air connection of the unit.
NOTE: Avoid sharp bends in the primary air duct connection. Install all ductwork and make all
connections per industry approved practices and local codes.
•A primary air volume control balancing damper for adjusting the primary air flow during
commissioning must be installed at the take-off from the main primary air duct.
NOTE: Do not install the primary air volume control balancing damper directly to the unit primary
air inlet connection. There should be at least a 3ft distance between the unit and the damper.
•Insulate the primary air inlet up to the primary air duct connection.
•Check that all duct connections are properly sealed to ensure no air leakage.
•Acoustically lined ductwork should be used to make the primary air connection in order to
attenuate noise generated by the balancing damper.
secondary water commissioning
For secondary water flow commissioning, a suitable balancing valve should be installed in order to
measure and adjust the secondary water flow to the designed/specified value.
•If a zone is piped in reverse-return, balancing valves are not required.
•Manual or automatic balancing valves can be used
•Adjust the balancing valve in order to achieve the specified water flow rate(s) per unit, according
to the unit schedule.
•For 2-Pipe changeover systems, balance the water flow to the higher of the two water flow rates
NOTE: Coils are rated at 500PSI
Primary air commissioning
•To accurately commission the primary
air flow to the unit, measure the static
pressure in the primary air plenum
through the commissioning sampling
tube. To achieve this, remove the
sealing plug from the commissioning
sampling tube and connect the
pressure-sensing instrument
(Manometer) to the commissioning
sampling tube. Use the commissioning
chart (pictured) for reference.
NOTE: Do not attempt to measure the static pressure in the flexible duct connection. Measure only
at the provided commissioning sampling tube for commissioning purposes.
•Using the plenum pressure versus primary air flow curve (pictured) supplied for each unit, adjust
the primary air volume balancing damper as necessary to achieve the specified/designed primary
air flow rates.
•Replace the plug to seal the primary air commissioning sampling tube upon completion.
NOTE: Do not attempt to confirm total supply air quantities using a balancing hood measurement
method. The airflow from the unit is a low velocity, low pressure air stream that is often below the
accuracy range of restriction imposing measurement hoods. Resistance imposing balancing hoods
are not recommended for validating total air quantity. Do not attempt to confirm the primary air flow
quantity by conventional Pitot-traverse methods in the primary air ductwork. Low duct velocities and
boundary layer measurement inaccuracies do not permit accurate measurements of duct velocities
for primary air installations.
•If constant volume airflow regulators are used, ensure that each device is set for the design
primary airflow of the corresponding units.
•If the plenum pressure(s) of the corresponding unit(s) are significantly below their design values,
increase the pressure upstream of the regulator.
NOTE: Due to the tolerance of the automatic volume regulators, the plenum pressure(s) of the
corresponding unit(s) can deviate from their design value by as much as 0.25’’ even with proper
installation and sufficient upstream pressure.
handings configuration key
•Air handing is represented by digit 13 in the model number
•Coil handing is represented by digit 17 in the model number
•Non-Standard configurations represented by “Z”
Air Handing: C
Coil Handing: C
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: D
Coil Handing: D
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: E
Coil Handing: E
Spigot Options: 4”,5”,6”, 8”,10” Round
handings configuration key
ACB40, ACB45 & acb20
•Air handing is represented by digit 13 in the model number
•Coil handing is represented by digit 17 in the model number
•Non-Standard configurations represented by “Z”
•Drain connections are on the same side as the coil connections
Air Handing: C
Coil Handing: C
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: D
Coil Handing: D
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: E
Coil Handing: E
Spigot Options: 4”,5”,6”, 8”,10” Round
handings configuration key
acb50 & ACB55
•Air handing is represented by digit 13 in the model number
•Coil handing is represented by digit 17 in the model number
•Non-Standard configurations represented by “Z”
•Red arrow denotes direction of air flow
Air Handing: F
Coil Handing: A
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: F
Coil Handing: B
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: G
Coil Handing: A
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: G
Coil Handing: B
Spigot Options: 4”,5”,6” Round; 8” Elliptical
Air Handing: H
Coil Handing: A
Spigot Options: 4”,5”,6”, 8”,10” Round
Air Handing: H
Coil Handing: B
Spigot Options: 4”,5”,6” , 8”,10” Round
dadanco warranty
Seller warrants to the original Buyer only that the Products manufactured by Seller shall be free from
defects in material or workmanship for a period of twelve (12) months measured from the date of shipment. The foregoing warranty will become void, and Seller will have no obligation whatsoever under
this warranty, with respect to any of the following: (i) Products that are not used or maintained in a
normal and proper manner, in accordance with any manuals and instructions that might be provided
by Seller; (ii) Products that are modified, altered or repaired without the prior written approval of Seller; (iii) Buyer fails to make any payments when due under Section 3 or otherwise in the order or (iv)
Products that are assigned, sold or transferred to an entity other than the Buyer. Seller will repair or
replace at its option Products which upon Seller’s inspection it finds to be defective, based on claims
made in writing to Seller by Buyer within a reasonable time after discovery and within the warranty
period. Products alleged to be defective must be returned to Seller for repair or replacement, freight
prepaid, within thirty (30) days of Buyer’s receipt of the return authorization number, obtained from
Seller, which must be clearly marked on the outside of the return container Replacement components shall be shipped from Seller upon Buyer request and receipt of a valid purchase order number
so the validity of the Warranty can be determined. Unless other-wise specified, replacement Products
shall be Delivered to Buyer “Ex Works Seller’s factory” (Incoterms 2000). Any labor or equipment
rental costs incurred in the dismantling and reassembly of the equipment into which the Products are
installed shall be at Buyer’s sole expense. This warranty excludes Products furnished by the Seller
but manufactured by another party. Such Products shall bear no warranties other than the warranties
extended by and enforceable against the manufacturer thereof at the time of Delivery to Buyer (which
warranties Seller will furnish on Buyer’s written request), for the period stated in that warranty.
Notwithstanding the foregoing, to the extent that a Product or a component within a Product is
deemed by Seller or, in the case of a component, the manufacturer of the component, to be obsolete,
such Product or component shall bear no warranty.
If Buyer removes or permits anyone to remove any safety equipment or warning signs or fails to observe any condition in this Section 14, or if any injury or damage is caused, in whole or in Product, by
the end-user’s failure to comply with applicable federal, state or local safety requirements or Seller’s
instructions as provided in Section 11 above, Seller shall have no obligation to Buyer, and Buyer shall
indemnify and hold Seller harmless against any claims, loss or expense for injury or damage arising
from the improper use of the Products or the equipment into which the Products are installed. Seller
specifically disclaims any and all liability arising out of the operating of the equipment other than the
warranty liabilities to the original Buyer.
The Luxton-Reed Center
47 Westfield Industrial Park Road
Westfield, Massachusetts 01085
(413) 564-5657
SA • Ma
SA • Ma
de in U
de in U
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