PART 1- GENERAL
1.01 Summary
This section describes the active chilled beams.
1.02
Submittals
Submit product data for all items complete with the following information:
1) Operating weights and dimensions of all unit assemblies.
2) Performance data, including sensible cooling capacities, nozzle types, primary
and total supply (primary plus induced) airflow rates, chilled (and where
applicable hot) water flow rates, noise levels in octave bands, air and water side
pressure losses and supply air throw values.
3) Construction details including manufacturers recommendations for installation,
mounting and connection.
PART 2- PRODUCTS
2.01 General
Materials and products required for the work of this section shall not contain asbestos,
polychlorinated biphenyls (PCB) or other hazardous materials identified by the engineer
or owner.
Approved Manufacturers:
These specifications set forth the minimum requirements for the active chilled beams to
be accepted for this project. TROX Model DID632A active chilled beams are the basis
of design for this project. The mechanical contractor will provide as base bid the TROX
Model DID632A active chilled beams. Any alternate manufacturers shall be submitted
for approval a minimum of 14 days prior to bid. Alternate manufacturers approved prior
to bid shall be only be offered as an alternate to the base bid. The mechanical contractor
shall be responsible for any and all additional design or coordination charges associated
with changes in quantity or length associated with alternate manufacturers. Products
provided by the following manufacturers will be deemed acceptable provided they meet
all of the construction and performance requirements of this specification:
1. TROX
2.02
Design
1) Furnish and install TROX DID632A series active chilled beams of sizes,
capacities, discharge patterns and nozzle types as indicated on the drawings
and within the mechanical equipment schedules. The beams shall be
constructed and delivered to the job site as single units. Unit lengths and
quantities shall match the scheduled equipment. NO EXCEPTIONS.
2) The beams shall consist of a minimum of 20 gauge steel housing encasing the
integral sensible cooling coil and a plenum feeding a series of induction
nozzles. Plenum casing shall be unfinished galvanized steel.
3) The face of the beam shall consist of a room air induction section of 50% free
area perforated galvanneal steel mounted in a hinge down section with 2
locking pins, flanked by two linear supply slots bordered by steel borders. Two
piece induction faces shall not be acceptable. OPTION (cost add): Induction
face consisting of linear bars mounted parallel to the length of the beam. The
facial appearance of one and two way beams shall be identical.
4) The entire visible face section shall be finished in standard white powder coat
paint or finished as specified by the architect (cost add).
5) Beams must be available with a minimum of six (3) separate formed metal
nozzle configurations which allow the designer to maximize the heat transfer
and primary airflow capacities of the units. Plastic or adjustable nozzles are
not acceptable. Should adjustable nozzles be used they must be factory set and
locked to project specific guidelines prior to shipment.
6) Should the velocity of the air through the induced air face and coil exceed 125
FPM the beam shall be provided with an integral manufacturer supplied lint
screen.
7) Beam shall include a condensate tray beneath the coil.
8) Beams shall be provided with side and end details which will allow its flush
integration into a standard (nominal 24 inch wide module) 15/16” wide
suspension grid. OPTION: border to integrate (flush with grid or with 3/8”
drop tegular acoustical ceiling tile) into 9/16” or 15/16” wide suspension
grid.
9) OPTION (cost add): Beams intended for exposed mounting (no acoustical
ceiling system) shall be fitted with horizontal (Coanda) plates which extend at
least six (6) inches from the outside of its discharge slots to assure that a
proper discharge air pattern is maintained.
10) The overall beam height shall not exceed eleven (11) inches.
11) Each beam shall be provided with a pressure tap that may be used to measure
the pressure differential between the primary air plenum and the room. An
airflow calibration chart or data which relates this pressure differential reading
with the primary and beam supply airflow rates shall also be provided by the
beam manufacturer and affixed to each beam.
12) Beams shall be provided with connections that accommodate either 2 or 4 pipe
coil operation. Four pipe configurations shall require separate supply and
return connections for chilled and hot water. The coils shall be mounted at an
angle of at least 45° to allow any condensation that may be formed to flow into
a factory mounted condensation tray. The coil shall be manufactured with
seamless copper tubing (⅝” outside diameter) with minimum .016 inch wall
thickness mechanically fixed to aluminum fins. The aluminum fins shall be
limited to no more than eight (8) fins per inch. The beam shall have a
maximum working pressure of 200 PSI, be factory tested for leakage at a
minimum pressure of 500 PSI. Each chilled beam shall be provided with
factory integrated drain fittings on each water circuit.
13) Coil connections shall be ½” NPT male threaded fittings for connect to the
water supply circuit. Connections shall face upwards and shall be at least 1½”
long to facilitate field connection (by others). Turned or straight connections
are not acceptable as connection would interfere with ceiling grid and other
above ceiling services. Beam shall be constructed so that the coil connection
location can be field modified without cutting or modifying or otherwise
disturbing the structural integrity of the active chilled beam housing.
14) Beams shall be delivered clean, flushed and capped to prevent ingress of dirt.
Beams shall be individually boxed and all air and water connections shall be
covered with a protective seal, which will prevent dust and other contaminants
from entering the beam. The face shall remain protected by a factory applied
adhesive film until the beams have been maneuvered into their final resting
position.
2.03 Accessories
1) OPTION (cost add): The chilled beam supply air plenum shall be provided
with external 1/8” closed cell foam insulation.
2) OPTION (cost add): Each beam shall be furnished with a volume flow limiter
for mounting in the ductwork, prior to the inlet of the chilled beam. This device
shall allow field adjustment of primary air flow rates and be rated for inlet
static pressures up to 1.2 inches H2O of inlet static pressure. Volume flow
limiter shall add no more than 0.15 inches H2O pressure drop to the primary
air delivery system and shall not require any control or power connections.
3) OPTION (cost add) Each beam shall also be provided with factory integrated
air vents on each water circuit.
4) OPTION (cost add) Manufacturer provided hoses shall be eighteen (18)
inches in length and suitable for operation. Such hoses shall be 100% tested
and certified for no leakage at 400 PSI (1600 PSI burst) on ½” hoses.
Connector hoses shall consist of an EPDM lined hose with a wire braided
jacket. The hoses shall be suitable for operation in an environment between 40 and 200˚F.
2.04 Performance
1) Manufacturer shall prove evidence of at least fifty (50) chilled beam projects
in the United States and have been in the business of manufacturing active and
passive chilled beam in the United States for a minimum of five (5) years.
2) Coils shall be rated in accordance with AHRI Standard 410, but their cooling
and heating capacities shall be established in accordance to DIN Standard
4715 for the specific application on the inlet side of the submitted chilled
beam.
3) Chilled water flow rates to the beams shall be limited to that which results in a
ten (10) foot head loss. Water flow velocities through the beam shall not
exceed 4 FPS.
PART 3- EXECUTION
3.01 Installation
1) Coordinate the size, tagging and capacity of the beams to their proper location.
Upon request the manufacturer, in coordination with the mechanical
contractor, shall palletize and ship chilled beams by floor and/or area.
2) Chilled beams up to (and including) six feet in length shall be independently
suspended (by others) from the structure at four (4) points either by threaded
rods of ⅜” diameter or another approved suspension method. For beams
beyond six feet in length, six (6) points of support shall be provided. The
support members shall be fixed to factory furnished mounting brackets on the
beam. The beam shall then be positioned into the acoustical ceiling grid and
leveled horizontally.
3) Before connecting the supply water system(s) to the beams, contractor shall
flush the piping system(s) to assure that all debris and other matter have been
removed. The beam is supplied pre-flushed and clean.
4) Contractor shall perform connection of beams to the chilled water circuit by
method specified (hard connection using sweated connection or connection
using flexible hoses).
5) No power or direct control connections shall be required for the operation of
the chilled beam.
3.02 Cleaning and Protection
1) Protect units before, during and after installation. Damaged material due to
improper site protection shall be cause for rejection.
2) Clean equipment, repair damaged finishes as required to restore beams to asnew appearance.