GENERAL: The evaporative cooler shall be a self contained, single housing unit consisting of a minimum of a "wet section" and "fan section". The "wet section" shall consist of cooling media, water delivery system and any selected accessories. The "fan section" shall consist of a fan (blower), motor, drive arrangement and any selected accessories to deliver specified air volume against specified static pressure. The wet section and fan section shall be constructed from Stainless Steel grade 304 unless otherwise specified. A galvanized "C" channel type undercarriage frame with lifting lugs shall be included.
1.0 HOUSING:
1.1 The "fan section" shall be constructed from Stainless Steel, grade 304 natural 2B bright finish or as otherwise specified. The entire housing shall be constructed in one piece and supported on a "C" channel type undercarriage frame, with lifting lugs, around the entire perimeter and cross-wise under the wet section and fan section. The housing shall be airtight and waterproof.
1.2 A lift-off or hinged access panel shall be provided in the fan housing with an opening of 20" wide X 60" high, or height of fan housing if less than 60" high. The access panel shall be gasketed or formed to preclude air or water leakage into the interior of the housing. The opening shall be in line with the blower to allow for service of the motor, belt adjustment, bearings and possible shaft replacement.
1.3 The wet section (evaporative cooling module) shall be constructed from Stainless Steel grade 304 consistent with the fan section. It shall consist of a sump, sides and top. A side lift-off or hinged panel for media access and service of the float valve assembly for make up water shall be provided. Removal and replacement of the media can be made through either a side lift off panel, top removal, intake or discharge side of the section as specified. The wet section shall be mechanically attached or welded to the fan section housing and shall be supported across it's entire width by the under-carriage frame.
Internal components of the wet section shall be cooling media, water delivery system, internal plumbing including a header pipe, make-up water, overflow and drain fittings. Refer to section 3.0 for further details.
2.0 FAN SECTION:
2.1 The blower (fan) shall be centrifugal type, double width, double intake, forward curve or backward inclined as specified and shall be capable of delivering air volume at external static pressure as specified. The blower (fan) shall meet AMCA 210 standards and shall be mounted in arrangement 3 configuration. The discharge mode shall be either down, side or up as specified. The blower (fan) shall have a solid, ground and polished steel shaft with a lubricable self-aligning type bearings on each end. The blower (fan) wheel shall be statically and dynamically balanced and tested in accordance with AMCA standard 210.
2.2 Blower (fan) motor shall be ODP (open drip proof) or TEFC (totally enclosed fan cooled) type as specified and sized to drive the blower (fan) at specified capacity without exceeding nameplate rating. Service factor of the motor shall be 115% of nameplate rating. Electrical characteristics of the motor shall comply with available electrical service as specified.
2.3 Motor mount shall be adjustable to allow for drive belt tension and alignment.
2.4 Blower (fan) sheave shall be non-adjustable v-groove type selected to provide necessary blower (fan) RPM.
2.5 Motor sheave shall be adjustable v-groove type selected to provide necessary blower (fan) RPM.
2.6 Vibration isolation shall be provided under the blower (fan) and motor and shall be the spring type. Isolators shall be selected for minimum deflection. Flexible neoprene shall be attached between the blower (fan) discharge and the cabinet.
3.0 EVAPORATIVE COOLING MODULE (Wet Section):
3.1 The wet section shall be constructed from Stainless Steel, grade 304. The outer housing shall consist of a sump, sides and top. An externally mounted access panel shall be provided for access to and adjustment of the float valve assembly. The housing shall also provide a method of cooling media access and removal. Standard removal method is through a side lift off panel however removal can be accomplished through removeable rails on the intake and discharge side of media when so specified. All metal in the wet section shall be Stainless Steel, grade 304 or similar non-corrosive metal.
3.1a Sump construction shall include TIG (fusion) welded corners and joints. The sump shall be leakproof without the use of fillers, sealants or coatings. A media support channel with punched holes on a staggered pattern shall be included. This channel shall extend across the full width of the media. The channel shall provide a minimum of 50% open area for water to flow freely from the media into the sump.
3.1b An air bypass inhibitor plate shall be provided from the intake bottom of the media, extending into the water to preclude any untreated air flow under the media.
3.1c Stainless Steel couplers with female pipe thread shall be welded into the sump and side to provide for make-up water, overflow and drain. Size shall be as specified.
3.2 Water distribution system shall be Cycle-Flow(r) (note 1) as patented and manufactured by Premier Industries, Inc., or equal. Alternative fresh water distribution systems shall be allowed only if pre-approved based on test data submitted to the specifying Engineers. Alternative pump type re-circulating systems with float valve assembly shall be acceptable.
3.2a Internal plumbing shall be PVC schedule 40 sized to meet flow rate demand. A balancing valve shall be provided in the riser pipe between the source and header to regulate water flow over the media. Header pipe shall contain drilled and cleaned orifice holes sized to assure proper water flow over the media. Water from the header pipe shall be discharged upwards against a stainless steel deflector to redirect the water from the header pipe back onto the media, evenly across its' full width. A PVC union shall be provided in the riser pipe below the header pipe to facilitate removal of the header pipe.
3.3 Cooling media shall be CELdek(r) or Glacier-Cor(tm) rigid media, 12" thick or as specified. This media is a cross- fluted pad of cellulose material impregnated with anti-rot salts and rigidifying saturants and wetting agents with at least 123 square feet of evaporative surface area per cubic foot of media. The transverse flutes shall be 450 and 150 with water flow in the direction of the 450 flute and air flow in the direction of the 150 flute. Media shall have no more than .25" w.g. air pressure drop at 500 feet per minute face velocity and shall develop a saturation efficiency of not less than 89% for 12" thick media.
3.3a Media access and removal shall be accomplished through a removable side or top panel provided for this purpose.
4.0 ELECTRICAL CONTROLS:
4.1 Electrical controls shall consist of a minimum of a fused disconnect located at the unit and a magnetic across the line starter and seperate contactor to control water distribution. The electrical controls housing shall be NEMA 3 for indoor units and NEMA 3R for outdoors installation.
End of Standard Specifications:
Note 1: Cycle-Flow(r) is a patented water distribution system available from Premier Industries, Inc., and is a 100% fresh water system. The water flow over the media is controlled by automatically timed "on" and "off" cycles. The timing of the "on" and "off" cycles are determined by the prevailing climate conditions (dry bulb and wet bulb) using actual evaporation rate as the criterion for actuation of the cycles. The pump and float valve assembly are not used when the Cycle-Flow(r) system is used. Fresh water distribution systems meeting the above operational criteria without violation of patent rights will be acceptable after approval based on certified test data.
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Note 2: Contact manufacturing plant for further detail or assistance at 800-254-8989 or e-mail piec@aol.com or fax 602-997-5998.