1、Comments, suggestions, or questions on this document should be addressed to WR-ALC/LGEC, 480 Richard Way Blvd. Suite 200, Robins AFB, GA 31098-1640 or emailed to bob.yoherobins.af.mil . Since contact information can change, you may want to verify the currency of this address information using the AS
2、SIST Online database at www.dodssp.daps.mil. AMSC N/A FSC 4120 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. A-A-59506 02 July 2004 COMMERCIAL ITEM DESCRIPTION AIR CONDITIONING UNIT, DIESEL ENGINE DRIVEN, TRAILER MOUNTED The General Services Administration has aut
3、horized the use of this commercial item description by all federal agencies. 1. SCOPE. This commercial item description (CID) covers a wheel-mounted, diesel-engine-driven, single-pass air conditioning unit of not less than 110 tons nominal cooling capacity (DAC110). 2. PRECEDENCE. 2.1 Precedence. Th
4、e DAC110 shall comply with the requirements of this document and shall comply with the applicable requirements of ASHRAE Standard 52.2; Federal Acquisition Regulations; FED-STD 595; NFPA 70 (Class 1, Division II, Group D hazardous area); OSHA; SAE AIR 1375, SAE ARP1247, SAE ARP1801, SAE ARP5374, SAE
5、 AS8090, (Type II, Group C), SAE AS38386, SAE J447 and SAE J551 in effect at the time of manufacture, unless otherwise stated. Unless otherwise stated, this document has precedence over a referenced document. Where referenced documents may conflict in characteristic or performance, the more stringen
6、t requirement shall establish the minimum. 3. SALIENT CHARACTERISTICS. 3.1 Description. The DAC110 shall selectively operate as an air conditioning unit, a ventilation unit, or a heating unit. The DAC110 shall consist of a diesel engine primary power source, a vapor cycle air conditioning system, an
7、 air delivery and distribution system, and the necessary controls, wiring, piping, instrumentation, and housing with wheel-mounted fully suspended undercarriage, as specified herein. The DAC110 shall deliver not less than 600 pounds per minute (ppm) of conditioned air to military aircraft through th
8、ree 12-inch diameter flexible supply air ducts. The DAC110 shall be designed; to operate in any mode for not less than eight continuous hours, to not require less than 200 hours between service maintenance, to operate not less than 2000 hours per year, and for a service life of 20 years. Major compo
9、nent rebuilds shall not be required more frequently than every 10,000 hours operation. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59506 23.1.1 Performance. The DAC110 shall be capable of storage, and start and operation under the
10、following environmental conditions: a. Storage temperature range from -60F to +165F. b. Operating temperatures range from 0F to +125F. c. Exposure to relative humidity up to 100 percent. d. Exposure to salt fog consistent with a seaside environment. e. Exposure to blowing sand and dust particles as
11、encountered in desert areas. 3.1.1.1 Cooling. The DAC110 shall deliver not less than 1,320,000 British Thermal Units (BTU)s of cooling, as measured by air enthalpy method of SAE ARP5374, at entering ambient air conditions of 97F dry-bulb and 85F wet-bulb. Cooling mode shall operate between ambient c
12、onditions of +40F and +125F. Leaving air conditions in cooling mode shall be manually resettable down to +50F. System controls shall maintain discharge temperature setting automatically, up to total system cooling capacity. Exceeding system capacity shall only cause a loss of set-point control. 3.1.
13、1.2 Heating. The DAC110 shall deliver not less than 750,000 BTUs of reverse cycle cooling at entering ambient conditions of 47F. Cooling mode shall operate between ambient conditions of +20F and +70F. Leaving air temperature shall be manually resettable up to 100F. System controls shall maintain dis
14、charge temperature setting automatically, up to total system heating capacity. Exceeding system capacity shall only cause a loss of set-point control. 3.1.1.3 Booster coil heating. The DAC110 shall utilize rejected heat from the diesel engine to add heat to the air stream. Booster coil activation sh
15、all be interlocked to operate only with ventilation or heating mode settings. Leaving air conditions shall be manually adjustable up to 100F. System controls shall maintain discharge temperature setting automatically, up to the total allowable heat rejection capacity of the engine. Booster coil heat
16、ing shall be the first stage of heating. 3.2 Standard commercial product. The DAC110 shall, as a minimum, be in accordance with the requirements of this CID and shall be the manufacturers standard commercial product. Additional or better features, not specifically prohibited by this CID, but which a
17、re a part of the manufacturers standard commercial product, shall be included in the air conditioner furnished. 3.3 Interchangeability. All delivered DAC110 units shall be identical to the extent necessary to ensure interchangeability of component parts. Provided by IHSNot for ResaleNo reproduction
18、or networking permitted without license from IHS-,-,-A-A-59506 33.4 Engine. The DAC110 shall be driven by a liquid cooled diesel engine of a size providing not less than 120% of the worse case total load requirement (not necessarily the design load point requirement) while operating on JP-8 fuel at
19、3000 foot altitude. Instruments and gauges specified in 3.4.1 shall be of a type recommended by the engine manufacturer. The air intake shall include a paper element filter, and shall include an air restriction gauge to indicate service replacement point. The exhaust routing shall not provide a dire
20、ct gravity path for water back to the engine. The exhaust outlet shall be protected from intrusion of water. The engine shall be equipped with a system capable of starting the engine at any temperature above zero (0)F within 5 minutes, without any supplemental external power requirement. Starting ai
21、ds such as glow plugs or ether priming may be used. Ether priming must be of the measured shot type. The engine shall be ready for full load operation within 15 minutes of starting. Restoration of engine starting energy shall not require more than 30 minutes of engine operation. The connection betwe
22、en the engine and the driven components of the vapor cycle and air distribution systems shall be releasable, without disassembly of mechanical connections. Safety controls shall shut down the engine on loss of oil pressure, coolant overheating, or for other causes published by the manufacturer. 3.4.
23、1 Engine instruments and controls. Engine instruments and controls shall be grouped together on the DAC control panel. As a minimum, the following engine instruments and controls shall be furnished: a. Control, engine starter b. Control, engine speed (see 3.4.1.1) c. Control, engine shutdown d. Cont
24、rol, engine emergency shutdown (see 3.4.1.2) e. Control, engine-starting aid (if required) f. Gauge, tachometer g. Gauge, oil pressure h. Gauge, coolant temperature i. Gauge, battery condition indicator j. Gauge, fuel, with warning light for less than 1/4 tank full k. Hour meter, registering not les
25、s than 9,999.9 engine hours total. 3.4.1.1 Control engine speed. An operator controlled throttle shall be provided for regulation of engine speed. The throttle shall include a lockable fine adjustment feature, limited by the governed speed of the engine or the maximum rpm limit of a driven component
26、, and shall include a quick return to idle feature. 3.4.1.2 Emergency engine shutdown switch. An emergency engine emergency shutoff switch shall provide for an immediate and complete shutdown of the engine at any operating condition without the use of any other control. The switch shall be marked by
27、 a red circle at least one inch in diameter. A reference to possible system(s) damage resulting from this action shall appear in the operators manual. 3.5 Reversible vapor-cycle system. The DAC110 vapor-cycle system shall operate on a single-phase refrigerant that is neither a Class I or Class II Oz
28、one Depleting Substance/Compound (ODS/ODC). The DAC110 reversible vapor-cycle system shall include compressor(s), condenser and evaporator coil(s), ambient air fan(s), expansion valve(s) and operational controls. The compressor manufacturer Provided by IHSNot for ResaleNo reproduction or networking
29、permitted without license from IHS-,-,-A-A-59506 4shall coordinate on the system configuration and the engagement method. The compressor shall not be a piston type design. Motor driven components shall be vibration isolated from the housing and connected systems. Controls shall maintain discharge ai
30、r quality below saturation and shall maintain temperature within 3 F from the set point, while operating within total system design capacity. Coil defrost shall be automatically controlled. Controls shall isolate at least 95% of the system refrigerant during normal shut-down sequence. Should the vap
31、or-cycle system be shut-down by a safety device or emergency action, upon re-establishment of power, the controls shall start and complete a normal shut-down sequence prior to re-starting vapor-cycle operation in accordance with controls settings. Safety features shall shut down the system, if any s
32、et-point limit for temperatures, fluid levels, flows, or pressures are exceeded. 3.6 Air delivery and distribution system. The air delivery system design point shall be 600 ppm at an external static pressure of not less than 40 inches water column. Total air delivery volume shall be adjustable betwe
33、en 300 and 700 ppm. Air shall be routed through three 12 inch discharge outlets with individual duct volume controls. Discharge outlets shall include mating connections for attachment of 12 inch female air duct hose connectors in accordance with SAE AS38386/2. Discharge outlets shall have female sty
34、le lock-on metal caps, retained to the housing with chains or cables. Volume controls shall include a lockable fine adjustment feature. Total flow and individual duct flow shall be adjustable and monitored from the control panel. The air intake shall incorporate a serviceable filter media certified
35、to meet ASHRAE Standard 52.2, with a Minimum Efficiency Reporting Value of 13, or a dust spot efficiency of 80 percent. The filter shall be serviceable through either an access door or through the intake air grille. A gauge on the control panel (see 3.10.1) shall show filter restriction and shall id
36、entify the service requirement point. 3.6.1 Air delivery ducts and adapters. The DAC110 shall be equipped with six (6) twelve inch diameter by 25 foot insulated flexible duct assemblies in accordance with SAE AS38386. Each duct assembly shall include one 12-inch diameter male and one 12 inch diamete
37、r female connection in accordance with SAE AS 38386. The DAC110 shall be equipped with three reducing duct adapters, having one 12-inch diameter female end connector in accordance SAE AS38386/2 and one 8-inch diameter male end in accordance with MS33562. 3.7 Booster coil system. The booster coil sys
38、tem shall consist of a coil located in the air delivery system supplied by rejected heat from the diesel engine. When manually activated, a portion of the engine coolant shall bypass the engine radiator and flow through the air delivery system coil. The engine coolant pump shall provide circulation
39、flow through the air deliver system coil. Coolant flow to the air delivery coil shall be limited by the engine manufacturers defied acceptable return water temperature. Coolant volume shall be regulated by the discharge temperature setting on the control panel. Provided by IHSNot for ResaleNo reprod
40、uction or networking permitted without license from IHS-,-,-A-A-59506 53.8 Storage battery(s). DAC110 electrical power shall be provided by commercially available 12-volt absorbed glass matt storage battery(s). Recharging of the battery(s) shall be provided by the diesel engine. All DAC110 system el
41、ectrical requirements, not including mobility lighting, shall be provided by the storage battery(s). 3.9 Housing. A housing shall enclose the engine, the vapor cycle system, and the air delivery and distribution system. The housing shall provide a weather-resistant enclosure for all components. Hing
42、ed doors shall provide protection for the air intake(s), air discharge(s), ambient air coil(s), ambient air fan(s), engine radiator, and the control panel. Hinged doors or hinged access panels shall be provide for operational inspection and servicing. All major components shall be replaceable throug
43、h either the service access doors or through removable panels specifically provided for the purpose. All air openings shall be protected from bird and plant matter infiltration by a rigid mesh. Condenser coil intake air shall be protected from dust and dirt particle build-up. Conditioned air intake(
44、s) shall not pull design conditions rainfall into the air delivery system. Conditioned air discharge connections shall have removable caps, secured by a cable or chain. 3.9.1 Duct storage compartment. The housing shall include weather-resistant compartment(s) for the storage of six 12 inch diameter
45、duct assemblies and three duct adapters (see 3.6.1). All ducts and adapters shall be accessible while standing on the ground without the use of a reach-extending device. 3.10 Piping and instrumentation. All systems piping materials and controls components shall be selected for the applications and p
46、ressures consistent with applicable law, published commercial guidelines, and safety factors. All piping shall be secured to structure to prevent chaffing and vibration during any mode of operation or mobility. Switches, controls, and gauges specified in 3.10.1 shall be of a type recommended by the
47、manufacturer for the application. 3.10.1 Operators control panel. An operators control panel shall be located on the side of the DAC110. The control panel shall be fully illuminated for night servicing operations. All components on the panel shall be weather proof. The panel shall contain as a minim
48、um the following components: a. Switch, mode selector (cooling-ventilation-heating) b. Gauge, ambient air filter restriction (see 3.6) c. Gauge, discharge air temperature d. Gauge, discharge air pressure e. Gauges, total airflow rate and (3) individual discharge outlet air flow rates f. Controller,
49、total discharge airflow g. Controller, (3) individual discharge duct air-flow h. Controller, cooling mode discharge temperature i. Controller, heating mode discharge temperature j. Engine controls (see 3.4.1) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59506 63.11 Undercarriage. The DAC110 undercarriage shall be separately mounted to or integral wi
