4.0 INSTRUMENTS AND CONTROL SYSTEMS
(A) Control Logic: All control relay type logic shall be accomplished using low voltage (24 volts) plug in relays. Defrost functions shall
be controlled by a solid state programmable microprocessor.
(B) Control Panel Enclosure: All operating controls, instrumentation, functional switches, and control systems shall be located at a single control panel center mounted at operator eye level. All operating modes and functions shall be clearly indicated by pilot lights and legibly identified by permanently engraved legends. The functional switches and all operational control settings shall be mounted in a recessed area of the enclosure behind a lockable, hinged, transparent cover to protect against accidental mishaps and unauthorized tampering. The recessed control panel section of the enclosed shall be hinged for easy opening by authorized maintenance personnel. Once this panel is swung open and the top section of the control center is removed, all enclosed control circuit devices shall be readily exposed for simple maintenance purposes.
(C) Main Temperature Control: Shall be an all solid state, microprocessor-based, proportional, electronic controller, which utilizes a precision, platinum resistance thermometer (RTD) for sensing. Automatic reset and rate functions shall be incorporated to compensate for error due to load variations. Operating temperatures shall be easily adjustable by up-down keypad type indicator buttons. The value shall be displayed by a digital panel meter, actual temperature shall be displayed on a large, bright digital read out. The system shall be capable of setting and reading temperatures to readable accuracy of (0.1 C) one-tenth of a degree Celsius.
(D) Alarms:
1.Temperature Safety Limit Alarms: In addition to the main temperature control system described above, an over and under temperature alarm system shall also be provided on the control panel. This alarm system shall be completely independent of the main controller and shall activate in the event the room temperature becomes out of tolerance in either direction. The system shall contain separate high and low alarm set-point and the digital indicator shall be read directly in degrees Celsius with .01 increments. The alarm system shall be adjustable over the full range of the room. If an alarm is activated, an audible alarm will sound and a "High Temp" or "Low Temp" indicator will be illuminated. The alarm will sound until acknowledged by the operator by depressing a reset button. If the high alarm is activated, power to the room heaters will automatically be cut off from the conditioned space. The Low Alarm will deactivate the cooling valves.
2. Remote Contacts: Isolated contacts shall be available for connection to building alarm monitor (BAS) equipment to give remote signal in the event of either high or low alarm actuation.
3. Power Failure Alarm: A rechargeable battery operated power failure alarm shall be included that will give both audible and visual signals in the event power is cut off from the environmental room.
4. Inside "Panic" Alarm: Shall be provided which will consist of a red "mushroom head" type push-button located inside the room near the door. When pressed, this button shall sound an alarm outside the environmental room.
(E) Chamber High Temperature Safety:
In addition to the High Temperature Limit Alarm, a separate temperature switch shall be provided as an Over-Temperature-Cutout to protect the Environmental Room from thermal damage. This device shall be adjustable but always set for a maximum value of 55 C. If actuated the circulation fans, lights, and all heaters will be electrically deactivated.
(F) Humidity Controller: When relative humidity control is specified, a completely solid state, proportional, electronic humidity controller will be supplied. Automatic reset and rate functions shall be incorporated to compensate for errors due to load variations. The relative humidity control point shall be set by a keypad with a digital indicator, and both the humidity set point and the actual relative humidity shall be displayed on a bright, digital panel meter, separate from the readout used for temperature. The system shall be capable of setting and reading relative humidity to one-tenth of a percent RH. Sensor shall be a variable capacitance transducer. Accurate to + 1%
(G) Profile Programmer (Optional) When specified, the control system shall include a microprocessor based set point vs. time profile programmer.
(H) Recorder: A synchronous motor driven circular chart recorder shall be provided to continuously indicate control conditions within the room.The Recorder shall be microprocessor based and programmable to achieve the proper parameter ranges and time bases. Honeywell 10" diameter Model DR4300 Honeywell 12" diameter Truline with programmable chart generation
(I) Computer Interface: When specified, digital computer communication interfaces shall be provided to enable user to monitor and record process variables. RS-232 or 485 format is available
5.0 CONDITIONING PLENUMS
(A) Wall Conditioning Plenum: Room air shall be completely conditioned in a wall-mounted plenum. The motor driven blowers shall recirculate the air continuously to ensure temperature uniformity. The motor driven blowers shall recirculate the air continuously to ensure temperature uniformity. Air distribution uniformity shall be within 10% throughout the room working space. Air shall be drawn in at the floor level, conditioned and forced into an air distribution plenum covering the ceiling. The wall plenums all contain heaters, copper tube with aluminum finned evaporator coil, humidification apparatus, as required, and condensate drain pan. Ceiling material shall be easily removable and shall be constructed of high grade, non-corrosive material. Motors shall be serviceable from inside the room.
(B) Ceiling Conditioning Plenum: Room air shall be completely conditioned in a ceiling plenum. The motor driven blowers shall recirculate the room air continuously to ensure temperature uniformity. The ceiling plenum shall contain heaters, copper tube with aluminum evaporator coils and humidification apparatus, as required, and condensate drain pan. The ceiling conditioning plenum is provided with return and supply ducts that force conditioned air into an air distribution plenum covering the entire ceiling of the environmental room.
Ceiling material shall be easily removable and shall be constructed of high grade, non-corrosive material. Motors shall be serviceable from inside the room.
(C) Electric Heater: Shall be non-corrosive, low-watt density, finned elements, which operate in the black region of the optical spectrum.
(D) Humidifier: The addition of water vapor shall be made into the conditioning plenum and not directly into the room area. Water vapor shall be provided with an Electrolytic type humidifier with built in safety protection, and automatic water level control valve, and a safety overflow. Demineralized or distilled water shall not be necessary to ensure reliable maintenance.
The system shall be self-cleaning, with microprocessor control. The low-pressure vapor generator shall be manufactured from corrosion free materials.
Optional Steam Humidifier:
The addition of water vapor shall be made into the conditioning plenum and not directly into the room area. Water vapor shall be provided with a Steam Generating type humidifier with built in safety protection, and automatic water level control valve, and a safety overflow. The system shall be self-cleaning, with microprocessor control. The low-pressure vapor generator shall be manufactured from corrosion free materials. This system requires the customer to supply a Demineralized or RO water supply.
(E) Dehumidification: Moisture removal shall be accomplished by means of a specially designed, direct expansion refrigeration coil located in the conditioning plenum. The coil shall be designed for effective latent heat removal with a minimum removal of sensible heat. The dehumidification system shall be non-freezing and shall therefore produce a low humidity condition limited by dewpoint of 3 C.
(F) Chemical Drier (sub-freezing Dew Point Capability) When ultra low humidity ranges are required necessitating a sub-freezing dewpoint condition, a chemical dehumidifier shall be provided. Chemical dryer shall be a continuous, dry desiccant, fully automatic absorption, capacity of the refrigeration system shall be increased to adequately neutralize the sensible heat load imposed by the chemical dryer over the entire environmental range.
(G) Vapor Barrier: When specified, all seams of humidity controlled rooms, when assembled, shall be sealed against air and moisture entry with a silicone silastic sealing compound. The sealant shall be flexible when cured to allow for thermal expansion and contraction over the entire environmental range.
6.0 FORCED AIR VENTILATION SYSTEM
A forced air exchange ventilation system shall be provided, when required, for various applications consisting of an independent exhaust blower and adjustable intake filter port. The intake filter port shall be easily replaced. The amount of air exchange shall be:
15 CFM 25CFM 50 CFM Other _____________ of indoor ambient air conditioned air.
7.0 CONSTRUCTION
(A) Walk-in rooms shall be prefabricated, all metal clad, sectionals constructed and designed for easy, accurate field assembly with provisions to facilitate disassembly for relocation and to add extra panels to increase size.
(B) Panel Construction: Panels shall be made in 11½", 23", and 46" widths and be interchangeable for fast and easy assembly. They shall consist of interior and exterior metal pans precisely formed with metal dies and checked with gauges for uniformity.
Between the double walls shall be 4" of foamed-in-place urethane insulation, which will provide great strength and rigidity. No wood, plastic, or metal framing shall be used, thus avoiding wall heat transfer loss and thermal gradients. Panel edges must have tongue and groove interfaces to assure a tight joint. A flexible vinyl gasket shall be fitted on the interior and exterior of each panel along each tongue edge to provide sealing at each joint. Panels shall be UL approved.
(C) Panel Locking Devices: All panels shall lock together from the interior by self-contained cam-lock fasteners. A single hex wrench tool shall be the only tool required for erection. Batten strips, pressure clips, or other fastening hardware shall not be an acceptable means of covering joints or required in joining panel sections.
(D) Insulation: Four (4") of foamed-in-place rigid urethane with a thermal conductivity factor "K" of not more than 0.12 BTU/ Hr/ Sq. ft. shall be between the double walls. The rated "U" factor shall be 0.03 ("U" factor determined by dividing "K" value by nominal wall thickness -4"). Insulation shall have an "R" value of not less than 33. Foamed-in-place urethane shall be used to add strength and rigidity to the metal
(E) Walls: Note: The process of foaming provides the most positive adhesion of insulation to metal pans available on the market. The process of applying metal to board urethane under pressure with glue is not satisfactory and can result in eventual delamination of metal from insulation under high temperature and humidity. Foamed-in-place urethane construction results in a lightweight room, when completed, and decreases erection costs and final building weight load. Urethane used in this specification shall UL fire test approved and when specified shall have a low flame spread rating of 25 or less.
Only non-CFC blowing agents shall be used to foam these panels.
7.1 Doors:
(A) The door shall be in-fitting, flush mounted, constructed as described in 7.0 above. Door swing shall be right hand, left hand, as required for installation convenience. The door openings will be
36" x 78" 48" x 84" Special :_______________________________
(B) Gasket: The door gasket shall be thermo-plastic with magnetic steel core. Gasket shall be on both sides and the top of door. An adjustable rubber wiper gasket shall be on the bottom of the door. The magnetic force of the gasket shall form a positive
air-tight seal.
(C) Hardware: The door hardware shall be heavy-duty with high luster finish. The hinges shall be of the self-closing type with durable stainless steel pins and self-closing nylon cams. The door handle and latch assembly shall be of the automatic closing type. A safety release mechanism shall be provided on the inside of the room preventing personnel from being lock from the outside. Keyed lock cylinders and padlock latches shall be incorporated with the door latch and handle assembly.
(D) Heated Gasket: A heater shall be built into the perimeter of the jamb to prevent the door from accumulating ice and freezing temperature. (Rooms operating below 0 C.)
(E) Window: A multi-layer, heated thermal pane window shall be mounted in the door with a minimum viewing area of: 12" x 12" 14" x 14" 14" x 23" Special________________
7.2 Floors
(A) Standard: The floor shall have the same construction as described in 7.0. In addition, it shall be rated for 600lbs/ft2 distributed load weight. The interior floor surface shall be heavy gauge galvanized steel. When Specified a Non-Skid Coating is applied to cover the floor area
(B) Building Floor: The modular room wall panels shall be provided with sealing strips to interface with an insulated building slab or a flat floor area. The system shall allow for properly sealing between the existing insulated floor and room walls preventing air infiltration and environmental losses.
(C) Floor Coverings:
Interior floor shall be totally covered with removable, open tread design, 1/8" thick, PVC rubber matting. Open diamond design permits easy cleaning with floor mat in place
7.3 ROOM SURFACE FINISH:
(A) Standard: Interior and exterior walls unless otherwise specified shall be manufactured with .040" thick embossed aluminum surfaces with natural finish. Interior floor surface shall be natural 14 gauge, galvanized steel.
(B) Special Finishes: All interior walls and ceilings shall be .040" aluminum faced with a hard, durable factory applied painted finish. The color shall be white or gray with a painted finish of either epoxy or acrylic enamel.
All exterior walls (exposed surfaces only) shall be .040" aluminum faced with a hard, durable factory applied painted finish. The color shall be white or gray with a painted finish of either epoxy or acrylic enamel.
Closure Panels of matching material will be provided to fill in between customer's building and Environmental Room.
8.0 LIGHTING
(A) Lighting systems shall utilize cool white fluorescent lamps. Lamps and ballasts shall be enclosed in low vapor proof fixtures. The fixtures shall be UL approved. Light fixtures shall be flush mounted and provided in sufficient quantity for minimum intensities of 70 foot-candles measured 40" above the floor.
(B) Low temperature electronic ballasts shall be provided for cold rooms operating below 10 C. Lights shall be installed to provide uniform distribution of light.
(C) Incandescent, vapor proof lights shall be provide for freezers operating below 0 C
(D) Light Cycle Timer: An optional 24 hour on/ off cycle timer shall be provided on the control panel for cycling interior lighting.
9.0 REFRIGERATION SYSTEMS
(A) The refrigeration system shall be specifically designed, engineered, manufactured and of adequate capacities to achieve and maintain the individual room temperature requirements and performance and shall be balanced in operation with the conditioning system. The system shall be factory assembled and tested by Aegis. It shall also include high/ low-pressure controls, receiver, sight glass, moisture indicator, replaceable dryer, thermal expansion valve, and all necessary equipment to achieve the performance specified.
(B) Compressor: The system compressor shall be a semi-hermetic, heavy-duty, industrial unit with solid state motor protection and oil pressure safety control. The compressor shall contain, in addition, an oil sight glass, a lubrication protection cut-out and integral suction and discharge service valves.
(C) Condensing Unit: The system shall be furnished with an air cooled condenser. Fans shall be slow speed, low noise with
metal guard protection.
(D) Water-cooled Condenser: When specified, a water-cooled condenser shall be utilized in lieu of the air cold system. The unit shall be designed to operate on city water of approximately 75 F inlet temperature and is to include a water saving pressure regulation valve. The unit shall be designed for tower cooled building water operating with inlet temperatures of between 60 F and 85 F approximately and temperature rise of 10 F or less. A three way regulator shall be employed for constant compressor head pressure regulation.
Control: The refrigeration system shall contain full capacity control to operate continuously regardless of control system demand. System shall incorporate a bypass to maintain specified temperature ranges. Cooling shall be proportionately controlled by means of the electronic temperature controller modulating liquid refrigerant feed to the conditioning coil.
(E) Redundant Refrigeration System: When specified a backup 100% redundant refrigeration shall be used. The two systems will periodically flip flop on an adjustable cycle timer to assure that both systems are exercised and tested to be functional. On a failure, the passive system will automatically come on line to maintain Room temperature. A failure mode alarm will also be activated and the backup system will now run continuously until the fault is cleared.
Defrost System: When room temperatures operate continuously below 4 C, an automatic hot gas defrost system shall be provided. Defrost cycles shall be controlled by a 24 hour timer adjustable to determine the number of defrosts per day, and the duration of each defrost. On freezer rooms operating at -20 C or below an electric defrost system shall be used in lieu of the hot gas system.
Outside Condensing Unit: When limited space or other requirements dictate, the condensing unit shall be remotely located outside the building. The unit shall be weather protected with an easy access hinged enclosure, properly vented for adequate air movement. The system shall also contain head pressure control and crankcase heaters for proper winterized operation. A NEMA 4 electrical enclosure with disconnect and internal contactor box shall be located on the housing
10.0 SHELVING
Freestanding wire rod shelving units shall be supplied in the amount specified. Shelving material shall be chrome plated or stainless steel and shall be manufactured to high quality standards to be free of burrs, sharp edges, and protrusions. Each shelf shall be adjustable in the freestanding rack.
Wall mounted shelving shall be supplied in the amount specified. Shelving material shall be chrome plated or stainless steel and shall be manufactured to high quality standards to be free of burrs, sharp edges, and protrusions.
11.0 ACCESS PORTS
For water, drain line, air or gas lines shall be provided in the size and quantity specified:
1" 2" 3" 4"
12.0 ELECTRICAL OUTLETS
(A) Vapor-proof, duplex, 115volt, 20 amp GFI receptacles shall be installed on the inside wall 45" above floor. Each receptacle shall be wired to a terminal box on top of the room for connection by others.
(B) Other special: ________________________________________________
13.0 DRAWINGS and MANUALS
Roughing-in approval drawings shall be supplied prior to the commencement of manufacture; these drawings must be verified and approved by the customer to assure clearances, utilities, and other interfaces.
Instructions and Maintenance Manual: A complete comprehensive instruction and maintenance manual shall be provided with each room. The manual shall include sequential operating instructions, routine preventative maintenance instructions, and complete schematics.
Warranty: A warranty certificate shall be included in the manual of each supplied room.
14.0 INSTALLATION (Options)
(A) Factory supervision only of installation with labor to be supplied by others. Aegis Scientific shall furnish technical supervision for installation. The purchaser as required will supply the field labor. Aegis Scientific's field technical representative shall supervise the installation of the rooms, instruct personnel in the proper operation and preventative maintenance, and shall field check the equipment on start-up.
(B) Complete Installation: Aegis shall deliver and erect the environmental room factory supplied equipment and will have the following responsibilities:
1) Delivery of rooms to their final destination.
2) Assemble rooms complete in place.
3) Interconnect all refrigeration piping and electrical wiring, which are an integral part of the room assemblies
4) Start-up and field-test the room operation.
NOTE: Aegis will not in any way be responsible for altering existing building walls, conditions
or utility services.
It will be the customer's responsibility to provide the following on a timely basis:
1) Make the area completely ready for proper and efficient installation of the room(s). The site location floor must be made flat and level. The site area must be made clear of all partitions, piping, obstructions and loose articles preventing the ready erection and assembly of the environmental room(s) and support equipment.
2) Furnish the specified electrical service to the local vicinity of the room, including a fused disconnect. Final connection will be made by the customer at the Aegis designated terminal connection.
3) Provide floor drains and or condensate removal pump system to remove room drainage.
4) Provide water supply and return line, if required, and make final connections.
5) Provide any other special utilities and service connections.
6) Provide all building wall, roof, or floor penetrations.
15.0 VALIDATION
The temperature accuracy and uniformity inside the completed room shall be measured using 16 thermocouple probes. The probes shall be placed throughout the internal workspace at strategic locations no closer than 12 inches from any surface. The probes shall be calibrated in a 0.1 C water bath using an NT traceable thermometer. Test data shall be recorded on a Digital Data Acquisition Recorder system and turned over to operating personnel.
16.0 Factory Acceptance Test Plan
Aegis will perform a factory test and inspection on all major components to assure basic quality, conformance of design and functional operation.
Each Control Console will be bench tested using a simulator panel to test all logic functions, control systems function, and alarm operations. Each Condensing Unit and Air Unit will be pressure tested for leaks and checked for design conformance. When required the customer may elect to be present for factory checkout.
