AA-50497 Coffee Maker, Electric, Automatic

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11 September 1990
The General Services Administration has authorized the use of
this commercial item description as a replacement for W-C-500B
which is canceled.
Abstract. This commercial item description covers coffee makers comprising bowl
units (metal or glass) with 12 cup (60 ounce) minimum brewing capacity. The
coffee maker includes a thermostatically controlled heat exchanger or
electrically heated tank to make available hot water for continuous operation.
The automatic coffee makers covered herein are intended for dispensing limited
quantities of coffee in mess halls, cafeterias and classes. Types, classes,
styles and model are as follows:
Type I - Tank Type.
Type II - Tankless, heat exchanger type.
Class 1 - Fixed unit, automatic, water hook-up.
Class 2 - Moveable unit, pour-over, no water hook-up.
Style A - Glass decanter.
Style B - Metal decanter.
Model S - Single brewing head.
* Beneficial comments, recommendations, additions, deletions, clarifications,*
* etc. and any data which may improve this document should be sent to:
* Commanding Officer (Code 156), Naval Construction Battalion Center, Port
* Hueneme, CA 93043, by using the self-addressed Standardization Document
* Improvement Proposal (DD Form 1426) appearing at the end of this document *
* or by letter. FSC 7310
FSC 7310
Approved for public release; distribution is
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Salient Characteristics.
The coffee maker shall consist essentially of an enclosed counter-top stand with
an electric heat exchanger or a tank containing an immersion electric heating
element thermostatically controlled to maintain the water temperature. The
coffee maker shall also include, but not be limited to, the following:
A method for regulating water flow through a brewing cartridge
holding a measured amount of ground coffee.
A decanter for receiving liquid coffee.
An electric hot plate or plates to maintain the desired temperature of
the brewed coffee.
1. Tank. The hot water tank of type I coffee maker shall be up to 2-gallon
capacity, shall be formed of copper or austenitic stainless material conforming
to ASTM A 240, and shall have a readily removable immersion heater. The fresh
water intake of the tank shall be so located as to minimize incoming cold water
from mixing with hot water at the top of the tank or shall be provided with
baffle plates to accomplish this purpose. When a pressurized tank is provided,
the tank shall conform to the ASME "Boiler and Pressure Vessel Code, Section
VIII, Pressure Vessels, Division I, Unfired Steam Boilers."
2. Immersion heater. The electric immersion heater shall be of sufficient
wattage to raise the temperature of the tank water to brewing temperature.
The heater shall be thermostatically controlled and removed easily with the use
of simple tools for cleaning or replacement. Sheathed heating elements shall
comply with UL 1030.
3. Heat exchanger. The heat exchanger of type II coffee maker shall have a
water flow rate of at least 25 ounces per minute, and shall heat the water to
brewing temperature. The heat exchanger shall be thermostatically controlled
and be easily removed with simple tools for cleaning or replacement.
4. Flow control. Unless otherwise specified (see ordering data), an automatic
flow control for a line water pressure of 20 pound-force per square inch (psi)
to 120 psi shall be provided for fixed units to control the brewing time between
the limits of 2 and 4 minutes. A means of regulating the liquid coffee level
shall be provided.
The amount of water poured into the opening provided shall be sufficient to
yield a minimum 12 cups of brewed coffee of the strength desired.
5. Warming stove. The coffee maker shall include an electric warmer on which
the decanter rests when it is placed underneath the brewing cartridge. Recessed
heating elements or other guides shall be furnished for automatic positioning of
the decanter beneath the brewing cartridge. When specified (see ordering data),
additional warming stoves shall be incorporated in the unit or attached to the
unit. The attachable warming stoves shall be of the same manufacture and
compatible with the main unit. When specified (see ordering data), one or more
three-heat warming stations shall be furnished to boil water. Individual
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colored pilot lights shall indicate when each warmer switch is energized. When
specified for railroad or shipboard use (see ordering data), guardrails shall be
furnished to prevent decanters from sliding off the warmer.
6. Casing. Unless otherwise specified (see ordering data), the entire coffee
maker, hot water tank or heat exchanger, warmer, thermostat, and switches shall
be enclosed in a minimum 0.024-inch thick casing and constructed of austenitic
stainless material conforming to ASTM A 167.
7. Water Filter. A water strainer shall be incorporated in the incoming water
line as close as possible to the tank or heat exchanger. Proper flow direction
shall be indicated by arrows and wording on the strainer. When specified for
hard-water areas (see ordering data), an ion exchanger water treatment device or
other water softening device shall be furnished.
8. Safety devices. Unvented water tanks shall incorporate a high limit heater
safety device, or a combination high temperature-and-pressure relief valve,
fusible plug or link, or burn-out heating elements.
9. Decanter. The style B decanter receiving the freshly brewed coffee shall
conform to the requirements specified for lower stainless steel bowls of
A-A-1078, unless otherwise specified (see ordering data). Each model S coffee
maker shall be furnished with one decanter. Unless otherwise specified (see
ordering data), each warming stove and each three-heat warming station shall be
furnished with one stainless material decanter. Unless otherwise specified (see
ordering data), the style A decanter shall be the manufacturer's standard 12 cup
capacity glass decanter. The glass shall be annealed heat resistance,
thermo-shock-proof that is capable of withstanding the thermal resistance
without damage.
10. Spray head. The spray head or water outlet shall be located in the upper
portion of the casing, above the warming stove, and shall be designed to
distribute water uniformly over the ground coffee in the brewing cartridge. The
model S coffee maker shall have a single brewing head.
11. Brewing cartridge. A brewing cartridge of austenitic stainless material
equipped with perforated or wire grid shall be firmly positioned at spray head
or water outlet to receive the hot water. Shaped outer walls shall direct the
freshly brewed coffee into the bowl neck. The cartridge shall be designed for
quick attachment and detachment. A disposable paper filter or filter bag
holding coffee shall fit snugly against the grid walls of the cartridge and
shall be large enough to contain at least 2 3/4 ounces of ground coffee without
overflowing at the maximum flow rate.
Unless otherwise specified (see
finely ground coffee are placed
mix with the ground coffee at a
(60 ounces) of liquid coffee in
ordering data), when 2 1/2 to 2 3/4 ounces of
in the brewing cartridge, the hot water shall
rate sufficient to yield a minimum of 12 cups
4 minutes or less.
12. Volume regulator. An automatically controlled mechanical or electrical
means shall regulate the volume of hot water flowing through the spray head. The
device shall be adjustable to give the predetermined volume of coffee in the
receiving decanter. A heat resistant plastic handle or switch shall be at a
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location convenient to the operator and provide means for emergency shut-off of
water in the event of overflow or other malfunction. For class II coffee
makers, the amount of cold water poured into the tank opening shall yield the
desired volume and strength of coffee in the receiving bowl.
13. Temperature control. The type I electric immersion heater shall be
controlled by a thermostat designed to maintain the tank water operating
temperature at 200 degrees Fahrenheit (oF) +/-5oF at sea level pressure. For
high-altitude operation, the thermostat shall be adjustable down to 175oF.
Operating temperature shall be reached in less than 21 minutes for 115 volt (V)
heaters and less than 11 minutes for 230V heaters. Temperature recovery time
after brewing a full bowl of coffee shall be less than 5 minutes for 115V
heaters and less than 3 minutes for 230V heaters. The II coffee maker water
temperature shall be controlled by a thermostat adjustable over a range for
delivery of water at 200oF +/-5oF at sea level to 175oF at high altitude.
14. Temperature maintenance. The electric warming stoves shall maintain a full
decanter of liquid coffee at a temperature of 185oF to 190oF without variation.
15. Design. The coffee maker shall be so designed that normal adjustments and
repair can be readily accomplished by means of general purpose tools with a
minimum removal or disturbance of other elements of the unit.
All buttons, switches, and indicators shall be located on the front or top of
the casing. The coffee level indicator adjustment and temperature adjustment
shall be located where adjustment can be readily accessible.
16. Coffee filter. The filter shall be held on a cartridge designed to direct
the hot water towards the center of the ground coffee. The cartridge shall
direct the flow of freshly brewed coffee directly into the decanter beneath it.
The filter shall be made of disposable paper or fabric.
17. Legs. Unless otherwise specified (see ordering data), the entire unit
shall be on 1 1/2-inch or 4-inch high adjustable legs, unless the construction
involved in the manufacturer's standard practice requires a solid casing
enclosure support. The legs or support shall have holes drilled in the base so
that the unit can be bolted to a counter.
18. Water dispensing system. Unless otherwise specified (see ordering data),
the water dispensing system shall include the following:
Type I, class 1, coffee makers shall be constructed to be converted
from automatic to a pour-over unit. The pour-in opening shall be
located on top of the coffee maker in accordance with the
manufacturer's standard practice.
Type I, class 1 and type II, if applicable, coffee makers shall
include a self-closing, non-drip draw-off faucet for dispensing hot
water. The faucet shall be located on the unit as recommended by the
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19. Electrical requirements. Unless otherwise specified (see ordering data),
the coffee maker shall be designed for operation on 120/240V, single phase
alternating current (ac). The pilot lamp, warming stove, liquid level regulator
(when furnished), and accessory stoves shall operate on a nominal 115V ac. The
terminal block, power cord, and plug, as applicable, shall conform to UL 197.
Each warmer station shall be controlled with a separate on-off switch. The
coffee maker shall not present a risk of electric shock when tested as specified
in accordance with UL 197.
20. Finish. The exterior surfaces of the unit shall be in accordance with the
manufacturer's standard practice except that austenitic stainless material
surfaces shall be No. 3 finish or better.
21. Identification markings. Identification shall be permanently and legibly
marked directly on the coffee maker and components, or on a corrosion-resisting
metal place securely attached to the unit at the source of manufacture.
Identification marking shall be in accordance with UL 197 and shall include, but
not be limited to, the manufacturer's model, serial number, name, electrical
rating, date of manufacture, and plumbing requirements, if applicable.
When specified (see ordering data), military markings for each coffee maker
shall be furnished. The coffee maker shall be equipped with instruction plates
suitably located, describing any special or important procedures to be followed
in operating and servicing the equipment. Plates shall be of a material which
will last and remain legible for the life of the equipment. Manufacturer's
standard commercial publications shall be furnished.
Standard Compliance. The coffee maker and warming stove shall meet the
applicable requirements of UL 197, UL 1030 and NSF No. 4.
Certification. Prior to approval of the first shipment, the contractor shall
submit for the approval to the contracting officer, or his authorized
representative, satisfactory evidence that the coffee maker he proposes to
furnish under this CID meets the requirements of UL 197, UL 1030 and NSF No. 4.
UL Certification. Acceptable evidence of meeting the requirements of UL 197 and
UL 1030 shall be the UL label, UL listing marking, or a certified test report
from a recognized independent testing laboratory. Such evidence must be
acceptable to the contracting officer.
NSF Certification. Acceptable evidence of meeting the requirements of
NSF No. 4 shall be the NSF seal on the finished coffee maker and a listing in
the NSF Seal of Approval Listing of Food Service Equipment, or a certified test
report from a recognized testing laboratory, acceptable to the contracting
officer with the advice of the Army Surgeon General.
Contractor certification. The contractor shall certify and maintain
substantiating evidence that the product offered meets the salient
characteristics of this commercial item description, shall be the manufacturer's
standard commercial product, and conforms to the producer's own drawings,
specifications, standards, and quality assurance practices. The Government
reserves the right to require proof of such conformance prior to first delivery
and thereafter.
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Metric products. Products manufactured to metric dimensions will be considered
on an equal basis with those manufactured using inch-pound units, provided they
fall within the tolerances specified using conversion tables contained in the
latest revision of FED-STD-376, and all other requirements of this Commercial
Item Description are met.
If a product is manufactured to metric dimensions and those dimensions exceed
the tolerances specified in the inch/pound units, a request should be made to
the contracting officer to determine if the product is acceptable. The
contracting officer has the option of accepting or rejecting the product.
Preservation, packing, and marking. Unless otherwise specified in the contract
or order, the preservation, packing, and marking shall be in accordance with
ASTM D 3951.
CID based part identification numbers. The following part of identification
numbering procedure is for Government purposes and does not constitute a
requirement for the contractor.
A - 50497 - X
A - Glass Decanter
B - Metal Decanter
1 fixed unit
2 moveable unit
1 tank type
2 tankless type
CID Number
Designates a CID
Ordering Data.
Acquisition documents should specify the following:
Title, number, and date of this specification.
Type, class, style, and model of coffee maker required.
When a line water pressure for an automatic flow control is other
than as specified.
When additional warming stoves are required and the quantity to be
When three-heat warming station(s) for boiling are required and the
quantity to be furnished.
When guardrails shall be furnished for railroad or shipboard use.
When materials for the casing are other than as specified.
When a water treatment device is required.
When style B decanters are other than as specified.
When quantity of stainless steel decanters are other than one per
stove or station, and the quantity to be furnished.
When glass decanters shall be other than as specified.
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When coffee brewing is other then specified.
When the height of legs are other than as specified.
When water dispensing system is other than as specified.
When electrical requirements are other than as specified.
When military identification is required and the information is to be
When level of preservation, packing and marking required is to be
other than specified herein.
ASTM A 240, A 167 and D 3951 are available from the ASTM, 1916 Race Street,
Philadelphia, PA 19103.
UL 1030 and 197 are available from Underwriters Laboratories (UL), Inc.,
333 Pfingsten Road, Northbrook, IL 60062.
ASME Code for "Unfired Steam Boilers" is available from the American Society of
Mechanical Engineers (ASME), United Engineering Center, 345 East 47th Street,
New York, NY 10017.
NSF No. 4 is available from the National Sanitation Foundation (NSF),
3475 Plymouth Road, P.O. Box 1468, Ann Arbor, MI 48106.
FED-STD-376 and A-A-1078 are available from the Standardization Documents
Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19120-5099.
Army - GL
Navy - YD
Air Force - 99
Review Activities:
Army - MD
Navy - MS, CG
Air Force - 84
Navy - YD
(Project 7310-0781)
User Activities:
Navy - MC, SA