Grindmaster Coffeemaker 67710E User Manual

American Metal Ware® Coffee Urn  
Installation, Operation & Service Manual  
For  
Model 67710E  
TABLE OF CONTENTS  
Warning Labels.......................................2  
Introduction.............................................3  
About the 67710E Coffee Urn..................4  
General Description.....................4  
X
Electric  
Steam  
Features of This Model................4  
Pre-Installation........................................5  
Package Contents.......................5  
Rough In Drawing....................................6  
Installation...............................................7  
Initial Considerations...................7  
Complete the Hook Up................8  
Initial Start Up..............................9  
Operation..............................................10  
Load the Coffee.........................10  
Start the Brew............................10  
After the Brew is Finished..........11  
Adjustments..........................................12  
Bypass Adjustment....................12  
Thermostat Adjustment..............12  
Timer Adjustment.......................13  
Flow Rate Adjustment................13  
Fill Rate Adjustment...................14  
Cleaning................................................15  
After Each Use...........................15  
Each Day...................................15  
Semi-Weekly..............................15  
Wiring Diagram......................................16  
Special Features  
After completing installation and set-up, the  
equipment owner should keep this manual for  
future reference.  
Grindmaster Corporation™  
4003 Collins Lane  
Louisville, Kentucky 40245 USA  
(502) 425-4776  
(800) 695-4500 (USA and Canada only)  
(800) 568-5715 (technical service only)  
FAX: (502) 425-4664  
© Grindmaster Corporation™, 1996  
PRINTED IN USA  
1104 Form # AM-320-02  
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Introduction  
Thank you for purchasing this American Metal Ware product. American Metal Ware has  
been building beverage equipment since 1883. This product has been designed for the  
quality and cost conscious restaurant operator in mind. Our metal craftsmen proudly build  
each product with great attention to detail.  
This manual has been prepared to compliment your equipment. Take a few minutes to  
become familiar with the equipment before you start operation. Within, you will find  
information on the set-up, operation, and maintenance of the equipment. This information  
will help you use this equipment to produce the best possible beverage product.  
The installation and setup instructions will help get the equipment running quickly. You will  
also learn the functions of all controls. Follow the cleaning and maintenance instructions  
to ensure a long life for your equipment and to preserve its attractive appearance. If this  
product requires service or adjustment, see the Adjustment section of this manual. This  
section will explain the safest and easiest procedures for finding and making adjustments.  
A repair parts section will help you identify the parts you need.  
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About the 67710E Coffee Urn  
General Description  
This coffee urn has been engineered to suit the special needs of the prison environment.  
This section highlights the characteristics and special features of the product.  
The urn is a large capacity, high-speed, coffee brewing and holding unit. The body is  
constructed of two walls of stainless steel with insulation between. Inside is a large  
capacity water tank where the brew is heated. Two ten gallon liners fit into that tank. Each  
liner has its own controls which start and stop the brew process with the push of a button.  
A pump draws water from the tank and sprays it over the grounds which are placed above  
the liners. Faucets on the front of the urn allow the dispense of coffee from each liner and  
hot water from the tank. A control automatically refills the tank as water is drawn off. A  
thermostat regulates the temperature by switching electric heating elements inside the tank.  
Features of This Model  
Safety and Security  
• No parts removable by hand.  
• No breakable parts.  
• Minimization of screw fastened parts on exterior. All remaining screws are one way.  
• Lockable covers over control compartment and brewing area. When locked, there is  
no access to hot water or coffee except through faucet.  
• Security faucets with wrench tight, metal bonnets and self closing handles.  
• Insulated body stays cooler.  
• Lock our brew controls.  
• Drain handle located inside control enclosure.  
• Flanged feet may be bolted to table.  
Operation  
• Fully automatic brew cycle with automatic air agitation.  
• Adjustable timer, by-pass, sprayover rate, and thermostat.  
• Sensors indicate coffee in liner - no gauge glass.  
• Automatic Refill and Low-Water, Heater Cutoff.  
• Stainless steel mesh coffee filter.  
• High Speed Brewing - Brew in both liners simultaneously.  
Maintenance  
• All components are easily accessible in the side control enclosure.  
• Replace most components without draining the urn.  
• Durable, easy to clean, 304 stainless steel construction.  
American Metal Ware 67710E Coffee Urn  
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Pre-Installation  
Package Contents  
This coffee brewer should be packed in a box on a wooden skid. Check to make sure the  
box contains the following parts:  
1) The Urn  
2) Two stainless steel mesh brew baskets.  
3) Three pad-locks and one set of three identical keys.  
4) This instruction manual.  
5) Two clamps for pump tubing - in the control enclosure.  
6) Two sets of two keys to turn on brew controls.  
The next page shows a rough-in drawing, number 094-004. Refer to this drawing for  
information required for installation. The drawing shows the locations of the electric and  
water inlets, and some important dimensions of the brewer.  
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American Metal Ware 67710E Coffee Urn  
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Installation  
WARNING, ELECTRIC SHOCK HAZARD  
INSTALLATION SHOULD BE PERFORMED BY QUALIFIED  
SERVICE PERSONNEL ONLY.  
!
Initial Considerations  
Unpack the Urn  
Remove the cardboard carton from around the urn. Be careful not to scratch the stainless  
steel with any tools. Unwrap any plastic wrapped items. Open both liner covers and  
remove materials inside the liners. Remove the control enclosure to expose electric  
connections.  
Select a sight for the urn  
The Urn must be placed on a sturdy, leveled table. The table must have a tray to collect  
liquid from the faucets. To set up initially and adjust later, the installer must have access to  
the side of the urn where the controls are located. Be sure to allow for space in the sight  
selection.  
Water and Electric  
The electric ratings are printed on the nameplate of the urn and on the rough-in drawing.  
The urn must be connected to a branch circuit with its own shut-off.  
A water line must be run to the connection location. The urn has a 3/8” NPT water inlet as  
shown on the rough-in drawing. Use 3/8” OD copper tubing for the connection. For  
especially long runs where pressure drop is likely to be a problem, use larger tubing. The  
water line should have a shut-off valve near the urn. The water pressure at the urn should  
be between 30 and 70 psig.  
Softened water does not make good coffee. For best results, use cold tap water. Cold  
water will require a recovery time between brews. You may connect hot water if it is  
necessary to brew in both liners continuously. Chlorine and lime in water are the biggest  
problems in the operation of coffee brewers. Be sure the water is free of chlorine which will  
deteriorate the stainless steel. Filters may be purchased to help control lime. American  
Metal Ware’s warranty does not cover water problems.  
Place Urn  
Position the urn on the table in its operating position. Level the urn front to back and left to  
right. The height of the feet is adjustable for this purpose.  
Complete the Hook Up  
Water Hook-Up  
The water connection is on the back of the urn’s control enclosure - see figure 1.  
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It is a 3/8 Female NPT connection.  
See the rough-in drawing for details on  
location. You may wish to install a  
water line filter to inhibit lime deposits  
especially if your area has particularly  
hard water. Lime, which precipitates as  
the water is heated, will eventually  
build up inside the urn.  
Electric Hook-Up  
Before starting any work, be sure the  
electric line has been turned off. Check  
the nameplate on the urn for the elec-  
tric ratings of the urn. A wiring diagram  
is also provided inside the control  
enclosure and in this manual. Use the  
appropriate circuit breaker and cord for  
the electric service that this urn that  
requires. Secure the cord to the rear of  
the control enclosure with the  
appropriate cord grip bushing. The hole  
for electric connection is located on the  
rear of the urn’s control enclosure as  
shown in figure 1 and on the rough-in  
drawing.  
Electric Inlet  
3/8” FPT  
Water  
Inlet  
Figure 1, Service Hookup Locations  
Wire the cord to the terminal block and  
the ground connection shown in figure  
2. Be sure the connection is secure  
and no strands touch adjacent wires.  
Figure 2, Terminal Block  
American Metal Ware 67710E Coffee Urn  
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Initial Start Up  
Now that the brewer is connected, it can be started and checked.  
• Leave the access cover open.  
• Turn on the water supply.  
• Turn on the electricity to the urn.  
The urn will now begin to fill. The heaters should still be off. When the water level is above  
the heaters, the contactor will close to turn on the heaters.  
Check for leaks in the water connection and inside the control enclosure. Assuming all is  
working correctly, close the control enclosure and allow to finish filling. An indicator light  
labeled FILLING is lit while the fill valve is open. When the light turns off, the urn is full.  
The urn will take approximately 15 minutes to fill.  
If cold water is used, the heat-up time is approximately 30 minutes depending on the  
electric ratings of the urn. An indicator light labeled WATER HOT will turn on when the  
heaters have shut off.  
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Operation  
Now that the urn has been installed and started up, it is ready for operations. This section  
describes the brew process from start to finish. Before brewing the first batch of coffee,  
follow the procedure outlined here to brew an initial batch of water only into each liner. This  
will rinse the components and set the gaskets and seals.  
Load the Coffee  
Remove the pad lock which secures the liner cover over the liner into which you want to  
brew.  
Lift the cover to expose the brew basket. Note that the brew basket has a mesh bottom  
so filter paper is not required.  
If there are used grounds in the basket, dispose of them and rinse the basket  
Fill the brew basket with the proper  
amount of ground coffee to brew  
ten gallons. Pour the coffee directly  
into the basket - do not use filter  
paper. See the following section for  
instructions on the amount and grind  
of coffee.  
WATER HOT  
FILLING  
Check the liner. The liner should be  
empty and clean before brewing a  
batch. If the liner is not empty, it  
will overflow when brewing.  
Place the brew basket over the liner  
and close the lid. You may padlock  
the lid at this time to prevent  
tampering.  
COFFEE IN LINER  
BREW LOCK  
BREW LIGHT  
START  
STOP  
Start the Brew  
Turn the brew lock key to ON for  
the liner you are brewing to.  
Check the WATER HOT light to be  
sure the water is up to temperature.  
If the light is off, wait a few  
moments for the urn to finish  
heating.  
Be certain to close the cover over  
the liner you wish to use.  
Press the START switch for the  
liner you are brewing to.  
Figure 3, Brew Controls  
American Metal Ware 67710E Coffee Urn  
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• The pump will run for 12 1/2 minutes to spray over the water required for 10 gallons of  
coffee. The BREW light stays on while the pump is running. As water in the tank is  
used, it is refilled automatically. The FILL light indicates that the fill valve is open. The  
light should alternate on and off, even when brewing to both sides. If the FILL light stays  
on during the brew cycle, see the Adjustment section for instructions on speeding the  
fill rate.  
• Press the STOP switch if you need to stop the brew. The timer will reset when STOP is  
pressed, so be sure the liner is empty before you press START again.  
After the Brew is Finished  
When the brew cycle has automatically shut off, you should have ten gallons of coffee. The  
level will be higher in the liner if you brew with no grounds. If the level is not correct, see  
the Adjustment section.  
• Allow about two minutes for the grinds to stop dripping.  
• CAREFULLY open the liner cover.  
• Remove the brew basket, dispose of the used grounds, and rinse the basket.  
• Replace the basket on top of the liner and close the lid. The lid may be locked again.  
• Monitor the level of coffee by checking the flashing light labeled COFFEE IN LINER  
WHEN LIT. If this light is flashing, the liner is almost empty.  
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Adjustments  
WARNING, ELECTRIC SHOCK HAZARD  
INSTALLATION SHOULD BE PERFORMED BY QUALIFIED  
SERVICE PERSONNEL ONLY.  
!
Bypass Adjustment  
See figure 4.  
Each liner has an independent bypass which is adjustable. The  
Bypass valve controls the ratio of water sprayed over the  
grounds to the water poured directly into the liner -bypassing the  
grounds.  
The urn is shipped from the factory with the bypass open  
3 1/2 turns. This means approximately 25% of the water  
Figure 4, Bypass Valve  
bypasses the coffee grounds. See the next section on Brew Techniques about the effect of  
bypass on coffee.  
If you desire more of the water to go through the coffee grounds, close the valve. Open the  
valve to allow more water to bypass the coffee. Each liner’s valve must be adjusted  
separately. You may need to adjust the brew timer slightly if you adjust the bypass to  
maintain the correct volume.  
Thermostat Adjustment  
See figure 5.  
The thermostat controls the temperature of the water  
in the tank by switching the heater contactor on and off.  
A capillary tube monitors temperature near the heaters.  
The thermostat is calibrated such that when the shaft is  
turned all the way on, the temperature is 200 degrees  
Fahrenheit.  
Adjustment  
Screw  
To change the water tank temperature:  
• Turn off power to the urn.  
• Remove the control enclosure access cover.  
• Locate the thermostat shaft inside the control  
enclosure.  
Figure 5, Thermostat  
Page 12  
• Turn the shaft full on.  
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To Change the Water Tank Temperature (cont)  
Insert a miniature, flat screwdriver into the center of the shaft.  
Turn the screw slightly to make adjustments: clockwise to increase the  
temperature, counterclockwise to lower.  
Turn the power back on and allow the temperature to equalize. The water  
hot light turns on when the heaters are off.  
Check the water temperature inside the tank. Repeat adjustment if needed.  
Timer Adjustment  
See figure 6.  
Timer  
Adjust  
Two timers control the brew cycle including the air agitation.  
When a start switch is pressed, the timer sends power to the  
pump through the normally open contact. Also, the brew  
light is turned on. These stay on for the set amount of time.  
After the time is up, the air agitation turns on to stir the  
coffee.  
Figure 6, Brew Timer  
The time is set by turning an adjustment potentiometer,  
see figure 6. This potentiometer is factory set to spray for 12 1/2 minutes.  
To Adjust the Timer:  
Turn off power to the urn.  
Remove the control enclosure access cover.  
Locate the timer you need to adjust.  
Find the marked adjustment potentiometer on the front of the timer.  
Insert a screwdriver and turn the potentiometer to the approximate time you need.  
Restart the brewer and measure the time of a brew - start button pressed to  
sprayover stop.  
Re-adjust the potentiometer to make fine corrections if needed.  
Flow Rate Adjustment  
See figure 7.  
Spray Over Rate  
Control  
Two valves - one for each liner - control the flow rate of water  
from the pump to the sprayover. They have been factory set to  
provide proper rate for a twelve minute brew time. Only adjust  
these if the rate has obviously come out of adjustment.  
To Adjust the Rate:  
• Turn off all power to the urn.  
• Remove the control enclosure access cover.  
• Locate the valve to the liner you want to adjust.  
• Open the valve slightly for faster sprayover, close  
for slower sprayover.  
Figure 7, Flow Valve  
• Turn the urn back on and wait for the water hot light to turn on.  
• Brew water into the liner for the standard 12 1/2 minutes. Adjust the  
timer if it does not run the pump for the correct time.  
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To adjust the rate (cont)  
The level in the liner should be one inch below the line where the  
liner ring attaches to the liner wall.  
Re-adjust until the level is correct.  
Fill Rate Adjustment  
The fill rate depends on the water line pressure and the  
opening of the FAST FILL VALVE, see figure 8. If the urn  
does not refill as fast as it uses water during a brew cycle, you  
may adjust the fill rate. If you adjust for maximum fill rate and  
the level still cannot keep up, either the pressure is too low or  
the fill system may have a clog. See Troubleshooting.  
Figure 8, Fill Rate Valve  
To Adjust the Fill Rate:  
Remove the control access cover.  
Locate the needle valve labeled, FAST FILL VALVE.  
Open the valve a few turns.  
Brew water into both liners simultaneously. Watch the  
FILLING indicator.  
If the light cycles on and off, the rate is fast enough.  
If the FILLING light stays on, the rate is too slow. Re-adjust.  
American Metal Ware 67710E Coffee Urn  
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Cleaning  
Cleaning your coffee brewer will help the machine last longer, produce better coffee, and  
keep its attractive appearance. Cleaning regularly does not take much time. Follow these  
steps for daily and weekly cleaning. Cleaning brushes may be purchased from American  
Metal Ware or your restaurant equipment dealer. Do not use soap, scouring powders, or  
abrasive materials to clean your equipment. These will damage the stainless steel finish.  
After Each Use  
Empty and rinse brew basket.  
Drain and rinse urn liner.  
Add some hot water to liner and brush liner interior. To add small amounts of hot  
water to liner, close cover and press start and stop switches to control amount.  
Rinse again and urn is ready for next brew.  
Each Day  
Brush urn liner well, rinse well.  
Wipe exterior surfaces with a damp rag. The stainless steel may be cleaned with  
stainless steel cleaner.  
After the last use and cleaning, fill brew water into the liners to help any coffee oils  
from staining the metal.  
Semi-Weekly  
Clean the liners with urn cleaner, never use bleach or chlorine based products on  
stainless steel.  
Fill the liner 3/4 with hot water. Follow the cleaner’s instructions and allow to stand  
in hot urn for 30 minutes.  
Coffee brewer cleaners which have been used successfully:  
DIP-IT from Economics Laboratory, White Plaines, NY  
OXYLITE from Avril, Inc., Syndet Division, Reading, PA  
TEMP-KLEEN from Caddy Corp. of America, Pitman, NJ  
Scrub inside the liner with a long handled brush. Clean the nut in the bottom  
of the liner.  
Be sure the liner is empty. Remove the bonnet, or the cap and handle part, of the  
coffee faucets. Brush inside of the faucet body. Clean the silicone faucet seal.  
Also, with the liners empty, remove the coffee faucets from their shanks. Brush  
clean the tube interior which leads to the center of the liners.  
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American Metal Ware 67710E Coffee Urn  
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Notes  
American Metal Ware 67710E  
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Grindmaster® Coffee Grinders and Brewers • Espressimo® Espresso Machines • Crathco® Hot Beverage Dispensers  
Crathco® Cold and Frozen Beverage Dispensers • American MetalWare® Coffee and Tea Systems  
Tel (502) 425-4776 • Fax (502) 425-4664 • 1-800-695-4500  
P.O. Box 35020 • Louisville, KY 40232 • USA  
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