Grindmaster Coffee Grinder AT 2W AT 2WE User Manual

AUTO-SERIES BREWERS  
Installation, Operation, and Service Manual  
TABLE OF CONTENTS  
Warning Labels .............................................3  
Water Connection .........................................4  
Installation Instructions ..................................4  
Coffee Preparation Procedures .......................5  
Brew Volume Adjustment ..............................5  
Brew Basket Rail Adjustment ..........................5  
Spare Parts List .............................................. 6  
Water Tank Assembly Drawing .......................7  
AT-2W/AT-2WE Drawing ................................8  
AT-AP/AT-APE Drawing...................................9  
AT-3WR/AT-3WRE Drawing ..........................10  
AT-TC/AT-TCE Drawing .................................11  
Troubleshooting Guide ................................12  
Component Replacement Instructions ..........13  
Model AT-2W/AT-2WE  
Model AT-AP/AT-APE  
Prior authorization must be obtained from  
Grindmaster Corporation™ for all warranty claims.  
Model AT-3WR/AT-3WRE  
Model AT-TC/AT-TCE  
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, 2007  
PRINTED IN THAILAND  
0307 Form # BW-340-01  
Part # 73254  
 
WARNING LABELS  
The following warning labels were on your dispenser when it was shipped from the factory. They should remain on your  
dispenser in good, readable condition at all times. If one of your labels is missing or damaged, order a replacement label  
immediately.  
Part # 71509 (for warmer models only)  
Located near warmer plates  
Part # 71582  
Located on rear and top access panels  
Part # 70248  
Located on front, behind server  
Part # 71949 or 71149  
Located on brew basket  
CAUTION  
Hot liquid in brew  
basket could cause  
burns.  
Remove with care.  
Part #71949  
Part #71149  
Auto Series Brewer Manual  
Page 3  
 
WARNING - Read and follow installation instructions before plugging or wiring in machine to electrical circuit.  
Warranty will be void if unit is connected to any voltage other than that listed on the name plate.  
ƽ
FILL BREWER TANK WITH WATER BEFORE CONNECTION TO POWER SUPPLY  
WATER CONNECTION  
The following is required for water hook-up:  
1) A quick disconnect water connection or enough coiled tubing so the machine can be moved for cleaning  
underneath. (required for NSF approved water hook-up)  
2) A 1/4" male flare adapter is provided to be attached by the installer to the back of the machine for hook-up to  
water supply.  
3) Installation to a water filter system is required to prevent lime and scale build up in the machine.  
4) Water pipe connections and fixtures directly connected to potable water supply shall be sized, installed, and  
maintained in accordance with Federal, State, and Local codes. (required for NSF approved water hook-up)  
5) Equipment is to be installed with adequate backflow protection to comply with applicable Federal, State,  
and local codes. (required for NSF approved water hook-up)  
Minimum water pressure to the machine: 30 psi (2.0 bar)  
Maximum water pressure to the machine: 80 psi (5.6 bar)  
INSTALLATION INSTRUCTIONS  
1) Place the decanter under brew basket, raise top evaporation cover and pour three decanters of water through the  
top pour-in opening. Water should come through the brew basket as the third decanter of water drains out of the  
pour-in basin.  
2) Brewer is shipped with thermostat turned on, (full clockwise position). Plug brewer into a dedicated, grounded  
120V/15A circuit (230V/15A circuit for E models).  
3) Allow 10-15 minutes for water in tank to heat to brewing temperature. (Hot water may drip from brew basket on  
initial thermal expansion of water in the tank). This will not occur thereafter.  
4) After water has reached brewing temperature (thermostat will click off, heating noise will stop and green ready light  
will be on) pour 1 decanter (60 oz./1.8L) of water through pour-in opening. Machine is now ready to use.  
5) Pour 1 decanter of water through pour-in opening to check for proper temperature setting with an accurate  
thermometer. Take the temperature of this water at a point below the brew basket opening at the start of the brew  
cycle and when the decanter is half full. Recommended temperature of the water is approximately 195°F (91°C) .  
6) In higher altitude locations (5,000 feet/1,500m above sea level) the thermostat may have to be adjusted lower to  
prevent boiling.  
Page 4  
Auto Series Brewer Manual  
 
COFFEE PREPARATION PROCEDURES (Pour-Over Mode)  
1) Place filter into brew basket.  
2) Put the proper amount of coffee into the filter.  
3) Slide the brew basket into holder.  
4) Place empty decanter on warmer located directly under the brew basket and turn corresponding warmer switch ON.  
NOTE: For airpots, open airpot lid, remove pump stem from airpot and place airpot opening directly under center hole  
in brew basket.  
5) Pour decanter of fresh water through pour-in opening at top of brewer.  
6) Hot water will be delivered through the sprayhead. This distributes the hot water evenly over the coffee bed within  
the brew basket. The coffee will drain from brew basket into the container below.  
7) TURN OFF WARMER WHEN NOT IN USE. (Red light indicates warmer is ON.) Not for airpot brewers.  
8) Before brewing next pot, remove brew basket from brew rails and dump filter into waste basket.  
COFFEE PREPARATION PROCEDURES (Auto Mode)  
1) Place filter into brew basket.  
2) Put the proper amount of coffee into the filter.  
3) Slide the brew basket into holder.  
4) Place empty decanter on warmer located directly under the brew basket and turn corresponding warmer switch ON.  
NOTE: For airpots, open airpot lid, remove pump stem from airpot and place airpot opening directly under center hole  
in brew basket.  
5) Press Brew switch once then release.  
6) Valve will turn on approximately 1 minute and fill pour-in basin.  
7) Hot water will be delivered through the sprayhead. This distributes the hot water evenly over the coffee bed within  
the brew basket. The coffee will drain from brew basket into the container below.  
8) TURN OFF WARMER WHEN NOT IN USE. (Red light indicates warmer is ON.) Not for airpot brewers.  
9) Before brewing next pot, remove brew basket from brew rails and dump filter into waste basket.  
10) Do not press Brew switch more than once during brew cycle.  
BREW VOLUME ADJUSTMENT  
1) Disconnect power to brewer.  
2) Remove plug on upper left side of chassis.  
3) With a flat head screwdriver, turn dial clockwise slightly to increase volume and counter-clockwise to decrease  
volume.  
4) Reconnect power and run a brew cycle to check volume.  
5) Repeat steps 1-3 if necessary.  
BREW BASKET RAIL ADJUSTMENT  
1) Disconnect power to brewer.  
2) Remove lid and pour-in basin.  
3) Loosen nuts for brew rails.  
4) Fit basket in place.  
5) Tighten nuts and check basket fit.  
Auto Series Brewer Manual  
Page 5  
 
SPARE PARTS LIST  
Item No. Part No.  
Description  
Item No. Part No.  
Description  
Decal, Main Front AT-AP, AT-TC  
Decal, Main Front W/Switch Power AT-AP, AT-TC  
Deflector, Spray HD  
1
2A  
2B  
3
73035  
73252  
07327  
71155  
73173  
70818  
70820  
73222  
Water Tank  
33A  
33B  
34  
73187-1  
73187  
06491  
06490  
07220  
70341  
73242  
71093  
73179  
73251  
73114  
73003  
71607  
71529  
73008  
73010  
73175  
73188A  
73191  
73232  
73233  
73021  
73192  
73190  
73213  
73185  
73029  
73217-1  
73217  
73031  
73001  
73002  
13029  
Clamp Hose, Nylon 1/2" ID  
Clamp, Black 5/8"  
Tubing, 5/16"ID x 1/2"OD Silicone  
Heat Exchanger Inside Tank  
Element, Heating 1400W 120V  
Element, Heating 2500W 240V  
Element, Heating 1780W 120V  
35  
Nozzle, Spray HD  
4
36  
Nut, Lock Palnut Spray HD  
Elbow, Silicone 90 deg  
5
37  
38  
Hole Plug  
39  
Pipe Adapter  
6
73037-1 Inlet Tube Assembly  
Cover, Tank W/Bracket, Thermostat  
40  
Timer Relay, 120V  
7
73186A  
61143  
73176  
73177  
05826  
73033  
71147  
61243  
73178  
73234  
60550  
73036  
62237  
100523  
62238  
100524  
73095  
73057  
73096  
73028  
73026  
73024  
73027  
73183  
73182  
71952  
73249  
62436  
61125  
70445  
73058  
73059  
73194  
Timer Relay, 230V  
8
Nut, Pipe Jam 1/8" NPT  
Fitting Brass 1/4"MFL x 3/8"MPT  
Fitting Brass 1/4"MFL x 3/8"NPT  
Tubing, 3/8"ID x 5/8"OD Silicone  
Elbow Brass, 1/8" NPT 3/8" Barb  
Grommet, White Silicone  
Grommet, Dump Valve  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
Bracket, Panel Spray HD  
Top Cover SS, AT-AP, AT-3WR  
Panel, Pour-Over Lid  
9A  
9B  
10  
11  
12  
13  
14  
15  
16  
17  
18  
Wire Hinge, Pour-Over Lid  
Nut Slotted Hex SS (size M20x1.5)  
Pan, Receiving  
Assy, Water Line to Faucet  
Top Body Assemply AT-AP, AT-TC  
Panel, Back AT-AP, AT-APE  
Valve Inlet 120V, 50/60Hz  
Valve Inlet 230V, 50/60Hz  
Bracket, Tank Base AT-AP, AT-APE  
Panel Center SS. AT-AP, AT-APE  
Panel, Back AT-TC, AT-2W, AT-3WR  
Base Tank  
Fitting, 1/4"MFL x 3/8" Barb  
Tube, Inner Braided Silicone  
Clamp Hose, Stainless  
Thermostat Regulating  
T-Stat, Hi-Limit, 120V Models  
T-Stat, 1/2" Manual Reset 230V Models  
Bracket, Hi-Limit 120V Models  
Bracket, Hi-Limit Manual Reset 230V Models  
Bracket, Water Tank  
51  
52  
19  
53  
54  
20  
21  
55  
Panel Center SS. AT-TC, AT-2W, AT-3WR  
Base Cover Panel, AT-2W  
Decal, Main Front AT-2W  
Decal, Main Front W/Switch Power AT-2W  
Panel, Warmer Top AT-2W  
Bracket, Warmer  
Gasket, Tank O-Ring  
56  
22  
Thermostat Clip Lock  
57A  
57B  
58  
23  
Leg, Support  
24  
Base Welded  
25  
Base Cover Panel, AT-AP, AT-AC  
Airpot Stopper  
59  
26  
60  
Plate, Warmer  
27A  
27B  
28  
Rail Brew, RH. Assembly  
Rail Brew, LH. Assembly  
Brew Basket  
61  
Heater, Warmer 120V, 100W  
A535-028 Heater, Warmer 220V, 100W  
62  
63  
73004  
73218A  
73079  
73080  
73078  
Top Cover SS, AT-2W  
29  
Pressure Faucet  
Top Body Assemply AT-2W  
Base Welded AT-3WR  
30  
Ready Light, Green 120V  
Ready Light, Green 230  
Brew Switch  
64  
65  
Base Cover Panel, AT-3WR  
Panel, Warmer 3RD, AT-3WR  
Decal, Main Front AT-3WR  
31  
66  
32A  
Switch Warmer Lighted 230V  
Switch Warmer Lighted 120V  
Switch Power - Optional  
67A  
67B  
68  
73181-1  
Decal, Main Front W/Switch Power AT-3WR  
Top Body Assemply AT-3WR  
Fitting Assembly 1/4MFL x 3/4Hs Brass  
73181  
73218A  
32B  
69  
61237  
Not shown:  
61530  
61453  
Power Cord, 120V  
Power Cord, 230V  
Page 6  
Auto Series Brewer Manual  
 
WATER TANK ASSEMBLY  
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Auto Series Brewer Manual  
Page 7  
 
AT-2W/AT-2WE PART LIST  
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Page 8  
Auto Series Brewer Manual  
 
AT-AP/AT-APE PART LIST  
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Auto Series Brewer Manual  
Page 9  
 
AT-3WR/AT-3WRE PART LIST  
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Page 10  
Auto Series Brewer Manual  
 
AT-TC/AT-TCE PART LIST  
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Auto Series Brewer Manual  
Page 11  
 
TROUBLESHOOTING GUIDE  
Problem  
Possible Source  
Check  
Solution  
No Hot Water  
1. Tank heater  
1. Check the voltage at the tank  
heater terminals. Voltage should be  
120V (230V for E models). Check  
serial tag for proper voltage.  
1. (A) If correct voltage is present at the tank heater  
terminals and water is not being heated, replace tank  
heater.  
(B) If voltage is not present at tank heater terminals,  
refer to step 2.  
(C) If incorrect voltage is present at tank heater  
terminals, check voltage at outlet.  
2. Hi-limit thermostat  
or main thermostat  
2. Check the voltage between the  
white wire on the tank heater  
terminal and the incoming terminal  
(black wire) on the hi-limit  
2. (A) If voltage is present on incoming terminal on the  
hi-limit thermostat but not on the outgoing terminal,  
replace hi-limit thermostat.  
(B) Check voltage between black and white wire on  
receptacle. If voltage is not present check outlet or  
circuit breaker.  
(C) If voltage is not present on incoming terminal of  
hi-limit thermostat, replace main thermostat.  
thermostat, then the outgoing  
(black wire) terminal on the hi-limit  
thermostat.  
Steaming or  
Spitting Around  
Funnel  
1. Main thermostat  
2. High altitude  
1. Thermostat contact stuck or out of  
calibration  
2. For altitude above 5,000 feet (1,500m)  
1. (A) Adjust thermostat to lower temperature setting.  
(B) Thermostat should be calibrated or replaced.  
Dripping  
1. Not siphoning properly 1. Water should flow from sprayhead freely 1. (A) Clean sprayhead holes  
(B) Check tightness of sprayhead tube.  
(C) Check brass elbow in tank for debris  
2. Replace or repair inlet valve as needed  
2. Leaky fill valve  
2. Turn off water supply to see if  
dripping stops  
Dry Coffee  
1. Filters  
1. Are correct filters being used  
1. Use correct filter  
Remaining on  
Brew Basket  
2. Not siphoning properly 2. Refer to “dripping” step 1  
2. Refer to “dripping” step 1  
3. Filter should be centered in brew basket and  
coffee bed should be level.  
3. Improper loading of  
brew basket  
3. Filter and coffee in brew basket  
Warmer Station  
1. Warmer - defective  
1. Voltage at warmer terminals should  
be 120V (230V for E models).  
1. If voltage is present on terminals, but warmer is  
not heating, replace warmer.  
2. Warmer On/Off switch 2. If voltage is not present on warmer  
terminals, check continuity of switch  
2. If switch does not make and break continuity  
when turned on and off, replace switch.  
3. All connections should be tight.  
3. Bad harness  
3. Check connections between harness  
and switch, and between switch and  
warmer.  
Overflowing  
1. Receiving container  
not completely empty  
at start of brew cycle.  
1. Operating instructions  
1. Always start brew cycle with empty container.  
2. Not siphoning properly 2. Refer to “dripping” step 1.  
2. Refer to “dripping” step 1.  
3. Adjust timer  
3. Check valve on-time with watch  
3. Refer to “Brew Volume Adjustment” section  
Low Pot Level  
1. Adjust timer  
1. Check valve on-time with watch  
1. Refer to “Brew Volume Adjustment” section  
Excessively Long 1. Lime scale build-up  
Brew Times  
1. Remove spray head deflector and check 1. Delime machine.  
nozzle.  
Little or No Water 1. Lime scale build-up  
Be sure water is turned on.  
1. Delime heat exchanger.  
2. Replace or repair inlet valve.  
From Faucet  
2. Clogged inlet valve  
If you still need help, call an authorized dealer in your area or Grindmaster Corporation’s Technical Service Department. You can reach  
Technical Service at (502) 425-4776 or (800) 695-4500 (USA and Canada only) Monday - Friday, 8:00 AM - 8:00 PM EST.  
Please have the model and serial number ready so that accurate information can be given.  
Prior authorization must be obtained from Grindmaster Corporation’s Technical Service Department for all warranty claims.  
Page 12  
Auto Series Brewer Manual  
 
COMPONENT REPLACEMENT INSTRUCTIONS  
WARNING - Disconnect power before servicing. Risk of electric shock.  
ƽ
These steps apply to replacement of TANK, TANK HEATER, and HI-LIMIT or MAIN THERMOSTAT  
1. Remove brewer lid. Disconnect electrical connectors from upper warmer plate if applicable.  
2. Remove pour in basin assembly (receiving pan).  
3. Disconnect electrical terminals and hoses as needed.  
4. Remove front two screws mounting the tank.  
5. Lift tank and lid completely out of tank.  
6. Remove two rear screws mounting tank to tank lid.  
7. Reverse steps 1-6 to reassemble new tank assembly.  
THERMOSTAT, HI-LIMIT  
1. Disconnect wires to hi-limit thermostat.  
2. Remove two screws and remove thermostat.  
3. Check continuity of the new hi limit thermostat before installing.  
4. Screw down new t-stat and reconnect wires.  
5. Make sure the hi-limit thermostat is securely mounted and that all electrical connections are tight and isolated.  
MAIN THERMOSTAT  
1. Disconnect wires and remove tank and tank lid assembly.  
2. Remove two rear screws mounting tank to tank lid.  
3. Remove screws which secure thermostat to tank lid.  
4. Loosen thumb nut securing capillary bulb.  
5. Remove grommet from top of tank lid by pressing up with thumb and pulling capillary bulb out through hole.  
6. Reverse steps 1-5 to reassemble new tank assembly.  
TANK HEATING ELEMENT  
1. Disconnect wires and remove tank and tank lid assembly.  
2. Remove two rear screws mounting tank to tank lid.  
3. Loosen thumb nut securing capillary bulb and remove bracket.  
4. Remove two brass nuts and remove element.  
5. Install new element and washers with nuts secured tightly.  
6. Inspect tank lid gasket and replace if necessary.  
7. Reverse steps 1-3 to reassemble.  
WARMER ELEMENT  
1. Remove retaining screws from warmer plate.  
2. Lift plate and disconnect leads.  
3. Remove nuts and washers holding retaining plate and warmer element to plate.  
4. Reverse steps 1-3 to reassemble.  
Auto Series Brewer Manual  
Page 13  
 
 
 
Grindmaster® Coffee Grinders and Brewers • PrecisionBrew™ Brewing Systems • Espressimo® Espresso Machines  
Crathco® Hot Beverage Dispensers • Crathco® Cold and Frozen Beverage Dispensers • AMW Coffee and Tea Systems  
Tel (502) 425-4776 • Fax (502) 425-4664 • 1-800-695-4500 (USA & Canada only)  
P.O. Box 35020 • Louisville, KY 40232 • USA  
© Grindmaster Corporation, 2007  
PRINTED IN USA  
0307 Form # BW-340-01  
Part # 73254  
 

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