Grindmaster 87710 service manual Spray-Over Time Volume Rate, Timer Adjustment

Spray-Over Time - Volume - Rate

Timer and spray-over rate are factory set as per information below. If other volumes of water or a faster or slower spray-over rate is desired, see following instructions:

Timer Adjustment

Turn adjustment knob clockwise to decrease time, counterclockwise to increase time.

Operation Start-Up Checks/Brew Cycle Adjustments

1.Turn thermostat dial to BREW position. Pilot light at top of thermostat bezel should light up when thermometer pointer is at “W” in BREW zone, this pilot light should go out. Water in urn tank is now at brew temperature. NOW and ONLY at initial start-up, we advise checking time of flow of hot water to spray nozzle.

2.CHECKING SPRAYOVER VOLUME AND RATE (REPEAT FOR EACH SPRAYARM) Remove cover from brew basket over one liner. Position spray nozzle over this brew basket. Liner should be empty and faucet shut off. Push in timer start button and brew pilot should light up. Hot water should start to spray into brew basket. Allow to spray until brew pilot light goes out and sprayover stops.

Measure amount sprayed over by drawing off into a calibrated one gallon measure. If amount is more or less than desired, reset timer. Longer time, more sprayover, shorter time - less sprayover. Each 1/4 minute increase or decrease adds or subtracts about 1/4 gallon to sprayover total. Note that setting of sprayover bypass valve (on sprayarm) affects amount of sprayover.

Further adjustment of sprayover volume can be made using the internal bypass valve located in the side pump housing. Screwdriver adjustment is under the hole plug closest to the urn body. Open the valve for less sprayover, close for more. Valve is wide open when screwdriver slot is horizontal. It is closed when slot is vertical; i.e., pointing towards sprayarm for maximum sprayover. The purpose of the internal bypass valve is to direct excess discharge from the sprayover pump back into the urn water compartment.

Factory setting is 10 gallons sprayover water in 10 minutes (1 gallon/60 seconds) and sprayover bypass valve wide open. Bypass volume is about 30% of the total sprayover, or 3 gallons.

Before actual use of urn, it should be thoroughly cleaned and washed. It is also recommended that a batch of coffee be brewed in each liner based on a final brewing cycle timer setting and actual muslin bag or filter be used. We recommend that these first batches be thrown out and not used. Strength of brew may be checked by hydrometer or evaporation tests but flavor test might be poor on the first batch.

Page 6 American Metal Ware 87710E Coffee Urn