Related Manuals for VKI Technologies Zuma Brewer
Summary of Contents for VKI Technologies Zuma Brewer
- Page 1 Zuma Brewer Operation and Service Guide Contact: Customer Service – Service à la clientèle 800.567.2951 Technical Support – Soutiens technique 888.854.0207 VKI Publication #N016352 May 2014...
- Page 2 Zuma Brewer - Operation & Service Guide Page 2...
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Page 3: Table Of Contents
Brewer Crank Tool ........................11 Cleaning the Brewer (with VKI Powdered Brewer Cleaner) ..........12 Removing the Brewer Filter Screen ..................13 Zuma Brewer Screens – 3 Types Available ................ 13 Screen Assembly Extractor Tool ..................13 Removing the Filter Screen ....................14 Installing a Filter Screen ..................... - Page 4 Zuma Brewer - Operation & Service Guide Page 4...
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Page 5: Introduction
Replacing other critical components Brewers Shipped from VKI Whether you receive a Zuma brewer as an individual assembly or incorporated into a VKI machine, it will be shipped in the closed position with the brew chamber down. This is done to accelerate the settling effects of the brewer's components - in particular, rubber seals, gaskets and spacers. -
Page 6: How The Vki Zuma Brewer Works
Zuma Brewer - Operation & Service Guide How the VKI Zuma Brewer Works When the cycle is started, the piston starts moving upwards, while the brew chamber moves down (closing) to create a seal between the bottom of the chamber and the top of the cylinder. -
Page 7: Removing The Brew Chamber
Zuma Brewer - Operation & Service Guide Removing the Brew Chamber The brew chamber needs to be removed periodically either for cleaning, or for replacing of the filter screen that is located directly beneath it. To remove the brew chamber, follow this simple procedure: 1. -
Page 8: Adjusting The Brew Chamber Tension
Adjusting the Brew Chamber Tension Proper brew chamber tension is critical for the operation of the Zuma brewer. If the tension is too high, the added pressure can result in severe damage to brewer components and the drive motor. If too low, it will result in leaks and improper cleaning of the spent coffee grounds. -
Page 9: Tension Is Too High
Zuma Brewer - Operation & Service Guide Tension is Too High The illustration below shows too much tension for the brew chamber. As the wiper is moving across the top of the filter screen, it bends or folds over. Signs that tension is too high: •... -
Page 10: To Adjust The Brewer Chamber Tension
Zuma Brewer - Operation & Service Guide To adjust the brewer chamber tension: Note: Some components are not shown to simplify the illustration 1. Make sure the brew chamber is open (up). 2. Push down on the H-frame (1). 3. Lift the T-bar out of its recession on the H-frame and turn it so that it is out of the way (2). -
Page 11: Brewer Crank Tool
By connecting the coupling on the crank tool to the coupling at the rear of the brewer, you can easily turn the brewer to the position required for servicing. Brewer Crank Tool WARNING: Never, under any circumstances, turn the Zuma brewer in a backwards direction - doing so will severely damage the brewer assembly. Page 11... -
Page 12: Cleaning The Brewer (With Vki Powdered Brewer Cleaner)
Zuma Brewer - Operation & Service Guide Cleaning the Brewer (with VKI Powdered Brewer Cleaner) To properly clean and de-stain the brewer without damaging the components, rinse the brewer using only a VKI approved brewer cleaner (VKI p/n - M019610). The use of any other types of cleaning agents may cause damage to plastic and rubber components on the brewer. -
Page 13: Removing The Brewer Filter Screen
Removing the Brewer Filter Screen The Zuma brewer is equipped with a filter screen than can be easily removed when it requires cleaning or replacing. The standard Zuma brewer uses a 40 micron brewer screen, however optional 51 micron or a stainless steel screen (approximately 37 micron) are also available from VKI. -
Page 14: Removing The Filter Screen
Zuma Brewer - Operation & Service Guide Removing the Filter Screen To remove the filter screen from the Zuma brewer: 1. With the brewer in the open position and the piston at its lowest point, remove the brew chamber. ... -
Page 15: Cleaning The Brewer Filter Screen
This accumulation will decrease the porosity of the screen, making it difficult for the liquid to flow through, resulting in brewer flooding. The Zuma brewer screen must be kept clean to prevent this from occurring. -
Page 16: Replacing The Brewer Cylinder And Teflon Seal
Replacing the Brewer Cylinder and Teflon Seal The Zuma brewer creates a vacuum that pulls hot water through the coffee grounds and the filter screen, and into the brewer cylinder. The brewer pauses prior to dispensing the brewed coffee to allow this vacuum to pull all of the liquid into the cylinder. - Page 17 Zuma Brewer - Operation & Service Guide 4. Once the screws are removed, lift the cylinder up until it clears the two guide posts on the mainframe and pull it towards you to remove it. 5. Pull down the piston to remove this assembly from the brewer cylinder. At this point, the old brewer cylinder can be discarded (but not the piston assembly).
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Page 18: Removing The Old Teflon Seal
Zuma Brewer - Operation & Service Guide Removing the Old Teflon Seal Remove the four screws at the top of the piston assembly. Remove the stainless steel top plate from the assembly. Remove the old Teflon seal. It may be necessary to twist the seal or rock it back and forth until it clears the large rubber piston ring. -
Page 19: Installing The Brewer Cylinder And Piston
Zuma Brewer - Operation & Service Guide Align the four holes on the new Teflon seal with the toothpicks inserted in step #4 and slide the seal down over the piston. Make certain the four holes on the Teflon seal and the four holes (and o-rings) on the piston are properly aligned before proceeding. - Page 20 Zuma Brewer - Operation & Service Guide 2. Install the rear of the cylinder onto the two guide posts on the mainframe. 3. Slide the cylinder plate into the brewer mainframe (the flat side of cylinder plate must be up against the mainframe).
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Page 21: Replacing The T-Bar & Housing, Crank Arm, Triple Cam, And The Brewer Arms
Zuma Brewer - Operation & Service Guide 4. Insert the crank arm pin through the front of the piston rod and through the crank arm ( ). It may be necessary to raise or lower the piston in the cylinder to properly align the two. Secure it in place by ... - Page 22 Zuma Brewer - Operation & Service Guide 3. Remove the coupling pin at the back of the brewer. This pin is tapered and press-fit into the shaft - tap the longer end of the pin with a hammer until it pops out of the shaft ( ).
- Page 23 Zuma Brewer - Operation & Service Guide 6. Flip the brewer over (cylinder up) and pull the T-bar housing until the housing and the triple cam can be removed. It may be necessary to move the components back and forth to release them.
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Page 24: Re-Assembling The Brewer
Zuma Brewer - Operation & Service Guide 9. Pull the two arms and the large spring connected to the arms out through the bottom of the mainframe. NOTE: At this point in the procedure, the two arms can be completely removed. - Page 25 Zuma Brewer - Operation & Service Guide 2. Move the spring and arm assembly up against the front inner wall of the mainframe ( ) and insert the two arm pins through the rear of the mainframe and through the holes in each arm ( ).
- Page 26 Zuma Brewer - Operation & Service Guide 4. Insert the crank arm shaft through the opening in the front of the brewer, and through the triple cam and T-bar housing. Please note that the crank arm needs to properly couple with the triple cam.
- Page 27 Zuma Brewer - Operation & Service Guide 6. On the other side of the brewer, secure the crank arm to the brewer mainframe using the c-clip that was removed earlier in this procedure. 7. Insert the crank arm pin through the front of the piston rod and through the crank arm ( ).
- Page 28 T-bar into its recession on top of the H-frame. NOTE: You have now successfully re-assembled the Zuma brewer, however, the brewer will not function properly in its current state. You must now re-adjust the brewer chamber's tension. The procedure for adjusting the brewer tension is outlined on page 8.