Installing ShureShot Timers on a v3 Slayer

Installing ShureShot Timers on a v3 Slayer is probably one of our most time consuming installs, but the result is an install fully integrated with the original Slayer Control system and running on 24VDC


The key differences to our regular Shure Shot System are;

ShureShots Powered by 24VDC

Outputs to Solenoid Valves and Pump Relays are 24VDC (pulled LOW to activate*)

Our High Current carrying capacity MOSFET switches replace *almost* all relays in the Slayer.

Step 1 • Dissassembly 

Identify all connectors and mark or tape


  • These Should be;
  • Switch1: Black/White*
  • Pump Switch: Black/White
  • Switch2: Black/Green
  • Original Preinfusion Switch: Purple/Purple (opposing gender)
  • Brew Valve: Black/Yellow
  • Needle (bypass) Valve: Black/Blue
  • RTD: Red/White (usually) 

Labelling Switch Connectors

Removal of bottom electrical tray


  • Remove drip tray assembly
  • Remove 6 x #8-32 screws from middle electrical panel
  • Disconnect all Molex electrical connectors - marking as necessary
  • Take middle tray to large, clean workspace.
  • Put the coffee on! It's going to be a long night!

Step 2 - Identify & Remove Relays

Identify all wiring to the relays and mark terminals with a code or tape. This should be fairly straight forward - as the colours are now fairly consistent on the v3 Slayers. You should find;


  • White wire going to the coil of the relay which drives the Brew Valve Relay
  • Green wire going to the coil of the relay which drives the Needle Bypass Valve Relay
  • An additional white wire from the second "Switch 1" - this is the original pump signal and these will all be grouped together (2 for a 2-Group, 3 for a 3-Group) and will terminate at the pump relay. This signal is no longer required for the ShureShot (we only need 2 switches).
  • Yellow wire going to the relay which drives the Brew Valve Relay
  • Blue wire going to the relay which drives the Needle Bypass Valve Relay


take a note of the position of the relays. These *should be fairly consistent now on the v3 machines as follows;


drawing of v3 components to go here


Remove the Pump relay, brew valve relays and all needle bypass relays

v3 Slayer Control Board with all relays removed - except Pump and Hot Water

Step 3 - Mount v3 Driver Boards

Step 4 - Wire in Driver Boards

Referring to top 6-Pin Connector, for each group's driver board;


Connect 24VDC Ground from the Slayer Power Supply (Black) to Terminal 1

Connect 24VDC Positive from the Slayer Power Supply (Red) to Terminal 2

Connect the Yellow Wire going to the Brew Valve to Terminal 3

Connect the White Wire going to the (new) common Pump Relay to Terminal 4

Connect the Blue Wire going to the Needle/Bypass Valve to Terminal 5

Terminal 6 is not used in most applications


Referring to the bottom 4-Pin Terminal Block, for each driver board;


Connect 24VDC Ground from the Slayer Power Supply (Black) to Terminal 1 (can join to top terminal 1)

Connect the White Wire from Switch 1 to Terminal 2

Connect the Green Wire from Switch 2 to Terminal 3

Connect the Purple Wire from the Manual Flush Switch 1 to Terminal 4


Step 5 - Modifying 'common' Lines in Loom

Making separation of Switches Common and Valve Common
Common (black) wires for Valves need to be removed from Ground and connected to +24VDC