Component Functions; Tap Handles; Coffee Concentrate Pump - Cornelius Nitropro Mini Service And Preventative Maintenance Manual

Nitropro Mini Service Manual
3.3 C F
OMPONENT UNCTIONS

3.3.1 Tap Handles

The dispensing tap handles (Fig.3‐5), when pulled, activate
microswitches (Fig. 3‐6) that signal the Main PCB to activate
specific components, as de‐scribed previously in section 3.2.
Figure 3‐5 ‐ Tap Handles / Microswitch Assemblies
Figure 3‐6 ‐ Microswitch Assembly

3.3.2 Coffee Concentrate Pump

This pump (Fig.3‐7) draws coffee concentrate from the
chilled Bag In Box (BIB) and meters it to the mixing manifold
at a specific, user‐selected ratio to the input water (which is
supplied at a fixed pressure and flow rate).
Mixing ratios are adjusted by changing the DIP switch set‐
tings on the Main PCB mounted beneath the cabinet, as
shown in Figure 3‐8. Adjustment of these settings changes
the speed of the peristaltic pump to provide more or less
concentrate per unit time.
Publication Number: 548000106SER
Figure 3‐7 ‐ Concentrate Pump
Figure 3‐8 ‐ Ratio Select Switch & Tuning Buttons
The selectable ratios provide, from one gallon of concen‐
trate, the coffee yields shown in Table
3‐1. (NOTE: Select one ratio ‐ one switch ON.)
Table 3‐1 ‐ Concentrate Pump Ratios
Main PCB
Ratio
Switch Setting
3:1 Switch 1 ON
4:1 Switch 2 ON
5:1 Switch 3 ON
7:1 Switch 4 ON
Ratio Tuning Buttons: One press of a button changes the
pump motor speed by 5 RPMs (or by 0.02 ‐ 0.08 of the aver‐
age TDS value).
The peristaltic pump is driven by a 24V DC servo motor. A
maintenance kit for the pump includes a replacement pump
hose with nipple ends.
‐ 10 ‐
Concentrate Coffee Yield
Gallons Gallons
1 4
1 5
1 6
1 8
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