Calibration; How To Calibrate The Flow Rate - Fetco CBS-2251 Users Manual And Operator Instructions

Program Items

Calibration

Flow Rates
Brew left
Water Valves
Flow Rates
Brew right
Water Valves
Flow Rates
Bypass left
Water Valves
Flow Rates
Bypass right
Water Valves
Flow Rates For automatic hot
Faucet Valve water faucet
Slow Flow
Fill Compensation
Compensation
LLC
Set the flow rates of the brewer valves to adjust for over or under potting.
Built-in algorithms in brewer controller software corrects brew parameter to customer preferences or to trim variations in flow control components
The control software uses the new flow rate entered in the CALIBRATION screen to adjust and correct the amount of water delivered by the valve
Increasing the flow rate value DECREASES the volume of water dispensed
Decreasing the flow rate value INCREASES the volume of water dispensed
-Obtain the VOLUME DISPENSED of water only, by brewing a batch without coffee or filter paper.
Flow rate adjustment will control all batches made by the valve. All batches on the side of the valve will be adjusted, (left or right)
-Obtain the PROGAMMED VALUE of the same brew. This is displayed on the home screen in the batch box
-Obtain the CURRENT SETTING for the flow rate from the brewer. Do this by entering PROGRAMMING and
Tap to "CALIBRATION" then, tap "Flow Rates" and then "Water Valves". The valves flow rate is in the top right corner.
Using the values obtained above to obtain the new flow rate setting to correct the volume dispensed:
VOLUME DISPENSED
Divide the volume dispensed by the programmed volume and then multiply by the current setting
PROGRAMMED VALUE
-Enter programming mode, tap to "CALIBRATION"
-Tap back to "Flow Rates" and then to "Water Valves"
-Enter the new flow rate into the calibration slider for the valve tested
Note: values for brewers set in gallons are in decimal format. Place all quantities in ounces and divide by 128 (One gallon =128 ounces)
to obtain decimal format  1 ½ gallon=128oz+64oz=192 oz (in 1 ½ gal.) 192÷128=1.5 gal
Example below shows overpotting of 16oz over 11/2 gal. batch corrected by recalibration using the formula above
Obtain Volume Dispensed
Example:
A CBS-2252 delivered 16 ounces
over the 1½ gallon (192oz) setting
for Batch 1-Left Side
192oz+16oz=208oz
208oz÷128oz/gallon=1.63gallon
By entering the new flow rate number into the brewer, the software automatically corrects the volume discrepancy
Go to fetco.com for the latest versions of all information
Factory set
Programming Range
Default
Brew Left
3000
3000 ml/min
0.79
Brew Right
3000
3000 ml/min
0.79
Bypass Left
1150
1900 ml/min
0.30
Bypass Right
1150
1900 ml/min
0.30
Faucet
1
4 ml/min
Scroll and go to EXIT&SAVE
Off
o .. 1.5x
OFF
o 2.5x
Scroll and go to EXIT&SAVE
Normal
NORMAL
o .. High
Scroll and go to EXIT&SAVE

How to calibrate the flow rate

×CURRENT SETTING=NEW FLOW RATE SETTING
Obtain Programmed Value Obtain Current Setting
The Programmed value The valves flow rate is in the
for batch 1 -left side of top right corner
the CBS-2252 is on the Brew Left
home screen in the
0.79
batch box.
The value is 0.93
The value is 1.5 gallon
Page 11
/
0.93 3550
(Gal.) (ml)
ml/min 4150
Use to attenuate and compensate for
variations in brew valve output
gal/min 1.09
-----------------
/
0.93 3550
(Gal.) (ml)
ml/min 4150
Use to attenuate and compensate for
variations in brew valve output
gal/min 1.09
-----------------
/
0.36 1350
(Gal.) (ml)
ml/min 1700
Use to attenuate and compensate for
variations in bypass valve output
gal/min 0.44
-----------------
/
0.36 1350
(Gal.) (ml)
ml/min 1700
Use to attenuate and compensate for
variations in bypass valve output
gal/min 0.44
-----------------
4
To compensate variations in timed
ml/min 10
dispense from automatic hot water
----------------
faucet
Use for FloJet bottled water supply or
for reduced water supply from mains.
Liquid level control sensitivity.
Normal for most water.
High is for reverse osmosis water or
very pure water.
.
Use the formula above
1.65
× 0.93 = ����. ��������
1.5
0.93
(Gal.)
gal/min 1.09
---------------
The new flow rate is
1.02
Notes
Enter the New Flow Rate
Brew Left
1.02
(Gal.)
0.79 gal/min 1.09
-
Enter new setting on the slider
as shown and EXIT to save.
Retesting recommended
P195 January 2023