8
5.7 Connecting to Syrup Supply
For installations requiring syrup lines less than 50 ft (15 m) in length, use tubing with a minimum ID of 3/8”. Run
the syrup lines from the pumps to the rear of the dispenser and connect to the proper syrup fitting (
Figure 5.1
).
For installations requiring syrup lines over 50 ft (15 m) in length, use tubing with a minimum ID of 1/2”. Using
tubing of any smaller diameter will lead to pressure fluctuations and false sold-out errors. Furthermore, con-
sider installing booster pumps on the supply lines. Increasing the regulated CO
2
pressure on the syrup pumps
can also help maintain proper supply pressure at the dispenser; however, be sure not to exceed the pressure
rating of the syrup pumps.
In all situations, it is recommended to install a shutoff valve near the connection to the back of the dispenser
to assist with servicing or removing the dispenser.
Do not turn on the CO
2
supply for the syrup pumps at this time.
5.8 Long Tubing Runs
Long runs of supply tubing can cause problems if the pressure drop (between the CO
2
tank or syrup source
and the dispenser) is too much. Runs longer than 25 feet (7.62 m) will require special attention. The machine’s
sensors may indicate that the machine is out of syrup, water, or CO
2
. Consider the following solutions:
1. Increase the tubing size from 3/8 inch diameter to 1/2 inch diameter.
2. Install booster pumps in the supply lines. Use a vacuum regulating valve with syrup booster pumps.
3. Increase primary CO
2
regulator pressure from bulk or tank CO
2
to 105 to 120 psig (724 to
827 kPag). An additional regulator may be necessary for pumps (syrup or water) to avoid exceeding
manufacturer’s recommended operating pressures.
