37X INSTALLATION & OPERATION MANUAL
372/373 MODEL
8
5.6 Connecting to CO2 Supply
NF*
The CO2 supply may come from either an independent tank with a primary/secondary regulator or a bulk tank that supplies
other equipment. If the supply is from a bulk tank, supply pressure must not exceed 120 PSIG (827 kPag). Tee off the
main line and install a wall-mounted secondary regulator set to 70 PSIG (483 kPag). Fabricate a 3/8” ID line from the
secondary regulator (independent tank or wall mount) to the rear of the dispenser and connect to the bulkhead fitting
labeled “CO2” (
Figures 5.1
and
5.2
) using a 1/4” flare fitting. This regulator should only supply CO2 to the frozen beverage
dispenser. Installing a shutoff valve near the connection will be helpful when removing the dispenser.
If the dispenser is on a base cart with the BIBs and syrup pumps inside then install a tee in the supply CO2 line to feed the
syrup pumps.
Do not turn on the CO2 supply at this time.
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 (
Figures 5.1
and
5.2
).
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, consider installing booster
pumps on the supply lines. Increasing the regulated CO2 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 CO2 supply for the syrup pumps at this time.
*Refer to Appendices for additional information on Nitrofub configuration.
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