FBD 37 Series Installation & Operation Manual page 54

A5.6 Connecting to N2 Supply
The Nitrofub dispenser will require a connection to CO2 as stated in Section 5.6; however, that CO2 supply will only be used
for operating the pumps. The Nitrofub dispenser will also need to be connected to an N2 supply to be used for the Nitro-
FCB barrel. That 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 "N2" (Figure A5.1) using a 1/4" flare fitting. This regulator should only support N2 to the frozen beverage
dispenser. Installing a shutoff valve near the connection will be helpful when removing the dispenser.
A6. STARTING UP THE DISPENSER
A6.1 Leak Check and Prime
Follow the same procedure listed in Section 6.1 with the change on the step below.
Turn on the water, CO2, and N2 supplies. Ensure both are flowing to the dispenser.
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Note: The water and syrup pumps will activate loudly until the lines are pressurized.
A6.2 Initial Power Up
Follow the same procedure listed in Section 6.2 with the change on the step below.
Verify the regulated N2 pressure is approximately 60 PSIG (414 kPag) and adjust the regulator if
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needed.
The dispenser will tolerate fluctuations in regulated N2 from 50 to 70 PSIG (345 to 483 kPag) because it will automatically compensate. It is best
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to ensure during setup that it is as close to 60 PSIG (414 kPag) as possible.
A6.4 Filling Barrel and Starting
Follow the same procedure listed in Section 6.4. The Nitrofub dispenser will purge the barrel with N2 instead of CO2.
A7. DISPENSER OPERATION
A7.4 Drink Quality
The drink quality factors are the same as listed in Section 7.4; however, for the Nitrofub dispenser, the EXPANSION
ADJUSTMENT controls how much N2 is injected into the product instead of CO2.
A7.7 Drink Too Heavy
A drink from the Nitrofub dispenser with not enough N2 will behave in the same manner as one with CO2, and its N2 content
can be increased in the same manner as explained in Section 7.7.
A7.8 Drink Too Light
A drink from the Nitrofub dispenser with too much N2 will behave in the same manner as one with CO2, and its N2 content
can be reduced in the same manner as explained in Section 7.8.
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37X INSTALLATION & OPERATION MANUAL
372/373 MODEL
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