Servend MD 150, Installation & Service Manual

Page: 25 / 64

Installation and Service Manual
25
OPERATION
BACK ROOM PACKAGE
BAG-IN-BOX SYSTEM
Creating Carbonated Water:
1. Incoming tap water - should be at a minimum dy-
namic pressure of 40 psi and maximum static pres-
sure of 55 psi.
2. Carbonator Water pump motor - Powers the wa-
ter pump. The water pump motor is part of the car-
bonator pump deck.
3. Carbonator Water pump - Pumps tap water into
the carbonator tank. The water pump is part of the
carbonator. The incoming water for the carbonator
must be first ran through the pump before connect-
ing to the proper cold plate inlet.
4. Internal/External Carbonator tank - Combines
CO
2
gas and tap water to form carbonated water.
The “carbonator” is the carbonator tank, water pump
and water pump motor.
On an ambient system, after being carbonated, the car-
bonated water is fed from the carbonator to the dispenser
cold plate for chilling. At the beverage valve, chilled water
and chilled syrup are mixed to create the finished bever-
age. A cold carbonated system pre-chills the water be-
fore entering the carbonator tank.
Pumping Syrup to the Dispenser:
5. CO
2
cylinder - Holds highly pressurized carbon di-
oxide (CO
2
). The CO
2
cylinder is a steel or alumi-
num cylinder tank. CO
2
gas flows to the primary
pressure regulator.
6. Cylinder pressure gauge - Indicates amount of
CO
2
gas in the cylinder.
7. Primary pressure regulator - Lowers the CO
2
gas
pressure, to 100 psi, so the CO
2
gas will be at the
proper pressure to enter the carbonator regulator.
8. Lowered outgoing pressure - Set for 75 psi.
Gauge indicated lowered outgoing pressure from
the CO
2
cylinder after being routed through the pri-
mary pressure regulator at 100 psi..
9. Secondary pressure regulator - Lowers the CO
2
gas pressure before the CO
2
gas flows to the syrup
pump. CO
2
pressure, 60 to 75 PSI, activates the
syrup pump.
10. Syrup pump - Draws syrup out of the bag-in-box
syrup package. Syrup flows through the syrup lines
to the dispenser for chilling, then dispensing. There
is a syrup pump for each bag-in-box syrup system.
11. Bag-In-Box syrup cartons - Box which contains a
plastic bag, filled with syrup.