Multiplex SII-021 Service Manual

Subject: T o T ee or Not to Tee?

Figure 1

SII-021

8/09

Parts & Service Communicator

SCOPE

Do not put a tee for the plain water connection in the line from the
pump deck to the cold plate when installing cold carbonated (Intelli
Carb) equipment.

By putting a tee in the line will create service problems and bad
drink quality . What can happen is whe n dispensing a
noncarbonated beverage and a carbonated beverag e at the same
time, the CO2 inside the carbonator tank overpowers the water
coming in, starving the carbonated drink for water. Then you can
have a gas out condition in the carbonated tank. Another pro blem
that can occur is a water hammer condition. This is when you ha ve
excessive pressure building up in the water lines. In the carbonated
lines, the carbonation tank provides a shock absor ber for the wate r
pressures in the line. This shock absorber is not there for the non
carbonated drinks. When a non carbonated drink is poured, it will
come out very fast immediately after the pump has run. As the
drink pours, the pressure decreases and so does the volume of
water to the drink. Then bad drink quality will surface though
irregular ratioing (brixing) of the valves. The hammering can
damage valve O-rings and can possibly cause leaks.

Additionally make sure the total water supply tubing is sufficiently
sized (minimum 3/8") to handle the drink capacity of the dispenser.
The dynamic (flowing) water pressure measured just before the
pump inlet with the pump running can go no lower than 40 P.S.I.
This translates into filling a five gallon bucket with water in two
minutes and 24 seconds or less with the water line going to the
pump.

ACTION

When installing or servicing make sure that the water line from
the pump deck to the water inlet on the cold plate has no tees
or branches coming off it.

FURTHER ACTIONS

Contact Manitowoc Beverage Systems Service Sellersburg
Indiana if you have any questions or concerns: 800-367-0427.

Manitowoc Beverage Systems Sellersburg, 2100 Future Drive, Sellersburg, IN 47172, Tel: [phone], www.manitowocbeverage.com