Specifications

Part Number STH12 9/10 101
CO
2
Gas System
On units not equipped with Air Pump, check all
Probable Causes listed below.
Qualifier
Probable
Cause
Corrective Action
Loss of CO
2
If leak occurs while
Change-over valve
is positioned on Air,
follow the “Probable
Causes” (for units
equipped with Air
Pump).
CO
2
Tank
leaking.
Use a soap solution around CO
2
Tank
valve Stem to locate leaks. If leaks are
present, bubbles will appear. If valve
Stem leaks at Tank, replace CO
2
Tank.
CO
2
Washer
damaged or
missing.
Use a soap solution around Primary
Regulator Coupling Nut and CO
2
Tank
Stem. If bubbles appear, remove
Regulator and replace CO
2
Washer
found inside Nut. Secure Regulator to
Tank and check for leaks.
Primary
Regulator
Diaphragm
leaking.
Use a soap solution around Primary
Regulator Adjustment Screw in
Bonnet. If bubbles appear, diaphragm
is leading. Replace Primary Regulator.
Ruptured Line
Assembly or
leaks at
connections.
Use a soap solution around all
connections. If bubbles appear,
tighten loose connections carefully.
A to B
Change-over
Valve leaking.
Use a soap solution around A and B
CO
2
Tank Change-over Valve, tighten
if bubbles appear at Connections to
stop leaks.
CO
2
Low
Pressure Switch
leaking.
Use a soap solution around Low
Pressure CO
2
Switch. If bubbles
appear at pipe, tighten Connection. If
bubbles appear at Terminal end of
Switch - replace Switch.
CO
2
Check
valve leaking.
Use a soap solution around Check
valve. If bubbles appear, tighten
Connection to stop leaks.
Back Flow
Preventer stuck
open.
Use a soap solution around Back Flow
Preventer. Tighten if bubbles appear
at connection. If bubbles appear at
Vent Hole on underside of Back Flow
Preventer, clean out or replace Back
Flow Preventer valve and
corresponding Water Check valve.
Carbonator
Tank Relief
valve leaking.
Use a soap solution around Relief
valve. If bubbles appear, replace
Relief valve.
If leak occurs only
while Change-over
valve is positioned
on CO
2
, refer to
Troubleshooting
“Syrup System”.
Gas leak at the
syrup system.
Refer to Troubleshooting “Syrup
System” under No syrup or
insufficient syrup in finished drink.