Specifications

Multiplex Company, Inc.
Fountain Troubleshooting Guide
11
00218012 Revision B (KAK) 7 August, 2000
Troubleshooting Guide
WARNING: Inspection, testing, and repair of elec-
trical equipment should be performed only by
qualified service personnel. The unit should be
unplugged when servicing, except when electri-
cal tests are required.
DANGER: Use extreme care during electrical cir-
cuit tests. Live circuits may be exposed.
Section 2: Carbonated Water System (continued)
Qualifier Probable Cause Corrective Action
Little or no carbonated
water at dispensing
valve.
Primary CO2 Regulator ad-
justed at extremely high
pressure.
Water supply to Carbon-
ator Pump shut-off or re-
stricted.
Water Filter restricted.
Back Flow Preventer or
Double Check Valve.
Carbonator Pump worn.
Coupling Key defective.
Verify CO
2 Primary Regulators are set at 90 psi
(6.3 kg/cm
2
). Adjust if necessary. If regulator
will not star in adjustment, replace regulator.
Verify water to unit by observing Filtered Wa-
ter Pressure Gauge. It should register 55 psi
(3.9kg/cm
2
). Examine Water Shut-off Valves to
carbonator and insure they are in the on po-
sition. Examine Pump Strainer for restriction.
Clean if necessary.
Place Filter By-pass valve into the Filter By-
pass position. If carbonator pump and motor
immediately cycle off, Filter Cartridge is re-
stricted. Replace Cartridge.
Examine Filter Water Pressure Gauge. If it reg-
isters 90 psi (6.3 kg/cm
2
) CO2 gas is passing from
the carbonator tank and through the Back Flow
Preventer or Double Check Valve, preventing
water from entering pump. Clean or replace
Back Flow Preventer/Double Check Valve.
Remove top cover from Remote Refrigeration
Unit. Locate Toggle Relief Valve on Carbonator
Tank and lift lever to allow CO
2 gas to escape
from Tank for 30 seconds. If during this time
Carbonator Pump cycles off, pump is worn
and should be replaced.
Loosen the Coupling Clamp with a flat-blade
screwdriver and disengage Pump from Motor.
Examine Coupling Key in Pump. If defective,
replace.
Carbonator pump and motor will not cycle off (possibly noisy pump)