Specifications

00218012 Revision B (KAK) 7 August, 2000
30
Multiplex Company, Inc.
Fountain Troubleshooting Guide
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 9: Water Booster System
Qualifier Probable Cause Corrective Action
Water Booster will not
cycle on. Both the
pressurized filter water
and filtered water pres-
sure register 55psi
(3.8bar).
Water Booster cycles
on and off and
pressurized Filtered
Water Gauged readings
range between 65psi
(4.6kg/cm
2
) to 85psi
(6.0kg/cm
2
).
Pump and Motor will not
cycle off.
No power to Water Booster
Pump.
Pressure Switch defective.
Motor defective.
Pump frozen.
Water supply shut-off after
Booster System.
Frozen Water Coil.
Water supply to Booster
Pump shut off.
Restricted Water Filter.
Leak on Booster System
Pump Strainer obstructed.
Pump Coupling Key defec-
tive.
Pump defective.
Pressure Switch improp-
erly adjusted or defective.
Verify Toggle Switch for Booster Pump is in
the on position and main power supply is
on.
Remove Pressure Switch Cover and use a volt-
meter across terminals to determine whether
open or closed. If in the open position,
replace Switch.
If Motor will not operate, verify voltage across
Motor Terminals with a voltmeter. If voltage
reads from 110 to 120 VAC, the Motor is defec-
tive and should be replaced.
Loosen the Coupling Clamp with a flat-blade
screwdriver and disengage pump from Motor.
Turn the Coupling key by hand, in back of pump.
If pump shaft will not spin freely, Pump is de-
fective and must be replaced.
Examine Shut-off Valve to Plain Water to Unit
and Water to Coffee Machine and insure both
are in the on position.
Refer to Troubleshooting Section 7: Refrigera-
tion System under No carbonated water at
any of the dispensing valves (freeze up).
Examine the Shut-off Valve to Booster Pump and
insure valve is in the on position.
Observe Filter Water Pressure Gauge. If pres-
sure drops total of 40psi (2.8bar) or more when
pump cycles on. Replace filter.
Locate water leaks on system and repair. Re-
move Pump Strainer at Brass Booster Pump,
flush screen with water to clean. Reassemble
and position in place. Replace screen if neces-
sary.
Using a flat-blade screwdriver, loosen Coupling
Clamp and disengage Pump from Motor. Exam-
ine Coupling Key, if rounded off on either end,
replace.
Examine Pressurized Filter Water Pressure
Gauge. If Pump and Motor continue to operate
but fail to build up to 85psi (6.0kg/cm
2
) in
order to cut off, pump is defective. Replace
Pump.
Observe Pressurized Filtered Water Pressure
Gauge to insure proper cycle on at 65psi
(4.6kg/cm
2
) and cycle off at 85psi
(6.0kg/cm
2
). Refer to instructions found un-
der Switch Cover for adjusting. If Switch does
not respond to adjustment, replace switch.
Low or no water pressure at noncarbonated beverages