Cornelius Quest NT 4000 Service Manual page 14

Quest Service Manual
PROBLEM
No water dis-
pensed, concen-
trate only
(continued)
No water and no
concentrate,
refrigeration is
working
No concentrate
dispensed, water
only
Publication Number: 720901117SER
PROBABLE CAUSE
• Water solenoid located on pump
platform clogged or defective
• Main water solenoid/strainer
located at the rear of dispenser is
clogged, binding or defective
• Water supply pressure is
greater than 80 psi (5.5 bar) forc-
ing the brix flow control closed
• Freeze-up of water coil in ice
bath
•
• Black service switch located on
the rear of the cabinet door in OFF
position
• White door switch open
• 6.25 amp fuse inside front elec-
trical box blown
• No output from Transformer
• Defective voltage regulator
board (VRB) located inside front
electrical box
• Defective dispense push button
or portion control board
• Concentrate container not fully
engaged into receptacle on pump
platform
• Dispense/Flush lever in FLUSH
position
• Concentrate too cold, not properly
thawed
- 10 -
REMEDY
• Disassemble and clean sole-
noid. Replace if necessary.
• Remove and clean strainer.
Confirm 28VDC is present at sole-
noid during dispense. Confirm
solenoid coil is not open. Disas-
semble and clean solenoid.
• Add external regulator and
lower pressure to 50 psi (3.5 bar)
• Unplug dispenser and allow 2-4
hours to thaw. Check operation of
agitator motor and ice bank con-
trol.
• Refrigeration system may be
low on charge resulting in a
deformed ice bank and freeze-up
of the water coil in the ice bath.
• Turn on switch
• Door switch must be closed in
order to dispense. Check switch
operation and replace if neces-
sary.
• Replace with 6.25, 250VAC
slow blow fuse and test
• Confirm transformer output by of
26VAC +/- 2. Replace transformer
if necessary.
• Measure across the VDC output
of the board. There should be
28VDC present when the dispense
button is pressed. Replaced VRB if
necessary.
• Test and replace if necessary
• Refer to Concentrate Loading
section of this manual
• Move lever to DISPENSE posi-
tion
• Concentrate should be 35-40°F
(1.7-4.5°C) prior to loading
© 2004, IMI Cornelius Inc.