Manitowoc Welbilt Indigo NXT QuietQube, Manual

Page: 121 / 183

© Welbilt, Inc.
Symptom #3: Remote CVD
121
Indigo NXT Ice Machine Troubleshooting
Is your Harvest Valve(s)
Energized?
Note: All Pressure Readings are
taken from the Liquid and Suction
Shut Off Valves located in the rear
of the Ice Machine Head Section.
YES
Refer to Sequence of Operation
& Wiring Diagram
Are the Harvest
Pressures Normal?
Do you have High Head and Low
Suction Pressure in Harvest?
Refer to Harvest
Valve Analysis.
NO
NO
YES
YES
NO
Do you have Low Head Pressure and
Low Suction Pressure in Harvest?
Not a Refrigeration Problem
Inspect and Clean Evaporator
No Harvest PSI Normal
Feel Temperature of
Receiver 30 seconds into
Harvest Cycle
Feels Warm to Hot.
YES
Cold
Feel Temperature of Liquid Line
at rear of Head Section.
Backseat Liquid line Shut
Off Valve or replace.
Feel Temperature of Liquid Line
at Condensing Unit.
Look for Restriction,
Correct Line Set Size,
Proper insulation.
Does the Condenser Fan Motor run
below Cut Out Setpoint in Harvest?
Refer to Fan Cycling
Control Diagnostics.
Note: Some CVD675
Condensing Units may not
have a Fan Cycle Control
Cold
Feels Hot
Feels Hot
Cold
YES
NO
Feel Temperature of Discharge line
30 seconds into Harvest Cycle
(Refer to Harvest Headmaster Diagnostics.)
Refer to Symptom #2
Refrigeration Analysis
Chart
Weigh charge as you are recovering,
if incorrect evacuate and recharge,
if correct then proceed
Change Headmaster
Evacuate System, Recharge and
perform Production Check
Headmaster is in 100% Bypass
Headmaster is not in 100% Bypass
Refrigerant charge is correct
Refrigerant Charge is Incorrect
Is the ice machine
installed correctly?
Correct the
Installation
NO
YES
Condensing Unit
Ice Machine Head Section
Condenser
HPCV
Accumulator
Suction
Filter
LLSV
Drier
TXV
Evaporator
Comp.
Suction Line
‘S’ Trap
Rises Over 20’
Shut-Off Valves
Harvest Valve
Check Valve
Receiver Service Valve
Receiver
T1
T2
T3
T4