Welbilt FB081TF, Service Manual

Page: 36 / 96

36 Part Number REV00 04/08/2020
Troubleshooting Section 5
WATER SYSTEM CHECKLIST
A water-related problem could cause component
misdiagnoses. Water system problems must be identified
and eliminated prior to replacing other components.
Possible Problem List Corrective Action List
Water supply pressure not
between 40 and 80 psig.
Check water supply pressure &
regulator Settings.
Water regulator(s) on the unit
must be set to 35psig dynamic.
Check regulator setting and
adjust to 35 psig pressure.
Incoming water temperature
is not between 45°F (1.7°C)
and 90°F(4 C/ 32.2°C)
If too hot, check the hot water
line check valves in other store
equipment.
Water filtration is plugged
(if used)
Install a new water filter.
Hoses, fittings, etc., are leaking
water.
Repair/replace as needed.
Water float valve is stuck
open or closed.
Clean/replace as needed.
Ice Chute safety switch
stuck open or closed
Clean/replace if needed.
Water probes in header tank
are not detecting water.
Short probes to check. Clean
probes.
Water probes in header tank
are not detecting water.
Short probe cable out at board
connection. Replace cable if
needed.
Was Zone 3 or 4 Ice Maker
Cleaning
just performed?
Allow time for restart and ice
production, check for frozen
evaporator..
REFRIGERATION SYSTEM CHECKLIST
Installation/visual inspection checklist
Inadequate Clearances Check all clearances on sides,
back and top
Condenser is dirty Clean the condenser
Inadequate Water supply
Refer to water system checklist
Ice machine is dirty Clean ice machine - excessive
operational noise will normally
be corrected with cleaning.
Infrequent cleaning may need
an overnight soak with ice
machine cleaner to remove all
lime/scale deposits.
ICE PRODUCTION & QUALITY CHECK
Ice Production
1. Empty the ice from the unit by starting Zone 3 cleaning
which dumps ice for 4 minutes.
2. Remove the ice bin lid, remove the ice dispense drive
shaft / agitator.
3. Run the ice machine a minimum of 10 minutes to allow
the system to stabilize.
4. Measure the air temperature entering the condenser
and the water temperature entering the unit (with
insulated probe).
5. Weigh a dry, non-perforated container that will fit in
the ice bin to catch the ice.
6. Catch the ice in container for 7 minutes and 12 seconds
(approximately 1 kg) or, for more accuracy, 14 minutes
and 24 seconds (approx. 2 kg).
7. Weigh the container and ice, and then deduct the
weight of the container.
8. Determine the 24-hour ice production capacity.
• 7 minutes 12 seconds: Multiply the total ice
weight by 200.
• 14 minutes 24 seconds: Multiply the total ice
weight by 100.
Quality
Ice production will vary with ambient and water
temperatures.
Higher incoming water temperature results in lower ice
production quantity.
Lower water temperature results in higher ice quantity.
EXAMPLE:
1. Collected ice for 7 minutes 12 seconds.
2. Total weight (minus container) = 0.95 kg.
3. 0.95 kg. x 200 = 190 kg of ice every 24 hours.
4. Compare the capacity to the 24-hour ice production
chart for the conditions being tested.
5. Ice production checks that are within 10% of the
charted capacity are considered normal due to
variances. Actual temperatures will seldom match
the chart exactly. Please See “24-Hour Ice Production/
Refrigerant Pressure Charts” on page 85 for charts on
acceptable ice production.