Howe Rapid Freeze, Service Manual

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14 TroubleShooting Chart
48
PROBLEM PROBABLE CAUSE REMEDY
Head pressure controls defective.
Replace defective head
pressure control.
(Headmaster Control)
Condensing unit undersized. Replace unit with
properly sized condensing
unit.
Ice flakes too small and
too "powdery"
Evaporating temp. too low because
condensing unit is oversized.
Install EPR and adjust
evaporating temperature
between -5°F and -10°F.
(-30°F to -35° F for
seawater)
) Dull carbon steel ice blade. Replace ice blade with
stainless steel blade.
Operation with excessive
"chatter" may result in
damage to speed reducer,
motor, coupling and main
bearings. X Ice flaker "chatters"
excessively, does not run
smoothly.
Excessive ice blade clearance. Inspect and adjust ice
blade clearances. (see
section 11, service &
adjustment).
Worn main bearings and/or shaft. Replace bearings and/or
shaft (if worn) (see section
11, service & adjustment).
Too much ice accumulation
in bottom water collecting
trough.
Ice deflector not properly
positioned.
Reposition ice deflector.
(see section 11, service &
adjustment)
Ambient temperature too cold. Install cartridge heaters in
ribs, ** flaker must be
ambient temperatures
above 40°F. Too much ice accumulation
in bottom water collecting
trough and in water
sump, and excessive ice
build up on bottom 3
"ribs"
Water temperature too cold. Water temperature must
be above 40°F. Install
water mixing valve to
supply 60°F (ideally)
water to ice flaker.
Ice in storage bin too wet.
(Water dripping into bin
with ice).
Water level in sump set too high
(water overflows bottom
collecting trough)
Adjust water float valve to
maintain water level
3
"
below water return trough