Howe Corporation-Service Department 773-235-0200 [email protected]
1
QUALITY REFRIGERATION EQUIPMENT SINCE 1912
Large Capacity Flaker (
Seawater
)
Start & Adjust “Quick Step Guide”
The following is a “Quick Step Guide” to expedite four (4)
critical adjustments
of the new Howe Ice Flaker. The
adjustments
always
need to be done at time of startup. When done properly, these adjustments will insure proper
operation of this equipment and minimize costly call backs and optimize equipment up-time.
Evaporator Pressure Regulator Adjustment
Suction temperature should be adjusted with use of an Evaporator Pressure Regulator (EPR).
Models 51 - 101 Howe Flakers have an optimum suction temperature setting of -30°F. This optimum suction
temperature setting is to be checked and maintained at the flaker evaporator suction connection. They can
vary slightly due to the effects of water temperatures, water hardness, ambient air temperatures and ice quality
requirements.
Thermal Expansion Valve Adjustment
Howe Flake Ice Equipment’s Thermal Expansion Valve (TXV) must be adjusted visually (by sight) to assure
optimum
ice quality and ice harvesting.
Superheat settings are not a reliable method of adjusting
TXV on Howe Flaker.
Please note how ice appears in photo above for a properly adjusted TXV. An
even layer of ice should form completely from top to bottom on the evaporator. If ice on the lower 1”
to 4” of the evaporator looks different than the ice above it, this normally indicates the TXV is
underfeeding and requires opening.
Failure to make proper TXV adjustments may cause
unwanted ice build-ups on the evaporator. Ice build-ups can lead to the destruction of critical
components as well as the ice flaker if left operating incorrectly.
Models 76 and 101 ice flakers have two (2) TXV’s.
If underfeeding condition referenced in the
paragraph above exists on these “double circuit model units”, it is necessary to use two (2)
separate refrigeration gauges to balance the TXV’s at the same identical pressure setting
.
When one circuit appears to be underfeeding more than the other, it is necessary to open the TXV for
Refrigerant
Model #
Pressure Setting
Temperature Setting
R-407A
51-101
3.3 psig
-30°F
R-448A
51-101
4.2 psig
-30°F
R-449A
51-101
4.4 psig
-30°F
