Operating Adjustments; Thermostat - H.C Duke & Son 959R Operator’s Manual With Illustrated Parts List

INSTALLATION AND SERVICE MANUAL 959R
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8

Operating Adjustments

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The freezer will need to be tested with mix for verification of proper control set-
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 tings. Follow the disassembly, cleaning and assembly instructions in the Operator's
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Manual. Once the freezer has been assembled and sanitized, prime the freezer
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with mix in accordance with the Operator's and Pump Manual instructions.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 The following adjustments are mandatory on installation. All adjustments must be
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within specifications to obtain proper operation of the freezer.
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Thermostat

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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 Figure 8-1 Thermostat
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20
1. Turn the selector switch to "AUT O"
and accurately note the time. The
soft serve freezer should produce a
servable product of 18°F (-8°C)and
40-45% overrun when it cycles off .
When adjusted properly the freezer
should cycle off for the first time in 5
to 8 minutes.
2. Check the cylinder thermostat s
located behind the lower front panel.
(See figure 8-1.) This control has two
settings visible through the window
on the cover. The setting marked
"DIFF" should be set at 5°F (20.6°C).
The setting marked "RANGE" should
be set at 25°F(-3.9°C).
The purpose of the cylinder thermo-
stat is to maintain an 18°F (-7.8°C)
product during idle periods. If the
thermostat is set too cold and prod-
uct is not drawn out of the machine,
a freeze-up or "popping" condition
will result. DO NOT run the product
dispensing temperature below 17°F
(-8.2°C).
NOTE: The settings on the ther-
mostat are ONLY to be used as a
guide and may not indicate actual
product temperature.
For a correct adjustment, a thermom-
eter must be used to check the
actual product temperature. The best
time to check product temperature is
after the third cycle with no draws
between them.
Set each thermostat for the product.
Most of the time, a temperature
setting of about 25° (-3.9°C) will
maintain a satisfactory product. Once
the thermostat is set it should require
no further adjustment. The normal
thermostat cycle should be approxi-
mately 1 minute run (or slightly
longer) and approximately 30 min-
utes off.
184981-02