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met in order for the unit to return to ProductShield
Econo: Start/Stop.
ProductShield Econo: Go To Start/Stop Examples:
The following examples apply in situations where all
other Start/Stop conditions have been met.
Example 1 If the Minimum is set to 30°F (-1.1°C) and
the Maximum is set to 40°F (4.4°C) and the ambient air
temperature falls between these temperatures, the unit
operation can change to Econo Start/Stop.
Example 2 If the Minimum is set to 30°F (-1.1°C) and
the Maximum is set to OFF and the ambient air
temperature is above 30°F (-1.1°C), the unit operation
can change to Econo Start/Stop.
Example 3
If the Minimum is set to OFF and the
Maximum is set to 40°F (4.4°C) and the ambient air
temperature falls below 40°F (1.7°C), the unit operation
can change to Econo Start/Stop.
Example 4 If both the Min and the Max are set to OFF,
unit operation can change to Econo Start/Stop at any
ambient temperature.
ProductShield
Econo
Operation.
When the unit is set for Start/Stop, ProductShield Econo
allows the unit to run in Continuous Operation when:
• ProductShield Econo configuration is set to GO TO
CONTINUOUS AND
• The unit has run in Start/Stop Operation for a minim-
um of 15 minutes OR the Minimum Run Time, Func-
tional Parameter setting (whichever time is longer)
AND
• The ambient temperature falls outside the pre-pro-
grammed temperature range AND
• The unit is not already running in ProductShield Win-
ter. (See Section c.)
Once the microprocessor detects that the above criteria
have been met, the unit will switch from Start/Stop to
Continuous Operation for a minimum of 30 minutes.
After 30 minutes the unit will return to Start/Stop if the
ambient temperature enters the pre-programmed
temperature range.
NOTE
Delta-t logic is not used or available when Pro-
ductShield Econo - Go To Continuous is active.
ProductShield
Econo:
Examples
Example 1 If the Minimum is set to 0°F (-17.8°C) and
the Maximum is set to 90°F (32.2°C) and the ambient air
temperature falls outside these temperatures, the unit
operation can change to Econo Continuous Operation.
Example 2 If the Minimum is set to 0°F (-17.8°C) and
the Maximum is set to OFF and the ambient air
temperature falls below 0°F (-17.8°C), the unit
operation can change to Econo Continuous Operation.
Example 3 If the Minimum is set to OFF and the
Maximum is set to 90°F (32.2°C) and the ambient air
temperature falls above 90°F (32.2°C), the unit
operation can change to Econo Continuous Operation.
62-11389
-
Go
to
Continuous
Go
To
Continuous
Example 4 If both the Minimum and Maximum are set
to OFF, ProductShield Econo: Go To Continuous can
not operate as there is no range for the ambient to fall
outside of.
b. ProductShield: High Air
ProductShield High Air allows the microprocessor to
automatically switch the engine from normal to forced
high speed, and thereby provide high evaporator air
flow. This allows maximum product protection when
certain conditions are met while providing for power
savings when High Air is not required.
Operation
in
High
Configurations; ProductShield High Air, High air
Minimum Temperature, High Air Maximum Temperature
and High Air Delta-T.
•
The Product Shield High Air Configuration may be
set to OFF or ON. ProductShield High Air is only active
when the Configuration is set to ON.
•
The High Air ambient air temperature range is
defined by the High Air Maximum Temperature
Configuration setting and the High Air Minimum
Temperature Configuration setting. When a value is
entered for both of these configurations, the unit will
enter High Air when ambient temperature is above the
high setting or below the low setting.
•
When the High Air Maximum Temperature
Configuration is set for a value and High Air Minimum
Temperature Configuration is set to OFF, the
microprocessor will switch to high speed operation
when the ambient temperature is above the setting.
•
When
the
High
Configuration is set for a value and High Air Maximum
Temperature Configuration is set to OFF, the
microprocessor will switch to high speed operation
when the ambient temperature is below the setting.
•
When both the High Air Minimum Temperature
Configuration and the High Air Maximum Temperature
Configuration are set to OFF, ProductShield is not
active.
•
If a value is entered in the High Air Delta-T
Configuration, the delta-t must be above the value
before the microprocessor may switch to High Speed
Once
the
microprocessor
pre-programmed criteria have been met, the unit will
switch to High Air. The unit will continue to operate in
High Air for a minimum of 30 minutes. After 30 minutes
the unit will return to normal operation if the ambient
temperature
falls
temperature range by ±3.6° F ( ±2° C).
If the unit shuts down in Auto Start/Stop during High Air,
it will not be in High Air when it restarts and will return to
normal operation for a minimum of 15 minutes. The
original activation conditions must then be met in order
for the unit to return to high air.
4−12
Air
is
controlled
by
Air
Minimum Temperature
determines
that
inside
the
pre-programmed
four
the
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