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4.8
USER SELECTED OVERRIDE OPERATION
Three optional software override programs are available to the user. These programs include: Supply Air Limit Con-
trol, Temperature Range Lock and Product Shield. Information on how the unit operates under these programs is pro-
vided in the following sub-paragraphs.
4.8.1
Supply Air Limit Control
Supply Air Limit Control is available when the setpoint is at or between 32 to 65°F (0 to 18.4°C) and the unit is
operating in cool.
Supply Air Limit is NOT a positive temperature control, drift above and below the Supply Air Limit will be seen as
the system balances out.
Supply Air Temperature control will be accomplished by varying the position of the CSMV.
Supply Air Limit Configuration values can be set to allow for a different limit for Start-Stop than used in Continuous
Run.
Supply Air Limit Control is set using the PERISHABLE SENSITIVE PRODUCT Functional Parameter (which can be
set to OFF or ON), and the SUPPLY AIR LIMIT FOR START-STOP Operation Configuration or SUPPLY AIR LIMIT
FOR CONTINUOUS Operation Configuration (each of which can be set from 0 to -21.6°F [0 to -12°C]).
NOTE
These values are all negative (except for 0), therefore, when the value is added to the setpoint, the
result will be a temperature that is less than the setpoint.
When the PERISHABLE SENSITIVE PRODUCT Functional Parameter is set to OFF, the supply air temperature
will be the coldest temperature of 32°F (0°C) OR the calculated value of Setpoint minus the configured Supply Air
Limit value.
When the PERISHABLE SENSITIVE PRODUCT Functional Parameter is set to ON, the supply air temperature will
be the calculated value of setpoint minus the configured Supply Air Limit value.
Supply Air Limit controls the temperature of the supply air as it leaves the evaporator so that it does not go colder than
the configured Supply Air Limit value below setpoint.
NOTE
The 9°F value used in the following examples is not necessarily a recommend setting, but is only used
to show how the Supply Air Temperature Limit is calculated.
EXAMPLE 1: Perishable Sensitive Product Functional Parameter = OFF
Supply Air coldest temperature limit is the colder temperature of:
+32°F
OR
Setpoint minus configuration value for Supply Air Limit
Sample Calculations:
Setpoint
50°F
45°F
40°F
33°F
Supply Air Limit Configuration Value
-9°F
-9°F
-9°F
-9°F
Setpoint minus Supply Air Limit
41°F
36°F
31°F
24°F
Coldest Supply Air Temperature allowed
32°F
32°F
31°F
24°F
EXAMPLE 2: Perish Sensitive Product Functional Parameter = ON
Supply Air will be limited to setpoint minus configuration value for Supply Air Limit.
Sample Calculations:
Setpoint
50°F
40°F
33°F
Supply Air Limit Configuration Value
-9°F
-9°F
-9°F
Setpoint minus Supply Air Limit
41°F
31°F
24°F
Coldest Supply Air Temperature allowed
41°F
31°F
24°F
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