Productshield; Figure 4−5 Range Lock Settings - Overlapping - Carrier VECTOR 6500 Operation & Service Manual

Range 1 is set for 325 to 425F
(05 to 5.65C)
Set for Continuous
5F
-22 -10
5C -30 -23.3

4.7.3 ProductShield

ProductShield is a group of Configurations that work to-
gether to allow improved operating efficiency while pro-
viding customized product protection.
Each ProductShield setting allows the user to select an
ambient temperature range in which to operate. The
Minimum and Maximum range values can be set to
OFF, or the allowed value range.
a. ProductShield: Econo
ProductShield Econo allows the microprocessor to
automatically switch from Start/Stop Operation to
Continuous Operation or vice versa. This allows
maximum product protection while providing for power
savings when ambient temperature is in the preset
range.
ProductShield Econo - Go to Start-Stop Operation.
When the unit is set to Continuous Operation,
ProductShield Econo allows the unit to run in Start/Stop
Operation when:
• The ProductShield Econo Configuration is set to GO
TO S/S AND
• The unit has run in Continuous Operation for a mini-
mum of either 15 minutes, or the Minimum Run Time
Functional Parameter setting (whichever time is lon-
ger) AND
• The ambient temperature falls within the pre-pro-
grammed temperature range AND
Range 1 always has priority
when Range 1 & 2 overlap
0 10 20
-17.8 -12.2 -6.7
Figure 4−5 Range Lock Settings - Overlapping
Range 2 is set for -225 to
89.65F (-305 to 325C)
Set for Start-Stop
Range 2
Range
1
30 40 50
-1.1 4.4 10.0
• The unit is not already running in ProductShield Win-
ter. (See Section c.)
The operator can also pre-program a maximum
evaporator coil
between the return air and supply air temperatures as
an additional criteria for switching to Start/Stop
Operation. The unit must bring the delta-t below this
setting before going to Start/Stop Operation if this option
is chosen.
In ProductShield Econo: Go to Start/Stop, the
delta-t must be lower than the value selected in
order to enter Start/Stop.
Once the microprocessor detects that the above criteria
have been met, the unit will switch from Continuous
Operation to a Start/Stop Off Cycle for the MINIMUM
OFF TIME Functional Parameter setting. During the
Minimum Off Time, the RESTART OVERRIDE
TEMPERATURE Functional Parameter setting can
cause the unit to restart to protect the load. After the
Minimum Off Time has expired the unit will return to
Continuous Operation once, or if, the return air tempera-
ture is more than the configured perishable restart tem-
perature away from setpoint in the perishable range, or
the configured frozen restart temperature above set
point in the frozen range.
When the unit restarts, it will return to Continuous
Operation for a minimum of 15 minutes or the Minimum
Run Time Functional Parameter setting, whichever time
is longer. The original activation conditions must then be
4−11
60 70 80
15.6 21.1 26.7
temperature differential
NOTE
(delta-t)
62-11389