Figure 4--3 Controller Operation - Perishable Mode; Figure 4--4 Controller Operation - Frozen Mode - Carrier 69NT40-551-500 Operation And Service

PULL DOWN
START UNLOADED,
TRANSITION TO
ECONOMIZED
OPERATION
UNLOADED OPERATION
AIR CIRCULATION
HEATING
NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT
T-334
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+2.5C
(4.5F)
+.20C
SET POINT
-0.20C
-0.5C
(0.9F)
NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT
Figure 4- -3 Controller Operation - Perishable Mode
FALLING
TEMPERATURE
START UNLOADED,
TRANSITION TO
ECONOMIZED
OPERATION
AIR CIRCULATION
Figure 4- -4 Controller Operation - Frozen Mode
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FALLING
TEMPERATURE
MODULATED
COOLING
UNLOADED
SET POINT
AIR CIRCULATION
HEATING
TEMPERATURE
COOLING
ECONOMIZED
+.20C
SET POINT
-0.20C
AIR CIRCULATION
4--6
RISING
TEMPERATURE
+2.5C
(4.5F)
MODULATED
COOLING
UNLOADED
+.20C
AIR CIRCULATION
-0.20C
-0.5C
(0.9F)
HEATING
RISING