Ranco EcoCool E7 Series - 5.1.3 Status indications; 5.1.4 Defrost control

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5.1.3 Status indications
Three LEDs in the face of the controller indicate the status of the controller. The green LED illuminates while the compressor is powered on. The yellow LED
illuminates while the controller is in a defrost cycle. The red LED illuminates if the control temperature exceeds an alarm threshold or flashes if a
temperature sensor circuit is shorted or open. The remote display includes three red LEDs that provide the same indications (see 5.1.6 Display).
5.1.4 Defrost control
The defrost functionality can be based on the appliance operating time between defrosting cycles, the accumulated compressor run time between defrosting
cycles, or it can be disabled. If the Defrost Function is disabled, all defrosting features are disabled.
The controller can start a defrost cycle when it is powered on or after the expiration of the Time to First Defrost delay. If Defrost Cycle at Power On is
enabled, the controller starts a defrost cycle when it is powered ON or after a power interruption (power cycle). If Defrost Cycle at Power On is disabled, the
Time to First Defrost timer starts counting down when the controller is powered on. The controller starts a defrost cycle when the timer expires. After the
completion of the first defrost cycle, the Time to subsequent defrosts timer starts counting down. When it expires, defrost starts. At the end of the defrost
cycle, the timer resets and restarts.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
Cut-In
Cut-Out
T
e
m
p
e
r
a
t
u
r
e
Time
Controller
Power on
Compressor
Minimum
Off Time
at Startup
Compressor
Minimum
On Time
Compressor
Minimum
On Time
Compressor
Minimum
OFF Time
C
ompr
e
Mi
n
i
m
u
On Tim
e
ON ON OFF
e
ssor
u
m
e
OFF
OFF
Compressor or Refrigeration
Defrost Cycle
T
emperature or
Sensor Alarm
Compressor
Powered On
Typical
Compressor
Cycles