Ranco EcoCool E7 Series Operating and maintenance instructions

1
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
354-00027-001 Rev. D
Temperature and
Defrost Controller
Type E7
EcoCool™Controller and Configuration Software
Installation and Configuration

2
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
CONTENTS
1 How to use this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 E71R and E72R controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Installing the controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1.1 Wiring the controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Mounting the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Wiring the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Functions and features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1.1 User control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1.2 Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1.3 Status indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.4 Defrost control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1.5.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1.5.2 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1.6 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.7 Sensor failure mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Device and software configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Controller and interface box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.1 Interface box overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.2 Connect the interface box to the computer and E71R or E72R controller. . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 EcoCool configuration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.1 Minimum computer requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.2 Software overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.3 Install and start EcoCool configuration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.4 Uninstalling EcoCool configuration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.5 Tabbed configuration parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.5.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2.5.2 Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2.5.3 Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2.5.4 Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.5.5 Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2.5.6 Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2.5.7 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.5.8 Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
6.2.6 Saving and opening configuration files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2.7 Transferring configuration files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2.7.1 Downloading a configuration file to a controller from EcoCool configuration software: . . . . . . . 24
6.2.7.2 Uploading a configuration file from a controller to EcoCool configuration software: . . . . . . . . . 24
6.2.8 Transferring firmware between EcoCool configuration software and a controller . . . . . . . . . . . . . . . . . . 25
6.2.8.1 Installing firmware on a controller using EcoCool configuration software:. . . . . . . . . . . . . . . . . 25
6.2.8.2 Uploading firmware from a controller:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2.9 Generating reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2.10 Restoring default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3 Copy card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.1 Transferring firmware between a copy card and EcoCool configuration software . . . . . . . . . . . . . . . . . 26
6.3.2 Downloading a configuration from EcoCool configuration software into a copy card . . . . . . . . . . . . . . . 27
6.3.3 Uploading a configuration from a copy card into EcoCool configuration software . . . . . . . . . . . . . . . . . 27
6.3.4 Installing firmware or a configuration file into a controller from a copy card . . . . . . . . . . . . . . . . . . . . . 27
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 Electrical rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Temperature control range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.4 Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5 Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.6 Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.7 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9 Responsibility and residual risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4
1 HOW TO USE THIS MANUAL
The following conventions are used in this manual.
Callout column:
Callouts on the topics described are placed to the left of the text to allow the user to find the desired information quickly.
Icons
Some parts of the text are highlighted using icons that have the following meanings:
NOTE: Draws attention to a specific topic that users should take into account.
TIP: Highlights a suggestion that helps users to understand and use the information on the topic described.
WARNING: Highlights information that may damage the system or place persons, equipment, data, etc at risk if not known. These sections must
always be read prior to use.
2 INTRODUCTION
The E71R and E72R EcoCool™controllers are microprocessor based electronic temperature and defrost controllers for use in compressor-driven commercial
freezers and refrigerators. The E71R includes one relay for a refrigeration compressor or refrigeration solenoid valve. The E72R includes one relay for a
refrigeration compressor or refrigeration solenoid valve and one relay for a defrost heater and optional fan.
3 E71R AND E72R CONTROLLERS
3.1 Overview
E71R / E72R Controller
WARNING: A separate switch must be installed to disconnect the controller, compressor, and fan from line voltage for service.
Both controllers allow configuration of cut-in and cut-out temperatures and defrost scheduling for precise temperature control. An adjustment knob allows
the user to select a configured cold setpoint, warm setpoint, or any setpoint within this range. Optionally, the adjustment knob also can be configured with
ON/OFF functionality to power off the controller for non-service purposes. To prevent setpoint adjustment with the adjustment knob, a fixed setpoint can be
configured. The E71R and E72R can defrost the evaporator using an off-cycle defrost that powers off the compressor for a specified time period or until a
specified evaporator temperature is reached. Additionally, the E72R includes a second relay that can be used to energize a defrost heater or reverse cycle
solenoid valve to defrost the evaporator coil. Controller configuration is designed on a computer using EcoCool configuration software and is downloaded into
the controller from the computer or a copy card.
Three status LEDs (red, yellow, and green) display the system status. Temperature and fault alarms, defrost status, and compressor operation are indicated
by the LEDs.
An optional remote digital display shows the control temperature and, during adjustment, changes to the setpoint. It can be configured to show for the
duration of the defrost cycle the actual temperature, the temperature that was sensed at the moment the defrost cycle started, or dF. The display also
includes three system status LEDs.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
ED1
Callout
Column
Icons

5
Optional Display
To minimize temperature alarms during start up, defrost, and temperature fluctuations, alarm delay timers can be configured. The controllers can be
configured to start defrosting based on the elapsed system-on time, the accumulated run time of the compressor, or the difference in temperature between
the evaporator sensor and the control sensor. Defrosting can be terminated by elapsed time, the evaporator or control temperature sensor, or by a
temperature switch. If the control temperature sensor fails, the compressor can be powered on, powered off, or follow a configured duty cycle.
The controllers include the following physical features:
• Knob for setpoint adjustment
• Two temperature sensor inputs for a control probe and an evaporator probe
• One digital input for an optional defrost termination switch
• E71R Controller: One relay for a refrigeration compressor
• E72R Controller: One relay for a refrigeration compressor and one relay for a defrost heater and fan
• 90V to 240V AC switching power supply
• Connection for configuration or optional display
• Plastic enclosure and compact size for easy installation in most appliances
• Customizable control parameters
• Flash-memory microprocessor for quick and inexpensive configuration and firmware downloads at the factory or in the field
• Adjustable mounting clips for panel or bracket mounting
4 INSTALLATION
4.1 Installing the controller
The controller can be mounted in a panel cutout with the LEDs showing, mounted behind a panel with only the adjustment shaft exposed, or mounted
completely within the case.
To mount the controller with the face exposed, cut a 2 26/32” by 1 5/32” (71 mm x 29 mm) hole in the panel. Insert the controller from the outside of the
panel and slide a mounting clip onto each side of the controller from behind the panel.
Optionally, the controller can be mounted to a bracket inside the case.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
2 26/32” (71 mm)
1 5/32”
(29 mm)
Exposed Face
Cut-out

6
4.1.1 Wiring the controller
WARNING: Before wiring the controller, make sure that the refrigeration unit, fan, heater, and controller are not connected to the electrical supply.
Do not apply voltage to the digital input.
WARNING: If the compressor and a fan are connected to the same relay on the controller, the total current drawn by the compressor and fan must
not exceed the value shown in section 8.4 Terminations.
Use insulated spade connectors to connect the controller to the output loads. If your line voltage uses a neutral line and a phase line, connect the phase line
to the phase terminal(s) on the controller. Line 1 and Line 2 connections on the controller are not phase dependent. Connect the control sensor, optional
evaporator sensor, and optional defrost termination switch using the screw terminal block.
E71R with Control Sensor and Optional Evaporator Sensor
E72R With Control Sensor, Optional Evaporator Sensor, Defrost Heater, and Defrost Fan
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
E71R
Wiring Example
E72R
Wiring Example

7
4.2 Mounting the display
The optional display can be flush mounted in a panel cutout up to 30ft (10m) from the controller. To mount the display flush to the panel, cut a 2.32” by 1”
(64mm x 31mm) hole in the panel. Insert the display from the outside of the panel. Friction tabs on the sides of the display hold it in place.
4.3 Wiring the display
Use the Interface Box, Copy Card, and Display TTL Connector on the controller to connect to the display.
5 FUNCTIONS AND FEATURES
5.1.1 User control
The adjustment knob can be rotated to select any control temperature within the configured range.
The OFF and ON positions of the adjustment knob can be set to specific angles relative to full counter clockwise. Rotating the adjustment knob fully counter
clockwise (to OFF) powers off the controller and compressor immediately. However, hazardous voltage remains. The controller, compressor, defrost heater,
and defrost fan must be disconnected, prior to service, using a separate switch. If the On/Off Function is enabled and the knob is in the OFF position, rotating
the knob clockwise powers on the controller.
5.1.2 Control mode
The controller cycles the compressor or refrigeration solenoid valve to maintain the selected control temperature.
The warm and cold adjustment knob positions are configured using four setpoints. Cut-In Warm and Cut-Out Warm are the setpoints for the warm position.
Cut-In Cold and Cut-Out Cold are the setpoints for the cold position. The cold position is full clockwise rotation. The warm position is full counter clockwise
rotation or, if the On/Off Function is enabled, the specified angle. When the user sets the adjustment knob to a setpoint between the warm and cold
positions, the Cut-In and Cut-Out setpoints are calculated by the controller. The setpoints can be configured using Celsius or Fahrenheit units.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
ED1
2.32” (58.9 mm)
1”
(25.4 mm)
Cut-In
Cut-Out
User selected
Cut-In and Cut-Out Setpoints
Cut-In Cold Setpoint
Cut-In Warm Setpoint
Cut-Out Cold Setpoint
Cut-Out Warm Setpoint
User Selected
Position
Knob Position
Cold Position
Warm Position
OFF
T
e
m
p
e
r
a
t
u
r
e
Display
Mounting
Cut-out
Differentials

8
When the adjustment knob is set to the warm position and the controlled space temperature is equal to or greater than the Cut-In warm setpoint, the
compressor or solenoid valve is energized until the controlled space temperature is equal to or less than the Cut-Out warm setpoint. Similarly, when the
adjustment knob is set to cold, the compressor or solenoid valve is energized when the temperature is equal to or greater than the Cut-In cold setpoint and
de-energized when the temperature is equal to or below the Cut-Out cold setpoint. For adjustment knob positions between warm and cold, the controller
interpolates the cut-in and cut-out setpoints from the four configured setpoints.
The optional display changes from the control temperature to the Cut-Out setpoint during adjustment and reverts to the control temperature three seconds
after adjustment. Because the four setpoints are configured independently, the differential can remain constant or change linearly between the cold and
warm settings.
Refer to the graphs below for various setting scenarios.
The compressor can be protected against short cycling by three time delays. The Compressor Minimum Off Time at Start delay begins counting down
when the controller is powered on. The compressor cannot be powered on before this delay expires. If the ON/OFF function is enabled, the timer does not
count down while the adjustment knob is in the OFF position. When the compressor is powered on the Compressor Minimum On Time delay begins
counting down. The compressor is not powered off by the controller before this delay expires regardless of the control temperature or setpoint. However, if
the adjustment knob is rotated to OFF the controller and compressor are immediately powered off. When the controller powers off the compressor, the
Compressor Minimum Off Time delay begins counting down. The compressor is not powered on before this timer expires regardless of control temperature
or setpoint.
TIP: An excessive Compressor Minimum On Time or Compressor Minimum Off Time can force the temperature past an alarm threshold and trigger a
temperature alarm.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
Cut-In
Cut-Out
Warm
Position
Setpoints
Cold
Position
Setpoints
T
e
m
p
e
r
a
t
u
r
e
Adjustment Knob Setpoint Range
Variable Differential
Cut-In
Cut-Out
Warm
Position
Setpoints
Cold
Position
Setpoints
T
e
m
p
e
r
a
t
u
r
e
Adjustment Knob Setpoint Range
Wide Differential
Cut-In
Cut-Out
Warm
Position
Setpoints
Cold
Position
Setpoints
T
e
m
p
e
r
a
t
u
r
e
Adjustment Knob Setpoint Range
Narrow Differential
Cut-In
Cut-Out
Warm
Position
Setpoints
Cold
Position
Setpoints
T
e
m
p
e
r
a
t
u
r
e
Adjustment Knob Setpoint Range
Constant Cut-In
Cut-In
Warm
Position
Setpoints
Cold
Position
Setpoints
T
e
m
p
e
r
a
t
u
r
e
Adjustment Knob Setpoint Range
Fixed Setpoint
Cut-Out

9
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 ONOFF
e
ssor
u
m
e
OFF OFF
Compressor or Refrigeration
Defrost Cycle
T
emperature or
Sensor Alarm
Compressor
Powered On
Typical
Compressor
Cycles

10
The controller can also be configured with a Temperature Initiated Defrost Function to start defrosting if it senses too great a difference between the
control temperature and the evaporator temperature. Temperature Initiated Defrost Time Delay begins counting down if the evaporator temperature is less
than 32ºF (0ºC) and an excessive temperature difference is sensed. Defrost starts if the temperature difference still exists when the delay expires. This
temperature initiated defrost delay prevents defrost from starting if the air space temperature temporarily increases (e.g. the door is left open). The
temperature difference and delay are both configured.
Temperature Initiated Defrost Time Delay after Defrost begins counting down when refrigeration starts after defrost. This delay is typically longer than
Temperature Initiated Defrost Time Delay to prevent another defrost before the sensed temperatures return to normal. When Temperature Initiated Defrost
Time Delay after Defrost expires, the controller resumes use of Temperature Initiated Defrost Time Delay as described above. Temperature Initiated Defrost
Time Delay after Defrost permits a shorter Temperature Initiated Defrost Time Delay without the risk of starting defrost due to a lagging control temperature
after defrost.
Temperature initiated defrost is independent of time initiated defrost and can start before the Time to subsequent defrosts timer expires.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
Cut-In
Defrost Termination Temp
Cut-Out
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Time
Controller
Power on
Compressor or Refrigeration
ON ON ONOFF OFF OFF ON OFFOFF
Compressor
Minimum On
Time
Time to
First Defrost
Time to
Subsequent Defrosts
Defrost
Termination
Cut-In
Defrost Termination Temp
Cut-Out
T
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p
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Time
Defrost Delay Defrost Delay
After Defrost
(Defrost Prohibited)
Control Minus Evaporator
Starts Defrost Delay
Evaporator
Sensor
Control
Sensor
Defrost Termination
Defrost Start
Time Initiated
Defrost
Temperature
Initiated Defrost