The Wizard WEC Evaporator Control System is designed to control the room or zone temperatures and the evaporator operations for large ammonia and halocarbon refrigeration systems. The WEC performs the functions of the following independent control systems:

The WEC has a series of status LEDs on the front panel that provide an easy method to determine the status of the Evaporator Valves and contactors.

The WEC is an electronic control and time clock. The time clock can operate up to 12 defrost cycles per day with three separate defrost schedules as well as manual defrost. The defrost can be either gas, electric, water or off-time defrost. The WEC will cycle all valves necessary to perform a defrost of some of the more complex refrigeration systems.

During a defrost cycle the WEC will sequence through the following cycles as required:

Pumpdown Cycle                     Pumpdown Cycle

SoftGas Cycle                           Pre-Heat Cycle

Hot Gas Cycle                           Main Electric Defrost Cycle

Drip Cycle                                  Drip Cycle

Equalizer Cycle                         Equalizer Cycle

Fan Start Delay                         Fan Start Delay

Water Defrost                         Off-time Defrost

Pumpdown Cycle                     Main Defrost Cycle

Water Stage1 Cycle

Main Water Defrost Cycle

Daily Schedules. The control has three unique defrost schedules: Weekday (Monday - Friday), Saturday and Sunday.

Automatically adjusts time for daylight savings. The WEC can be set to automatically change the clock for day light savings or can be set not to change if the facility is in states where daylight savings is not observed. The Daylight Savings Schedule is set through 2020.

Can schedule up to 12 defrost cycles per day. The WEC can be programmed to run up to 12 defrost cycles per day. The control will automatically space out each cycle evenly or allow the user to program the start times.

Gas, Electric, Water, or Air defrosts. The WEC can operate defrost circuits that are either Off-time, Hot Gas, or Electric. Steps that are not used can be set to 0 minutes, and the controller will skip over them to the next step.

Demand Defrost - Liquid Line Solenoid Feed Time. The WEC can initiate its defrost cycles base upon the total liquid feed time. This option can be used to activate the system only when the "Number of Cycles per Day" set to zero. The liquid demand delay can range from 0 to 24 hours, in fifteen minute increments.

Demand Defrost - Remote Activation The WEC has a digital input that forces the control into the defrost cycle. This input can be used to activate the system for an additional defrost cycle, or with the "Number of Cycles per Day" set to zero, the input can be wired to a gang defrost clock and a number of WECs can be staged evenly or to a frost sensor and the WEC will defrost only when necessary.

Defrost Termination. Any one of the following functions will terminate the Main Defrost Cycle:

Each WEC comes with a temperature sensor for monitoring or controlling the temperature in the refrigerated room. The control monitors for both high and low alarms each having its own programmed delay when programmed. The WEC will maintain the space temperature by cycling the LLS based upon a Temperature Setpoint and a plus/minus differential. The WEC will open the LLS when the temperature reaches T = Setpoint minus Differential Value. The WEC will close the LLS when the temperature reaches T = Setpoint plus Differential Value.

Temperature Control Setback -- The WEC allows the user to set a setback schedule, where the control will operate the temperature control functions at a higher setpoint during a specified time period. The setback schedule has a Monday - Friday, a Saturday, and a Sunday schedule.

Fan Cycling -- The WEC can cycle the evaporator fans once the temperature within the space is met. The WEC will also restart the fans after a setable delay to prevent stratification of the air.

The WEC can monitor three independent temperature sensors, the Temperature Control Sensor, the Defrost Termination Sensor, and an Auxiliary Temperature Sensor.

The WEC will activate its "System Alarm" relays when the space temperature exceeds the Hi Temp Alarm Limit for a duration longer than the Hi Alarm Delay or when the space temperature goes below the Lo Temp Alarm Limit for a duration longer than the Lo Alarm Delay. The WEC will activate the System Alarm Relay based upon the following alarm conditions:

Refrigeration Leak Monitoring.

The WEC makes any refrigerated room ASHRAE 15, IIAR 2, and Uniform Mechanical Code Compliant with the addition of a Sherlock Refrigerant Sensor. The WEC will activate alarms based upon two alarm levels. At the first alarm level, the WEC will activate the Gas Leak Level One Alarm Relay, activating any alarm notification system connected to the WEC. At the second alarm level, the WEC will activate the Gas Leak Level Two Alarm relay, activating additional alarm indication equipment and any additional safety procedures as required by local codes. The WEC gives the user an option to pump down, then isolate the evaporator coil should the leak concentration exceed level two.

Gas Leak Sensors - The Sherlock Refrigerant Gas Sensor is connected to the control module via a discrete, three conductor cable. The sensor can be mounted up to 800 feet away in locations where leaked refrigerant is likely to concentrate.

The gas sensors are available in two varieties:

Alarm Level Settings - The WEC allows two unique Alarm Setpoints for the refrigerant gas sensor throughout its operating range. When an Alarm Setpoint is exceeded, a corresponding alarm relay is activated Each Alarm Setpoint has a programmable Alarm Delay, 1 to 120 minutes. The sensor reading is required to exceed an Alarm Setpoint for the programmed amount of time before the control activates the corresponding alarm relay contacts. For example, if the Alarm Setpoint is 200 and the Alarm Delay is five minutes, the control will enter an alarm condition only if the sensor detects a level of 200 or higher for more than five minutes.

The WEC has a programmable option that will pump down and isolate the coil when the Sherlock sensor reading exceeds the Alarm Level 2 Alarm Setpoint.

With the high costs of electricity and the requirements for reducing energy usage during periods of high demand, many companies are looking for assistance with their load curtailment programs.

Some utilities are setting up Demand Response and Load Curtailment programs to compensate energy consumers for temporarily reducing their demand for power. Consumers reduce loads by shutting off equipment or adjusting their operations to reduce energy usage.

The WEC Evaporator Control System can allow the user to change the Temperature Control Setpoint to a higher value in order to reduce energy demand.

Load Shedding Initiating Methods:

    1) Dry Contact Closure - The WEC has a dry contact input for Load Shedding Operation.  This input can be connected to a Load Monitor, a Current Switch to activate the Load Shedding routine when the facility approaches a high demand levels, or a manual switch.

    2) Manually Forced - The WEC will operate in the Load Shedding mode if forced in the control software.

    3) Daily Schedule - If activated, the WEC will go into Load Shedding at the same time daily.

    4) Gencom Communications Interface - The WEC Control Panels can be placed into Load Shedding via Gencom Communications System.

Some refrigerated facilities need to be placed into Shutdown or Standby at certain times, whether they are a seasonal facility (i.e. only stores produce during the harvest season), require maintenance or cleaning, or a production room where the room is not used during the overnight hours.

Another use of the Shutdown procedures is when a refrigerant leak is detected within the refrigerated space. y connecting the Dry Contact Input #6 on the WEC IO Board to a refrigerant gas monitoring system (by others) or another WEC configured to monitor for refrigerant leaks, the WEC can properly isolate an evaporator coil during an alarm condition

Load Shedding Initiating Methods:

    1) Dry Contact Closure - The WEC has a dry contact input for Standby (Shutdown) Operation. 

    2) Manually Forced - The WEC will shutdown operations forced in the control software.

    3) Daily Schedule - If activated, the WEC will go into Standby at the same time daily.

    4) Gencom Communications Interface - The WEC Control Panels can be placed into Standby via Gencom Communications System.

Additional options include:

    1)  Fans Run During Standby - The option of whether to shut off the fans when the evaporator is shutdown.

    2)  Refrigerant Leak Monitoring during Standby - During cleaning of a process room, the temperature and humidity of the room can increase dramatically. These increases may cause false alarms with the leak alarms. This parameter gives the operator an option of continuing to monitor for refrigerant leaks during shutdown.

Note: This parameter is visible only when the WEC is configured for Leak Monitoring.

With an optional Remote Temperature and Humidity Sensor, the WEC can Monitor, alarm, and log the humidity of the room.

De-Humidification

The WEC will cycle a control relay based upon the humidity of the space. The WEC will utilize avaliable refrigeration to remove moisture from the air and will cycle a re-heat circuit to maintain the room temperature.

The WEC will record 1500 temperature log entries into its internal memory. The Logging Interval can be set from 1 minute to 120 minutes. This information is retrievable via the front display or with the GenCom for Windows software package. With the optional GenCom Communication Kit the WEC can be operated remotely. The GenCom Kit allows the user to view and change the settings, view and respond to alarm conditions, check and report the status of all of the WEC at the site and place any of the controls into manual defrost. One kit can operate up to 250 Genesis controls in one location. If the user has the Premium Model, GenCom can be used to graph the data log.

To read this stored data, the facility must have a GenCom Communications Network installed and connected to either a modem or directly to a computer. The computer operator can then download the data log, print the graphs of the logged data, and store this data either on the computer hard/floppy disk or print the data in a table format.

GenCom Communications allows the computer operator to access the controllers within a facility via a PC. All control programming and logging functions are accessible and can be set or changed from the computer. The user can view all text and data logs, make programming changes to the controller, initiate defrost cycles, and investigate alarm conditions.