The Wizard Critical Products Control System is designed to control the room or zone temperatures and the evaporator operations for critical product refrigerated storage rooms. The Wizard performs the functions of the following independent control systems:

           Temperature Control

           Defrost Clock

           Temperature Monitoring and Alarming

           Refrigerant Gas Leak Monitor

           System Shutdown

           Temperature Recorder

           Alarm System

The Wizard CPCS can be configured to operate as an independent system, or as the controller of side of a completely redundant system.

Each Wizard 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 Wizard will maintain the space temperature by cycling the LLS based upon a Temperature Setpoint and a plus/minus differential. The Wizard will open the LLS when the temperature reaches T = Setpoint minus Differential Value. The Wizard will close the LLS when the temperature reaches T = Setpoint plus Differential Value.

The Wizard 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 or off-time defrost. The Wizard will cycle all valves necessary to perform a Hot Gas defrost of some of the more complex refrigeration systems.

During a defrost cycle the Wizard will sequence the following as required:

           Liquid Line Solenoid

           Evaporator Fan Motor Starter

           Defrost Control Circuitry

                   Hot Gas Valve

                   Electric Defrost Contactor

                   Water Valves

Defrost Features

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

Defrost Cycle Steps. The Wizard CPCS allows the user to program the lengths of the following defrost cycles:

           Pump Down

           Defrost

           Drip Cycle

           Fan Start Delay.

Automatically adjusts time for daylight savings. The Wizard 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 Wizard 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, or Air defrosts. The Wizard can operate defrost circuits that are 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.

Manually Activated Force Defrost Input The Wizard 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 Wizards can be staged evenly or to a frost sensor and the Wizard will defrost only when necessary.

           Clicks-On Thermodisk (Dry Contact).

           Suction Pressure Switch (Dry Contact).

           Termination Temperature Sensor.

           Time.

Defrost Termination Log. The Wizard has a "Defrost Log" that records the duration of the previous 10 defrost cycle Defrost stages. This log can be used to determine whether the current defrost setup is operating efficiently or whether adjustments need to be made

The Wizard can monitor two independent temperature sensors, the Temperature Control Sensor and the Defrost Termination Sensor. The Wizard will produce an alarm signal based upon a number of additional alarm conditions.

Temperature Alarm -- This alarm is based upon the reading produced by the sensor used for temperature control. All alarming is disabled during defrost. Once the Wizard controller returns to normal refrigeration, the alarm delays will begin as if the sensor has just exceeded the alarm conditions.

The Wizard will activate three independent alarm schemes based upon this sensor:

           High Temperature Level One, "Alert" Level

           High Temperature Level Two, "Action" Level

           Low Temperature Alarm Level.

Defrost Termination / Coil Recovery Alarm -- The Defrost Termination sensor consists of the sensor used by the Wizard to terminate the defrost cycle based upon the coil temperature. Should this temperature read above the setpoint level of the termination setpoint for over 30 minutes, the Wizard will activate its systems alarms.

Door Open Alarm -- The Wizard can monitor a Normally Open Dry Contact Door Switch. This switch will indicate whether the door is open or closed. A user definable alarm delay is set and when the door is left upon for a duration exceeding this delay, the Wizard will activate the System Alarm Scheme.

           Door Open Log -- The Wizard has a timer log that counts the total amount of time that a door is open over a 24 hour period. This log is retain for a period of 10 days. At any time, a user can access this log and determine the amount of time that the walkin door is open.

Compressor Failure Alarm -- The Wizard can monitor a Normally Open Dry Contact Compressor Proofing Switch provided by the condensing unit manufacturer. This switch will indicate whether the compressor is on, running, or off. When the Wizard calls for refrigeration, the unit will begin a timer. If the compressor proofing switch does not indicate a run signal after a user definable delay, the Wizard will activate the System Alarm Scheme.

Alarm Signals. The Wizard has a standard, on board 90 dBA buzzer that will sound whenever the unit goes into an alarm condition. Status LEDs will indicate which alarm condition is active and the LCD Display will display the specific alarm conditions.

The Wizard makes any refrigerated room Uniform Mechanical Code Compliant with the addition of a Sherlock Refrigerant Sensor. The Wizard will activate alarms based upon two alarm levels. At the first alarm level, the Wizard will activate the Gas Leak Level One Alarm Relay, activating any alarm notification system connected to the Wizard. At the second alarm level, the Wizard 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 Wizard gives the user an option to pump down, then isolate the evaporator coil should the leak concentration exceed level two.

The Sherlock Refrigerant Gas Sensor acts as an analog signal generating sensor when 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.

Sensors are available in specific configurations that detect certain refrigerant gases.

The Wizard allows you to set 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 programable 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 Wizard has a programable option that will pump down and isolate the coil when the Sherlock senosr reading exceeds the Alarm Level 2 Alarm Setpoint.

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 Wizard IO Board to a refrigerant gas monitoring system (by others) or another Wizard configured to monitor for refrigerant leaks, the Wizard can properly isolate an evaporator coil during an alarm condition

Standby Control Method - The Control Method determines the action necessary to initiate and terminate Standby/Shutdown. Standby can be controlled by any one of the following four methods:

            Dry Contact Closure - Should a contact close across Input # 6 on the Wizard Input Board, the Wizard will go into Standby/Shutdown. The control will remain in Standby/Shutdown until the contact opens.

           Manually Forced - The control will go into its Standby/Shutdown mode when the "Standby Mode" is changed to "Man", or manual. The control will remain in Standby/Shutdown until the "Standby Mode" is changed back to "Norm". See Below.

           Daily Schedule - If the "Standby Mode" is set to "Sch", the Wizard will go into Standby/Shutdown at the same time daily. This schedule will remain active until the "Standby Mode" is changed back to "Norm".

        Gencom Communications Interface - The Wizard Control Panels within a facility can be placed into Standby/Shutdown via Gencom Communications System. From a computer panel, the operator can force all or some of the Wizard Panels into Standby/Shutdown. This operation will internally change the "Standby Mode" from "Norm" to "Man". The controllers will return to normal either when the operator resets the Standby Flag or when the "Standby Mode" is reset to "Norm" within the Standby Ctl Menu.

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

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 Wizard is configured for Leak Monitoring.

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.