Table of Contents
Summary of Contents for Master Bilt Master Controller 2.0
- Page 1 Master Controller 2.0 Reverse Cycle Defrost System Installation & Operations Manual An Electronic Microprocessor-Based Electric Expansion Valve Refrigeration Control System With TCP/IP Internet Monitoring Feature January 2012 PN 888-88889...
- Page 2 IMPORTANT NOTICES • Read this manual before installing your Master Controller 2.0 system. Keep the manual and refer to it before doing any service on the equipment. Failure to do so may result in personal injury or waive warranty of damaged equipment.
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Page 3: Table Of Contents
REVERSE CYCLE DEFROST ...................23 General Information....................23 Advantages ......................23 Factory-Installed Parts....................23 Eliminated Parts .......................24 Defrost Time......................24 Charging a Master Controller 2.0 System Equipped with Reverse Cycle Defrost ...24 ELECTRIC WIRING ......................24 ....................25 TYPICAL WIRING DIAGRAMS TYPICAL SET POINTS FOR CONTROLLER..............28 TROUBLESHOOTING GUIDE....................29 Troubleshooting Electric Expansion Valve ..............30... -
Page 4: Introduction
INTRODUCTION Thank you for purchasing a Master-Bilt Master Controller 2.0 Reverse Cycle Defrost system. This manual contains important instructions for installing, using and servicing the system as well as a parts list. Read this manual carefully before installing or servicing your equipment. -
Page 5: Warning Labels And Safety Instructions
Follow all warning label instructions. If any warning or safety labels become lost or damaged, call our customer service department at 800-684-8988 for replacements. This label is on the housing of the Master Controller 2.0 typically located on an evaporator coil. APPLICATIONS Master Controller 2.0 Reverse Cycle Defrost systems are designed to control Master-Bilt made condensing... -
Page 6: Master Controller
The Master Controller 2.0 is a custom-designed microprocessor-based electronic controller for Master-Bilt refrigeration products to control an electric expansion valve in response to evaporator superheat and return air temperature. The hardware and input/output descriptions and connections of a Master Controller 2.0 are shown below. - Page 7 SEI or SER Terminals. Sporlan SEI and SER type electric expansion valves are currently used for all • applications. There are 1596 nominal steps for entire valve stroke. Pressure Transducer is mounted at the evaporator suction header to measure saturated suction pressure in •...
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Page 8: Factory-Mounted Parts
Evap Coil In/ Defrost Temp. Sensor Evaporator Liquid Line Pressure Transducer Suction Line Distributor Electric Room Temp Sensor Evap out / Fan Delay Expansion Temp Sensor Valve T1 T2 T3 ADVANCED MASTER CONTROLLER Figure 2. Factory-Mounted Parts A controller board, an electric expansion valve, a pressure transducer, and three temperature sensors •... -
Page 9: Features
Features One of the most energy-saving features of the Master Controller 2.0 Reverse Cycle Defrost system is • free floating head pressure. A head pressure control is not installed on Master Controller 2.0 systems. Without this control, compressors work at the highest efficiency at the lowest possible condensing pressure rather than at the limited pressure level typically found in conventional systems using a head pressure control valve for low ambient environments. -
Page 10: Sequences Of Operation
Sequences of Operation START UP When power is applied to the board, the controller closes the valve. The controller will display ‘STUP’ on its four-digit display for five seconds. It will then display ‘CKFN’ on the four-digit display for 10 seconds. The evaporator fans will be on for the first 15 seconds allowing a service technician time to check them. -
Page 11: Defrost Mode
After selecting the demand defrost, if the elapsed time since the last defrost has been a selectable time (INTV) from 8 hours (480) to 72 hours(4320), the Master Controller 2.0 will go into defrost to ensure a proper oil return. -
Page 12: Manual Defrost
Manual Defrost The controller allows manually-initiated defrost when needed. The manual defrost will be disabled if the evaporator inlet sensor detects the temperature higher than the defrost termination temperature. Operation of the manual defrost will be discussed in a later section. COIL DRAIN MODE (DRAN) The controller automatically goes into COIL DRAIN whenever a defrost is terminated. -
Page 13: Multiple Evaporator Configuration
• Multiple Evaporator Configuration The Master Controller 2.0 can be configured with 0 to 7 other controllers. Each controller is appointed a static I/P address at the factory for communication and sequence of operation. The evaporators are piped together to one condensing unit. -
Page 14: Alternating Mode
run in ‘SAFETY MODE’ as described previously. The ‘communication alarm’ clears when it receives any command from that controller. The controllers switch between ‘COOL’ mode and ‘OFF’ mode based on the warmest temperature reading from all controllers that have a room temperature sensor. If any controller decides to go in defrost, all controllers will then go into defrost. - Page 15 A list of the parameters that can be displayed and/or changed is shown below when access to the default settings is needed. This access is usually done by a trained technician. The Following display are for viewing the status of the refrigeration system and cannot be changed Control Board Output RMTP...
- Page 16 The Following list indicates parameter values of the controller and may be changed to customize the refrigeration system Control Board Output REFT Refrigerant Type (If REFT = 404A, then R-404A refrigerant, If REFT = R22, then R-22 refrigerant) SHSP Superheat Set Point seen at the evaporator (5ºF to 20ºF) Room Temperature Set Point or "cut-out"...
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Page 17: Alarm Display
ALARM DISPLAY Any alarm will cause alarm relay to switch. All alarms have a distinct display shown on the four-digit display on the controller. The red LED will be on for a pressure or suction temperature sensor alarm and the amber LED will on for all other alarms. - Page 18 Press the right or left button until ‘MNMD’ (Manual Mode) is displayed. Press the MANUAL VALVE ‘ENTER’ button. If ‘PSWD’ (Password) is displayed, press the ‘ENTER’ button again. The display should read ‘0000’ with the 0 on the right blinking. Enter the password ‘0002’...
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Page 19: Temperature Sensors
Three temperature sensors are used in the Master Controller 2.0 refrigeration system. They are the room temperature return air sensor, the evaporator defrost termination temperature surface sensor and the evaporator outlet (suction line) temperature surface sensor. -
Page 20: Pressure Transducer
NOTE: Use resistance at 32 F for sensor checking. Pressure Transducer Your Master Controller 2.0 will be equipped with one of two types of pressure transducer (PT). The difference is in the color of sensor wires as noted below: New PT... -
Page 21: Charging The Master Controller 2.0 Refrigeration System
Charging the Master Controller 2.0 Refrigeration System Note: If you are a first time installer of a Master Controller 2.0 system, please call Master-Bilt for on-phone training. Since the system is designed with free floating head control, the head pressure control valve is not installed in this type of system. -
Page 22: Technical Notes
(1) Charge the system by weighing exact amount of refrigerant specified by Master-Bilt for the unit. Or, (2) Charge 50% of the liquid receiver (if provided) rated holding capacity. Let the system run through the pull down period until room temperature is closely reached, then gradually add refrigerant until actual superheat “SUPH”... -
Page 23: Reverse Cycle Defrost
REVERSE CYCLE DEFROST General Information Master-Bilt’s patented (U.S. patent no. 7,073,344) reverse cycle defrost is a standard feature on Master Controller-equipped refrigeration systems. A reverse cycle valve is already factory-installed on the condensing unit. The valve’s primary function is to reverse the direction of the refrigerant flow during defrost. -
Page 24: Eliminated Parts
Please make sure to turn all power off before servicing electrical equipment. Always use a qualified and trained technician. If you are the technician and a first-time installer of a Master Controller 2.0 system, call our service department at 800-684-8988 for free training and support. -
Page 25: Typical Wiring Diagrams
TYPICAL WIRING DIAGRAM (AIR DEFROST) N.O. - Page 26 TYPICAL WIRING DIAGRAM (REVERSE CYCLE DEFROST) N.O.
- Page 27 TYPICAL WIRING DIAGRAM (ELECTRIC DEFROST) Note: For feature configuration, please refer to the wiring diagram in the actaul system for installation.
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Page 28: Typical Set Points For Controller
TYPICAL SET POINTS FOR AMC CONTROLLER 2.0 Air/Electric Defrost Reverse Cycle Defrost Low Temp High Temp Low Temp High Temp SHSP RMSP MXDT DTSP PMDN DRAN DFPD HITA HIDL LOTA MOTM MRTM AIRD MNPR INTV 1440 1440 DFMD ELEC ELEC HGDF HGDF REFR... -
Page 29: Troubleshooting Guide
TROUBLESHOOTING GUIDE Use the alarm display together with the chart below to check the causes of each error message. Trouble, Alarm Codes Causes Corrective Actions Pressure transducer alarm • Bad transducer • Replace the pressure transducer PRSA • Out of range •... -
Page 30: Troubleshooting Electric Expansion Valve
Make sure the piston is drawn up far enough into the motor assembly before reassembling. MASTER-BILT PART NUMBERS Use the chart below when ordering replacement parts for your Master-Bilt Master Controller 2.0 refrigeration system. Item Description... - Page 31 908 Highway 15 North New Albany, MS 38652 Service Dept. phone: 800-684-8988 Fax: 866-882-7629 Email: service@master-bilt.com Rev. 8-11...
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