The Master Controller Reverse Cycle Defrost 2.0 Systems
Interested in a system that prevents product loss and saves significantly on your energy bill?
Maintaining proper, consistent temperature in a walk-in is vital for protecting perishable items. However, when evaporator coils are blocked due to ice build-up, they lose the ability to transfer heat properly. Temperatures in a refrigerated space can then rise, resulting in spoilage.
Cold Controlled:
The Master Controller Reverse Cycle Defrost (MCRCD) system is an optional electronic controller for Master-Bilt walk-in cooler and freezer refrigeration systems. It completely removes frost build-up in coils and works much faster than electric defrost heaters. Its patented design also saves up to 27% more energy than an all-mechanical system.
The MCRCD system is highly efficient since it regulates an electric expansion valve in response to evaporator superheat and return air temperature. Standard Demand Defrost technology initiates reverse cycle defrosts only as needed, allowing further energy savings.
MCRCD is part of a Master-Bilt refrigeration system which also includes a remote condensing unit, multi-compressor unit or parallel rack unit and one or more evaporator coils.
Reverse Cycle Defrost:
This patented process reverses the direction of refrigerant flow during defrost reducing defrost energy usage by up to 80%. Defrost time is also greatly lessened. The average time using defrost heaters is 20-30 minutes. Reverse cycle can perform a completely “clean” defrost in as little as 3 to 5 minutes in a freezer or 1-1/2 to 2 minutes in a cooler.
Web2Walk-In™:
The Web2Walk-In software loaded on each controller allows you to remotely monitor and program all data and setpoints using any wireless device, including PC, Mac, smartphone or tablet, or one using a cabled (cat 5) connection (internet connection not required for controller operation).
With Web2Walk-In, there’s no need for a service tech to climb onto a roof or enter the walk-in to monitor or adjust the refrigeration system. Plus, constant access to data allows users to improve refrigeration system performance and avoid service issues.
Features and Benefits:
1) Web2Walk-In internet software:
● Allows remote communications, setting changes, firmware updates, alarms via email or text message and system status monitoring. XML-based so special software not required. May be accessed using any device with a wireless internet or cabled (cat 5) connection
2) Evaporator fan cycling:
● Saves energy by cycling the evaporator fans during compressor off cycle.
3) Floating head pressure:
● Takes advantage of low air temperatures to reduce the amount of work for the compressor by allowing the head pressure to vary with outdoor conditions. This reduces compressor load and energy consumption and can extend compressor life.
4) Electronic expansion valve:
● Increased efficiency over mechanical thermostatic expansion valve. Electronic expansion valve is modulated by evaporator superheat and return air pressure and does not rely on less efficient refrigerant pressure drop.
5) Three temperature sensors:
● Accurate measurement of suction temperature, air temperature and coil temperature
6) Alternating runtime of two refrigeration systems:
● Allows more energy efficient use of refrigeration systems by reducing the number of stops/starts
7) Demand defrost technology:
● Saves energy since system only defrosts as necessary
8) System settings are password protected:
● Added security
9) Super Controller board:
● A simpler board available for multi-evaporator systems to reduce overall cost
10) Peer-to-peer control:
● Refrigeration and defrost can be synched together between several controllers (formerly master/slave set-up)
11) Standard alarm functions:
● Alert the user to potential problems with high temperature, low temperature, sensors, low pressure, communications or superheat
12) Data logging:
● Provides five days of room and coil temperature history to help diagnose service issues
13) Four digit readout and six button overlay:
● Ease of set-up and menu surfing
14) “Potted” control board:
● The control board is mounted to the plastic housing and encased with liquid polymer to protect from moisture and physical damage
15) Compatibility with most previous Master Controller versions:
● Can be used as an upgrade to an existing system or field replacement. The 2.0 version uses same expansion valve, temperature sensors and pressure transducer and fits on the same spot on the evaporator coil.