Master Bilt Master Controller 2.0 User Manual

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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

Table of Contents

Questions and Answers:

L
Lisa AndersonAug 14, 2025
What to do if I have high room temperature HITA in my Master Bilt Master 2.0?
- P
  Priscilla ThomasAug 14, 2025
  If you are experiencing high room temperature, it may be due to insufficient refrigeration or an oversized heat load. Check the system design to ensure it's sufficient for the application. Other potential causes include a failed compressor (replace if necessary), malfunctioning evaporator fans (fix them), a door left open for extended periods (keep the door closed), or coil icing (check for air leaks through the cold room walls).
L
Lucas HughesAug 17, 2025
What to do if my Master Bilt Master 2.0 displays a low pressure alarm LPRA?
- N
  Norma DavisAug 17, 2025
  If the controller shows a low-pressure alarm, it could be due to a refrigerant leak (fix the leak) or a faulty transducer (replace the pressure transducer).

Master Bilt Master Controller 2.0 Specifications

General

Brand	Master Bilt
Model	Master Controller 2.0
Category	Controller
Language	English

Summary

Important Notices

Warning Labels and Safety Instructions

Master Controller

Description

Features

Energy Saving Features

Electric Expansion Valve Modulation

Scheduled vs. Demand Defrost

Comparison of scheduled and demand defrost schemes for efficiency.

Reverse Cycle Defrost Technology

Description of the patented reverse cycle defrost control and its benefits.

Sequences of Operation

START UP

COOL MODE (REFR)

Normal cooling operation, modulating EEV based on superheat.

DEFROST MODE

Explanation of defrost modes, including scheduled and demand defrost criteria.

SAFETY MODE

System behavior during alarm conditions, covering sensor, defrost, and communication failures.

Multiple Evaporator Configuration

Alarm Display

Setting Parameters By On-Board Pushbuttons

User's Level

TECHNICIAN's Level

Clear Alarm

Manual Defrost

Temperature Sensors

Sensor Service Instructions

Sensor Tolerance Check

Pressure Transducer

Charging the Master Controller 2.0 Refrigeration System

Charging Procedures

Step-by-step instructions for charging the system with refrigerant.

How to Diagnose an Overcharged System

Reverse Cycle Defrost

General Information

Overview of the reverse cycle defrost feature and its purpose.

Advantages

Charging System with Reverse Cycle Defrost

Specific notes on charging a system with reverse cycle defrost.

Electric Wiring

Typical Wiring Diagram (Air Defrost)

Typical Wiring Diagram (Reverse Cycle Defrost)

Typical Wiring Diagram (Electric Defrost)

Typical Set Points for AMC Controller 2.0

Troubleshooting Guide

Troubleshooting the Electric Expansion Valve