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Heatcraft BOHN MAC Series User Manual

Heatcraft BOHN MAC Series
52 pages
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Installation and Operation Manual
MAC Series
Condensing Units
Replaces H-IM-67H (01/18)
TABLE of CONTENTS
General safety and inspection
Condensing unit specications ............................... 2
Evaporator unit specications ................................. 3
Evaporator placement ............................................. 4
Condensing Unit placement.....................................5
Refrigerant piping and line sizes ..........................6-8
Leak detection and evacuation ................................ 9
Field wiring ........................................................... 10
Beacon II Controller
Installation .......................................................... 11
Refrigerant line brazing
Power supply
Wiring ................................................................ 12
Box temp control settings
Refrigerant charging
Start-up operation ............................................... 13
Initial power on
Operating mode display ..................................... 14
Program & review settings/changes ..............15-18
Low ambient operation
Pumpdown ....................................................19-20
Defrost ................................................................ 20
Alarms and error indicator LED ........................ 21
Evaporator fans shut down by operators
Power failure
Space sensor terminal
Checking sensors ............................................... 22
System defaults
Control sensor and piping .................................. 23
Checking operation of exp. valve
Exp. valve motor winding resistance ................. 24
Smart Controller ............................................25-36
Operational checkout ......................................... 37
Preventive maintenance ................................38-40
Diagnostics .......................................................41-44
Beacon II parts lists ..........................................45-46
Startup Checklist .............................................. 47-48
Wiring diagrams ...............................................49-51
Warranty information ............................................ 52
H-IM-67H March 2018 Part #25006401
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Heatcraft BOHN MAC Series Specifications

General IconGeneral
ApplicationCommercial
Heating CapacityVaries by model
Voltage208/230V, 460V, 575V
SEER RatingNot applicable (Commercial Refrigeration)
HSPF RatingNot applicable (Commercial Refrigeration)
Sound LevelVaries by model (Consult product data sheet)
Dimensions (H x W x D)Varies by model (Consult product data sheet)
WeightVaries by model (Consult product data sheet)

Summary

General Safety Information

Inspection

Responsibility for material receipt and checking for concealed damage.

Condensing Unit Specifications

Evaporator Unit Specifications

Evaporator Placement

Condensing Unit Placement

Refrigeration Piping And Line Sizing

Refrigeration Piping

Suction Lines

Guidelines for sloping and insulating suction lines for proper oil return.

Suction Line Risers

Recommendations for installing suction line traps to ensure oil return.

Condensate Drain Lines

Proper installation and protection of condensate drain lines to prevent freezing and ensure drainage.

Line Insulation

Leak Detection And Evacuation

Field Wiring

Beacon II Board Overview

Identification of key components and terminals on the Beacon II control board.

Beacon II Controller Installation

Installation Tips

Guidance on wiring, sensor handling, and system setup for the Beacon II controller.

Beacon II Controller Setup

Refrigerant Line Brazing

Precautions for brazing refrigerant lines to protect electronic components.

Power Supply

Details on connecting the 24 VAC power supply and voltage requirements for the Beacon II.

Wiring

Guidelines for high and low voltage wiring between condensing and evaporator units.

Beacon II Controller Operations

Box Temperature Control Settings

How to adjust room thermostat settings and understand temperature differentials.

Refrigerant Charging

Procedure for charging the system with refrigerant using sight glass.

Start-Up Operation

Checks for wiring, time delay relay, and low pressure switch settings.

Beacon II Controller Modes

Initial Power On

System behavior and hold-off cycles upon initial power application.

Operating Mode Display

Understanding the LED display codes for system modes and status.

Beacon II Controller Programming

Programming And Reviewing Settings/Changes

How to access and modify system parameters using the PROGRAM REVIEW button.

Beacon II Controller Settings

Programming And Reviewing Settings/Changes (continued)

Detailed explanations of various programmable settings like defrost, alarms, and units.

Beacon II Controller Interface

Controller Buttons Functions

Explains the functionality of MONITOR, FORCE DEFROST, RESET TIME, and FORCE SERVICE buttons.

Beacon II Controller Status

CLEAR/TEST Button and Status Indicator LED

How to use CLEAR/TEST button and interpret LED status and error codes.

Beacon II Controller Faults

Status Indicator LED Error Codes

Details on error codes (E1-E9) and their meanings for system faults.

Pumpdown Operation

Explanation of system pumpdown cycles and manual pumpdown procedures.

Beacon II Controller Modes

Service Mode

How to place the system into service mode and its effects on operation.

Defrost Operations

Details on defrost timing, delay, electric, and air defrost modes.

Beacon II Controller Alarms

Alarms and Alarm Codes

Information on alarm contacts, conditions, and specific alarm codes (A1-A4).

Error Indicator LED

Explanation of system errors (E1-E7, E9) indicated by the LED.

Beacon II Controller Features

Evaporator Fan Control and Power Failures

How to shut down evaporator fans and system behavior during power failures.

Spare Sensor Terminals and Checking Sensors

Using spare terminals and testing sensor functionality and resistance.

Beacon II Controller Configuration

System Defaults

Default settings for R-404A refrigerant type and various control parameters.

Control Sensor And Piping

A diagram illustrating the typical system layout for sensors and piping.

Beacon II Controller Maintenance

Checking Expansion Valve Operation

Procedures to verify EEV closing, position monitoring, and pressure response.

Expansion Valve Motor Winding Resistance

How to measure motor winding resistance for suspected EEV malfunction.

Beacon II Smart Controller Introduction

Beacon II Smart Controller Features

Beacon II Smart Controller Interface

Beacon II Smart Controller Installation

Smart Controller Wiring and Power

Beacon II Smart Controller Initialization

Programming Smart Controller

Monitoring Smart Controller

Locking Beacon II Smart Controller

Alarm Codes

Smart Defrost

Grounding

Operational Checkout

Preventive Maintenance Introduction

Preventive Maintenance

Condensing Unit Checks

Quarterly and semi-annual inspection checklist for condensing units.

Preventive Maintenance

Unit Cooler Checks

Quarterly and semi-annual inspection checklist for unit coolers.

Diagnostics

Troubleshooting Common Issues

Steps for diagnosing problems like no LED, no compressor run, and low superheat.

Diagnostics

Troubleshooting Compressor Shutdown

Actions for diagnosing compressor shutdown due to LPS, HPS, OPS, or PLM trips.

Diagnostics

Troubleshooting Communication and Display Errors

Diagnosing multi-out/multi-in wiring errors and low voltage display issues.

Diagnostics

Troubleshooting Box Temperature Issues

Steps to diagnose problems where the unit fails to reach the box temperature.

Placing and Terminating Service Mode

Procedures for entering and exiting the system's service mode.

Parts Lists

Condensing Unit Parts List

List of part numbers for various components of the condensing unit.

Evaporator Parts List

List of part numbers for various components of the evaporator unit.

Smart Controller Parts and Limits

Smart Controller Parts List and Operational Limits

List of parts and operational parameters for the Beacon II Smart Controller.

Startup Checklist

Startup Checklist Data Record

Wiring Diagrams

Low Profile Evaporator Wiring

Wiring diagram for air defrost and electric defrost low profile evaporators.

Wiring Diagrams

MAC Unit Wiring Diagram

Wiring diagram for the MAC condensing unit, including component labels.

Wiring Diagrams

24 Volt Connection Wiring with Smart Controller

Wiring diagram for connecting the Smart Controller to evaporator units.

Warranty Information

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