Heatcraft BOHN MAC8X User Manual

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

Heatcraft BOHN MAC8X Specifications

General

Brand	Heatcraft
Model	BOHN MAC8X
Category	Heat Pump
Language	English

Summary

Condensing Unit Placement

Space and Location Requirements

Details essential considerations for air-cooled equipment placement and noise reduction.

Refrigeration Piping

Suction Lines

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

Leak Detection and Evacuation

Leak Detection

Procedures for pressurizing and leak testing the system using various methods.

Evacuation

Detailed steps for evacuating the system to achieve a deep vacuum for proper operation.

Field Wiring

Beacon II Controller Installation

Installation Tips

Guidance on wire gauge, transformer taps, and sensor handling for Beacon II installation.

Beacon II Controller Operation

Refrigerant Line Brazing (CAUTION)

Precautions for brazing refrigerant lines to protect sensitive components.

Initial Power On

Describes system behavior upon initial power application and hold-off cycles.

Power Supply

Instructions for connecting and verifying the 24 VAC power supply for the Beacon II board.

Wiring

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

Beacon II Controller Settings

Refrigerant Charging

Procedures for charging refrigerant using head pressure control and sight glass.

Start-Up Operation

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

Beacon II Controller Programming

Programming And Reviewing Settings/Changes

How to use the PROGRAM REVIEW button to change system settings.

Programming And Reviewing Settings/Changes (continued)

Detailed explanation of programming items like Defrost Type, Refrigerant Type, and Superheat.

Beacon II Controller System States

Status Indicator LED (continued)

Details error codes (E1-E9) and other codes (Loc, UnL) displayed by the LED.

Pumpdown

Explains the automatic and manual pumpdown procedures for the system.

Beacon II Controller Modes

Service Mode

How to place the system into service mode using a switch or the controller.

Beacon II Controller Alarms and Errors

Alarms

Error Indicator LED

Beacon II Controller Features

Checking Sensors

Beacon II Controller Expansion Valve

Checking Operation Of Expansion Valve (EEV)

Steps to check if the expansion valve is closing properly and monitor its position.

Expansion Valve Motor Winding Resistance

Initialization of Beacon II Smart Controller

INITIALIZATION STEPS

Step-by-step guide for initializing the Beacon II Smart Controller system.

Programming Smart Controller

PROGRAMMING SMART CONTROLLER

Instructions for changing setpoint items using PROGRAM REVIEW and SETPOINT slide-bar.

Monitoring Smart Controller

MONITORING SMART CONTROLLER

Locking Beacon II Smart Controller

LOCKING BEACON II SMART CONTROLLER

ERROR CODES

WIRING ERROR

Alarm Codes

Alarm Codes

Operational Checkout

Check-Out & Start-Up

Points to cover before placing the system in operation after installation.

Diagnostics

LED is not lit.

Troubleshooting steps for when the LED display is not lit.

E7 Compressor Shutdown

Troubleshooting steps for compressor shutdown due to safety controls like LPS or HPS.

Cannot get to box temperature

Troubleshooting steps when the system fails to reach the desired box temperature.

LED shows Coo, but compressor will not run.

Troubleshooting steps when the compressor does not run despite the 'Coo' display.

Placing system into SERVICE MODE

ERROR CODES: El - E5 Outdoor Sensor

Terminating SERVICE MODE

E6 Low Superheat During Cooling

Troubleshooting steps for low superheat conditions during cooling.

Startup Checklist

SYSTEM CHECKS

Wiring Diagrams

Diagram 1. Low Profile Evaporator Wiring

Diagram 2. MAC Unit Wiring

Diagram 3. 24 Volt Connection Wiring with Smart Controller