Heatcraft Mohave User Manual (English)

Questions and Answers:

M
Mrs. Carrie TuckerSep 12, 2025
Why is there uneven coil frosting on my Heatcraft Industrial Equipment?
- L
  ldillonSep 12, 2025
  If you notice uneven coil frosting on your Heatcraft Industrial Equipment, it might be located too close to a door or opening; consider relocating the evaporator. The defrost termination setting might be set too low, so adjust it higher. An incorrect or missing distributor nozzle can also cause this, so add or replace the nozzle with one appropriately sized for the conditions.
C
Caitlin MoranSep 13, 2025
Why is my Heatcraft Industrial Equipment compressor losing oil?
- C
  Cheryl LoganSep 13, 2025
  If your Heatcraft Industrial Equipment's compressor is losing oil, it could be due to a lack of refrigerant; check for leaks, repair them, and add refrigerant. Excessive compression ring blow by can also cause this, potentially requiring compressor replacement. Refrigerant flood back can lead to oil loss, so maintain proper superheat at the compressor. Finally, improper piping or traps can be a factor, so correct the piping.
N
Natalie JohnsonSep 14, 2025
What causes low suction pressure in Heatcraft Industrial Equipment?

Heatcraft Mohave Specifications

General

Brand	Heatcraft
Model	Mohave
Category	Industrial Equipment
Language	English

Summary

Mohave Hot Gas Defrost Installation & Operation

Controller Quick Reference Guide

Controller Operation and Modes

Details on controller buttons, operating modes, and service switch functionality.

Program and Monitor Menus

Navigating menus for programming settings and monitoring system values.

Safety, Inspection, and Warranty

General Safety Information

Essential safety precautions, inspection procedures, and warranty terms for the equipment.

System and Components Overview

Condensing and Evaporator Unit Features

Description of standard and optional features for both condensing and evaporator units.

Unit Cooler Installation

Placement, Clearances, and Condensate Drains

Guidelines for unit cooler placement, clearances, and condensate drain line installation.

Condensing Unit Installation

Location, Rigging, and Mounting

Requirements for condensing unit location, rigging, mounting methods, and access for service.

Refrigerant Piping Practices

Recommended Piping and Support

Best practices for refrigerant piping installation, including slope, traps, and proper support techniques.

Unit Cooler Piping Sizing

Calculating Line Sizes and Examples

Methodology for determining line sizes, including examples and fitting allowances.

Line Sizing Tables

Recommended Line Sizes

Tables providing recommended suction and liquid line sizes for various refrigerants and conditions.

Optional Controls and System Features

Control Options Overview

Details on dual valve systems, ambient fan cycle, phase loss monitors, and evaporator power options.

Demand Cooling System Explained

Explanation and design considerations for the Copeland Demand Cooling system.

Wiring Installation Procedures

Field Wiring, General Installation, and Modbus

Guidelines for field wiring, general installation, and Modbus communication setup.

Wiring Diagrams

Interconnection Wiring (Single/Dual Evaporator)

Diagrams for 24V interconnection wiring for single and dual evaporator systems.

Typical Evaporator Wiring

Wiring diagrams for evaporators with electric drain pan heaters and hot gas drain pans.

Condensing Unit Wiring (208-230V & 460V)

Wiring diagrams for condensing units and control boards across different voltage configurations.

Factory Piping Diagrams

Unit Cooler and Condensing Unit Piping

Diagrams illustrating typical factory piping configurations for unit coolers and condensing units.

Refrigeration Operation

System Operation, Fan Control, and Pump Down

Explanation of refrigeration cycle, solenoid control, fan operation, and pump down sequences.

Defrost Operation Details

Defrost Process, Termination, and Skip Logic

Details on defrost stages, programming, termination parameters, and skip logic.

Evacuation, Leak Detection, and Insulation

System Evacuation and Leak Testing

Procedures for proper system evacuation, leak testing, and line insulation to ensure system integrity.

Start-Up, Program Review, and Settings

Initial Start-Up and Mode Display

Steps for initial system start-up, power-on sequence, and understanding operating modes.

System Parameter Programming

How to review and change system settings via the program review menus.

Monitoring Operation Values

Reviewing System Status and Controller Functions

Using controller buttons to monitor values, forced outputs, and system status indicators.

Error and Alarm Details

System Alarms, Errors, and Contingencies

Comprehensive list of system alarms, error codes, and associated contingency actions for troubleshooting.

Refrigerant Charging Procedures

Charging Instructions and System Configurations

Guidelines for refrigerant charging, including capacity calculations and system configuration recommendations.

Operational Check Out and Superheat Adjustment

System Checks and Superheat Balancing

Procedures for operational check out, system balancing, and adjusting compressor/evaporator superheat.

Refrigeration Oils and Properties

Polyol Ester Lubricants and Oil Level

Information on polyol ester lubricants, their hygroscopicity, and proper oil level management.

Troubleshooting Guides

Controller, Sensor, and System Issues

Charts for diagnosing issues with controllers, sensors, system pressures, and component failures.

Evaporator and General System Problems

Common evaporator symptoms and general system issues with possible causes and corrective steps.

Preventive Maintenance Schedules

Unit Cooler and Condensing Unit Tasks

Recommended maintenance schedules and tasks for unit coolers and air-cooled condensing units.

Service Parts List

Electrical and Piping Components

List of replacement parts, including electrical components and piping parts with part numbers.

Factory Default Settings

Control Parameter Defaults

Tables detailing default settings for fan cycles, defrost parameters, and pressure controls.

Control Board Comparison

First vs. Second Generation Boards

Comparison of features and differences between Mohave control board generations.

Pressure Regulator Comparison

Alco vs. Carel Regulator Identification

Pictorial guide to identify Alco and Carel electronic pressure regulators.

Modbus Communication Definitions

Modbus Data Registers, Commands, and Errors

Definitions for Modbus inputs, coils, registers, commands, errors, and operating modes.

Heatcraft Mohave User Manual

Table of Contents