Hussmann Krack MS Series

Questions and Answers

A
Andrew JacksonAug 6, 2025
What to do if the fans will not operate on my Hussmann Accessories?
- K
  Kaitlyn ReynoldsAug 6, 2025
  If the fans on your Hussmann Accessories unit aren't working, the issue could stem from several causes. First, check the wiring to ensure it's properly connected. If the wiring is correct, the motor itself might be defective and need replacement. Alternatively, a faulty defrost timer, termination thermostat, or fan delay switch could be the culprit, requiring replacement of the specific defective component. Lastly, if the room temperature is too high, try jumpering the fan delay switch by connecting terminals F to B.
J
John MolinaAug 12, 2025
Why is there excessive buildup of frost on the coil of my Hussmann Krack MS Accessories?
- E
  Elizabeth BeckAug 12, 2025
  Excessive frost buildup on the coil of your Hussmann Accessories unit can be due to several reasons. It could be that the defrost cycles are too infrequent; try adding more defrost cycles to the timer. Alternatively, the defrost cycle might be too short, in which case you should extend the defrost time on the timer. High humidity in the cooler can also contribute; limit access to the cooler and avoid propping doors open during stocking.
D
dreeseAug 20, 2025
Why is ice forming on the ceiling of my Hussmann Krack MS?
- T
  Thomas Martinez Jr.Aug 20, 2025
  If you notice ice forming on the ceiling of your Hussmann Accessories, it could be due to having too many defrost cycles per day. Observe the frost buildup on the coil and adjust to fewer defrost cycles per day. It may also be steaming during defrost, in this case replace the defective component.
M
Mindy WilliamsAug 27, 2025
What to do if there is accumulation of ice in drain pan of my Hussmann Accessories?
- J
  Jeffrey MeadowsAug 27, 2025
  If you find ice accumulating in the drain pan of your Hussmann Accessories, there are a couple of likely causes. The drain line might be plugged, so try cleaning it out. Alternatively, the heater could be defective and need replacement.

Summary

Safety and General Information

Safety Definitions and PPE

Defines safety terms (Danger, Warning, Caution) and specifies required Personal Protection Equipment.

Environmental Concerns and Compliance

Discusses responsible refrigerant handling and state-specific requirements.

Unit Information and Models

Model Identification

Explains the model number coding system for MS Series unit coolers.

Unit Dimensions and Diagram

Equipment Receipt and Component Assembly

Equipment Receipt and Inspection

Instructions for checking equipment upon delivery for damage or shortages.

Component Assembly

Covers installation of loose parts like long throw adapters and distributor nozzles.

Expansion Valve Installation

Details the procedure for installing the expansion valve and connecting the equalizer tube.

Check Valve Installation

Rigging, Unit Location, and Mounting

Rigging and Lifting Guidelines

Guidelines for safely moving and lifting the unit, emphasizing proper support.

Unit Placement and Mounting Procedures

Specifies optimal placement for air circulation and mounting procedures.

Piping Installation

Drain Line Installation and Setup

Instructions for installing the drain line, including pitching, traps, and heating.

Refrigeration Piping Guidelines

Covers system design, codes, and piping techniques for refrigeration lines.

Multi-Unit Piping Configurations

Evacuation, Leak Testing, and Gas Defrost Piping

Refrigerant Distributor Nozzle Installation

Information on selecting and installing distributor nozzles for even refrigerant distribution.

Electrical Systems and Data

Field Wiring and Grounding Requirements

Guidelines for field wiring, compliance with codes, and grounding requirements.

Motor Electrical Specifications

Provides electrical data (amps) for different motor types and fan quantities.

Defrost Operation Sequences

Air Defrost Sequence

Describes the normal operation and frost melting process for air defrost.

Electric Defrost Sequence

Gas Defrost Cycle Operation

Dual Speed Motor Fan Control

Variable Speed Motor Control

System 450 Controller Parameters

Defines parameters for the System 450 controller, including setpoint and endpoint.

Unit Interlocking and Control

Compressor and Fan Interlocking

Describes interlocking the evaporator fans with a single compressor unit.

System Startup and Checks

Pre-Startup Inspection Checklist

Lists essential checks before placing the unit into operation.

Operation and Voltage Verification

Details how to verify system voltage, phase balance, and thermostat settings.

Preventative Maintenance Schedule

Drain Pan Cleaning and Inspection

Instructions for inspecting and cleaning the drain pan to ensure proper drainage.

Coil and Cabinet Cleaning Procedures

Procedures for cleaning the coil, fan cabinet, and fans to maintain performance.

Fan Guard and Motor Replacement

Electric Defrost Heater Replacement

Instructions for replacing electric defrost heaters on the coil face and drain pan.

Troubleshooting and Parts Information

Unit Troubleshooting Guide

Lists common problems, possible causes, and corrective actions for unit operation.

Major Replacement Parts Identification

Identifies major replacement parts with their corresponding BOM part numbers.