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Mars COMFORT-AIRE CMA18SD-1 User Manual

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INSTALLATION , OPERATION &
MAINTENANCE MANUAL
Horizontal/Side Discharge
Condensing Units
Models
CMA12SD-0
CMA18SD-1
CMA24SD-1
CMA30SD-1
CMA36SD-1
CMA48SD-1
517.787.2100 • www.marsdelivers.com
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Mars COMFORT-AIRE CMA18SD-1 Specifications

General IconGeneral
Tonnage1.5
BTU18000
Cooling Capacity (BTU/h)18000
Heating Capacity (BTU/h)18000
Phase1
RefrigerantR410A
Voltage (V)208-230

Summary

Safety Precautions

General Safety Warnings

Strict adherence to installation instructions, use of specified parts, and proper location are crucial.

Cautionary Safety Notes

Ensures proper grounding, avoids flammable gas areas, and mandates correct drainage piping.

Operating Instructions

Unit Operation Procedure

Steps for setting thermostat, fan switch, and general operating tips for optimal cooling.

Restarting Unit Safely

Wait at least 3 minutes after turning off before restarting to prevent damage.

Periodic Maintenance Guide

Instructions for cleaning indoor air filters and outdoor unit coils for optimal performance.

Product Alterations and Replacement Parts

Unauthorized alterations or parts void warranty and can create safety hazards.

General Product Information

Unpacking and Initial Inspection

Guidance on inspecting packages for damage upon arrival and filing claims.

Cooling Temperature Operating Limits

Specifies the optimal outdoor temperature range for cooling and warranty implications.

Indoor Unit Compatibility and Efficiency

Details compatibility with various indoor units and the importance of metering devices.

Thermostat and Fan Time Delay Requirements

Highlights the need for fan time delay and proper thermostat selection/placement.

Filter Drier Requirement

Mandates the use of an in-line filter drier, as it is not factory provided, to maintain warranty.

Outdoor Unit Installation

Outdoor Unit Location and Mounting

Guidance on selecting the optimal location and mounting the unit securely.

Clearances and Environmental Considerations

Ensuring proper airflow, protection from elements, and avoiding unit interference.

Required Clearances for Outdoor Unit

Specifies minimum clearances around the unit for air inlets, outlets, installation, and maintenance.

Anchoring the Outdoor Unit

Recommendations for anchoring the unit, especially in high wind or earthquake-prone areas.

Unit Wiring

Electrical Wiring and Supply Voltage Requirements

Details on adhering to NEC/local codes, providing branch circuits, and voltage consistency.

Outdoor Unit Wiring Connection Steps

Procedure for removing the cover, connecting cables, forming loops, and insulating conductors.

Wiring Connection Caution

Warning about potential malfunctions and the need for qualified electricians for all wiring.

Outdoor Unit Terminal Block Diagrams

Illustrations of terminal block connections for 12K and 18K-48K models.

Thermostat Wiring Note

Advises referring to thermostat instructions for additional wiring details.

12K Model Circuit Diagram

Detailed circuit diagram for the 12K model, showing component connections.

18K Model Circuit Diagram

Detailed circuit diagram for the 18K model, showing component connections.

Circuit Diagram Disclaimer

Disclaimer stating that diagrams are for reference and actual wiring prevails.

24K & 30K Model Circuit Diagrams

Circuit diagrams for 24K and 30K models, illustrating electrical connections.

36K Model Circuit Diagram

Detailed circuit diagram for the 36K model, showing component connections.

Circuit Diagram Note for 24K-36K

Note that diagrams are for reference only and actual wiring should be followed.

48K Model Circuit Diagram

Detailed circuit diagram for the 48K model, illustrating electrical connections.

Circuit Diagram Note for 48K

Note that diagrams are for reference only and actual wiring should be followed.

Refrigerant Piping

Refrigerant Piping Considerations

Discusses line length, bends, pressure drop, oil return, and tube sizing.

Refrigerant Piping Installation Practices

Guidance on tubing insulation, support, avoiding sags, noise transmission, and sharp edges.

Refrigerant Discharge Warning

Prohibits atmospheric discharge of refrigerant; service by qualified personnel only.

Leak Test, Evacuation & Release of Refrigerant

Refrigerant Charge Information

Unit comes with R-410a charge; additional charge needed for tubing.

Service Valve Operation

Service valves are shipped closed; do not open until leak testing and evacuation are complete.

Leak Test, Evacuation, and Release Procedure

Step-by-step guide for pressure testing, evacuation to 500 microns, and checking for leaks.

Initial Start-Up & Checks

Unit Operation Overview

Unit operation is automatic and depends on thermostat settings.

Pre-Operation Checks

Ensure all panels are installed, power is on, and thermostat is connected before operation.

System Start-Up Procedure

Steps for checking system components, fan operation, and initiating cooling.

Field Charging

Field Charging Importance

System performance depends on proper charge; operating conditions affect pressures.

Charging Requirements and Methods

Details on charging for tubing, metering devices, TXVs, and critical charging.

Charging Adjustment for Pipe Length

Provides a formula and table for calculating additional refrigerant based on pipe length.

Final Inspection

Final Inspection and Cleanup

Perform a final visual check, complete details, and clean the installation area.

Homeowner Unit Operation Review

Demonstrate unit operation to the homeowner/user and explain its functions.

Performance Verification Chart

Utilize the pressure/temperature chart to verify system performance against conditions.

Mars/Heat Controller Limited Express Warranty

One Year Parts Express Warranty

Warrants all parts against defects in workmanship and materials for one year.

Five Year Compressor Express Warranty

Warrants the compressor for five years total, covering four additional years after the first year.

Commercial Use Warranty

Specifies a one-year parts warranty for commercial, business, or rental applications.

Warranty Exclusions

Lists items not covered by the warranty, such as normal maintenance and labor charges.

Warranty Coverage Conditions

Outlines requirements for warranty coverage, including proper operation and installation.

Warranty Duration and Registration

Explains warranty start date based on purchase receipt and the need for proof.

Limited Warranty Remedy

States the sole remedy is replacement of defective parts; labor is not covered.

Limitation of Liability

Disclaims implied warranties and limits liability for consequential or incidental damages.

Obtaining Warranty Service or Parts

Instructions on how to contact for warranty claims and required documentation.

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