Vertiv Liebert MCL220 User Manual

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Liebert® MC™

60-Hz Air-cooled MicrochannelCondenser

-Premium/EC Fan

Installer/User Guide

Table of Contents

Other manuals for Vertiv Liebert MCL220

Installer/User Guide94 pages

Questions and Answers:

T
Tracy RamosAug 5, 2025
How to troubleshoot Vertiv Liebert MCL220 condenser that will not start?
- M
  Michael AtkinsonAug 5, 2025
  If the Vertiv Heat Pump condenser won't start, first check the voltage at the input terminal block to ensure there is power. If power is present, check if the circuit breaker or fuse for the low voltage transformer in the condenser has tripped; if so, locate and repair the problem within the condenser's electrical panel. Finally, verify that there is a low voltage signal to or from the indoor unit; if not, locate and repair any open circuits.
D
David EatonAug 9, 2025
What to do if SPD green and red LEDs are extinguished on Vertiv Liebert MCL220?
- L
  lindabuchananAug 9, 2025
  If the green and red LEDs on your Vertiv Heat Pump's SPD are extinguished, begin by checking the voltage at the input terminal block to ensure proper voltage and phasing at the condenser. Next, inspect the electrical connections to the SPD for any faults and repair them. Finally, ensure that the condenser disconnect switch is in the On position and recheck the lights.
J
Jon RobertsAug 13, 2025
Why is there high discharge pressure in my Vertiv Liebert MCL220?
- J
  Jeffrey AlvarezAug 13, 2025
  High discharge pressure in your Vertiv Heat Pump can be caused by several factors. Begin by cleaning the condenser coil fins. Also, check if the condenser fans are operating and verify the low voltage signal from the indoor unit and check the fan motors and fuses. Finally, check the refrigerant charge, as a high charge can also cause this issue.
E
Erica JohnsonAug 18, 2025
What to do if Vertiv Liebert MCL220 Heat Pump Control Board LEDs do not light?
- J
  Jennifer NicholsAug 18, 2025
  If the control board LEDs on your Vertiv Heat Pump do not light up, check the connection to P24 to ensure it is securely connected. Also, check the connector from the transformer for loose terminals. Verify that the fuses next to P24 have not blown, and replace them if needed. Use a voltmeter to confirm that the output from the transformer is 24Vac ±10%, ensuring the correct primary leads are used. If there is no output voltage, verify that the primary connections are secure and receiving the correct voltage. If they are, replace the transformer.
M
Mr. Daniel Bryant MDAug 21, 2025
What does it mean if SPD red LED is illuminated on Vertiv Liebert MCL220?
- A
  Antonio WhiteAug 22, 2025
  If the red LED is illuminated on the SPD of your Vertiv Heat Pump, it indicates that a surge exceeding the SPD's rating has occurred. Replace the SPD and inspect other components for damage, replacing them as necessary.
R
Robert CastroAug 27, 2025
Why Vertiv Heat Pump fan will not run?
- M
  Mr. Michael McdanielAug 27, 2025
  If the fan on your Vertiv Heat Pump will not run, ensure that a jumper is installed between 24V and DIN1, specifically for Ziehl-Abegg fan motors. Install the jumper if it is missing.
D
Diana BrownAug 30, 2025
What causes low discharge pressure in Vertiv Heat Pump?
- W
  William ReyesAug 30, 2025
  Low discharge pressure in a Vertiv Heat Pump can be due to a faulty head pressure control valve or premium efficiency control board. If either is defective, replace it.

Vertiv Liebert MCL220 Specifications

General

Brand	Vertiv
Model	Liebert MCL220
Category	Heat Pump
Language	English

Summary

Important Safety Guidelines

Handling, Installation, and Service Hazards

Warning about potential damage, injury, or death from improper handling.

Electrical Shock and Arc Flash Dangers

Warning about arc flash and electric shock hazards in electrical enclosures.

Fan Blade and Hot Surface Hazards

Warning about injury from rotating fan blades and burns from hot surfaces.

Gas Discharge and Sharp Edge Hazards

Warning about explosive gas discharge and injury from sharp edges.

Refrigerant Charging and Storage Notices

Inspection and Installation

Unit Storage and Unpacking

Mounting the Condenser

Guidelines for securely mounting the condenser to its final location.

Seismic and Wind-Certified Mounting

Electrical Connections

Electrical Safety Warnings

Warning about electrical shock hazards in fan and control enclosures.

Line Voltage Wiring

Instructions for connecting the line voltage supply to the condenser.

Low-Voltage Control Wiring

Electrical Field Connection Descriptions

Piping

Piping Installation Warnings

Warnings about refrigerant discharge, rupture, and overpressurization risks.

General Piping Guidelines

Field Piping Guidelines

Instructions for installing refrigerant lines and connecting to indoor units/condensers.

Refrigerant Planning Values

Recommended Refrigerant Line Sizes

System Charging Procedures

Procedures for charging the refrigerant system.

Checklist for Completed Installation

Electrical Checklist Items

Piping Checklist Items

Initial Startup Checks and Commissioning

Startup Checklist Verification

Initial Startup Procedure

Step-by-step guide for the initial startup of the condenser unit.

Troubleshooting

Common Symptoms and Solutions

Troubleshooting guide for common symptoms and their solutions.

Control Operation

Premium Efficiency Control Board and Interface

Condenser Alarm Codes

Details alarm codes displayed on the control board for diagnostics.

Liebert Seismic Application

Seismic Anchoring Considerations

Details requirements for seismic anchoring of the condenser.

Seismic Piping Considerations

Seismic Wiring Considerations

System Maintenance

Condenser Coil Cleaning

Fan Replacement Procedure

Control Board Replacement

Preventive Maintenance Checklist

Air-Cooled Condenser Maintenance Checks

Liebert MC Condenser Maintenance Checks

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