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Vertiv Liebert MC series - User Manual

Vertiv Liebert MC series
127 pages
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Liebert® MC™
60-Hz Air-cooled MicrochannelCondenser
-Premium/EC Fan
Installer/User Guide

Table of Contents

Other manuals for Vertiv Liebert MC series

Preview: Installer/User Guide
Installer/User Guide94 pages

Questions and Answers

  • T
    Travis TurnerAug 1, 2025
    How to troubleshoot Vertiv Liebert MC condenser that will not start?
    • S
      srodriguezAug 1, 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.
  • S
    Sandra ScottAug 5, 2025
    What to do if SPD green and red LEDs are extinguished on Vertiv Heat Pump?
    • B
      Brittany BlakeAug 5, 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.
  • S
    Sharon WillisAug 9, 2025
    Why is there high discharge pressure in my Vertiv Heat Pump?
    • C
      Charles SerranoAug 9, 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.
  • L
    Lisa HendersonAug 13, 2025
    What to do if Vertiv Liebert MC Heat Pump Control Board LEDs do not light?
    • M
      melissawilliamsAug 14, 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
    Melinda LeeAug 17, 2025
    What does it mean if SPD red LED is illuminated on Vertiv Heat Pump?
    • C
      Christopher RamirezAug 17, 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.
  • I
    ibarkerAug 22, 2025
    Why Vertiv Heat Pump fan will not run?
    • M
      Michelle CochranAug 22, 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.
  • R
    Robert RomanAug 27, 2025
    What causes low discharge pressure in Vertiv Liebert MC?
    • J
      Jamie HallAug 27, 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.

Summary

Important Safety Guidelines

Inspection and Installation

Equipment Inspection

Handling Unit on Skid

Unpacking the Condenser

Preparing for Moving and Installation

Attaching Longer Legs and Rigging

Condenser Mounting

Guidelines for securely mounting the condenser to the installation surface.

Electrical Connections

Line Voltage Wiring

Instructions for connecting the main power supply to the condenser.

Wye vs. Delta Power Supply

Low-Voltage Control Wiring

Details on connecting CANbus and interlock wiring between units.

Electrical Field Connection Descriptions

Piping

Piping Guidelines

General recommendations for installing refrigeration piping.

Field Piping Guidelines

DX System & MC Condenser Piping

DSE & Premium MC Condenser Piping

Refrigerant Planning Values

Recommended Refrigerant Line Sizes

System Charging

Steps for charging the system with refrigerant.

Checklist for Completed Installation

Moving and Placing Equipment

Electrical Checklist

Checklist items for electrical connections and service.

Piping Checklist

Checklist items for refrigeration piping installation.

Initial Startup Checks and Commissioning

Startup Checklist

Initial Startup Procedure

Procedure for the first startup and operation of the condenser.

Troubleshooting

Control Operation

Control Board and Interface

Overview of the control board and its interface components.

Condenser Alarm Codes

Explains the alarm codes displayed by the control system.

Active Alarms Menu Description

History Alarms Menu Description

Liebert Seismic Application-Optional Unit Configuration

Seismic Anchoring Considerations

Requirements for securing the unit to withstand seismic forces.

Seismic Piping Considerations

Guidelines for seismic-compatible piping installation.

Seismic Wiring Considerations

Guidelines for seismic-compatible wiring installation.

System Maintenance

General Maintenance Procedures

Condenser Cleaning

Fan Replacement

Steps for replacing the condenser fan units.

Verify Fan Address

Control Board Replacement

Steps to prepare for replacing the control board.

Control Board Installation

Vertiv Liebert MC series Specifications

General IconGeneral
BrandVertiv
ModelLiebert MC series
CategoryHeat Pump
LanguageEnglish

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