Vertiv Liebert MCM080 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 MCM080

Installer/User Guide94 pages

Questions and Answers:

W
wsimonAug 4, 2025
How to troubleshoot Vertiv Liebert MCM080 Heat Pump condenser that will not start?
- T
  Teresa ChapmanAug 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.
T
Tracy GonzalesAug 9, 2025
What to do if SPD green and red LEDs are extinguished on Vertiv Heat Pump?
- W
  Wendy DayAug 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.
V
Veronica Freeman DDSAug 13, 2025
Why is there high discharge pressure in my Vertiv Liebert MCM080?
- A
  Austin FletcherAug 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.
M
Mary KochAug 17, 2025
What to do if Vertiv Liebert MCM080 Control Board LEDs do not light?
- S
  Shelby FisherAug 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.
H
Haley RosalesAug 22, 2025
What does it mean if SPD red LED is illuminated on Vertiv Heat Pump?
- R
  Robin KramerAug 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.
V
valerieelliottAug 26, 2025
Why Vertiv Heat Pump fan will not run?
- J
  Janet RobbinsAug 26, 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.
S
Shane YoungAug 30, 2025
What causes low discharge pressure in Vertiv Liebert MCM080 Heat Pump?
- J
  Jonathan SanchezAug 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 MCM080 Specifications

General

Brand	Vertiv
Model	Liebert MCM080
Category	Heat Pump
Language	English

Summary

Important Safety Guidelines

2 Site Preparation

2.1 Site Considerations

Provides essential guidelines for choosing an optimal installation location.

2.2 Dimensions and Weights

2.2.1 Condenser and Options Net Weights

3 Inspection and Installation

3.6 Mounting the Condenser

Guidelines for securely mounting the condenser to the installation surface.

3.6.1 Standard Mounting Requirements

Specifies standard requirements for condenser mounting and anchoring.

3.6.2 Seismic-Certified and Wind-Certified Mounting Requirements

Details requirements for seismic and wind-certified mounting applications.

4 Electrical Connections

4.1 Line Voltage Wiring

Details on connecting the main power supply to the condenser unit.

4.2 Low-voltage Control Wiring—CANbus Communication and Interlock Connections

Guides for CANbus communication and interlock wiring between units.

4.2.1 Electrical Field Connection Descriptions

Describes specific electrical connection points and their functions.

5 Piping

5.1 Piping Guidelines

General guidelines for installing refrigerant piping, including brazing and material.

5.2 Field Piping Guidelines

Specific guidelines for field-installed refrigerant piping.

5.2.1 Field Piping Guidelines for a Liebert DX System and Liebert MC Condenser

5.2.2 Field Piping Guidelines for a Liebert DSE and Liebert Premium MC Condenser

5.7 System Charging with Liebert MC

Detailed steps for charging the refrigerant system.

5.7.1 Liebert MC Charging, Units with Liebert Lee-Temp Receivers

Charging procedures for units with Liebert Lee-Temp receivers.

5.7.2 Liebert MC Condenser Charging with Liebert DSE Receivers

Charging procedures for units with Liebert DSE receivers.

5.7.3 Liebert MC Charging, Premium Efficiency Control, Units without Receivers

Charging procedures for units without receivers.

6 Checklist for Completed Installation

6.2 Electrical

Checks electrical connections, wiring, and grounding for compliance and safety.

6.3 Piping

7 Initial Startup Checks and Commissioning

7.1 Startup Checklist

A pre-startup checklist to ensure all installation requirements are met.

7.2 Initial Startup

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

8 Troubleshooting

9 Control Operation

9.1 Premium Efficiency Control Board and Interface

9.2 Premium Efficiency Condenser Alarm Codes

10 LIEBERT SEISMIC APPLICATION— OPTIONAL UNIT CONFIGURATION

10.1 Seismic Anchoring Considerations

Covers requirements for seismic anchoring, including hardware and load data.

11 SYSTEM MAINTENANCE

11.2 Condenser Cleaning

Instructions for cleaning the condenser coils to maintain efficiency.

11.2.3 How to Clean the Condenser Coil

11.3 Fan Replacement

11.4 Premium Efficiency Control Board Replacement

12 PREVENTIVE MAINTENANCE CHECKLIST

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