Vertiv Liebert MCL165 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 MCL165

Installer/User Guide94 pages

Questions and Answers:

W
wnunezAug 5, 2025
How to troubleshoot Vertiv Liebert MCL165 condenser that will not start?
- J
  Jonathan LevineAug 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.
S
Sarah PriceAug 8, 2025
What to do if SPD green and red LEDs are extinguished on Vertiv Liebert MCL165 Heat Pump?
- T
  Trevor OwenAug 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.
A
alecmunozAug 13, 2025
Why is there high discharge pressure in my Vertiv Liebert MCL165 Heat Pump?
- T
  Thomas WagnerAug 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.
D
dylanariasAug 17, 2025
What to do if Vertiv Liebert MCL165 Control Board LEDs do not light?
- X
  xgarciaAug 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.
J
Jermaine SandovalAug 22, 2025
What does it mean if SPD red LED is illuminated on Vertiv Liebert MCL165?
- W
  williamsshaneAug 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.
M
Monica DrakeAug 27, 2025
Why Vertiv Heat Pump fan will not run?
- D
  Diane GomezAug 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.
J
Jonathan LawsonAug 30, 2025
What causes low discharge pressure in Vertiv Heat Pump?
- L
  lovekristenAug 31, 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 MCL165 Specifications

General

Brand	Vertiv
Model	Liebert MCL165
Category	Heat Pump
Language	English

Summary

Important Safety Guidelines

Risk of Improper Handling, Installation, and Service

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

Arc Flash and Electric Shock Hazard

Warning about arc flash and electric shock during electrical work.

Risk of Contact with High-Speed, Rotating Fan Blades

Warning regarding serious personal injury or death from fan blade contact.

Risk of Electrical Fire and Short Circuit

Warning about property damage, injury, or death from electrical fires.

Risk of Electric Shock

Warning about potential injury or death from electric shock.

Risk of Heavy Condenser Falling or Tipping Over

Warning about property damage, injury, or death from unit instability.

Risk of Explosive Discharge of High-Pressure Gas

Caution regarding injury from explosive gas discharge.

1 Introduction

1.3 Liebert Lee-Temp™ Refrigerant Control

Explanation of the Liebert Lee-Temp system for refrigerant control.

2 Site Preparation

2.2 Dimensions and Weights

Specifications on unit dimensions and weights for planning.

3 Inspection and Installation

3.2 Handling Unit on the Skid

3.4 Unpacking the Condenser—All Unit Sizes

3.5 Preparing a Condenser for Moving and Installation

Procedure for preparing the condenser for movement and installation.

3.6 Mounting the Condenser

Guidelines for securely mounting the condenser unit.

3.6.2 Seismic-Certified and Wind-Certified Mounting Requirements

4 Electrical Connections

4.1 Line Voltage Wiring

Instructions for connecting the line voltage electrical service.

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

Details on low-voltage wiring for CANbus and interlock connections.

5 Piping

5.2 Field Piping Guidelines

5.3 Refrigerant Planning Values

Approximate refrigerant charge values for system planning.

5.3.1 Recommended Refrigerant Line Sizes

5.7 System Charging with Liebert MC

Procedures for charging the Liebert MC system with refrigerant.

7 Initial Startup Checks and Commissioning

7.1 Startup Checklist

7.2 Initial Startup

Steps for performing the initial startup of the condenser unit.

8 Troubleshooting

9 Control Operation

9.1 Premium Efficiency Control Board and Interface

9.2 Premium Efficiency Condenser Alarm Codes

Information on alarm codes displayed by the condenser.

10 Liebert Seismic Application— Optional Unit Configuration

10.1 Seismic Anchoring Considerations

Key considerations for seismic anchoring of the unit.

11 System Maintenance

11.2 Condenser Cleaning

Instructions and guidelines for cleaning the condenser coil.

11.3 Fan Replacement

Procedures for replacing the condenser fan.

11.4 Premium Efficiency Control Board Replacement

Instructions for replacing the control board.

11.4.1 Replacement Preparation

11.4.2 Installation

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