Vertiv Liebert MCS028 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 MCS028

Installer/User Guide94 pages

Questions and Answers:

J
Jessica TaylorAug 5, 2025
How to troubleshoot Vertiv Liebert MCS028 Heat Pump condenser that will not start?
- K
  Kristin HernandezAug 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.
J
jcruzAug 9, 2025
What to do if SPD green and red LEDs are extinguished on Vertiv Liebert MCS028 Heat Pump?
- B
  Beth TaylorAug 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.
M
Mindy MccarthyAug 13, 2025
Why is there high discharge pressure in my Vertiv Heat Pump?
- J
  Joseph FisherAug 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.
J
Juan AustinAug 18, 2025
What to do if Vertiv Liebert MCS028 Control Board LEDs do not light?
- C
  Cynthia ParkerAug 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
Megan GonzalezAug 22, 2025
What does it mean if SPD red LED is illuminated on Vertiv Heat Pump?
- J
  Jonathan MontgomeryAug 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.
B
Bianca MillsAug 27, 2025
Why Vertiv Liebert MCS028 fan will not run?
- J
  Jesse GriffithAug 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.
S
Sheila BowmanAug 31, 2025
What causes low discharge pressure in Vertiv Liebert MCS028 Heat Pump?
- M
  michaelgarciaAug 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 MCS028 Specifications

General

Brand	Vertiv
Model	Liebert MCS028
Category	Heat Pump
Language	English

Summary

IMPORTANT SAFETY GUIDELINES

3 INSPECTION AND INSTALLATION

3.2 Handling Unit on the Skid

Instructions for safely moving and handling the unit using a forklift or crane.

3.6 Mounting the Condenser

Requirements for securely mounting the condenser to the installation surface.

4 ELECTRICAL CONNECTIONS

4.1 Line Voltage Wiring

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

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

Details on connecting CANbus and interlock wiring for system communication.

5 PIPING

5.1 Piping Guidelines

Best practices and requirements for installing refrigerant piping.

5.3 Refrigerant Planning Values

Approximate refrigerant charge requirements for system planning.

7 INITIAL STARTUP CHECKS AND COMMISSIONING

7.2 Initial Startup

8 TROUBLESHOOTING

9 CONTROL OPERATION

9.1 Premium Efficiency Control Board and Interface

9.2 Premium Efficiency Condenser Alarm Codes

11 SYSTEM MAINTENANCE

11.2 Condenser Cleaning

11.3 Fan Replacement

11.4 Premium Efficiency Control Board Replacement

12 PREVENTIVE MAINTENANCE CHECKLIST

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