Vertiv Liebert PFD - User Manual

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Liebert®

PFD™ Prop Fan Digital Condensing Unit

ThermalManagementSystems

Installer/User Guide

Table of Contents

Questions and Answers

W
wilsonlauraAug 19, 2025
Why is my Vertiv Liebert PFD compressor motor protectors tripping or cycling?
- B
  Beth WolfeAug 19, 2025
  If the compressor motor protectors are tripping or cycling in your Vertiv Heat Pump, it could be due to several reasons: * High discharge pressure: Check for a blocked condenser fan or coil. * High suction temperature: Check the expansion valve and hot gas bypass valve setting and the liquid quenching valve operation. * Loose wiring: Check all power and control circuit connections to ensure they are secure. * Defective motor: Check for a motor ground or short; if either is found, replace the compressor.
D
Dr. Elizabeth WilliamsAug 22, 2025
What causes high discharge pressure in a Vertiv Liebert PFD Heat Pump?
- J
  Jason CarpenterAug 22, 2025
  High discharge pressure in your Vertiv Heat Pump can be caused by: * Insufficient airflow across the condenser coil. Check the fan operation and remove any debris from the coil and air inlets. * High refrigerant charge. You should check the refrigerant charge.
E
Elizabeth FaulknerAug 26, 2025
What to do if Vertiv Liebert PFD Heat Pump compressor cycles on locked rotor?
- J
  Jennifer FordAug 26, 2025
  If the compressor in your Vertiv Heat Pump cycles on a locked rotor, it could be due to a few issues. First, check the line voltage and determine the location of any voltage drop. Also, the compressor motor might be defective, so check for a motor winding short or ground. Single phasing can also cause this issue; check the voltage across all 3 legs at the contactor and correct the source of the problem.
O
orrcraigAug 28, 2025
Why is my Vertiv Liebert PFD Heat Pump compressor noisy?
- H
  Hannah DicksonAug 28, 2025
  A noisy compressor in your Vertiv Heat Pump can be caused by: * Loose compressor or piping supports. Tighten the clamps. * Compressor rotation in reverse direction. Check for proper power phase wiring to the unit and to the compressor motor.
D
Darlene HernandezAug 31, 2025
What causes low suction pressure or compressor cycling in Vertiv Heat Pump?
- P
  petermooreAug 31, 2025
  Low suction pressure or compressor cycling in your Vertiv Heat Pump can be attributed to several factors: * Insufficient refrigerant in the system: Check for leaks, repair them, and add refrigerant. * Plugged filter drier: Replace the filter drier. * Improper superheat adjustment: Reset the expansion valve for 10-15°F (5.6 to 8.4°C) superheat at the evaporator. * Defective liquid line solenoid valve: Check the valve and coil; replace if necessary.
T
thughesSep 3, 2025
What causes low compressor capacity or no cooling in Vertiv Liebert PFD?
- S
  sarahjacksonSep 3, 2025
  If your Vertiv Heat Pump has low compressor capacity or is not cooling, consider these potential causes: * Defective liquid line solenoid valve: Check the valve and coil; replace if necessary. * Plugged filter drier: Check the pressure drop across the filter drier and replace it if needed. * Low refrigerant charge: Check for normal system operating pressures, refer to abnormal pressure causes if applicable, and check for leaks. Proper refrigerant charge is very important at low ambient operation.
M
Michelle MillerSep 6, 2025
What causes low discharge pressure in Vertiv Heat Pump?
- L
  Lee JohnsonSep 6, 2025
  Low discharge pressure in your Vertiv Heat Pump can be caused by: * A faulty head pressure control valve. If defective, replace it. * Compressor rotation in the reverse direction. Check for proper power phase wiring to the unit and to the compressor motor.
R
Rachel BaileySep 9, 2025
Why is my Vertiv Heat Pump compressor running hot?
- J
  Jennifer JenkinsSep 9, 2025
  If your Vertiv Heat Pump's compressor is running hot, it could be due to a compression ratio that is too high. Check for normal system operating pressures and refer to abnormal pressure causes if applicable.
J
jennifer99Sep 12, 2025
What causes pipe rattle in Vertiv Liebert PFD Heat Pump?
- I
  Ian Jones DDSSep 12, 2025
  Pipe rattle in your Vertiv Heat Pump is caused by loose pipe connections. Check the pipe connections and supports.
C
christopher94Nov 15, 2025
What to do if my Vertiv Heat Pump unit will not start?
- V
  Vanessa DayNov 15, 2025
  If your Vertiv Heat Pump unit won't start, there could be several reasons. First, check the voltage at the input terminal block to ensure the unit is receiving power. If there is no power, resolve this first. If power is present, then the compressor contactor might not be pulling in. Check for 24 VAC ±2 VAC at control connections 1 & 2. If there is voltage, check 24 VAC at control connections 3 and 6. If there is voltage, then there is compressor high discharge pressure situation. The compressor will attempt to start once the high-pressure situation has resolved. Also check 24 VAC at control connections 5 and 6. If there is no voltage, then there is high discharge temperature situation. The compressor will attempt to start once the high-temperature situation has resolved and minimum 30 min...

Summary

Important Safety Instructions

General Safety Warnings and Precautions

Crucial safety warnings regarding electrical hazards, pressure, rotating parts, and sharp edges.

Pre-installation Preparation and Guidelines

Outdoor Condensing Unit Location Considerations

Equipment Inspection and Handling Procedures

Instructions for inspecting and safely handling the PFD unit upon arrival.

Piping and Refrigerant Requirements

Refrigerant Piping Guidelines

Requirements and best practices for installing refrigerant piping.

Air-Cooled Refrigerant Piping Guidelines

Piping for Vertical Condensing Unit Placement

Refrigerant Line Sizing and Equivalent Lengths

Table for selecting correct refrigerant line sizes based on equivalent length.

Refrigerant Charge Calculation

Steps and tables for calculating the required refrigerant charge.

Additional Oil Requirements for Digital-scroll Compressors

Electrical Connection Requirements

Checklist for Completed Installation

Pre-Installation Checklist Items

A comprehensive list of items to verify before unit operation.

Initial Start-up and Commissioning for Warranty

Warranty Inspection Check Sheet Procedures

Steps for completing and submitting the warranty inspection check sheet.

Summary

Important Safety Instructions

General Safety Warnings and Precautions

Crucial safety warnings regarding electrical hazards, pressure, rotating parts, and sharp edges.

Pre-installation Preparation and Guidelines

Outdoor Condensing Unit Location Considerations

Equipment Inspection and Handling Procedures

Instructions for inspecting and safely handling the PFD unit upon arrival.

Piping and Refrigerant Requirements

Refrigerant Piping Guidelines

Requirements and best practices for installing refrigerant piping.

Air-Cooled Refrigerant Piping Guidelines

Piping for Vertical Condensing Unit Placement

Refrigerant Line Sizing and Equivalent Lengths

Table for selecting correct refrigerant line sizes based on equivalent length.

Refrigerant Charge Calculation

Steps and tables for calculating the required refrigerant charge.

Additional Oil Requirements for Digital-scroll Compressors

Electrical Connection Requirements

Checklist for Completed Installation

Pre-Installation Checklist Items

A comprehensive list of items to verify before unit operation.

Initial Start-up and Commissioning for Warranty

Warranty Inspection Check Sheet Procedures

Steps for completing and submitting the warranty inspection check sheet.

Vertiv Liebert PFD Specifications

General

Brand	Vertiv
Model	Liebert PFD
Category	Heat Pump
Language	English

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