Danfoss TTS700

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®

Service Manual - Revision H



Danfoss Turbocor® Twin-Turbine

Centrifugal Series Compressors



TT Series Compressors

http://turbocor.danfoss.com |

Table of Contents

Other manuals for Danfoss TTS700

Applications And Installation Manual114 pages

Questions and Answers:

D
David DouglasAug 15, 2025
What to do if there is a High Discharge Temperature Fault in my Danfoss TTS700 Air Compressor?
- J
  Janet DavisAug 15, 2025
  A high discharge temperature fault in the Danfoss Air Compressor often suggests insufficient charge (low gas), increased condenser temperature, a check valve that hasn't opened, or the compressor running in surge condition for too long. To address this, check the chiller gas charge, the conditions of the air/water entering the condenser, and the operational settings. Also, make sure the discharge pressure/temperature sensor is working correctly and that the check valve opens during compressor operation.
W
warrenandrewAug 18, 2025
What to do if there is a Low Suction Pressure Fault in my Danfoss Air Compressor?
- A
  anthony71Aug 19, 2025
  A Low Suction Pressure Fault in your Danfoss Air Compressor suggests there may be insufficient charge, insufficient system load, or a sudden drop in evaporator entering air/water temperature or flow. You should check the charge, system load, and entering air/water conditions to resolve this issue.
M
Mary DavisAug 21, 2025
What to do if I see a High Inverter Temperature Fault on my Danfoss TTS700?
- J
  jbradleyAug 21, 2025
  A High Inverter Temperature Fault in your Danfoss Air Compressor indicates that the inverter cooling is not sufficient. Ensure that the liquid motor-cooling line has enough liquid supply and is not blocked. To prevent Inverter failure, avoid running the compressor for long periods at a pressure ratio less than 1.5. If the fault occurs three times in 30 minutes, a Lock-Out Fault will occur. In this case, allow the measured Inverter temperature to drop below the Maximum Drive Startup Temperature before attempting a restart.
T
Terri HallAug 25, 2025
What causes a High Discharge Pressure Fault in a Danfoss TTS700?
- H
  Heather RodriguezAug 25, 2025
  A High Discharge Pressure Fault in your Danfoss Air Compressor suggests that the condenser may be faulty or there's insufficient air/water flow. You should check the condenser and air/water flow. Also review the fault log for the actual discharge pressure and other conditions recorded at the time of the fault.
P
Paula GutierrezAug 27, 2025
What causes a 3-Phase Over-Current Fault in a Danfoss Air Compressor?
- A
  April MccoyAug 27, 2025
  A 3-Phase Over-Current Fault in your Danfoss Air Compressor means the compressor is drawing more current than the 3-Phase Current Fault Limit. Review the fault log for the recorded 3-Phase Current level, demand, entering air/water temperature (if available), and other conditions recorded at the time of the fault. This fault can also be related to a start speed or minimum pressure ratio that is set too high at start-up, a power control integral gain that is too high, or a sudden increase in load/demand or system changes.
L
Lauren CooleyAug 30, 2025
What causes a High Cavity Temperature Fault in my Danfoss Air Compressor?
- A
  Andrew HardyAug 30, 2025
  A High Cavity Temperature Fault in your Danfoss Air Compressor indicates that the motor cooling is insufficient. Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked. To prevent shaft demagnetization or Back EMF is low faults, avoid running the compressor for long periods at a pressure ratio less than 1.5.
J
Jessica VillanuevaSep 2, 2025
What causes a High Pressure Ratio Fault in my Danfoss TTS700?
- J
  Justin GravesSep 2, 2025
  A High Pressure Ratio Fault in your Danfoss Air Compressor suggests the condenser pressure is high, there is not enough load on the evaporator, or there is insufficient water/air flow in either the condenser or evaporator. Check the electronic expansion valve (EXV) operation, condenser and evaporator loads, and water/air flow.
K
Kimberly RaymondSep 5, 2025
What does a Low Leaving Fluid Temperature Fault mean on my Danfoss Air Compressor?
- G
  garnercraigSep 5, 2025
  A Low Leaving Fluid Temperature Fault in your Danfoss Air Compressor suggests there is insufficient evaporator fluid flow or insufficient system load. Check the evaporator fluid flow and system load. Also, verify the leaving fluid temperature sensor.
J
Jonathon CaldwellSep 8, 2025
What causes a High SCR Temperature Fault in my Danfoss TTS700?
- S
  Sarah PerrySep 8, 2025
  A High SCR Temperature Fault in your Danfoss Air Compressor indicates that the SCR cooling is insufficient. Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
O
odavisSep 12, 2025
What does a Sensor Fault mean on my Danfoss TTS700 Air Compressor?
- T
  taylorsarahSep 12, 2025
  A Sensor Fault in your Danfoss Air Compressor may be caused by values out of the specified ranges. Review the fault log for any such indications recorded at the time of the fault. Verify the questionable sensor and related connections to check for failure. Also, verify the suction pressure/temperature sensor.

Danfoss TTS700 Specifications

General

Brand	Danfoss
Model	TTS700
Category	Air Compressor
Language	English

Summary

Chapter 1.0 Introduction

1.5 Safety Summary

Alerts service personnel to safety information regarding hazards and qualified personnel.

1.8 Electrical Isolation

Details steps to isolate compressor power to safely service the unit.

Chapter 3.0 Compressor Removal and Installation

3.1 Refrigerant Containment

Details safety precautions and procedures for refrigerant isolation and recovery.

3.3 Compressor Installation

Outlines the procedure for installing a new compressor, including torque specifications.

Chapter 4.0 Component Identification

4.14 Soft Start

4.18 Silicone-Controlled Rectifier

4.22 Inverter

Details the inverter's function in generating AC output voltage for the compressor motor.

4.29 Magnetic Bearings

Chapter 5.0 Troubleshooting

5.1 Alarm and Fault Indications

Explains how alarms and faults indicate compressor operating conditions and issues.

5.2 Troubleshooting with the Service Monitoring Tools Software

5.3 Bearing Calibration

Chapter 6.0 Maintenance

6.1 Preventative Maintenance Tasks

Appendix B Compressor Troubleshooting Flowcharts

Figure B-1 Compressor Operation Troubleshooting Flowchart (Sheet 1)

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