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McQuay TSC - User Manual

McQuay TSC
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Operating Manual
OM CentrifMicro II-5
Group: Chiller
Part Number: 331374901
Effective: March 2011
Supersedes: November 2010
MicroTech Ι
ΙΙ
ΙΙ
ΙΙ
Ι
Controller
With Starter Information
For Centrifugal Chillers and Templifiers
Models WSC, WDC, WCC, HSC, TSC
Software Version: WCFU3UU04C/D/E
OITS Version: 2.05.03

Table of Contents

Questions and Answers

  • T
    Tonya LittleAug 14, 2025
    Why does my McQuay TSC Controller motor not start?
    • N
      Nancy BassAug 15, 2025
      The motor may not start due to several reasons. There could be no control voltage; check the voltage input, fuses, and wiring. The start/stop control input wiring or voltage levels might be incorrect. The Control Source parameters (P4-5) might not be set correctly. There may be no line voltage detected because of an inline contactor, open disconnects, open fuses, open circuit breakers, or disconnected wiring. In rare cases, there may be a D3 control board problem; in this case, consult factory.
  • I
    Ian JonesAug 18, 2025
    What to do if my McQuay TSC Controller motor overheats?
    • K
      Kaitlyn AguilarAug 18, 2025
      If your motor overheats, it could be due to several reasons. The motor may be overloaded, so reduce the load. There might be too many starts per hour; in this case, increase the chiller LWT setpoint deadband. High ambient temperature can also cause overheating, so reduce the ambient temperature or improve cooling. If the acceleration time is too long, reduce the starting load. Finally, check for obstructions or damage to the motor cooling system; remove any obstructions and inspect the motor cooling fan.
  • P
    Peter ColemanAug 21, 2025
    What should I do if the McQuay TSC motor rotates in the wrong direction?
    • B
      Benjamin JohnsonAug 21, 2025
      If the motor rotates in the wrong direction, the phasing is likely incorrect. If the input phasing is correct, exchange any two output wires. If the input phasing is incorrect, exchange any two input wires.
  • C
    Catherine ButlerAug 25, 2025
    What to do if the McQuay TSC motor stops unexpectedly?
    • X
      xmolinaAug 25, 2025
      If the motor stops unexpectedly, it could be due to absent control voltage. Check the control voltage input, wiring, and fuses. In rare cases, there may be a D3 control board problem; in this case, consult McQuay Service.
  • A
    alanhernandezAug 27, 2025
    Why does my McQuay TSC motor rotate but not reach full speed?
    • M
      michael33Aug 27, 2025
      If the motor rotates but doesn't reach full speed during starting, it could be because the motor load is too high, or the current isn't dropping below 175% FLA, indicating the motor hasn't reached full speed. Try reducing the load on the motor during starting. Abnormally low line voltage or initial current that is too low can also be the cause. Fix the cause of the low line voltage or increase the initial current.
  • B
    Brian AcevedoAug 31, 2025
    What causes erratic operation of the McQuay Controller?
    • J
      Jill DavisAug 31, 2025
      Erratic operation can be caused by loose connections. Shut off all power and check all connections.
  • T
    Todd BuckleySep 3, 2025
    What to do if metering is incorrect on McQuay TSC Controller?
    • J
      Julia RandallSep 3, 2025
      Incorrect metering can stem from several causes. Loose connections may be the culprit; shut off all power and check all connections. Also, verify that the load is actually steady and that there are no mechanical issues. Other equipment on the same power feed may cause power fluctuations or distortion. Fix the cause of these power fluctuations or distortion.
  • D
    Dorothy GardnerSep 7, 2025
    How to troubleshoot a McQuay TSC remote keypad that doesn't operate correctly?
    • R
      Robert JohnstonSep 7, 2025
      If the remote keypad isn't operating correctly, first verify that the remote keypad cable hasn't been damaged and is properly seated at both the keypad and the D3 Control board. Also, check that the display interface board (if present) is firmly attached to the D3 control card. If these steps don't resolve the issue, the remote display may be damaged and require replacement.
  • M
    Matthew SmithSep 10, 2025
    What to do if the starter cooling fans on my McQuay Controller don't operate?
    • D
      Derrick HerreraSep 10, 2025
      If the starter cooling fans (when present) do not operate, verify the fan power supply and check the fuses. Also, check the fan wiring. If the power supply and wiring are good, the fan may have failed and needs to be replaced.

Summary

Features of the Control Panel

General Description

Component Description

Unit Controller

Compressor Controller

Field Wiring Diagram

Dual;Multi-Chiller Operation

Multiple Chiller Setup

Describes interconnecting up to four chillers via pLAN.

pLAN Setup

Details RS485 wiring and configuration for multi-chiller setup.

Communication Wiring

MicroTech II Operator Interface Touch Screen (OITS) Settings

Maximum Compressors ON

Sets the maximum number of compressors allowed to run.

Sequence and Staging

Defines the sequence in which compressors will start and stage.

Nominal Capacity

Sets the compressor design tons.

Operating Sequence

Operator Interface Touch Screen

SET Screens

Editing Setpoints

Details the process for accessing and changing setpoints.

Typical SETPOINT Screen

Procedure for Changing a Setpoint

Details the step-by-step process for modifying setpoint values.

Explanation of Setpoints

TIMERS

For setting timers like start-to-start, prelube, and postlube.

ALARMS

For setting limit and shutdown alarms.

VALVE

For tower bypass valve operation parameters.

TOWER

For cooling tower fan control and parameters.

MOTOR

For motor-related setpoints like amp limits.

MODES

For selecting operating modes and staging.

WATER

For leaving water temp, delta-T, and resets.

STARTER SETPOINTS

Optional Starter Setpoint Screen

Displays and allows setting of starter-specific parameters.

TIMERS Setpoint

TIMERS Setpoint Screen

Allows adjustment of various timing parameters for operation.

ALARMS Setpoint

ALARMS Setpoint Screen

Allows configuration of alarm limits and shutdown conditions.

Cooling Tower Bypass Valve Settings

Tower Bypass Valve Setpoint Screen

Configures parameters for the cooling tower bypass valve operation.

Cooling TOWER Fan Settings

Cooling TOWER Fan Setpoint Screen

Sets parameters for cooling tower fan staging based on temperature or lift.

Explaination of Tower Control Settings

Tower Fan Staging Only (NONE)

Configuration for tower fan staging without bypass valve or VFD control.

Tower Fan Staging With Bypass Valve Controlling Minimum EWT (VALVE SP)

TOWER SETPOINT Screen

Setpoints for tower fan staging with bypass valve controlling minimum EWT.

VALVE SETPOINT Screen

Setpoints for valve control in this mode.

Tower Staging with Bypass Valve Controlled by Fan Stage (VALVE STAGE)

Fan VFD, No Bypass Valve (VFD STAGE)

MOTOR Setpoint Screen

MOTOR Setpoint Screen

Configures motor parameters like FLA, speed, and limits.

MODES Setpoints

MODES Setpoint Screen

Selects operating modes, compressor staging, and control sources.

WATER Setpoints

WATER Setpoint Screen

Configures water temperature setpoints and reset parameters.

SERVICE Screen

Service Screen

Provides access to unit status, versions, and maintenance functions.

ACTIVE ALARM Screen

Active Alarms Screen

Displays current active alarms with date, time, and cause.

Fault Alarms

Problem Alarms

Warning Alarms

Set Screens

Unit and Compressor Setpoints

Configuration of unit and compressor parameters like mode, staging, and limits.

Alarm and Tower Setpoints

Configuration of alarm limits and cooling tower control settings.

View ALARM Screens

Active Alarm Screen

Shows currently active, uncleared alarms.

Editing Setpoints

Unit Controller Setpoints

Table 23, Unit Setpoints

Comprehensive list of unit controller setpoints, defaults, and ranges.

EXV Control Parameters

Set Compressor Setpoints

Staging Parameters

Absolute Capacity

Multiple Compressor Staging

Set Alarm Setpoints

Alarm Limit Settings

Set Tower Setpoints

Tower Control Setpoints

Alarms

Entering on the Unit Controller

FAULT

Entering on the OITS

Problem

Warning

Compressor Controller Setpoints

Set Compressor Setpoints

Table 24, Compressor Setpoints

Compressor Setpoints

Low Voltage Starters, 200 - 600 Volts

General

Wye-Delta Starter Overview

Solid State Starter Overview

Operation

Programming

Fault Log

Resetting Faults and Parameters

Emergency Thermal Reset

View and Set Parameters

Restoring Factory Parameter Settings

Faults and Alarms

Alarm Definitions

Troubleshooting

Fault Code

Voltage Faults (F21-F26)

Imbalance and Ground Faults (F37-F38)

Input and Control Faults (F48-F71)

Voltage and Phase Faults (F21-F28)

Phase and Line Faults (F27-F28)

Communication and CPU Faults (F81-F99)

Current and Overload Faults (F30-F34, F37-F38)

Current Faults (F30-F34)

Preventive Maintenance

During Commissioning

One Month After Commissioning

After First Month of Operation

Medium;High Voltage Starters, 2300 V - 7.2 KV

LED Display;Keypad Overview

View Parameters

Set Parameters

Menu Structure

Changing a Parameter

Quick Start

Motor FLA

Serv. Fact (Service Factor)

Start Mode

Stop Mode

Int. Curr. (initial current)

Max. Curr. (maximum current)

Ramp Time

Overload

Phase Order

Fault;Log Codes

Sequence of Operation

Unit Operation

Chiller Starting

Compressor Staging

Determining Full Load Status

Full Load Determination

Defines conditions for a compressor reaching full load status.

Operating the Chiller Control System

Start;Stop Unit

Operator Interface Panel (LOCAL)

Control Panel Switches

Change Setpoints

Component Failure

Chiller Operation without the Operator Interface Panel

Chiller Operation without the Unit Controller

Standby Power

Maintenance Schedule

I. Unit

Unit-specific maintenance tasks including logs and leak tests.

II. Compressor

Compressor maintenance tasks, including motor and lubrication.

III. Controls

Maintenance for operating and protective control systems.

Maintenance Schedule, Cont.

IV. Condenser

Condenser maintenance including tube cleaning and temp approach.

V. Evaporator

Evaporator maintenance including tube cleaning and temp approach.

VI. Expansion Valves

VII. Starter(s)

Starter inspection, overload verification, and electrical connection checks.

VIII. Optional Controls

McQuay TSC Specifications

General IconGeneral
BrandMcQuay
ModelTSC
CategoryController
LanguageEnglish

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