Daikin McQuay AWS210BDS

Questions and Answers

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Brenda StevensAug 18, 2025
Why is Daikin McQuay Chiller compressor overload tripped or circuit breaker tripping?
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  Christopher RobbinsAug 18, 2025
  If the Daikin McQuay Chiller compressor overload is tripped, the circuit breaker trips, or fuses are blown, it could be due to several reasons: * Low voltage during high load condition. Check the supply voltage for excessive voltage drop. * Loose power wiring. Check and tighten all connections. * A power line fault causing unbalanced voltage. Check the supply voltage. * Defective or grounded wiring in the motor. Check the motor and replace it if defective. * High discharge pressure. Refer to corrective steps for high discharge pressure.
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Kelly RichardsonAug 21, 2025
What causes high discharge pressure in Daikin McQuay Chiller?
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  Terrence BrockAug 21, 2025
  High discharge pressure in a Daikin McQuay Chiller can be caused by: * Noncondensables in the system. Remove them from the condenser coil after shutdown, following EPA regulations. * Fans not running. Check fan fuses and electrical circuits. * Fan control out of adjustment. Ensure the fan setup in the controller matches the unit fan number and check the Microtech III condenser pressure sensor for proper operation. * System overcharged with refrigerant. Check discharge superheat and condenser subcooling, and remove any excess charge. * Dirty condenser coil. Clean the condenser coil. * Air recirculation from the fan outlet into the unit coils. Remove the cause of recirculation. * Air restriction into the unit. Remove obstructions near the unit.
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Jeffery HoodAug 26, 2025
Why is Daikin McQuay Chiller compressor noisy or vibrating?
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  William PerezAug 26, 2025
  A noisy or vibrating Daikin McQuay Chiller compressor can stem from a few potential issues: * Inadequate oil injection. Verify that the oil sight glass shows visible oil during steady operation and check the pressure drop across the oil filter and oil separator sight glasses. * Liquid slugging. Check suction and discharge superheat.
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Victor PhillipsSep 1, 2025
How to troubleshoot Daikin McQuay AWS210BDS compressor that will not load or unload?
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  Deborah BullockSep 1, 2025
  To troubleshoot a Daikin McQuay Chiller compressor that won't load or unload: * Check the capacity control solenoids for proper operation. Refer to the capacity control section for detailed instructions.
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Susan DominguezSep 4, 2025
Why is the discharge pressure low in my Daikin McQuay AWS210BDS Chiller?
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  Natasha PhamSep 4, 2025
  Low discharge pressure in your Daikin McQuay Chiller could be due to: * Wind effect or a low ambient temperature. Protect the unit against excessive wind into vertical coils. * Incorrect condenser fan control. Ensure the fan setup in the Microtech III controller matches the unit fan number and check the VFD fan if the unit has a VFD option. * Low suction pressure. Refer to the corrective steps for low suction pressure. * The compressor operating unloaded. See the corrective steps for failure to load. * A compressor problem, such as the compressor not pumping properly. Repair or replace the compressor.
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Ryan MedinaSep 7, 2025
What causes low oil level trip in Daikin McQuay AWS210BDS?
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  Emily WellsSep 7, 2025
  A low oil level trip in a Daikin McQuay Chiller can be triggered by: * Insufficient oil. Check the oil line and separator sight glasses. * Low discharge pressure. Faulty EXV. * Low discharge superheat. Check and correct the cause of low DSH.
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Donna MacdonaldSep 12, 2025
What causes high suction pressure in Daikin McQuay Chiller?
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  Stephanie KelleySep 12, 2025
  High suction pressure in a Daikin McQuay Chiller can be caused by: * Excessive load - high water temperature. Reduce the load or add additional equipment. * Compressor unloaders not loading the compressor. Refer to corrective steps for failure of compressor to load. * Superheat is too low. Check the superheat on the Microtech III display and inspect the suction line sensor installation and the sensor itself. * System overcharged. Check the charge, as an overcharge raises suction pressure. * Compressor bypassing gas. Check evaporator, suction, and discharge pressures.
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Andrew FosterNov 14, 2025
What to do if Daikin McQuay Chiller compressor will not run?
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  Michael MaxwellNov 14, 2025
  If the Daikin McQuay Chiller compressor won't run, here's what to check: * Ensure the main power switch is closed. * Verify the unit system switch is closed by checking the MicroTech III display. * Confirm the circuit switch is not in the pumpdown position, also via the MicroTech III display, and check pump operation for flow. * Make sure the chilled water flow switch is closed, using the MicroTech display and checking the chilled water pump. * Close any open circuit breakers. * Inspect for blown fuses or tripped circuit breakers, checking for shorts, grounds, overloading, or loose connections. Reset breakers or replace fuses after fixing any faults. * Reset the compressor overload at the button and clear the alarm on the Microtech III display. * Check the compressor conta...
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alexander01Nov 27, 2025
What causes low suction pressure in Daikin McQuay Chiller?
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  James LarsonNov 28, 2025
  Low suction pressure in a Daikin McQuay Chiller can result from: * Inadequate refrigerant charge quantity. Check the liquid line sight glass for charge, inspect the unit for leaks, repair any leaks, and recharge the system to clear the sight glass at full load with all fans on and a minimum outdoor air temperature of 75°F. * A clogged liquid line filter-drier. Check the pressure drop across the filter-drier and replace it if necessary. * A malfunctioning expansion valve. Check the valve's superheat and opening position. Replace the valve only if you're certain it's not working. * Insufficient water flow to the evaporator. Check the water pressure drop across the evaporator and adjust the gallons per minute (GPM) accordingly. * Water temperature leaving the evaporator is too low....

Summary

Installation Manual

Hazard Identification

DANGER Warnings

Indicates a hazardous situation that will result in death or serious injury if not avoided.

WARNING Warnings

Indicates potentially hazardous situations that can result in property damage, severe personal injury, or death.

CAUTION Warnings

Indicates potentially hazardous situations which can result in personal injury or equipment damage.

Introduction

General Description of Pathfinder Chillers

Overview of Daikin McQuay Pathfinder™ air-cooled chillers, components, and features.

Remote Evaporator Models Overview

Information on AWS non-VFD and VFD models available as remote evaporator units.

Equipment Inspection Upon Arrival

Instructions for checking shipments for completeness and damage upon arrival.

Installation and Startup Procedures

Sharp Edge and Coil Safety

Warnings related to sharp edges and coil surfaces, and potential injury hazards.

Refrigerant Release Safety

Warnings about escaping refrigerant, suffocation hazards, and ignition sources.

Handling and Lifting Dangers

Dangers associated with improper lifting or moving of the unit, potential for severe injury or death.

Unit Location Requirements

Guidelines for locating the unit outdoors, considering proper airflow and prevailing winds.

Service Access Points

Description of locations for accessing components like compressors, filter-driers, and control panels.

Clearance Requirements for Unit Installation

Specifies minimum side and front clearances for proper unit operation, airflow, and maintenance.

Managing Restricted Air Flow

Features and considerations for units with restricted airflow due to site limitations like fences or walls.

Unit Placement: Building or Wall on One Side

Discusses hot air recirculation effects and placement recommendations for units near walls.

Unit Placement: Two Units Side By Side

Addresses performance adjustments when units are spaced closer than 12 feet apart.

Unit Placement: Three or More Units Side By Side

Details adjustment factors for inside units influenced by adjacent units on both sides.

Installation: Open Screening Walls

Design considerations for decorative screening walls to avoid performance adjustments.

Installation: Pit or Solid Wall Considerations

Addresses operating problems like recirculation and restriction in pit or solid wall installations.

Chilled Water Piping Design

Key requirements for chilled water piping design, including vibration eliminators, shutoff valves, and strainers.

Glycol Addition Caution

Caution regarding catastrophic evaporator failure if glycol is added without proper pump control or system drainage.

Optional Inlet Strainer Kit

Details on the available inlet water strainer kit, its components, and installation.

Installing the Optional Inlet Strainer

Instructions for mounting and connecting the optional inlet strainer kit to the evaporator.

System Water Volume Considerations

Guidance on ensuring adequate system water volume to prevent short cycling and maintain control.

Variable Speed Pumping Operation

Information on operating chillers with variable water flow, including change rates and limits.

Evaporator Freeze Protection Methods

Describes thermostat-controlled heaters and procedures for sub-freezing temperatures using glycol.

Chilled Water Flow Switch Requirements

Explains the necessity and installation of a flow switch to prove adequate water flow for unit startup.

Refrigerant Charge Information

Details on the operating charge for R-134a and where to find unit-specific data.

Glycol Solution Calculations and Performance

Explains how to calculate capacity, flow, and pressure drop when using glycol solutions.

Antifreeze Use Caution

Caution against using automotive grade antifreeze; industrial grade glycols must be used.

Performance Adjustment Factors for Fluid Temperature

Information on how leaving chilled fluid temperatures affect unit performance and the need for glycol.

Electrical Connections and Codes

Wiring requirements, compliance with codes, and power connection options (multi-point vs. single-point).

RapidRestore Option

Details on the RapidRestore option, which does not require field installation, but needs field-supplied inputs.

Physical Data for Standard Efficiency Non-VFD Models

Physical Data for Standard Efficiency VFD Models

Index of Lifting and Mounting Drawings

Lifting and Mounting Dimensions (Non-VFD)

Lifting and Mounting Dimensions (VFD)

Isolator Locations and Kit Numbers

Electrical Data and Field Wiring

Field Wiring Guidelines

General guidelines for field wiring, compliance with codes, and power connection types.

Evaporator Heater Safety Caution

Caution regarding de-energizing evaporator heaters to prevent burnout when the system is drained.

Compressor Rotation Safety

Warning about compressor damage if rotated in the wrong direction and proper phasing requirements.

Electrical Data Notes

Notes explaining field wiring designations, allowable voltage limits, and power limitations.

BAS Interface Modules

Information on optional BAS interface modules and where to find installation manuals.

Wiring Diagram

Multipoint Electrical Data (Standard Efficiency Non-VFD)

Multipoint Field Wiring Data (Standard Efficiency Non-VFD)

Terminal Amps (Non-VFD) Data

Single-point Electrical Data (Standard Efficiency Non-VFD)

Single-point Field Wiring Data (Standard Efficiency Non-VFD)

Single-point Field Wiring Data (High Efficiency Non-VFD)

Single-point Field Wiring Data (Premium Efficiency Non-VFD)

Single-point Electrical Data (High Efficiency VFD)

Multipoint Electrical Data (Standard Efficiency VFD)

Multipoint Electrical Data (Premium Efficiency VFD)

Multipoint Field Wiring Data (VFD)

Terminal Amps (VFD) Data

Single-point Electrical Data (Standard Efficiency VFD)

Single-point Field Wiring Data (VFD)

Evaporator Pressure Drop Data (Standard Efficiency)

Remote Evaporator Overview and Data

Refrigerant Specialties Kit Components

Components included in the kit for field installation of remote evaporators.

Remote Evaporator Performance Derate Data

Derating factors for remote evaporator performance due to field installed refrigerant line losses.

Remote Evaporator Derate Procedure

Step-by-step procedure for determining derate factors based on suction line pressure drop.

Remote Evaporator Field Wiring Notes

Notes on wiring 110V liquid line solenoid valves, temperature sensors, and pressure transducers.

Remote Evaporator Refrigerant Piping Design

Remote Evaporator Models and Dimensions

Remote Evaporator Unit Dimensions (Non-VFD)

Remote Evaporator Unit Dimensions (VFD)

Remote Evaporator Lifting and Mounting Weights (Imperial)

Remote Evaporator Spring Isolators (Aluminum Fin)

Remote Evaporator Lifting & Mounting Locations (Non-VFD)

Troubleshooting Chart

Troubleshooting: Compressor Not Running

Potential causes and corrective steps for a compressor that fails to start or run.

Troubleshooting: Noisy or Vibrating Compressor

Possible causes include internal compressor issues or oil injection problems.

Troubleshooting: Compressor Overload;Tripped Breakers;Blown Fuses

Addresses low voltage, wiring faults, unbalanced voltage, and high discharge pressure as causes.

Troubleshooting: Compressor Load;Unload Failure

Identifies defective capacity control solenoids or unloader mechanisms as potential issues.

Troubleshooting: High Discharge Pressure

Common causes include noncondensables, fan issues, overcharging, and dirty condenser coils.

Troubleshooting: Low Discharge Pressure

Addresses wind effect, fan control issues, low suction pressure, and unloaded compressor conditions.

Troubleshooting: Low Suction Pressure

Examines causes like inadequate refrigerant charge, clogged filter-drier, or low water flow.

Troubleshooting: Low Oil Level Trip

Identifies insufficient oil, low discharge pressure, or low discharge superheat as possible causes.

Troubleshooting: High Suction Pressure

Covers excessive load, compressor unloader issues, low superheat, and system overcharge.

Daikin McQuay Training and Development

Product Warranty Information