Daikin McQuay AWS350BDS - User Manual

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Installation Manual IM 1167

Pathfinder

®

Air Cooled Chillers

Group: Chillers

Part Number:

IM 1167

REV

00

Date: December, 2012

© 2012 McQuay International

Model AWS-B (Rev 0B)

•

Standard, High, & Premium Efficiencies



Includes models with VFD and models with Remote Evaporator

170 to 550 tons • 600 to 1930 kW • R-134a • 60Hz

Table of Contents

Questions and Answers

K
Kristen CollinsAug 18, 2025
Why is Daikin McQuay AWS350BDS compressor overload tripped or circuit breaker tripping?
- R
  Ruben TurnerAug 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.
T
Timothy CooperAug 21, 2025
What causes high discharge pressure in Daikin McQuay AWS350BDS?
- K
  Kathryn FordAug 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.
M
madison39Aug 25, 2025
Why is Daikin McQuay AWS350BDS compressor noisy or vibrating?
- N
  nicole89Aug 25, 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.
P
pyoungAug 30, 2025
How to troubleshoot Daikin McQuay AWS350BDS compressor that will not load or unload?
- L
  Lindsay HarrisAug 30, 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.
K
kimaguilarSep 3, 2025
Why is the discharge pressure low in my Daikin McQuay AWS350BDS?
- M
  Mr. Erik BarnesSep 3, 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.
J
Jennifer PetersSep 6, 2025
What causes low oil level trip in Daikin McQuay Chiller?
- C
  Christopher CalderonSep 6, 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.
K
Keith NewtonSep 10, 2025
What causes high suction pressure in Daikin McQuay AWS350BDS Chiller?
- C
  cobbsarahSep 10, 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.
G
Garrett HarrisNov 13, 2025
What to do if Daikin McQuay Chiller compressor will not run?
- A
  Anthony BauerNov 13, 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...
K
katiechenNov 27, 2025
What causes low suction pressure in Daikin McQuay AWS350BDS?
- A
  Ashley HoweNov 27, 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 and Startup

Unit Handling and Safety

Instructions for safe lifting, moving, and avoiding unit damage.

Unit Location Considerations

Clearance Requirements

Specifies minimum clearances for unit installation and service access.

Chilled Water Piping Design

Electrical Connections

Covers wiring requirements, local codes, and power connection options.

Electrical Data

Field Wiring Guidelines

Covers wiring compliance, power connection options, and wire sizing.

Remote Evaporator Information

Remote Evaporator Field Wiring Notes

Refrigerant Piping Design

Guidelines for designing refrigerant piping for proper operation and oil return.

Performance Derate Data

Lifting & Mounting Locations (non-VFD)

Lifting & Mounting Locations (VFD)

Troubleshooting Chart

Compressor Troubleshooting

Addresses issues like compressor not running, noise, vibration, or overload.

Pressure Troubleshooting

Covers high and low discharge/suction pressure issues and their causes.

Daikin McQuay AWS350BDS Specifications

General

Tons	350
Type	Air-Cooled Screw Chiller
Refrigerant	R-134a
Compressor Type	Screw
Weight	5200 kg

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