McQuay AGZ090BS User Manual

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Installation, Operation and Maintenance Manual

IOMM AGZ-5

Group: Chiller

Part Number: 330411801

Effective: October 2004

Supercedes: IOMM AGZ-4

Air-Cooled Scroll Compressor Chiller

AGZ 026B through 130B

60 Hertz, R-22

Table of Contents

Questions and Answers:

T
Tina RayAug 17, 2025
What to do if the McQuay Chiller motor speed will not reach the target frequency?
- K
  Kevin OconnellAug 17, 2025
  If your McQuay Chiller motor speed isn't reaching the target frequency, consider these points: * If using the analog input, check the current or voltage at [O] or [OI]. Reduce the load, as heavy loads activate the overload restriction feature, which reduces output as needed. * Ensure the inverter isn't internally limiting the output frequency by checking the max frequency setting (A_04) and the frequency upper limit setting (A_61).
A
Angela WeissAug 21, 2025
Why is the direction of the McQuay Chiller motor reversed?
- E
  Emily CastilloAug 21, 2025
  If the direction of your McQuay Chiller motor is reversed, check the following: * Ensure the connections of output terminals [U/T1], [V/T2], and [W/T3] are correct according to the motor's phase sequence. Generally, FWD = U-V-W, and REV = U-W-V. * Verify that control terminals [FW] and [RW] are wired correctly, using terminal [FW] for forward and [RV] for reverse. Also, confirm that parameter F_04 is properly set to control motor direction.
B
Brandy IngramAug 26, 2025
What to do if the McQuay Chiller inverter data is not correct?
- J
  Julie Meyer MDAug 26, 2025
  If the inverter data for your McQuay Chiller is incorrect, consider these solutions: 1. If power was turned OFF after a parameter edit but before pressing the Store key, edit the data again and press the Store key. 2. Since edits to data are permanently stored at power down, ensure the time from power OFF to power ON is six seconds or more after editing data. Wait six seconds or more before turning power OFF. 3. If a download to the inverter was attempted, copy data to the inverter again, and keep power ON for six seconds or more after copying.
L
luisgilbertAug 28, 2025
Why doesn't the RPM of the McQuay Chiller motor match the inverter output frequency setting?
- C
  coopercrystalAug 29, 2025
  If the RPM of the McQuay Chiller motor doesn't match the inverter output frequency setting, verify the V/f settings match the motor specification and ensure all scaling (such as A_11 to A_14) is properly set. Also, check if the maximum frequency setting A_04 is correct and if the monitor function D_01 displays the expected output frequency.
L
laura19Sep 1, 2025
How to fix a McQuay AGZ090BS Chiller parameter that will not change after an edit?
- J
  Johnny SandovalSep 2, 2025
  If a parameter in your McQuay Chiller won't change after editing and reverts to the old setting, it may be because the inverter is in Run Mode. Some parameters cannot be edited during Run Mode. Put the inverter in Stop Mode (press the Stop/reset key) and then edit the parameter. Also, if you’re using the [SFT] intelligent input (software lock function), check the state of the SFT input and the B_31 parameter (SFT mode).

McQuay AGZ090BS Specifications

General

Model	AGZ090BS
Category	Chiller
Cooling Capacity	90 Tons
Refrigerant	R-410A
Compressor Type	Scroll
Number of Compressors	2
Voltage	460V

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