McQuay ACZ 055A Operations Instructions

Installation and Maintenance Manual IMM ACZ/AGZ-4 Group: Chiller Part Number: 331374201 Effective: October 2006 Supersedes: August 2006 Air-Cool

Case 4, Open Screening Walls Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop. These walls should be

Case 5, Pit/Solid Wall Installation Pit installations can cause operating problems and great care should be exercised if they are to be used on an ins

Sound Isolation The low sound level of the ACZ/AGZ units is suitable for most applications. When additional sound reduction is necessary, locate the

IMM ACZ/AGZ-4 ACZ / AGZ-BM 13 Table 2, Isolator Loads At Each Mounting Location (With Aluminum Fins) ACZ-B Model AGZ-BM Model Shipping Wt Operating

14 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 5, Isolator Locations ACZ-BS, AGZ-BM Less Evaporator Units Operating Weight Neoprene-In-Shear Mountings Spring-

1. Vibration eliminators to reduce vibration and noise transmission to the building. 2. Shutoff valves are required to isolate the unit from the pip

Figure 18, AGZ 026BM - AGZ 070BM, Typical Field Evaporator Water Piping AirVentFlowSwitchVibrationEliminatorsDrainOutletInletPIsolationValvesStrainerT

Variable Speed Pumping Variable water flow involves lowering the water flow through the evaporator as the load decreases. McQuay chillers are designe

CAUTION Do not use an automotive grade antifreeze. Industrial grade glycols must be used. Automotive antifreeze contains inhibitors which will caus

IMM ACZ/AGZ-4 ACZ / AGZ-BM 19 Evaporator Temperature Drop Factors Performance tables are based on a 10 degree F (5 degree C) temperature drop throug

Table of Contents Pre Start-up...59 Introduction...

20 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 13, Capacity and Power Derates, Models AGZ 075 to 130 Fouling Factor Chilled Water Delta T 0.0001 (0.0176) 0.00

ACZ Staging and Circuiting All ACZ units have two circuits, each with either two compressors, or three compressors on models ACZ 120 through 155. The

Remote Evaporator Refrigerant Piping Figure 20, AGZ-BM, Remote Evaporator Piping Schematic Refrigerant Specialties: AGZ-BM Remote Evaporator Chille

Refrigerant Piping All field piping, wiring, and procedures must be performed in accordance with ASHRAE, EPA, and industry standards. Proper refriger

Chilled Water Flow Switch A water flow switch must be mounted in the leaving chilled water line to prove that there is adequate water flow to the evap

Evaporator Flow and Pressure Drop Figure 21, AGZ 026BM – 130BM, Remote Evaporator Pressure Drop 026-030075-085-090100-110120-130035040045050055065-070

Wind Baffles and Hail Guards Wind Baffles/Hail Guards are a field-installed option that is used to stabilize unit operation in high wind areas and to

Vertical Support Rib 074758501 1 Top Cover 330409401 2 Front Panel 330409501 3 ¼ - 20 x ½” Screw (Place in Poly Bag) 046093807 Figure 23, Co

Physical Data Table 16, ACZ 030B - 040B, AGZ 026BM – 035BM MODEL NUMBER PHYSICAL DATA ACZ 030B, ACZ 035B ACZ 040B AGZ 026BM AGZ 030BM AGZ 035BM

IMM ACZ/AGZ-4 ACZ / AGZ-BM 29 Table 17, ACZ 045B - 060B, AGZ 040BM – 055BM MODEL NUMBER PHYSICAL DATA ACZ 045B AGZ 040BM ACZ 050B AGZ 045BM ACZ 055

Introduction General Description This manual covers two similar product lines: AGZ-BM, Packaged chiller with the evaporator shipped separately for rem

Table 18, ACZ 065B - 080B, AGZ 060BM – 070BM MODEL NUMBER PHYSICAL DATA ACZ 065B ACZ 070B ACZ 080B AGZ 060BM AGZ 065BM AGZ 070BM BASIC DATA Ckt.

Table 19, ACZ 090B - 110B, AGZ 075BM – 090BM MODEL NUMBER PHYSICAL DATA ACZ 090B ACZ 100B ACZ 110B AGZ 075BM AGZ 085BM AGZ 090BM BASIC DATA Ckt.

32 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 20, ACZ 120B - 155B, AGZ 100BM – 130BM MODEL NUMBER PHYSICAL DATA ACZ 120B AGZ 100BM ACZ 130B AGZ 110BM ACZ 140B

IMM ACZ/AGZ-4 ACZ / AGZ-BM 33 Electrical Data Standard Ambient Table 21, ACZ BC & AGZ BM Electrical Data, Single Point (105°F & below) Power

34 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 22, ACZ BC & AGZ BM Compressor & Fan Motor Amps, Single & Multi-Point (Up to 105°F) Rated Load Amps

IMM ACZ/AGZ-4 ACZ / AGZ-BM 35 Table 23, ACZ BC & AGZ BM Field Wiring, Single Point Wiring to Standard Power Block Wiring to Optional Non-Fused

Table 24, ACZ BC & AGZ BM Electrical Wiring, Single Point (Up to 105°F) Power Supply Field Wire Recomm’d. Fuse Minimum Max. Fuse ACZ AGZ Unit Si

IMM ACZ/AGZ-4 ACZ / AGZ-BM 37 Table 25, ACZ BC & AGZ BM Compressor and Fan Motor Amps, Single and Multi-Point (Up to 105°F) Rated Load Amps Lo

Table 26, ACZ BC & AGZ BM Field Wiring, Single Point Wiring to Standard Wiring to Optional Power Block Non-Fused Disconnect Switch AGZ ACZ Uni

IMM ACZ/AGZ-4 ACZ / AGZ-BM 39 Table 27, ACZ BC & AGZ BM Electrical Data, Multi-Point (Up to 105°F) Electrical Circuit #1 Electrical Circuit #2

Installation Note: Installation is to be performed by qualified personnel who are familiar with local codes and regulations. WARNING Sharp edges on u

40 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 28, ACZ BC & AGZ BM Field Wiring, Multi-Point Wiring to Standard Power Block Wiring to Optional Non-Fused

IMM ACZ/AGZ-4 ACZ / AGZ-BM 41 Table 29, ACZ BC & AGZ BM Field Wiring Data Wiring to Standard Power Block Wiring to Optional Non-Fused Disconne

42 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 30, ACZ BC & AGZ BM Electrical Data, Multi-Point (Up to 105°F) Electrical Circuit #1 Electrical Circuit #2

IMM ACZ/AGZ-4 ACZ / AGZ-BM 43 Electrical Data High Ambient Table 31, ACZ BC & AGZ BM Electrical Data, Single Point Power Supply Field Wire ACZ U

44 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 32, ACZ BC & AGZ BM Compressor & Fan Motor Amps, Single & Multi-Point (106°F to 125°F) Rated Load A

IMM ACZ/AGZ-4 ACZ / AGZ-BM 45 Table 33, ACZ BC & AGZ BM Electrical Data, Multi-Point (106°F to 125°F) Electrical Circuit #1 Electrical Circuit

Table 34, ACZ BC & AGZ BM Electrical Data, Single Point (Above 105°F) Power Supply Max. Fuse Field Wire Recomm’d. Fuse Minimum ACZ AGZ Circuit

IMM ACZ/AGZ-4 ACZ / AGZ-BM 47 Table 35, ACZ BC & AGZ BM Compressor and Fan Motor Amps, Single & Multi-Point (106°F to 125°F Rated Load Amps

48 ACZ / AGZ-BM IMM ACZ/AGZ-4 Table 36, ACZ BC & AGZ BM Electrical Data, Multi-Point (106°F) Electrical Circuit #1 Electrical Circuit #2 Power

Notes for “Electrical Data Single- and Multi-Point” Power: 1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus

Location Figure 3, Clearances Unit Placement 4 FT. (1220) CLEARANCE FORSERVICE ACCESS4 FT. (1220mm)CLEARANCE FORSERVICE ACCESSSEE TABLE BELOWDIMENSION

Figure 24, AGZ-BM, Typical Field Wiring Diagram DWG. 330423101 REV.0ATB2IF REMOTE STOPCONTROL IS USED,REMOVE LEAD 585FROM TERM. 52TO 72.5855272AUTOONO

Figure 25, ACZ-B, Typical Field Wiring Diagram LABEL DWG. 330423201 REV.0DTO COMPRESSOR(S)AND FAN MOTORSDISCONNECT(BY OTHERS)3 PHASEPOWER120VACCONTROL

Dimensional Data Figure 26, Dimensions: ACZ 030B - 080B AGZ 026BM – 070BM 100.4(2550)X88.0 (2335)25.1(637)43.8(1111)6.4 (162)14.3 (364)FIEL

Figure 27, Dimensions: ACZ 090B - 110B AGZ 075BM – 090BM ZY28.5(724)134.7 (3421)28.5(724)12.4(315)12.4 (315)2.0 (51)2.0 (51)51.3 (1304)34.3

Figure 28, Dimensions: ACZ 120B - 155B AGZ 100BM – 130BM 82.4 (2093)34.22(869.2)39.95(1014.7)48.00(1319.2)53.73(1364.7)67.8 (1721)12.4(315

Remote Evaporators Figure 29, Remote Evaporators, AGZ 026BM – 130BM 32.9(838)13.5 (342)11.4 (290)A.67 (17)1.9(49).85(22)8.3 (211)==1.9 (49)1.9 (49).87

Optional Features Any of the following options can be included on a unit: Controls Hot Gas Bypass Hot gas bypass permits unit operation down to 10% of

The interface kits on the MicroTech II™ controller are as follows: • BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet • LONWOR

Refrigerant Specialties Kit Required on AGZ-BM Remote Evaporator units consisting of thermal expansion valve, solenoid valve, sight glass and filter-d

Start-up Pre Start-up The unit must be inspected to see that no components became loose or damaged during shipping or installation. Start-Up There sh

Restricted Air Flow General The clearances required for design-life operation of ACZ/AGZ air-cooled units are described in the previous section. Occa

Shutdown Temporary 1. Put both circuit switches to the OFF position (Pumpdown and Stop). 2. After compressors have stopped, put System Switch (S1) t

Electrical Check Out CAUTION Electrical power must be applied to the compressor crankcase heaters 24 hours before starting unit to drive off refrige

VFD Low Ambient Control (Optional) The optional VFD fan control is used for unit operation below 35°F (2°C) down to a minimum of 0°F (-17°C). The con

NOTE: Before adjusting superheat, check that unit charge is correct and liquid line sight glass is full with no bubbles and that the circuit is operat

Unit Maintenance General On initial start-up and periodically during operation, it will be necessary to perform certain routine service checks. Among

An element inside the sight glass indicates the moisture condition corresponding to a given element color. If the sight glass does not indicate a dry

Service CAUTION Service on this equipment is to be performed by qualified refrigeration personnel familiar with equipment operation, maintenance, co

Remote Evaporator (AGZ-BM Only) The evaporator is the direct expansion, shell-and-tube type with refrigerant flowing through the tubes and water flowi

5. Check the unit subcooling value by reading the liquid line pressure and temperature at the liquid line near the filter-drier. The subcooling valu

ACZ/AGZ Troubleshooting Chart PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS 1. Main Switch. 1. Close Switch. 2. Fuse Blown. Circuit breakers

Case 1, Building or Wall on One Side of One Unit The existence of a screening wall, or the wall of a building, in close proximity to an air-cooled uni

PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS 1. Defective capacity control 1. Replace 2. Faulty thermostat stage or broken wire 2. Replac

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72 ACZ / AGZ-BM IMM ACZ/AGZ-4

(800) 432-1342 • www.mcquay.com IMM ACZ/A This document contains the most current product informa

Case 2, Two Units Side By Side Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters), or 8 feet (2.5meters), de

Case 3, Three or More Units Side By Side When three or more units are side by side, the outside units (1 and 3 in this case) are influenced by the mid