McQuay ACZ 045A Installation Manual

Installation, Operation and Maintenance Manual

IOMM ACZ/AGZ-2

Group: Chiller Part Number: 074644102 Effective: June 2002

Supersedes: IOM M ACZ/AGZ-1

AIR-COOLED, SCROLL COMPRESSOR, SPLIT SYSTEMS

Chiller w/ Remote Evaporator, AGZ 035AM-050AM Condensing Units, ACZ 045A-055A DX Evaporators, CDE

60 Hertz, R-22 Global Chiller Line

Table of Contents

Introduction.......................................3

Inspection.................................................... 3

Installation......................................... 4

Handling...................................................... 4

Location....................................................... 5

Service Access............................................. 5

Vibration Isolators....................................... 7

Water Piping................................................ 8

Flow Switch................................................. 9

Glycol Solutions........................................ 10

Evaporator Flow and Pressure Drop.......... 12

Refrigerant Piping ..................................... 13

Physical Data ...................................18

Electrical Data................................. 21

Field Wiring............................................... 21

Electrical Data AGZ-AM........................... 22

Electrical Data ACZ................................... 22

Electrical Notes ......................................... 23

Wiring Diagrams ....................................... 25

Dimensional Data............................ 36

Startup.............................................. 38

Pre Start-up................................................ 38

Start-Up..................................................... 38

Shutdown................................................... 38

Water Piping Checkout.............................. 39

Refrigerant Piping Checkout ..................... 39

Refrigerant Charging................................. 40

Electrical Check Out.................................. 41

Operation .........................................42

System A djustment .................................... 44

Liquid Sightglass and Moisture Indicator.. 44

Thermostatic Expansion Valve...................44

Crankcase Heaters......................................45

Water Cooler..............................................45

Global UNT Controller, AGZ-AM. 46

General Description................................... 46

Optional Sensors........................................ 46

Controller Inputs /Outputs......................... 48

Additional UNT Features...........................51

Alarms........................................................53

ZONE TERMINAL (optional)...................54

Zone Terminal Glossary............................. 58

Global UNT Controller Troubleshooting

Chart.......................................................... 60

MicroTech Controller, AGZ-AM....61

General Description................................... 61

Optional Sensor Packages..........................61

Installation.................................................61

Sequence of Operation............................... 70

Start-Up and Shutdown .............................. 72

Keypad / Display ....................................... 73

Menu Descriptions..................................... 76

Trouble Analysis for the AGZ MicroTech

Controller................................................... 87

Test Procedures..........................................90

Unit Maintenance............................97

Preventative Maintenance Schedule.......... 98

Service ..............................................99

Liquid Line Solenoid Valve....................... 99

Evaporator ............................................... 100

Refrigerant Charging................................100

Troubleshooting Chart............................. 102

Sequence of Operation .............................. 42

Hot Gas Bypass (Optional)........................ 43

Filter Driers ............................................... 44

Our facility is ISO9002 Certified

"McQuay" is a registered trademark of McQuay International

"Information represents McQuay International products at the time of publication and we reserve the right to

make changes in design and construction at anytime without notice"

2 IOMM ACZ/AGZ-2



2002 McQuay International

Introduction

This Installation and Operating Manual contains information on three different McQuay product lines

• Model AGZ-AM This is a split packaged chiller consisting of an outdoor unit

• Model ACZ This is an air-cooled condensing unit for use with a remote

• Model CDE This is a DX water chiller that can be used in conjunction with the

IMPORTANT INFORMATION

and an evaporator shipped loose for remote mounting. Liquid line specialties are field supplied and mounted. Capacity control is either Johnson UNT or McQuay’s MicroTech Control. The outdoor unit is basically the same as an ACZ condensing unit, the difference being in how it is packaged and in the control furnished.

evaporator, typically a water chiller or DX coil. No capacity control is supplied, nor are any liquid line specialties nor evaporator.

Model ACZ condensing unit. No controls or specialties are included.

Nomenclature

A G/C Z - XXX A S/M

Air-Cooled

G=Chiller

C=Cond. Unit

Scroll Compressor

Application S=Standard Cooling M=Remote Evaporator

Design Vintage

Model Size

Inspection

Check all items carefully against the bill of lading. Inspect all units for damage upon arrival. Report shipping damage and file a claim with the carrier. Check the unit name plate before unloading, making certain it agrees with the power supply available. McQuay is not responsible for physical damage after unit leaves the factory.

Note: Unit shipping and operating weights are available in the Physical Data tables beginning on page 18.

IOMM ACZ/AGZ-2 3

Installation

Note: Installation is to be performed by qualified personnel who are familiar with local codes

and regulations.

WARNING

Sharp edges and coil surfaces are a potential hazard. Avoid contact with them.

Handling

Be careful to avoid rough handling of the unit. Do not push or pull the unit from anything other t han the base. Block the pushing vehicle away from the unit to prevent damage to the sheet metal cabinet and end frame (see Figure 1).

To lift the unit, 2 1/2" (64mm) diameter lifting holes are provided in the base of the unit. Arrange spreader bars and cables to prevent damage to the condenser coils or cabinet (see Figure 2).

Figure 1, Suggested Pushing Arrangement

Blocking is required

across full width

Figure 2, Suggested Lifting Arrangement

Number of fans may vary

Spreader Bars

Recommended

(use caution)

4 IOMM ACZ/AGZ-2

from this diagram. The

lifting method will remain

the same.

These rigging holes

must be used.

Location

Unit Placement

AGZ-AM and ACZ units are for outdoor applications and can be mounted on a roof or ground level. Set units on a solid and level foundation. For roof mounted applications, install the unit on a steel channel or I-beam frame to support the unit above the roof. For ground level applications, install the unit on a substantial base that will not settle. A one piece concrete slab with footings extended below the frost line is recommended. Be sure the foundation is level (within 1/2” [13 mm] over its length and width). The foundation must support the operating weights listed in the Physical Data Tables.

On ground level applications protect the unit against vandalism by using the optional fin and base guards or by erecting a screen fence. The fence must allow free flow of air to the condenser coil for proper unit operation.

The remote evaporator on the AGZ-AM can be mounted indoors, or if precautions against freeze-up are taken where subjected to below freezing temperatures, can be mounted outdoors It is equipped with a heating element.

Clearances

The flow of air to and from the condenser coil must not be limited. Restricting air flow or allowing air recirculation will result in a decrease in unit performance and efficiency. There must be no obstruction above the unit that would deflect discharge air downward where it could be recirculated back to the inlet of the condenser coil. The condenser fans are propeller type and will not operate with ductwork on the fan outlet.

Install the unit with enough si de clearance for air entranc e to the coil and for servicing. Provide service access to the evaporator, compressors, electrical control panel and piping components as shown in Figure 3.

Do not allow debris to accumulate near the unit. Air movement may draw debris into the condenser coil causing air starvation. Give special consideration to low ambient operation where snow can accumulate. Keep condenser coils and fan discharge free of snow or other obstructions to permit adequate airflow.

Sound Isolation

The ultra-low sound levels of the AGZ outdoor unit and the ACZ condensing unit is suitable for most applications. When additional sound reduction is necessary, locate the unit away from sound sensitive areas. Avoid locations beneath windows or between structures where normal operating sounds may be objectionable. Reduce structurally transmitted sound by isolating water lines, electrical conduit and the unit itself. Use wall sleeves and rubber isolated piping hangers to reduce transmission of water or pump noise into occupied spaces. Use flexible electrical conduit to isolate sound transmission through electrical c onduit. Spring isolators are effective in reducing the low amplitude sound generated by scroll compressors and for unit isolation in sound sensitive areas.

Service A ccess

Each end of the unit must be accessible after installation for periodic service. Compressors, filterdriers, and manual liquid line shutoff valves are accessible. The high pressure control is located in the control panel when using the Global UNT controller, and on the compressor when using the MicroTech controller. Low pressure, and motor protector controls are on the compressor. Most other operational, safety and starting controls are located in the unit control box.

The condenser fan and motors can be removed from the top of the unit.

IOMM ACZ/AGZ-2 5

Figure 3, Clearance Requirements

6 IOMM ACZ/AGZ-2

Vibration Isolators

Vibration isolators are recommended for all roof mounted installations or wherever vibration transmission is a consideration.

Table 1 and Table 2 list isolator point loads for all unit sizes, Figure 4 shows isolator locations. See Dimensional Data for detailed dimensions required to secure each isolator to the mounting surface.

The spring flex isolators are white type CP2-32, McQuay part number 047792932. A total of four per unit is required.

Figure 4, Isolator Locations Spring Isolator Dimensions

Table 1 , Isolator Loads At Each Mounting Location With Aluminum Fins

ACZ AGZ-AM 1 2 3 4 Total Unit

Size Size lb kg lb kg lb kg lb kg lb kg 030A - 838 380 944 428 773 351 870 395 3425 1554 035A 030AM 838 380 944 428 773 351 870 395 3425 1554 040A 035AM 850 386 960 435 785 356 885 401 3480 1579 045A 040AM 864 392 974 442 797 362 900 408 3535 1603 050A 045AM 928 421 1048 475 858 389 966 438 3800 1724 055A 050AM 940 426 1062 482 868 394 980 445 3850 1746

Table 2, Isolator Loads At Each Mounting Location With Copper Fins

ACZ

Size 030A - 946 429 1066 484 873 396 985 447 3870 1755

035A 030AM 946 429 1066 484 873 396 985 447 3870 1755 040A 035AM 960 435 1082 491 886 402 997 452 3925 1780 045A 040AM 973 441 1096 497 899 408 1012 459 3980 1805 050A 045AM 1038 471 1170 531 958 435 1079 489 4245 1926 055A 050AM 1050 476 1184 537 970 440 1091 495 4295 1948

AGZ-

Size lb kg lb kg lb kg lb kg lb kg

1234Total Unit

IOMM ACZ/AGZ-2 7

Water Piping

Local authorities can supply the installer with the proper building and safety codes required for safe and proper installation.

Install piping with minimum bends and changes in elevation to minimize pressure drop. Consider the following when installing water piping:

1. Vibration eliminators to reduce vibration and noise transmission to the building.

2. Shutoff valves to isolate the unit from the piping system during unit servicing.

3. Manual or automatic air vent valves at the high points of the system. Install drains at the lowest

points in the system.

4. A means of maintaining adequate system water pressure ( expansion tank or r egulating valve).

5. Temperature and pressure indicators located at the unit to aid in unit servicing.

6. A strainer or other means of removing foreign matter from the water before it enters the pump.

Place the strainer far enough upstream to prevent cavitation at the p ump inlet (consult p ump manufacturer for recommendations). The use of a strainer will prolong pump life and keep system performance up.

7. Place a strainer in the water line just before the inlet of the evaporator. This will help prevent

foreign material from entering and decreasing the performance of the evaporator.

8. The remote shell-and-tube evaporator has a thermostat and heating cable to prevent freeze-up down to -20°F (-29°C). It is suggested that the heati ng cable be used a nd wired to a separate 110V supply circuit should the evaporator be located in an area subject to freezing temperatures. If used, all water piping to the unit must also be protected to prevent freezing.

9. If the unit is used as a replacement chiller on a previously existing piping system, flush the system thoroughly before unit installation. Regul ar water analysis and chemica l wate r treatment for the evaporator loop is recommended immediately at equipment start-up.

10. The total water volume in the system should be sufficient to prevent frequent “on-off” cycling. Turnover rate should not be less than 15 minutes for normal variable cooling loads. Turnover rate for process cooling or a constant load, should not be less than 6 minutes.

11. When glycol is added to the water system for freeze protection, the refrigerant suction pressure will be lower, cooling performance less, and water side pressure drop greater. If the percentage of glycol is high, or if propylene is used instead of ethylene glycol, the added pressure drop and loss of performance could be substantial. Reset the freezestat and low leaving water alarm temperatures. The freezestat is factory set to default at 36°F (2.2°C). Reset the freezestat setting to approximately 4 to 5 degrees F (2.3 to 2.8 degrees C) below the leaving chilled water setpoint temperature. See the section titled “Glycol Solutions” for additional information concerning glycol.

12. Perform a preliminary leak check before insulating the piping and filling the system.

13. Piping insulation should include a vapor barrier to prevent condensation and possible damage to the building structure.

8 IOMM ACZ/AGZ-2

Figure 5, Typical Evaporator Field Water Piping

Flow Switch

Mount a water flow switch in either the entering or leaving water line to shut down the unit when water flow is interrupted.

A flow switch is available from McQuay (part number 017503300). It is a “paddle” type switch and adaptable to any pipe size from 3” (76mm) to 8” (203mm) nominal. Certain minimum flow rates are required to close the switch and are listed in Table 3. Installation should be as shown in Figure 6. Connect the normally open contacts of the flow switch in the unit control center at terminals 5 and 6. There is also a set of normally closed contacts on the switch that can be used for an indicator light or an alarm to indicate when a “no flow” condition exists. Freeze protect any flow switch that is installed outdoors.

NOTE: Differential pressure switches are not recommended for outdoor installation.

Table 3, Flow Switch Minimum Flow Rates

NOMINAL PIPE SIZE

INCHES (mm)

1 (25.4) 6.00 (0.38) 1 1/4 (31.8) 9.80 (0.62) 1 1/2 (38.1) 12.70 (0.80)

2 (50.8) 18.80 (1.20)

2 1/2 (63.50 24.30 (1.50)

3 (76.20 30.00 (1.90) 4 (101.6) 39.70 (2.50) 5 (127.0) 58.70 (3.70) 6 (152.4) 79.20 (5.00)

MINIMUM REQUIRED FLOW TO ACTIVATE SWITCH - GPM (L/S)

Figure 6, Flow Switch Installation

Flow direction marked

on switch

1" (25mm) NPT flow

switch connection

Tee

IOMM ACZ/AGZ-2 9

Note: The procedure does not specify the type of glycol. Use the derate factors found in Table 4 for corrections when using ethylene glycol and those in Table 5 for propylene glycol.

Glycol Solutions

The use of a glycol/water mixture in the CDE evaporator to prevent freezing will reduce system capacity and efficiency and increase pressure drop. The system capacity, required glycol solution flow rate, and pressure drop with glycol may be calculated using the following formulas and Table 4 and Table 5.

1. Capacity – Multiply the capacity based on water by the Capacity correction factor from or Table

4 and Table 5 to

2. Flow – Multiply the water evaporator flow by the Flow correction factor from and Table 4 or

Table 5 determine the increased evaporator flow due to glycol If the flow is unknown, it can be calculated from the following equation:

(gpm) Flow Glycol ×

For Metric Applications – Use the following equation for metric applications:

(l/s) Flow Glycol

Pressure drop -- Multiply the water pressure drop from Figure 7 by Pressure Drop correction

CapacitykW

elta

−×=18.4

factor from Table 4 or Table 5 to obtain corrected glycol pressure drop. High concentrations of propylene glycol at low temperatures may cause unacceptably high pressure drops.

Power -- Multiply the water system power by Power correction factor from Table 4 or Table 5.

Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in service stations) to determine the freezing point. Obtain percent glycol from the freezing point table below. It is recommended that a minimum of 25% solution by weight be used for protection against corrosion.

glycolCapacityTons

)(24

TDelta

−

FactorCorrectionFlow

CAUTION

Do not use an automotive grade antifreeze. Industrial grade glycols must be used. Automotive antifreeze contains inhibitors which will cause plating on the copper tubes within the chiller evaporator. The type and handling of glycol used must be consistent with local codes.

Table 4, Ethylene Glycol Correction Factors

E.G.

10 26 -3 0.991 0.996 1.013 1.070 20 18 -8 0.982 0.992 1.040 1.129 30 7 -14 0.972 0.986 1.074 1.181 40 -7 -22 0.961 0.976 1.121 1.263 50 -28 -33 0.946 0.966 1.178 1.308

Table 5, Propylene Glycol Correction Factors

P.G.

10 26 -3 0.987 0.992 1.010 1.068 20 19 -7 0.975 0.985 1.028 1.147 30 9 -13 0.962 0.978 1.050 1.248 40 -5 -21 0.946 0.971 1.078 1.366 50 -27 -33 0.929 0.965 1.116 1.481

Freeze Point °F °C

Capacity Power Flow Pressure Drop

10 IOMM ACZ/AGZ-2

Table 6, Capacity and Power Derates

Chilled Water

ALTITUDE

SEA

LEVEL

2000 ft.

610 m

4000 ft. 1220 m

6000 ft. 1830 m

Delta-T

°F °C Cap. kW Cap. kW Cap. kW

6 3.3 0.992 0.995 0.996 0.982 0.911 0.935

8 4.4 0.995 0.997 0.969 0.984 0.914 0.937 10 5.6 1.000 1.000 0.975 0.986 0.919 0.939 12 6.7 1.005 1.002 0.980 0.989 0.923 0.941 14 6.8 1.010 1.005 0.985 0.991 0.928 0.943 16 8.9 1.014 1.007 0.989 0.993 0.930 0.944

6 3.3 0.978 1.005 0.957 0.990 0.903 0.943

8 4.4 0.982 1.007 0.961 0.993 0.905 0.945 10 5.6 0.986 1.009 0.965 0.995 0.909 0.947 12 6.7 0.992 1.011 0.970 0.998 0.914 0.949 14 6.8 0.997 1.014 0.973 1.001 0.919 0.952 16 8.9 1.000 1.016 0.975 1.002 0.921 0.953

6 3.3 0.966 1.016 0.944 0.999 0.894 0.951

8 4.4 0.969 1.018 0.947 1.001 0.896 0.953 10 5.6 0.973 1.021 0.952 1.005 0.900 0.956 12 6.7 0.978 1.025 0.956 1.008 0.904 0.958 14 6.8 0.982 1.027 0.959 1.011 0.909 0.960 16 8.9 0.986 1.028 0.961 1.015 0.911 0.961

6 3.3 0.953 1.025 0.930 1.009 0.884 0.961

8 4.4 0.955 1.028 0.934 1.011 0.887 0.962 10 5.6 0.959 1.031 0.939 1.013 0.890 0.964 12 6.7 0.963 1.034 0.942 1.017 0.895 0.966 14 6.8 0.968 1.036 0.946 1.020 0.899 0.968 16 8.9 0.972 1.037 0.949 1.024 0.902 0.969

0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)

Fouling Factor

AGZ-AM with Upper Panels Remove d

IOMM ACZ/AGZ-2 11

Figure 7, Pressure Drop Curve

AGZ 035AM - 040AM

CDE 1004-1

GZ 045AM - 050AM

CDE 1204-3

CDE

AGZ-AM Unit Size

1004-1 035AM 9.2 82 5.17 23.1 137 8.62 3.9 51 3.23

1204-3 045AM 11.2 106 6.69 28.2 177 11.15 4.8 66 4.18

Minimum and maximum flows are established to ensure the Delta-T for each unit size falls within the 6 - 16°F range for proper unit control.

Unit Size

x 040AM 11.5 93 5.87 28.8 155 9.78 4.9 58 3.67

x 050AM 13.4 117 7.38 33.6 195 12.30 5.7 73 4.61

Pressure Drop Flow Pressure Drop Flow Pressure Drop Flow

(ft) of Water (gpm) (lps) (ft) of Water (gpm) (lps) (ft) of Water (gpm) (lps)

NOMINAL MAXIMUM MINIMUM

Evaporator Flow and Pressure Drop

Evaporator flow rate must fall between the minimum and maximum values shown in the evaporator

pressure drop table on Figure 7.

Measure the chilled water pressure drop through the evaporator at factory installed pressure taps. It is

important not to include the effect of valves or strainers in these readings.

Va rying chilled water flow through the evaporator while the compressor(s) are operating is not

recommended.

12 IOMM ACZ/AGZ-2

Refrigerant Piping

Introduction

Proper refrigerant piping can represent the difference between a reliable, trouble free system and months or years of inefficient, problematic performance.

System concerns related to piping are:

Refrigerant pressure drop

Solid liquid feed to the expansion valve(s)

Continuous oil return

The most important and least understood is number 3. “Continuous oil return”. The failure of oil to return at or close to the rate of displacement from the compressor can result in oil trapping and ultimate compressor failure.

On the other hand, the instantaneous return of a large volume of compressor oil (slug) can be equally damaging to a compressor.

All compressors displace some oil during operation. Reciprocating compressors displace more than centrifugals, scroll and McQuay screw compressors. Oil is carried into compressor cylinders with suction gas; and that same gas entrains oil present on cylinder walls as it is being compressed. The sum of the two is then pumped into the discharge piping.

More oil is displaced at compressor start-up than during the normal running periods. If a compressor experiences excessive starts because of recycling pumpdown control, the oil may be pumped out and trapped in the condenser with the refrigerant charge. This oil may not return regardless of the adequacy of the piping system.

A similar problem to a lesser extent occurs when the equipment is oversized for the available cooling load.

In short, extreme care should be exercised to assure that both piping and controls are suitable for the application such that displaced oil is returned to the compressor moderately. Note that oil loss to the system can be due to a hang up in the evaporator, as well as in the piping.

Suction Lines

McQuay recommends the use of ASHRAE for guidelines in sizing and routing piping with one exception. See the 1998 ASHRAE Handbook Refrigeration Edition, Chapter 2 for tables and guidelines. The single exception is to the piping of direct expansion cooling coils located above the compressors. In all cases, regardless of whether the equipment has pumpdown control or not, a trap in the suction line equal to the height of the coil section is recommended. In its absence, upon a power failure, all of the liquid in the coil will fall by gravity to the compressor below.

Suction line gas velocities may range between 900 and 4000 feet per minute. Consideration should be given to the possibility of objectionable noise in or adjacent to occupied space. Where this is a concern, gas velocities on the low side are recommended.

Routing must also take into account the requirement established in the latest ANSI/ASHRAE 15. To size the suction line, determine:

The maximum t ons for the circuit

The actual length in feet

The equivalent length contributed by elbows, fittings, valves or other refrigerant specialties.

ASHRAE Tables 2-10, 11 & 12

If a vertical riser exists including the trap at the coil, determine the minimum tons for the

circuit.

IOMM ACZ/AGZ-2 13

Add b and c above to obtain the total equivalent feet. Use ASHRAE Table 3 (for R22) or Table 4 (for

R134a). Suction line selections are based upon the pressure equivalent of a 2ºF loss per 100

equivalent feet.

Select a line size that displays an equal or slightly larger tons then that determined in 1a) above.

To determine the actual line loss:

Modify the table tons by the value in Note 4 of Table 3 or 4 for the design condensing

temperature.

Use the formula in Note 3 to calculate the line loss in terms of the saturation temperature.

Convert the saturation temperature loss calculated to a pressure drop equivalent using the (Delta)

listed in the table for the comparable delta temperature.

Caution: Excessive pressure drop is undesirable because:

• It reduces available compressor capacity.

•

It increases power consumed for the net tons realized.

•

It may affect the performance of both the evaporator and the expansion valve previously selected

for the application.

The line loss calculated, expressed in temperature, or PSID pressure drop will be used to establish the

temperature required at the evaporator to produce the required cooling, as well as, the suction

pressure that the compressor must operate at to deliver the required capacity.

Having selected the suction line siz e, based upo n total equivale nt length and maximum tons, verify

the line size selected will maintain entrainment of the lubricating oil up any vertical risers at the

minimum tons for the circuit. See d above, and ASHRAE Table 2-13.

If the line size selected will not maintain satisfactory oil return in a suction riser, the following options

are available:

The vertical length can be sized smaller to accommodate the lower circuit tons at reduced load.

Minimum compressor capacity can be increased by eliminating the lowest step of compressor

capacity.

Hot gas bypass can be introduced at the distributor to the evaporator, increasing the volume of gas

available in the suction line to entrain the oil.

An oil separator may be installed in the discharge line.

With reciprocating compressor units only, and only as a last resort, double suction risers can be

utilized. Since a double suction riser works by providing an oil trap to assure the return of some oil,

with refrigerant, up the smaller diameter line, a) the trap must be as small as possible, b) there must

not be multiple traps, and c) whenever double risers are used in a suction line, a suction accumulator

with a controlled oil return must be installed in the line ahead of the compressor.

Note: In horizontal refrigerant gas lines, oil return to compressors is assured by sizing lines at a

velocity above the minimum recommended and pitching the lines in the direction of refrigerant flow.

Sizing A Double Riser

At maximum circuit tons, the line size should be selected from the table based upon the recommended

maximum line loss .

With the minimum tons known, a smaller line size should be selected from ASHRAE Chapter 2, Table

13 or 14 capable of entraining oil at the reduced tons. The smaller sized line should be the one

installed to be always active.

The net internal area of this smaller sized line (see Table 13 or 14) should be deducted from the area

of the size selected in paragraph 1) immediately above. The remainder represents the area of the

14 IOMM ACZ/AGZ-2

other riser. From Table 13 or 14, select a line size with an area equal, or close, to the calculated net

area. The combination of these two risers will provide the required performance at full circuit tons. The line selected for the minimum load should always be active; and both lines should enter the overhead horizontal line in a manner to prevent spillage of oil back down the other riser.

Underground Refrigerant Lines

McQuay does not recommend the installation of suction lines underground. If job conditions require that they be located below ground, a suitable sized suction accumulator must be installed ahead of the compressor to interrupt liquid refrigerant slugs at start-up.

Long Vertical Riser Installation

Where job conditions require refrigerant gas lifts of more than 25 feet, McQuay recommends the installation of a short trap half-way up the riser or at not more than 20 feet intervals. These traps are required to capture and hold small quantities of oil during off cycles.

Figure 8, DX Coil Piping

Condensing Unit Above Coil Condensing Unit Below Coil

LIQUID TO

COIL

LIQUID TO

COIL

SUCTION TRAP SHORT AS FITTINGS PERMIT

DUAL RISER SUCTION TRAP SHORT AS FITTINGS PERMIT

EXPANSION VALV CONTROL BULB STRAP TO LINE

ND INSULATE

LIQUID TO

COIL

SUCTION TRAP SHORT AS FITTINGS PERMIT

EXPANSION VALVE CONTROL BULBS STRAP TO LINE AND INSULATE

IOMM ACZ/AGZ-2 15

Liquid Lines

Liquid lines are generally sized for 1 to 2 degree F line losses or their equivalent in pressure drop.

Actual selection can vary based upon the pressure drop expected from refrigerant specialties such as

solenoids, refrigerant driers, valves, etc. piping lifts or risers and the amount of condenser sub-cooling

expected.

The principal concern in sizing and routing liquid lines is assurance that liquid is present in the line at

start-up of the compressor, and that liquid and not vapor is available at the inlet to the expansion valve

during system operation.

Liquid may not be available in a liquid line at start-up if:

The solenoid valve is located adjacent to the condenser or condensing unit; remote from the

expansion valve.

An excessive length of liquid line is located in a heated ambient and the application permits

migration of the refrigerant to a cold air-cooled condenser.

Liquid refrigerant is permitted to gravitate from the liquid line to the condenser because of the

relative location of components.

Liquid line solenoid valves should be located adjacent to the expansion valve with possibly only

a sight glass interposing the two.

In the event 2) or 3) above are possible, the application should include a check valve at the condenser

end of the liquid line. The check valve should be a low pressure drop valve. The line between the

check valve and the solenoid valve can be comparable to a pressure vessel and as the line becomes

heated refrigerant trapped in the confined space will increase in pressure. The check valve should

include a pressure relief devise, relieving from the line side to the condenser side of the circuit. The

relief can be sized for a pressure differential from 80 to 180 psi, but not more than 180 psi, and should

be auto-resetting as the pressure is relieved.

CAUTION: The liquid line should not include a check valve unless the line also

includes an automatic resetting pressure relief device.

CAUTION: If the relief device being used is relieving from the line to the condenser side of the check valve, the maximum desirable pressure differential with R-22 refrigerant is 180 psi. With 134a, 100 psi.

If liquid lines are short, they may be of smaller diameter than the size indicated in the ASHRAE Refrigerant Handbook, 1998 Edition, Chapter 2, Tables 3 or 4. As indicated above, the designer must size the liquid line to assure that pure liquid will reach the inlet of the expansion valve. If the condenser is sized to produce 10ºF of subcooling, and each degree represents 3.05 psi with R-22 (or

2.2. psi with R-134a), the liquid line and its refrigerant specialties may have pressure losses totaling 10 x 3.05 psi (or 10 x 2.2) and still satisfy the objective of believing pure liquid to the expansion valve.

In calculating the pressure losses, or gains, note that each foot of rise in a liquid line results in an approximate 0.5 psi loss. Thus a 10 foot rise represent 5 pounds per square inch loss in refrigerant pressure, or the equivalent of 1.6ºF subcooling with R-22. Total line losses will include values for line friction, equivalents for valves and elbows and pressure losses from manufacturers’ catalogs for driers, solenoids, sight glasses, etc.

In estimating condenser subcooling, note that saturated condensing pressure should be read, or estimated, at the same point in the system where the liquid refrigerant temperature is obtained. That

16 IOMM ACZ/AGZ-2

condensing pressure is not the discharge pressure read at the compressor outlet. Because it is less, the net value of subcooling will be lower than might otherwise be assumed.

Where rises in liquid lines result in a 0.5 psi loss per foot of lift, a drop in the liquid line results in a rise in the refrigerant pressure. A substantial drop in the liquid line can assure the existence of pure liquid at the valve. If it is a substantial increase because of a large drop, the expansion valve selection must be re-checked to confirm that the valve to be used is not radically oversized.

Liquid Lines from Condensers to Receivers

Receivers in a refrigerant system have both liquid and gas contained within the same vessel. In aircooled condenser applications, the condensing temperature can change rapidly resulting in the requirement for more liquid at a lower temperature and pressure to be introduced into the receiver.

In order for this flow of lower temperature and pressure refrigerant to enter the receiver:

The receiver must be located below the condenser outlet with no restrictions in the line.

The liquid line connecting the condenser and the receiver must be sized for a maximum velocity

of 100 fpm. Piping sizes for this are shown in the ASHRAE tables.

Note: If the interconnecting piping described above contains a SeasonTrol type head pressure control valve representing a restriction in the liquid line, a separate vent from the top of the receiver to the discharge line entering the condenser is required.

Liquid Line Components

To assist in laying out and specifying split systems, the following recommended (or equal) components can be used.

Table 7, Liquid Line Components

Unit

Model

ACZ030A Circuit #1 15.9 (191) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

ACZ035A Circuit #1 15.9 (191) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

ACZ040A Circuit #1 19.2 (230) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

ACZ045A Circuit #1 21.8 (262) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

ACZ050A Circuit #1 22.1 (265) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

ACZ055A Circuit #1 26.8 (322) C-967 E19S270 SA-17S OVE-30 7/8-1-3/8

Circuit

Circuit #2 19.1 (229) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8

Circuit #2 26.8 (322) C-967 E19S270 SA-17S OVE-30 7/8-1-3/8

Nom.R-22

Tons

(mbh)

Sporlan Part Number Shown - (Equivalents Are Acceptable)

Filter Drier

Solenoid

Valve

Sight

Glass

Expansion

Valve

Unit Conn.

In/Out

IOMM ACZ/AGZ-2 17

Physical Data

AGZ-AM

Table 8, AGZ 035AM - 050AM

CAPACITY @ ARI Conditions (1), Tons (kW) 34.3 (120.5) 38.9 (136.7) 44.3 (156.0) 48.9 OUTDOOR UNIT BASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2

Add'l Weight If Copper Finned Coils, Lb (kg) 445 (200) 445 (200) 445 (200) 445 (200)

COMPRESSORS

CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT

CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING

Maximum Relief Valve Pressure Setting, psig

CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE

REMOTE DIRECT EXPANSI ON EVAPORATOR - BAFFLED SHELL AND THRU-TUBE

Maximum Refrigerant Working Pressure, psig

Water Inlet / Outlet Victaulic Connections, In.

NOTES:

1. Nominal capacity based on 95°F ambient air and 54°F/44°F water range, no refrigerant line loss.

2. Includes evaporator. Does not include suction and liquid line charge. Outdoor unit and evaporator are shipped with R-22

3. Units with 1.0 Hp Fan Motors, Uses 1.5 Hp Fan Motors when unit is 380V / 60 Hz and 575V / 60Hz.

PHYSICAL DATA AGZ-AM MODEL NUMBER

STANDARD EFFICIENCY 035AM 040AM 045AM 050AM

Number Of Refrigerant Circuits 2 2 2 2 Unit Operating Charge, R-22, Lbs.(2) 36 36 40 40 42 42 44 44 Unit Operating Charge, R-22, (kg) (2) (16.3) (16.3) (18.1) (18.1) (19.0) (19.0) (19.9) (19.9)

Cabinet Dimensions, LxWxH, In. 94.0 x 88.2

Cabinet Dimensions, LxWxH, (mm) 2388 x 2241

Unit Operating Weight, Lb (kg) 2925 (1330) 2980 (1355) 3025 (1375) 3075 (1395)

Unit Shipping Weight, Lb (kg) 2865 (1300) 2920 (1325) 2950 (1340) 3000 (1360)

Type Tandem Scrolls Tandem Scrolls Tandem Scrolls Tandem Scrolls

Nominal tonnage of each Compressor 9.0 9.0 10.0 10.0 10.0 13.0 13.0 13.0

Number Of Compressors per Circuit 2 2 2 2 2 2 2 2

Oil Charge Per Compressor, Oz. 140 140 140 140 140 140 140 140 Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496) (496) (496)

Standard Staging - Circuit #1 in Lead

Standard 4 Stages

Standard Staging - Circuit #2 in Lead

Standard 4 Stages

Coil Face Area,Sq. Ft. 46.4 46.4 46.4 46.4 46.4 46.4 46.4 46.4

Coil Face Area, (M2) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3)

Finned Height x Finned Length, In. 80

Finned Height x Finned Length, (mm) 2032

Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2

(kPa)

Number Of Fans - Fan Diameter, In. (mm) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712)

Number Of Motors - HP (kW) (3) 4 - 1.0 (0.7) 4 - 1.0 (0.7) 4 - 1.5 (1.1) 4 - 1.5 (1.1)

Fan And Motor RPM, 60Hz 1140 1140 1140 1140

60 Hz Fan Tip Speed, FPM (M/Sec) 8357 (35.4) 8357 (35.4) 8357 (35.4) 8357 (35.4)

60 Hz Total Unit Airflow, CFM (M3/sec) 34400 (16.2) 34400 (16.2) 388000 (17.9) 388000 (17.9)

Model Number 1004-1 1004-1 1204-3 1204-3

Diameter, in. - Length, Ft. 10 - 04 10 - 04 12 - 04 12 - 04 Diameter, (mm) - Length, (mm) (254) - (1220) (254) - (1220) (305) - (1220) (305) - (1220) Unit Operating Weight, Lb (kg) 555 (250) 555 (250) 777 (350) 777 (350)

Unit Shipping Weight, Lb (kg) 540 (245) 540 (245) 745 (340) 745 (340)

Water Volume, Gallons, (L) 9.1 (34.5) 9.1 (34.5) 12.8 (48.5) 12.8 (48.5)

Maximum Water Pressure, psig (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)

(kPa)

(mm)

Drain - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5)

Vent - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5)

holding charge.

x 86.2

x 2190

0-25-50-75-100 0-25-50-75-100 0-22-50-72-100 0-25-50-75-100

0-25-50-75-100 0-25-50-75-100 0-28-50-78-100 0-25-50-75-100

x 83.580x 83.580x 83.580x 83.580x 83.580x 83.580x 83.580x 83.5

x 2121

(3103)

2032

x 2121

450

(3103)

225 (1552) 225 (1552) 225 (1552) 225 (1552)

4 (101.6) 4 (101.6) 4 (101.6) 4 (101.6)

94.0 x 88.2 x 86.2

2388 x 2241

x 2190

2032

x 2121

450

(3103)

2032

450

94.0 x 88.2 x 86.2

2388 x 2241

x 2190

2032

x 2121

450

(3103)

2032

x 2121

450

(3103)

94.0 x 88.2 x 86.2

2388 x 2241

x 2190

2032

x 2121

450

(3103)

2032

x 2121

450

(3103)

18 IOMM ACZ/AGZ-2

ACZ Condensing Units

Table 9, ACZ 030A - 040A

PHYSICAL DATA ACZ MODEL NUMBER

UNIT CAPACITY @ ARI Conditions (1), Tons (kW) 31.8 (111.7) 35.0 (123.0) 38.4 (134.9) BASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2

Add'l Weight If Copper Finned Coils, Lbs. (kg) 445 (200) 445 (200) 445 (200)

COMPRESSORS

CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT

CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING

Maximum Relief Valve Pressure Setting, psig (kPa) 450 (3103) 450 (3103) 450 (3103) 450 (3103) 450 (3103) 450 (3103)

CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE

NOTES:

1. Nominal capacity based on 95°F ambient air and 45°F saturated suction temperature, no refrigerant line loss.

2. Does not include evaporator, suction or liquid line charge. Unit shipped with R-22 holding charge.

3. Units with 1.0 Hp Fan Motors, Uses 1.5 Hp Fan Motors when unit is 380V / 60 Hz and 575V / 60Hz.

STANDARD EFFICIENCY 030A 035A 040A

Number Of Refrigerant Circuits 2 2 2 Unit Operating Charge, R-22, Lbs. (2) 30 30 30 30 30 30 Unit Operating Charge, R-22, (kg) (2) (13.6) (13.6) (13.6) (13.6) (13.6) (13.6)

Cabinet Dimensions, LxWxH, In. 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2

Cabinet Dimensions, LxWxH, (mm) 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190

Unit Operating Weight, Lbs. (kg) 2945 (1336) 2945 (1336) 3000 (1361)

Unit Shipping Weight, Lbs. (kg) 2885 (1309) 2885 (1309) 2940 (1334)

Nominal Horsepower of each Compressor 7.5 7.5 7.5 9.0 9.0 9.0

Number Of Compressors per Circuit 222222

Oil Charge Per Compressor, Oz. 140 140 140 140 140 140

Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496)

Standard Staging - Circuit #1 in Lead

Standard Staging - Circuit #2 in Lead

Finned Height x Finned Length, In. 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5

Finned Height x Finned Length, (mm) 2032 x

Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2

Pumpdown Capacity @ 90% Full (Ibs) 51 51 51 51 51 51

Pumpdown Capacity @ 90% Full (kgs) (23.1) (23.1) (23.1) (23.1) (23.1) (23.1)

Number Of Fans - Fan Diameter, In. (mm) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712)

Number Of Motors - HP (kW) (3) 4 - 1.0 (0.7) 4 - 1.0 (0.7) 4 - 1.0 (0.7)

Fan And Motor RPM, 60Hz 1140 1140 1140

60 Hz Fan Tip Speed, FPM (m/Sec) 8357 (35.4) 8357 (35.4) 8357 (35.4)

60 Hz Total Unit Airflow, CFM (m3/sec) 34400 (16.2) 34400 (16.2) 34400 (16.2)

Type Tandem Scrolls Tandem Scrolls Tandem Scrolls

Standard 4 Stages 0-25-50-75-100 0-23-50-73-100 0-25-50-75-100

Standard 4 Stages 0-25-50-75-100 0-27-50-77-100 0-25-50-75-100

Coil Face Area,Sq. Ft. 46.4 46.4 46.4 46.4 46.4 46.4

Coil Face Area, (M2) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3)

2121

2032 x

2121

2032 x

2121

2032 x

2121

2032 x

2121

2032 x

2121

IOMM ACZ/AGZ-2 19

Table 10, ACZ 045A - 055A

PHYSICAL DATA ACZ MODEL NUMBER

BASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Unit Capacity @ ARI Conditions (1), Tons (kW) 43.6 (153.2) 48.8 (171.4) 53.5 (188.0)

Add'l Weight If Copper Finned Coils, Lbs. (kg) 445 (200) 445 (200) 445 (200)

COMPRESSORS

CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT

CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING

Maximum Relief Valve Pressure Setting, psig (kPa) 450 (3103) 450 (3103) 450 (3103) 450 (3103) 450 (3103) 450 (3103)

CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE

NOTES:

1. Nominal capacity based on 95°F ambient air and 45°F saturated suction temperature, no refrigerant line loss.

2. Does not include evaporator, suction or liquid line charge. Unit shipped with R-22 holding charge.

3. Units with 1.0 Hp Fan Motors, Uses 1.5 Hp Fan Motors when unit is 380V / 60 Hz and 575V / 60Hz.

STANDARD EFFICIENCY 045AS 050AS 055AS

Number Of Refrigerant Circuits 2 2 2 Unit Operating Charge, R-22, Lbs. (2) 30 30 35 35 35 35 Unit Operating Charge, R-22, (kg) (2) (13.6) (13.6) (15.9) (15.9) (15.9) (15.9)

Cabinet Dimensions, LxWxH, In. 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2

Cabinet Dimensions, LxWxH, (mm) 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190

Unit Operating Weight, Lbs. (kg) 3055 (1386) 3095 (1404) 3145 (1427)

Unit Shipping Weight, Lbs. (kg) 2995 (1359) 3025 (1372) 3075 (1395)

Nominal Horsepower of each Compressor 10.0 10.0 10.0 13.0 13.0 13.0

Number Of Compressors per Circuit 222222

Oil Charge Per Compressor, Oz. 140 140 140 140 140 140

Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496)

Standard Staging - Circuit #1 in Lead

Standard Staging - Circuit #2 in Lead

Finned Height x Finned Length, In. 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5

Finned Height x Finned Length, (mm) 2032 x

Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2

Pumpdown Capacity @ 90% Full (Ibs) 51 51 63 63 63 63

Pumpdown Capacity @ 90% Full (kgs) (23.1) (23.1) (28.6) (28.6) (28.6) (28.6)

Number Of Fans - Fan Diameter, In. (mm) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712)

Number Of Motors - HP (kW) (3) 4 - 1.0 (0.7) 4 - 1.5 (1.1) 4 - 1.5 (1.1)

Fan And Motor RPM, 60Hz 1140 1140 1140

60 Hz Fan Tip Speed, FPM (M/Sec) 8357 (35.4) 8357 (35.4) 8357 (35.4)

60 Hz Total Unit Airflow, CFM (M3/sec) 34400 (16.2) 36800 (17.4) 36800 (17.4)

Type Tandem Scrolls Tandem Scrolls Tandem Scrolls

Standard 4 Stages 0-25-50-75-100 0-22-50-72-100 0-25-50-75-100

Standard 4 Stages 0-25-50-75-100 0-28-50-78-100 0-25-50-75-100

Coil Face Area,Sq. Ft. 46.4 46.4 46.4 46.4 46.4 46.4

Coil Face Area, (M2) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3)

2121

2032 x

2121

2032 x

2121

2032 x

2121

2032 x

2121

2032 x

2121

20 IOMM ACZ/AGZ-2

Electrical Data

Field Wiring

Power Wiring

Internal power wiring to the compressors for single and multiple point option are differ ent. Field wiring must be installed according to unit wiring diagram.

Wiring must comply with all applicable codes and ordinances. Warranty is void if wiring is not in accordance with specifications. Copper wire is required for all power lead terminations at the unit. Aluminum or copper can be used for all other wiring.

AGZ-AM and ACZ units have internal power wiring for single point power connection. A single large power terminal block is provided and wiring within the unit is sized in accordance with the National Electrical Code. A single field supplied fused disconnect is required. An optional factory mounted transformer may be installed.

AGZ-AM remote water chillers and CDE chillers are equipped with a 420W electric heater to provide freeze protection if mounted in locations subject to below freezing temperatures. The heater comes with a receptacle plug which can be used as is, or removed to hard wire to a power supply.

CAUTION

Control Wiring

AGZ-AM chillers are equipped with either a Johnson Controls UNT control or a McQuay MicroTech microprocessor control mounted in the outdoor unit. The control sensor for capacity control must be mounted in the leaving chilled water line in a thermowell provided in the water chiller nozzle. A sensor well is also located in the entering nozzle for use with some control options. The sensor is wired to the control with 30 ft. of cable. If a longer length is required, it is necessary to field splice the cable.

ACZ condensing units are not equipped with a capacity control device and one must be field furnished and installed. Refer to Figure 20. Up to four steps of control are available.

AGZ-AM and ACZ units connected to water chillers must have a flow switch mounted in the chilled water line and wired to the control panel per the field wiring diagram. It is recommended that ACZ units connected to DX air coils have an interlock to prevent compressor operation when there is no air flow.

IOMM ACZ/AGZ-2 21

Electrical Data AGZ-AM Electrical Data ACZ

Table 11, AGZ-030AM - 050AM, ACZ 030A - 055A, 60 Hz, Single Point Power Electrical Data

ACZ

Unit Size

All Electrical Data notes are on page 23

AGZ-AM

Unit Size

035AM

045A 040AM

050A 045AM

055A 050AM

Volts

Minimum

Circuit

Ampacity

(MCA)

208 146 3 1/0 1 1.50 (38) 175 230 146 3 1/0 1 1.50 (38) 175 380 93 3 3 1 1.25 (32) 110 460 76 3 4 1 1.00 (25) 90 575 58 3 6 1 1.00 (25) 70

208 166 3 2/0 1 1.50 (38) 200 230 166 3 2/0 1 1.50 (38) 200 380 111 3 2 1 1.25 (32) 125 460 78 3 4 1 1.00 (25) 90 575 67 3 4 1 1.00 (25) 80

208 187 3 3/0 1 2.00 (51) 225 230 187 3 3/0 1 2.00 (51) 225 380 122 3 1 1 1.25 (32) 150 460 94 3 3 1 1.25 (32) 110 575 76 3 4 1 1.00 (25) 90

208 200 3 3/0 1 2.00 (51) 225 230 200 3 3/0 1 2.00 (51) 225 380 133 3 1 1 1.25 (32) 150 460 104 3 2 1 1.25 (32) 125 575 83 3 4 1 1.00 (25) 100

Field Wire Hub

Quantity

POWER SUPPLY

Wire

Gauge

Quantity

Nominal

Size

Max. Fuse

HACR

Breaker

Size

Table 12, AGZ-AM, ACZ A, 60 Hz, Compressor & Condenser Fan Motor Amp Draw

Rated Load Amps Locked Rotor Amps

ACZ Unit Size

045A 040AM

050A 045AM

055A 050AM

All Electrical Data notes are on page 23

AGZ-AM

Unit Size

035AM

Volts

208 30.5 30.5 4.0 4 17.0 232 232 230 30.5 30.5 4.0 4 17.0 232 232 380 18.6 18.6 3.4 4 14.4 144 144 460 15.8 15.8 2.0 4 8.5 125 125 575 11.6 11.6 2.2 4 10.3 100 100

208 35.2 35.2 4.0 4 17.0 255 278 230 35.2 35.2 4.0 4 17.0 255 278 380 22.8 22.8 3.4 4 14.4 151 151 460 16.5 16.5 2.0 4 8.5 127 127 575 13.7 13.7 2.2 4 10.3 100 100

208 35.2 41.5 5.8 4 23.7 255 350 230 35.2 41.5 5.8 4 23.7 255 350 380 22.8 28.0 3.4 4 14.4 151 195 460 16.5 21.8 2.8 4 10.7 127 158 575 13.7 17.3 2.3 4 11.5 100 125

208 41.5 41.5 5.8 4 23.7 318 350 230 41.5 41.5 5.8 4 23.7 318 350 380 28.0 28.0 3.4 4 14.4 195 195 460 21.8 21.8 2.8 4 10.7 158 158 575 17.3 17.3 2.3 4 11.5 125 125

Compressors Compressors

No.

1 & 3

(Each)

No.

2 & 4

(Each)

Fan

Motors

(Each)

No. Of

Fan

Motors

Fan

Motors

(Each)

Across-The-Line

No.1 & 3

(Each)

No.2 & 4

(Each)

22 IOMM ACZ/AGZ-2

Table 13, AGZ-AM, ACZ A, 60 Hz Single Point Power, Field Wiring Data

ACZ AGZ-AM Power Block Non-Fused Disconnect Switch

Unit Size Unit Volts Terminal Connector Wire Range Terminal Connector Wire Range

Size Amps (Copper Wire Only) Amps (Copper Wire Only)

208 335 # 4 - 400 MCM 225 # 3 - 300 MCM 230 335 # 4 - 400 MCM 225 # 3 - 300 MCM

035AM 380 175 #12 - 2/0 100 #14 - 1/0

460 175 #12 - 2/0 100 #14 - 1/0 575 175 #12 - 2/0 100 #14 - 1/0

208 335 # 4 - 400 MCM 225 # 3 - 300 MCM 230 335 # 4 - 400 MCM 225 # 3 - 300 MCM

045A 040AM 380 175 #12 - 2/0 150 #4 - 4/0

460 175 #12 - 2/0 100 #14 - 1/0 575 175 #12 - 2/0 100 #14 - 1/0

208 335 # 4 - 400 MCM 225 # 3 - 300 MCM 230 335 # 4 - 400 MCM 225 # 3 - 300 MCM

050A 045AM 380 175 #12 - 2/0 150 #4 - 4/0

460 175 #12 - 2/0 100 #14 - 1/0 575 175 #12 - 2/0 100 #14 - 1/0

208 335 # 4 - 400 MCM 225 # 3 - 300 MCM 230 335 # 4 - 400 MCM 225 # 3 - 300 MCM

055A 050AM 380 335 # 4 - 400 MCM 150 #4 - 4/0

460 175 #12 - 2/0 150 #4 - 4/0 575 175 #12 - 2/0 150 #4 - 4/0

All Electrical Data notes are on page 23

Wiring to Standard Wiring to Optional

Electrical Notes

Notes for “Electrical Data Single Point” Power:

1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus

100% of RLA of all other loads in the circuit including the control transformer.

If the control transformer option is furnished, no separate 115V power is required.

If a separate 115V power supply is used for the control circuit, then the wire sizing amps is 10

amps for all unit sizes.

Recommended power lead wire sizes for 3 conductors per conduit are based on 100% conductor

ampacity in accordance with NEC. Voltage drop has not been included. Therefore, it is recommended that power leads be kept short. All terminal block connections must be made with copper (type THW) wire.

“Recommended Fuse Sizes” are selected at approximately 150% to 175% of the largest

compressor RLA, plus 100% of all other loads in the circuit.

“Maximum Fuse or HACR breaker size” is selected at approximately 225% of the largest

compressor RLA, plus 100% of all other loads in the circuit.

The recommended power lead wire sizes are based on an ambient temperature of 86°F (30°C).

Ampacity correction factors must be applied for other ambient temperatures. Refer to the National Electrical Code Handbook.

Must be electrically grounded according to national and local electrical codes.

MCA may vary slightly due to fan motor options such as SpeedTrol, TEFC.

Voltage Limitations:

Within ± 10 percent of nameplate rating.

IOMM ACZ/AGZ-2 23

Notes for “Compressor and Condenser Fan Amp Draw”:

1. Compressor RLA values are for wiring sizing purposes only but do not reflect normal operating

current draw at rated capacity. If unit is equipped with SpeedTrol condenser fan motors, the first motor on each refrigerant circuit is a single phase, 1hp motor, with a FLA of 2.8 amps at 460 volts, 5.6 amps at 208, 230, and 575 volts.

Compressor LRA for reduced inrush start are for the first winding only. If the unit is equipped

with SpeedTrol motors, the first motor is a single phase, 1 hp motor, with a LRA of 7.3 amps at 460 volts, 14.5 amps at 208, 230, and 575 volts.

Notes for “Field Wiring Data”

1. Requires a single disconnect to supply electrical power to the unit. This power supply must

either be fused or use an HACR type circuit breaker.

All field wiring to unit power block or optional non-fused disconnect switch must be copper.

All field wire size values given in table apply to 75°C rated wire per NEC.

Electrical Legend

Figure 9, Electrical Legend

24 IOMM ACZ/AGZ-2

Wiring Diagrams

Figure 10, AGZ-AM, Typical Field Wiring with Global UNT Controller

(

)

(

)

(

)

(

A S

)

(

)

(

E R *

)

IOMM ACZ/AGZ-2 25

Figure 11, AGZ-AM, Typical Field Wiring Diagram with MicroTech Controller

(BY

)

(

)

(BY

)

(BY

(

)

(

A S

)

(

2 1

)

(

)

L .

(

P )

(

(BY

)

4 4

5 4

26 IOMM ACZ/AGZ-2

Figure 12, AGZ-AM, Single-point Connection with FanTrol

IOMM ACZ/AGZ-2 27

Figure 13, AGZ-AM, Single-point Connection with SpeedTrol

28 IOMM ACZ/AGZ-2

Figure 14, AGZ-AM, Unit Control Schematic (UNT)

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Figure 15, AGZ-AM, Staging Schematic (UNT)

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+ 74 hidden pages

McQuay ACZ 045A Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Nomenclature

Inspection

Installation

Handling

Location

Unit Placement

Clearances

Sound Isolation

Service A ccess

Vibration Isolators

Water Piping

Flow Switch

Glycol Solutions

Evaporator Flow and Pressure Drop

Refrigerant Piping

Introduction

Suction Lines

Sizing A Double Riser

Underground Refrigerant Lines

Long Vertical Riser Installation

Liquid Lines

Liquid Lines from Condensers to Receivers

Liquid Line Components

Physical Data

AGZ-AM

ACZ Condensing Units

Electrical Data

Field Wiring

Power Wiring

Control Wiring

Electrical Notes

Notes for “Electrical Data Single Point” Power:

Voltage Limitations:

Notes for “Compressor and Condenser Fan Amp Draw”:

Notes for “Field Wiring Data”

Electrical Legend

Wiring Diagrams