Mcquay Chiller Cond

Catalog Cat A-C Cond

© 2007 McQuay International

Air-Cooled Condensers

Model ACH 014 - 225

Model ACX 014 - 225

Model ACL 014 - 225

Capacities from 130 MBH to 2225 MBH

R-22, R-134a, R-407C, R-410A

2 Catalog A-C Condensers

Table of Contents

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

Model Description......................................................................................................4

Design Features and Benefits ....................................................................................5

Discharge Pressure Control.......................................................................................7

Options........................................................................................................................9

Selection Procedure..................................................................................................10

Performance Data ....................................................................................................12

ACH .................................................................................................................................................12 ACL..................................................................................................................................................13 ACX .................................................................................................................................................14

Electrical Data..........................................................................................................15

Physical Data ............................................................................................................20

Dimensions................................................................................................................21

Application Data ......................................................................................................22

Fan Cycle Control Panels .................................................................................................................22 Discharge Pressure Fan Cycling.......................................................................................................22 Variable Speed .................................................................................................................................22 Condenser Flooding Control ............................................................................................................22 Sound Data.......................................................................................................................................23

Engineering Guide Specifications...........................................................................24

2007 McQuay International "Illustrations cover the general appearance of McQuay International products at the time of publication and we reserve the right to make changes in design and

construction at anytime without notice"

Manufactured in an ISO Certified Facility

Document Cat A-C Cond

Issue Date March 2007

Replaces Cat ACAQ-1

Catalog A-C Condensers 3

Introduction

Direct Drive Condenser Series The McQuay direct-drive, air-cooled condensers are available in three different models, each

with 24 sizes and numerous options. They are designed to be used with McQuay Model WGS

screw compressors (R-134a) or WGZ scroll compressor chillers (R-22).

Model ACH, providing low-cost, high capacity performance where sound and efficiency are

not major concerns.

Models ACL and ACX, providing moderate cost, excellent capacity and efficiency, coupled

with low sound levels.

Table 1, Model Summary

MODEL FEATURE

ACH ACL ACX

Fan Motor Speed/Dia. (in.) 1140/30 830/30 830/30

Fan Motor Power 1.5 HP 1.5 HP 1.0 HP

Fan Type Standard Quiet Quiet

Cabinet Galvanized (1) Galvanized (1) Galvanized (1)

Venturi Cover Removable Removable Removable

Hinged Option Yes Yes Yes

2-Year Unit Warranty Yes Yes Yes

3-Year Motor Warranty No No No

5-Year Tube Leak Warranty (2) Yes Yes Yes

Sound Level Highest Medium High Medium Low

Capacity Medium High Medium Low Lowest

NOTES: 1. Painted galvanized or aluminum available as an option. 2. Warrants against tube leaks at the tube sheet.

Refrigerants All models can be used with R-22, R-134a, R-407C (450 psi working pressure), and R-

410A (650 psi working pressure). These are the refrigerants used on McQuay equipment

requiring air-cooled condensers.

Model Code

A C H 020 A S

Fan Rows

S=Single

D=Dual

Air-Cooled Condenser

Model Descriptor

H, X, L Vintage

Size: Nominal

Evaporator Tons


Model Description

In addition to the features described in the previous section, each model has unique features

and components that determine its cost/efficiency/sound-level mix.

Model ACL and ACX

Two mid-line units offering a combination of excellent efficiency and sound ratings at a

moderate price.

Fan Motors: 830 rpm fan motors; the ACX having 1.0 HP and the ACL having 1.5 HP

Fan Blades: Both models have patented blade design providing high air flow capacity with

low sound levels. The ACL has a slightly more aggressive design, moving more air for

greater capacity, but with larger motors and a sound level higher by about 3 db.

Galvanized Steel Cabinet: Galvanized steel is standard with painted galvanized or

aluminum as options.

Model ACH

The ACH model offers the most capacity per dollar for applications where efficiency and

sound level are not critical.

Fan Motors: Fan motors are 1140 rpm, 1.5 HP

Fan Blades: Standard fan blades are furnished, providing maximum air flow but with higher

sound levels and lower efficiency.

Galvanized Steel Cabinet: Galvanized steel is standard with painted galvanized or

aluminum as options.

Fan/Circuit Configuration

Fan Rows: All models have either one or dual rows of fans with up to seven fans in a row,

for a total of 14 fans for a dual row unit. The number of fan rows is part of the Model Code

as shown on the previous page.

Refrigerant Circuits: Dual row condensers have two refrigerant circuits, one for each row of

fans and match up with McQuay WGZ and WGS chillers, which have two circuits. The

two refrigerant circuits can be optionally equipped with a factory manifold to make one

refrigerant circuit.

Single row condensers have a single refrigerant circuit and must be used in pairs on

McQuay chillers, each condenser matched to one of the chiller circuits. A pair of single

row units is usually only used in the rare case when space requirements dictate two long

narrow condensers end to end or when they are in separate locations.

The single row configuration allows more ambient air to flow through the coils than does a

unit with a dual row, side-by-side fans and so they often have a little more capacity than a

two row unit with the same number of fans. For a given capacity, two single row

condensers will cost more than a single dual row unit.

Dual fan, two circuit condensers can be manifolded together to form a single refrigeration

circuit.


Design Features and Benefits

Ease of Installation

The condensers are designed to reduce the cost and time

required for installation. All lifting brackets are factory

installed, and the legs are designed for quick installations.

Fan motors are factory wired to a control panel providing a

single point for field wiring. The control panel has a through

the door disconnect. A variety of fan cycling control panels

can be factory mounted and wired to the condenser,

eliminating the need for a field-mounted built-up control

panel.

Dynamic Stress Testing

Fan motor and blade assemblies have undergone dynamic

stress testing. This testing measures the stress levels and

frequency of vibration of the fan during actual operation of

the condenser. This type of testing ensures a design with low

vibration levels and long, trouble-free service life of the air

moving assembly.

Condenser Cabinet

Condenser cabinets are designed for attractive appearance and corrosion protection.

Models ACH, ACX, and ACL are galvanized with painted galvanized or with aluminum

construction as an option.

Condensers have a unique internal frame design consisting of heavy gauge galvanized steel

tube sheets and motor rails. Fan motors are bolted to motor rail for increased reliability,

reduced noise and vibration, and ease of replacement.

Full width fan baffles are provided to increase unit rigidity and prevent windmilling during

fan cycling.

Condenser Coils

The standard condensers use high efficiency coils with corrugated aluminum fins bonded to

staggered copper tubes. Condenser coils are designed to operate with the new generation of

environmentally safe refrigerants.

Sub-coolers

Sub-coolers are pre-piped, integral components. Capacity listings have sub-cooling

incorporated in the ratings, making selection easier and simplifying installation

requirements.

Multi-circuiting

Multi circuiting of the condenser to match the system requirement is available at no extra

cost. Each circuit has its own inlet and outlet connection, labeled to avoid installation

confusion. McQuay WGZ scroll and WGS screw chillers all have two refrigerant circuits.

Lifting lugs are factory mounted for easy rigging and installation.

McQuay condensers have been thoroughly tested to guarantee

high performance.


Floating Tube

All condensers use a Patented Floating Tube Design (U.S.

Patent No. 5,158,134) to eliminate refrigerant leaks at the tube

sheets. Additional tubes are added to the condenser coil.

These tubes are expanded into the aluminum fins and

condenser tube sheets. These anchor tubes support the weight

of the coil, but are not a part of the refrigerant circuit. The

tubes in the refrigerant circuit are expanded into the fins, but

“float” through oversized holes in the tube sheets. Tube sheet

leaks are virtually eliminated, since the tubes which carry

refrigerant never come in contact with the tube sheet.

Fan Motors

Condenser fan motors are high efficiency, three phase

motors designed for outdoor condenser applications.

Motors have thermal overload protection and permanently

lubricated ball bearings. Separate fan motors are designed

for 1140 rpm, 830 rpm or variable speed. All motors are

factory wired to a condenser control panel to provide a

single point for field wiring. Fan motors are available in

460/3/60, 208-230/3/60 or 575/3/60 on the ACH model

only.

Fan Blades

Direct drive fan blades are designed to pull air through the

condenser coil to ensure uniform air distribution over the entire

coil. Fan blades have been selected and laboratory tested for

optimum performance and minimum noise at each operating

speed. Model ACH uses standard fan blades, Models ACX and

ACL use a specially designed blade with lower sound levels.

Fan Guards

Fan guards are PVC coated steel for maximum corrosion

protection. Fan guards have extended height to increase

the distance from the fan blade to the guard, reducing the

noise level of the condenser.

Fin Spacing

Standard condenser fin spacing is 14 fins per inch (fpi). Fin spacing of 10, and 12 fins-per-

inch are optionally available.

Weather Protection

All units have a weatherproof control panel with door-mounted interrupt disconnect switch

and Sealtite® wiring as an option.

Patented design floating tubes dramatically reduce tube sheet

leaks.


Discharge Pressure Control

Proper application of controls is important to a successful installation. McQuay air-cooled

condensers have several control options available.

System Arrangements:

The fan control arrangement for WGZ and WGS chillers are shown in Table 2 and Table 3

on page 8. Condenser pressure control is accomplished by varying the total coil airflow by

either changing the number of operating fans and/or the speed of the “first on, last off” fan.

The number of control stages is shown in the tables. The SpeedTrol option should be used

when unit operation is expected in ambient temperatures between 0°F and 35°F. When

condenser circuits are manifolded, the corresponding controls need to be coupled together.

Control Options:

Four standard control options are available. Other special options can be offered to meet

individual requirements.

1. Standard Control (Code NN)

The standard unit is provided with a contactor for each fan motor. A customer-supplied,

and field-installed control signal from another source is required to energize each contactor

based on the condenser pressure. Field wiring between the compressorized product and

remote condenser is required. Refer to local codes for this wiring. The contactor control

voltage is 115 volts and a transformer is not provided but is an available option.

Typical control logic is to start additional fans as condensing pressure increases. Although

the parameters of the companion refrigeration system dictate the control strategy, it is good

practice to only use this option for operation above ambient air temperatures of 35°F.

Standard Control using Chiller MicroTech Control Staging

The Standard Control (Code Y) or Standard Control with SpeedTrol (Code C) can utilize

the standard pressure sensing capability of a McQuay chiller’s MicroTech controller(s) to

stage the fans. The WGZ chiller has a single microprocessor with eight fan control digital

outputs, four for each refrigerant circuit. The WGS chiller has a separate controller for

each of the two circuits with six fan stages, for a total of twelve for the unit.

Field wiring is required between the chiller MicroTech controller and the fan contactors

located in the condenser. The number of connections will depend on the condenser size and

arrangement as shown in Table 2 or Table 3.

This option uses the standard condenser control included with the condenser and the

standard MicroTech control included with the chiller. Field-supplied interconnecting

wiring is the only cost associated with this arrangement. It does not provide variable speed

for operation below 35°F. Use control option #2 to add Speedtrol for operation from 35°F.

to 0°F.

2. Standard Control with SpeedTrol (Code ST)

This option is identical to the Standard Control (Code = NN) except the “first on, last off”

fan will have a variable speed drive. As the ambient air temperature drops below 35°F, the

fan speed will slow down, reducing condenser air flow, to maintain the minimum allowable

condensing pressure for the companion unit. A control transformer is provided to power the

variable speed drive.

Important: This option does not include a method of starting or cycling the balance of fans

on the condenser. Some means to do so must be supplied, mounted and wired in the field.

The MicroTech controller on McQuay WGZ or WGS chillers can provide this staging

function or some other multi-step controller or multiple pressure switches can be used.


3. Pressure Switch Control with Control Transformer (Code MH)

This option provides direct control of discharge pressure through a series of factory-

mounted and wired pressure switches (designated as FCP-Fan Cycle Pressure Control-on

the wiring diagrams). As the condenser pressure increases, more pressure switches close

and start additional condenser fans. Field wiring between the compressorized product and

the remote condenser is not required. A control power transformer is included for 115-volt

power for the control voltage. Although the parameters of the refrigerant system dictates, it

is good practice to only use this option only for operation above ambient air temperatures of

35°F.

4. Pressure Switch Control with Control Transformer and SpeedTrol (Code VM)

This option is identical to the pressure switch control system described above except with

the addition of variable speed control to the “first on, last off” fan for each circuit. As

ambient temperatures drop below 35°F, the fan speed will be reduced to maintain the proper

minimum condenser pressure.

Table 2, WGZ Fan Staging and Field Wiring Circuits

Fan Stage

1 2 3 4 5 6 7 8 Fans

Circuit #1 Circuit#2

4 1 3 2 4 - -

6 1 3 5 2 4 6

8 1 3 5 7 2 4 6 8

10 1 3 5 7, 9 2 4 6 8, 10

12 1 3 5, 7 9, 11 2 4 6, 8 10, 12

Table 3, WGS Fan Staging and Field Wiring Circuits

Fan Stage Fans

Circuit #1 Circuit#2

4 1 2 - - - - 1 2 - - - -

6 1 2 3 - - - 1 2 3 - - -

8 1 2 3 4 - - 1 2 3 4 - -

10 1 2 3 4 5 - 1 2 3 4 5 -

12 1 2 3 4 5 6 1 2 3 4 5 6

Fan Locations

12 10 8 6 4 2 11 9 7 5 3 1

6 5 4 3 2 1

Electric Panel

Dual Row Units Circuit #1

Circuit #2

Electric Panel

Single Row Units Circuit #1


Options

Controls (See page 7 for details)

Fan Control

1. Standard control (Code NN) is contactors only

2. SpeedTrol (Code ST), variable fan speed on “first on, last off” fan per circuit.

Requires field-supplied fan cycling control on balance of fans or connection to

chiller’s Microtech controller

3. Pressure switch control (Code MH), factory mounted and wired pressure switches to

cycle fans. No speed control. No field control wiring required.

4. Pressure switch control plus FanTrol (Code VM), factory mounted pressure switches

to cycle fans plus SpeedTrol variable speed on “first on, last off” fan. No field

interconnection control wiring required.

Control transformer; factory-mounted for 24-volt or 115-volt secondary with primary the

same as unit main power supply. Provides control circuit power on units with field

supplied staging control.

Unit Perimeter base frame, Condenser legs mount on the frame to spread weight distribution

around the perimeter of the unit.

Extended legs; 20-inch legs are standard. Options available for 30, 36, or 42-inches high.

Cabinet material; galvanized steel is standard, options are aluminum or painted galvanized.

Side access panels; facilitate side access to the unit

Hinged fan deck; facilitates service access to fans and motors

Coils Fins-per-Inch: Standard is 14 fins-per-inch, options are 8, 12 or 14 fins-per-inch. Increasing

the number of fin per inch increases coil capacity, increases unit cost and can increase the

frequency of coil cleaning.

Coil material; Standard fin material is copper, options include:

• Copper fin

• Blackfin, aluminum fin material is precoated with phenolic coating, providing 1000-

hour salt spray protection.

• Electro-Fin, entire coil (fins, tubes, frame) is epoxy dipped and baked. Provides 3000-

hour salt spray protection.

Electrical Power supply; standard is 460/3/60, options are 208-220/3/60 and 575/3/60.

Oversized electrical box

Disconnect switch type; non-fused is standard, fused is optional

Sealtite wiring

Power connection; standard is non-fused disconnect switch. Options are:

• Contactors for each motor

• Fuses for each motor

• Circuit breakers for each motor

• Contactors for paired motors

• Fused for paired motors

• Circuit breakers for paired motors


Selection Procedure

The capacity for air-cooled condensers is based on Total Heat of Rejection (THR) at the

condenser. Total heat of rejection is equal to net refrigeration at the evaporator (compressor

capacity) plus the energy input into the refrigerant by the compressor (heat of compression).

The heat of compression will vary depending on the compressor manufacturer, type of

compressor and the operating conditions of the compressor. Whenever possible, obtain the

heat of compression value from the compressor manufacturer for the specific conditions.

If not available, the THR can be estimated using the following formula:

THR = (Compressor Capacity) X (Heat of Compression Factor in Table 4 or Table 5)

• Table 4 contains heat of compression factors for suction-cooled, hermetic compressors.

• Table 5 contains factors for open drive compressors (non-McQuay applications).

For refrigeration systems beyond the range of Table 4 and Table 5, use the following

equations to estimate THR:

Open Compressors:

THR = Compressor Capacity (BTUH) + (2545) x (Brake Horsepower, BHP)

Suction-Cooled Compressors:

THR = Compressor Capacity (BTUH) + (3413 X KW)

Altitude Correction The compressor capacity is affected by altitude. If the condenser location is above sea

level, a correction is required to the THR, as follows:

THR (altitude) = THR x altitude Correction Factor, Table 6

Selection Example • Compressor capacity: 350,000 Btuh

• Evaporator temperature: +35° F

• Condensing temperature: 120° F

• Ambient temperature 95° F

• Refrigerant: R-22

• Compressor type: Semi-hermetic, suction cooled

• Condenser type: ACH, 1140 rpm

• Condenser altitude: 1,000 feet

Step 1: Estimate Condenser THR From Table 4 for suction-cooled compressors, at +35° F suction and 120°F condensing

temperature, select a heat of compressor factor of 1.305. (interpolated from 30°F and 40°F

THR in BTU = Compressor capacity x Heat of Compression Factor

THR = 350,000 x 1.305 = 456,750 Btuh

Step 2: Correct for Altitude From Table 6 obtain an altitude correction factor of 1.02 for 1,000 feet.

THR (from step 1) x Altitude Correction Factor

456,750 x 1.02 = 465,885 Btuh

Step 3: Calculate Design Condenser T.D. Design Condenser Temperature Difference = condensing Temp – Ambient Temp

Design Condenser T.D. = 120°F - 95°F = 25 degrees F


Step 4: Condenser Selection

Condenser capacities for ACH condensers are located in Table 7. These capacities are

given in MBH/°TD. Convert the THR from step 2 to MBH/°TD by dividing by 1,000 and

the Design TD.

465,885 Btuh / 1000 / 25 = 18.6

Select Model ACH 040A S (single fan row) or ACH 040A D (dual row). The ACH 040A S

will be lower in cost, the ACH 040A D will have a more compact footprint.

Calculate actual TD and condensing temperature: determine the actual TD by dividing the

design THR by the condenser capacity. For the ACH 040A S:

Actual TD = 465.8 / 21.8 = 21.3 degrees F.

Actual condensing temperature is 95°F + 21.3 degrees = 116.3°F.

Table 4, Heat of Compression Factor for Suction Cooled Compressors

Suction Condensing Temperature °F

Temp. °F 90 °F 100 °F 110 °F 120 °F 130 °F

-40° 1.56 1.63 1.72 1.81 1.94

-30° 1.49 1.55 1.62 1.70 1.80

-20° 1.43 1.49 1.55 1.62 1.70

-10° 1.38 1.43 1.49 1.55 1.63

0° 1.34 1.38 1.43 1.49 1.56

5° 1.31 1.36 1.41 1.48 1.55

10° 1.29 1.34 1.39 1.44 1.52

15° 1.26 1.31 1.36 1.41 1.48

20° 1.24 1.28 1.33 1.38 1.44

25° 1.22 1.26 1.31 1.36 1.42

30° 1.20 1.24 1.28 1.33 1.39

40° 1.17 1.20 1.24 1.28 1.33

50° 1.13 1.16 1.20 1.24 1.28

Table 5, Heat of Compression Factor for Open Drive Compressors

Evaporator Condensing Temperature °F

Temp. °F 90 °F 100 °F 110 °F 120 °F 130 °F 140 °F

-30° 1.37 1.42 1.47 — — —

-20° 1.33 1.37 1.42 1.47 — —

-10° 1.28 1.32 1.37 1.42 1.47 —

0° 1.24 1.28 1.32 1.37 1.41 1.47

5° 1.23 1.26 1.30 1.35 1.39 1.45

10° 1.21 1.24 1.28 1.32 1.36 1.42

15° 1.19 1.22 1.26 1.30 1.34 1.40

20° 1.17 1.20 1.24 1.28 1.32 1.37

25° 1.16 1.19 1.22 1.26 1.30 1.35

30° 1.14 1.17 1.20 1.24 1.27 1.32

40° 1.12 1.15 1.17 1.20 1.23 1.28

50° 1.09 1.12 1.14 1.17 1.20 1.24

Table 6, Altitude Correction Factors

Altitude Correction Factors

0 1.00

1,000 1.02

2,000 1.05

3,000 1.07

4,000 1.10

5,000 1.12

6,000 1.15

7,000 1.17


Performance Data

ACH

Table 7, Capacity Data for ACH,

S=Single Fan Row, D=Dual Fan Row

R-22 MBH / 1° TD

Model Number of Fans per Row Optional

8 FPI Optional

10 FPI Optional

12 FPI Standard

14 FPI

ACH 014A S 1 6.4 7.3 8.0 8.6

ACH 016A S 1 7.8 8.7 9.5 10.0

ACH 020A S 2 9.6 10.7 11.7 12.4

ACH 025A S 2 13.1 14.5 15.6 16.3

ACH 030A S 2 15.7 17.1 18.1 19.2

ACH 040A S 3 19.7 21.8 23.4 24.5

ACH 040A D 4 19.2 21.4 23.4 24.8

ACH 050A S 3 23.5 25.7 27.1 29.9

ACH 050A D 2 26.2 29.1 31.2 32.6

ACH 055A S 4 26.2 29.1 31.2 32.6

ACH 060A D 2 31.4 34.2 36.1 38.3

ACH 060A S 4 31.4 34.2 36.1 38.3

ACH 070A S 5 33.6 37.1 39.3 41.3

ACH 080A D 3 39.4 43.6 46.7 48.9

ACH 080A S 5 40.5 44.0 46.1 48.6

ACH 100A D 3 47.0 51.3 54.2 59.8

ACH 100A S 6 48.6 52.8 55.3 58.3

ACH 110A D 4 52.5 58.2 62.3 65.3

ACH 110A S 7 55.4 61.0 64.7 67.5

ACH 130A D 4 62.7 68.4 72.3 76.7

ACH 140A D 5 67.1 74.2 78.5 82.6

ACH 160A D 5 81.0 88.0 92.1 97.2

ACH 200A D 6 97.2 105.6 110.5 116.6

ACH 225A D 7 110.8 121.9 129.5 135.0

Notes:

1. For 50 Hertz applications, multiply values by 0.92 2. For other refrigerants: R-407C and R410A = R-22 R-134a = R-22 x 0.95


ACL Performance Data

Table 8, Capacity Data for ACL


R-22 MBH / 1° TD


8 FPI Optional 10 FPI

Optional 12 FPI

Standard 14 FPI

ACL 014A S 1 5.9 6.7 7.3 7.9

ACL 016A S 1 7.2 8.0 8.6 9.0

ACL 020A S 2 9.1 10.1 11.0 11.7

ACL 025A S 2 12.6 13.9 14.9 15.7

ACL 030A S 2 15.0 16.1 16.8 17.6

ACL 040A D 3 18.1 20.2 22.0 23.3

ACL 040A S 3 19.0 20.9 22.3 23.4

ACL 050A S 4 22.5 24.2 25.2 26.9

ACL 055A S 3 25.3 27.8 29.7 31.2

ACL 050A D 5 25.3 27.8 29.7 31.4

ACL 060A S 2 30.0 32.3 33.6 35.2

ACL 060A D 3 30.0 32.3 33.6 35.2

ACL 070A S 4 32.1 35.5 37.4 39.0

ACL 080A S 2 38.4 41.6 43.4 44.7

ACL 080A D 6 37.9 41.8 44.5 46.9

ACL 100A S 4 46.1 49.9 52.1 53.6

ACL 100A D 4 45.0 48.4 50.4 53.7

ACL 110A S 5 50.5 55.0 58.0 60.2

ACL 110A D 7 50.6 55.7 59.4 62.4

ACL 130A D 4 60.0 64.6 67.2 70.4

ACL 140A D 5 64.2 70.9 74.7 78.0

ACL 160A D 5 76.9 83.1 86.8 89.4

ACL 200A D 6 90.4 99.8 104.1 107.3

ACL 225A D 7 101.1 110.0 116.0 120.3

NOTES:

1. For 50 Hertz applications, multiply values by 0.92 2. For other refrigerants:

R-407C and R410A = R-22 R-134a = R-22 x 0.95


ACX Performance Data Table 9, Capacity Data for ACX


R-22 MBH / 1° TD


8 FPI Optional 10 FPI

Optional 12 FPI

Standard 14 FPI

ACX 014A S 1 5.6 6.4 7.0 7.4

ACX 016A S 1 6.8 7.5 8.1 8.4

ACX 020A S 2 8.8 9.8 10.6 11.3

ACX 025A S 2 12.0 13.1 13.8 14.8

ACX 030A S 2 14.0 15.1 15.7 16.0

ACX 040A D 3 17.5 19.6 21.2 22.5

ACX 040A S 3 18.0 19.7 20.8 21.8

ACX 050A S 4 21.0 22.7 23.5 25.3

ACX 055A S 3 24.1 26.3 27.7 29.3

ACX 050A D 5 24.1 26.2 27.7 29.7

ACX 060A S 2 27.9 30.3 31.3 32.0

ACX 060A D 3 27.9 30.3 31.3 32.0

ACX 070A S 4 30.1 32.8 34.6 36.7

ACX 080A S 2 34.9 37.8 39.2 40.1

ACX 080A D 6 36.1 39.4 41.5 43.7

ACX 100A S 4 41.9 45.4 47.0 48.1

ACX 100A D 4 41.9 45.4 47.0 50.6

ACX 110A S 5 47.7 52.0 54.8 56.1

ACX 110A D 7 48.1 52.5 55.4 58.6

ACX 130A D 4 55.9 60.6 62.7 64.1

ACX 140A D 5 60.1 65.6 69.2 73.5

ACX 160A D 5 69.9 75.7 78.3 80.1

ACX 200A D 6 83.8 90.8 94.0 96.1

ACX 225A D 7 95.5 104.1 109.6 112.2

NOTES

1. For 50 Hertz applications, multiply values by 0.92 2. For other refrigerants:

R-407C and R410A = R-22 R-134a = R-22 x 0.95


Electrical Data

Table 10, ACH Electrical Data, S = Single Fan Row, D = Dual Fan Row

208-230/3/60 460/3/60 575/3/60

Model Number

of Rows

Number of Fans per

Row FLA MCA MOPD FLA MCA MOPD FLA MCA MOPD UNIT kW

ACH 014A S 1 1 7.0 15.0 25 3.5 15.0 15 2.8 15.0 15 1.9

ACH 016A S 1 1 7.0 15.0 25 3.5 15.0 15 2.8 15.0 15 1.9

ACH 020A S 1 2 14.0 20.0 35 7.0 15.0 15 5.6 15.0 15 3.8

ACH 025A S 1 2 14.0 20.0 35 7.0 15.0 15 5.6 15.0 15 3.8

ACH 030A S 1 2 14.0 20.0 35 7.0 15.0 15 5.6 15.0 15 3.8

ACH 040A S 1 3 21.0 22.8 40 10.5 15.0 20 8.4 15.0 15 5.8

ACH 050A S 1 3 21.0 22.8 40 10.5 15.0 20 8.4 15.0 15 5.8

ACH 055A S 1 4 28.0 29.8 45 14.0 15.0 20 11.2 15.0 15 7.7

ACH 060A S 1 4 28.0 29.8 45 14.0 15.0 20 11.2 15.0 15 7.7

ACH 070A S 1 5 35.0 36.8 50 17.5 20.0 25 14.0 15.0 20 9.6

ACH 080A S 1 5 35.0 36.8 50 17.5 20.0 25 14.0 15.0 20 9.6

ACH 100A S 1 6 42.0 43.8 60 21.0 21.9 30 16.8 20.0 25 11.5

ACH 110A S 1 7 49.0 50.8 70 24.5 25.4 35 19.6 20.3 25 13.5

ACH 040A D 2 2 28.0 29.8 45 14.0 15.0 20 11.2 15.0 15 7.7

ACH 050A D 2 2 28.0 29.8 45 14.0 15.0 20 11.2 15.0 15 7.7

ACH 060A D 2 2 28.0 29.8 45 14.0 15.0 20 11.2 15.0 15 7.7

ACH 080A D 2 3 42.0 43.8 60 21.0 21.9 30 16.8 20.0 25 11.5

ACH 100A D 2 3 42.0 43.8 60 21.0 21.9 30 16.8 20.0 25 11.5

ACH 110A D 2 4 56.0 57.8 70 28.0 28.9 35 22.4 23.1 30 15.4

ACH 130A D 2 4 56.0 57.8 70 28.0 28.9 35 22.4 23.1 30 15.4

ACH 140A D 2 5 70.0 71.8 90 35.0 35.9 45 28.0 28.7 35 19.2

ACH 160A D 2 5 70.0 71.8 90 35.0 35.9 45 28.0 28.7 35 19.2

ACH 200A D 2 6 84.0 85.8 100 42.0 42.9 50 33.6 34.3 40 23.1

ACH 225A D 2 7 98.0 99.8 110 49.0 49.9 50 39.2 39.9 45 26.9

NOTE: MOPD = Motor Overload Protection Device.


Table 11, ACL Electrical Data, S = Single Fan Row, D = Dual Fan Row

208-230/3/60 460/3/60 575/3/60 Model

Number of

Rows

Number of Fans per Row

FLA MCA MOPD FLA MCA MOPD FLA MCA MOPD

UNIT kW

ACL 014A S 1 1 6.6 15.0 25 3.3 15.0 15 2.6 15.0 15 1.4

ACL 016A S 1 1 6.6 15.0 25 3.3 15.0 15 2.6 15.0 15 1.4

ACL 020A S 1 2 13.2 15.0 30 6.6 15.0 15 5.2 15.0 15 2.7

ACL 025A S 1 2 13.2 15.0 30 6.6 15.0 15 5.2 15.0 15 2.7

ACL 030A S 1 2 13.2 15.0 30 6.6 15.0 15 5.2 15.0 15 2.7

ACL 040A S 1 3 19.8 21.5 35 9.9 15.0 15 7.8 15.0 15 4.1

ACL 050A S 1 4 19.8 21.5 35 9.9 15.0 15 7.8 15.0 15 4.1

ACL 055A S 1 3 26.4 28.1 45 13.2 15.0 20 10.4 15.0 15 5.4

ACL 060A S 1 2 26.4 28.1 45 13.2 15.0 20 10.4 15.0 15 5.4

ACL 070A S 1 4 33.0 34.7 50 16.5 20.0 25 13.0 15.0 20 6.8

ACL 080A S 1 2 33.0 34.7 50 16.5 20.0 25 13.0 15.0 20 6.8

ACL 100A S 1 4 39.6 41.3 50 19.8 20.6 25 15.6 20.0 20 8.1

ACL 110A S 1 5 46.2 47.9 60 23.1 23.9 30 18.2 20.0 25 9.5

ACL 040A D 2 3 26.4 28.1 45 13.2 15.0 20 10.4 15.0 15 5.4

ACL 050A D 2 5 26.4 28.1 45 13.2 15.0 20 10.4 15.0 15 5.4

ACL 060A D 2 3 26.4 28.1 45 13.2 15.0 20 10.4 15.0 15 5.4

ACL 080A D 2 6 39.6 41.3 50 19.8 20.6 25 15.6 20.0 20 8.1

ACL 100A D 2 4 39.6 41.3 50 19.8 20.6 25 15.6 20.0 20 8.1

ACL 110A D 2 7 52.8 54.5 70 26.4 27.2 35 20.8 21.5 25 10.8

ACL 130A D 2 4 52.8 54.5 70 26.4 27.2 35 20.8 21.5 25 10.8

ACL 140A D 2 5 66.0 67.7 80 33.0 33.8 40 26.0 26.7 30 13.5

ACL 160A D 2 5 66.0 67.7 80 33.0 33.8 40 26.0 26.7 30 13.5

ACL 200A D 2 6 79.2 80.9 90 39.6 40.4 45 31.2 31.9 35 16.2

ACL 225A D 2 7 92.4 94.1 110 46.2 47.0 50 36.4 37.1 40 18.9

NOTE: MOPD = Motor Overload Protection Device.


Table 12, ACX Electrical Data, S = Single Fan Row, D = Dual Fan Row

208-230/3/60 460/3/60 Model

Number of

Rows

Number of Fans per Row

FLA MCA MOPD FLA MCA MOPD

UNIT kW

ACX 014A S 1 1 4.8 15.0 15 2.4 15.0 15 1.1

ACX 016A S 1 1 4.8 15.0 15 2.4 15.0 15 1.1

ACX 020A S 1 2 9.6 15.0 20 4.8 15.0 15 2.2

ACX 025A S 1 2 9.6 15.0 20 4.8 15.0 15 2.2

ACX 030A S 1 2 9.6 15.0 20 4.8 15.0 15 2.2

ACX 040A S 1 3 14.4 20.0 25 7.2 15.0 15 3.4

ACX 050A S 1 4 14.4 20.0 25 7.2 15.0 15 3.4

ACX 055A S 1 3 19.2 20.4 30 9.6 15.0 15 4.5

ACX 060A S 1 2 19.2 20.4 30 9.6 15.0 15 4.5

ACX 070A S 1 4 24.0 25.2 35 12.0 15.0 15 5.6

ACX 080A S 1 2 24.0 25.2 35 12.0 15.0 15 5.6

ACX 100A S 1 4 28.8 30.0 40 14.4 20.0 20 6.7

ACX 110A S 1 5 33.6 34.8 45 16.8 20.0 20 7.8

ACX 040A D 2 3 19.2 20.4 30 9.6 15.0 15 4.5

ACX 050A D 2 5 19.2 20.4 30 9.6 15.0 15 4.5

ACX 060A D 2 3 19.2 20.4 30 9.6 15.0 15 4.5

ACX 080A D 2 6 28.8 30.0 40 14.4 20.0 20 6.7

ACX 100A D 2 4 28.8 30.0 40 14.4 20.0 20 6.7

ACX 110A D 2 7 38.4 39.6 50 19.2 20.0 25 8.9

ACX 130A D 2 4 38.4 39.6 50 19.2 20.0 25 8.9

ACX 140A D 2 5 48.0 49.2 60 24.0 24.6 30 11.2

ACX 160A D 2 5 48.0 49.2 60 24.0 24.6 30 11.2

ACX 200A D 2 6 57.6 58.8 70 28.8 29.4 35 13.4

ACX 225A D 2 7 67.2 68.4 80 33.6 34.2 40 15.6

NOTES: 1. MOPD = Motor Overload Protection Device 2. Model ACX units are not available in 575 volts.


Figure 1, Typical Twelve Fan, ACD/AQD, Wiring With Fan Pressure Switch Control

115

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M8

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M10

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L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3

L1

L2

L3C

3

C4

C5

C6

C7

C8

C9

C10

C11

C12

F12

F11

F10

F9

F8

F7

F6

F5

F4

F3

L1

L2

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T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3

L1

L2

L3

T1

T2

T3


Physical Data

Table 13, Physical Properties of Models ACH, ACL, ACX

ACH ACL ACX Model Size Fans

/Row CFM

Conn (in.)

Weight (lbs)

Fans /Row

CFM Conn (in.)

Weight (lbs)

Fans /Row

CFM Conn (in.)

Weight (lbs)

014 S 1 9,900 1 3/8 330 1 8,400 1 3/8 330 1 7,600 1 3/8 330

016 S 1 9,500 1 3/8 360 1 8,000 1 3/8 360 1 7,300 1 3/8 360

020 S 2 20,500 1 3/8 580 2 17,500 1 3/8 580 2 15,900 1 3/8 580

025 S 2 19,800 1 5/8 630 2 16,700 1 5/8 630 2 15,200 1 5/8 630

030 S 2 19,000 2 1/8 680 2 16,100 2 1/8 680 2 14,700 2 1/8 680

040 S 3 29,700 2 1/8 930 3 25,100 2 1/8 930 3 22,900 2 1/8 930

050 S 3 28,500 2 1/8 1000 3 24,100 2 1/8 1000 3 22,000 2 1/8 1000

055 S 4 38,600 2 1/8 1210 4 32,800 2 1/8 1210 4 29,800 2 1/8 1210

060 S 4 37,000 2 5/8 1310 4 31,200 2 5/8 1310 4 28,400 2 5/8 1310

070 S 5 48,300 2 5/8 1510 5 41,000 2 5/8 1510 5 37,300 2 5/8 1510

080 S 5 46,200 2 5/8 1640 5 39,100 2 5/8 1640 5 35,500 2 5/8 1640

100 S 6 55,400 2 5/8 1950 6 46,900 2 5/8 1950 6 42,600 2 5/8 1950

110 S 7 64,700 (2)2 5/8 2240 7 54,700 (2)2 5/8 2240 7 49,700 (2)2 5/8 2240

040 D 2 41,000 (2)1 3/8 1240 2 35,000 (2)1 3/8 1240 2 31,700 (2)1 3/8 1240

050 D 2 39,600 (2)1 5/8 1340 2 33,500 (2)1 5/8 1340 2 30,500 (2)1 5/8 1340

060 D 2 38,100 (2)2 1/8 1440 2 32,100 (2)2 1/8 1440 2 29,300 (2)2 1/8 1440

080 D 3 59,400 (2)2 1/8 1990 3 50,200 (2)2 1/8 1990 3 45,700 (2)2 1/8 1990

100 D 3 57,100 (2)2 1/8 2140 3 48,200 (2)2 1/8 2140 3 44,000 (2)2 1/8 2140

110 D 4 77,200 (2)2 1/8 2630 4 65,600 (2)2 1/8 2630 4 59,700 (2)2 1/8 2630

130 D 4 73,900 (2)2 5/8 2830 4 62,500 (2)2 5/8 2830 4 56,800 (2)2 5/8 2830

140 D 5 96,500 (2)2 5/8 3290 5 82,000 (2)2 5/8 3290 5 74,600 (2)2 5/8 3290

160 D 5 92,400 (2)2 5/8 3540 5 78,100 (2)2 5/8 3540 5 71,000 (2)2 5/8 3540

200 D 6 110,900 (2)2 5/8 4230 6 93,700 (2)2 5/8 4230 6 85,200 (2)2 5/8 4230

225 D 7 129,400 (4)2 5/8 4910 7 109,300 (4)2 5/8 4910 7 99,400 (4)2 5/8 4910


Dimensions (See Table 13 for Connection Sizes)


Application Data

Fan Cycle Control Panels • Fan cycling panels are available to cycle fans on condensing pressure or interface with

customers controls.

• All fans are cycled with contactors. Fans cycle separately with one contactor per fan,

but may have more than one contactor (fan) per control step.

• Standard control circuit voltage is 115 volts. Control circuits with 24 or 230 volts are

available on request.

• Control circuits are factory wired to a control circuit terminal board for convenient

single point field wiring.

• Standard control circuits require an external power supply for powering control circuit

(by others). A control circuit transformer is available on condensers as a factory

mounted option to provide power to the control circuit.

Discharge Pressure Fan Cycling Condenser fans can be controlled by pressure switches which monitor condenser pressure.

Pressure fan cycling is ideal for those condensers which see a significant change in

condenser load. Since the controls sense condensing pressure, they can cycle fans at any

ambient temperature, in response to a change in condensing pressure.

Variable Speed Condenser head pressure control is provided by varying the air flow through the condenser

by changing the RPM of the condenser fan. The fan motor next to the header end of the

condenser is the variable speed fan. The remainder of the fans are constant speed and are

cycled separately using pressure control or customer input signal.

On condensers with two rows of fans, two variable speed fans are provided (one per circuit)

and the remainder of the fans are constant speed. The variable speed control package

consists of a special variable speed motor (1140 RPM, single phase) and an electronic

speed control which controls the speed of the motor in response to condensing pressure.

Fan motor, speed control and all related components are all factory mounted and wired.

Variable speed control provides more even system operation than pure fan cycling.

Condenser Flooding Control Back-flooding the condenser with liquid refrigerant, controlled by a field-supplied back-

flooding valve, and using refrigerant from a field-supplied receiver, can be used effectively

to control compressor discharge pressure. This technique reduces the condenser’s effective

condensing surface.

Using fan control in conjunction with back-flooding will greatly reduce the extra amount of

refrigerant required to flood the condenser. The extra quantity of refrigerant required with

either method is given in installation manual, IOMM A-C Cond


Sound Data

Table 14, Sound in Dba for ACH Models

Feet from Edge of Unit Fan Configuration 5 10 20 40

1 X 2 77 74 69 65

1 X 3 79 76 71 67

1 X 4 80 77 72 68

1 X 5 81 78 73 69

1 X 6 82 79 74 70

1 x 7 83 80 75 71

2 X 2 79 76 71 67

2 X 3 81 78 73 69

2 X 4 82 79 74 70

2 X 5 83 80 75 71

2 X 6 84 81 76 72

2 x 7 85 82 77 73

Table 15, Sound in Dba for ACL and ACX Models

Feet from Edge of Unit Fan Configuration 5 10 20 40

1 X 2 69 65 61 56

1 X 3 71 67 63 58

1 X 4 72 68 64 59

1 X 5 73 69 65 60

1 X 6 74 70 66 61

1 x 7 75 71 67 62

2 X 2 71 67 63 58

2 X 3 73 69 65 60

2 X 4 74 70 66 61

2 X 5 75 71 67 62

2 X 6 76 72 68 63

2 x 7 77 73 69 64


Engineering Guide Specifications

Furnish and install as specified and as shown on plans McQuay Model ____ air-cooled

condenser(s), arranged for vertical air flow. Condenser shall be multiple fan design and

shall perform in accordance with {following schedule} {schedule on plan}.

Each condenser shall consist of cabinet, condenser coil, multiple direct drive propeller fans

driven by independent fan motors, fan guards and mounting legs. All fan motors shall be

factory wired to a common electrical junction box.

Condenser coil - The condenser shall be constructed of seamless copper tubes on a

staggered tube pattern. Tubes shall be mechanically expanded into continuous, corrugated,

rippled {aluminum}{copper} plate type fins for permanent metal-to-metal contact. The fins

shall have full depth fin collars completely covering the copper tube.

The coil shall be "floating tube type" with refrigerant carrying tubes not touching the

galvanized end plates. The coil shall be supported by non-refrigerant carrying copper tubes

that are expanded into the coil.

Heavy wall copper headers shall have dimpled stub tubes from the coil and a beaded hole

for the large connection tube, both items to assure good brazing surface and joint strength.

Headers to be field piped to prevent excessive vibration from discharge gas pulsations.

Coil to have an integral subcooler pre-piped from the condenser outlet. Subcooler to be

rated at 10 degrees of subcooling at a 25 degree temperature difference between the

ambient and the condensing temperature.

Coils shall have a working pressure of 400 psig. A field supplied 450 psig relief device, one

per circuit, is required on units up to two circuits.

Coils shall be factory leak tested, dehydrated and connection ends spun closed. Unit shall

be shipped under pressure with a dry air or nitrogen holding charge.

Cabinet - The cabinet shall be beige pre-painted G90 galvanized steel. Motors shall be

supported by 11 gauge galvanized steel rail fastened to the coil center and end supports.

Each fan section shall be in an individual compartment, separated from other fan sections

by cabinetry.

All legs and lifting brackets shall be 11 gauge galvanized steel.

Motors - Motors shall be open drip proof motor with internal overloads.

Fan and Fan Guard - Fans shall have heavy gauge aluminum blades with painted steel

spider. Fan guards shall be PVC coated steel.

Electrical - Unit shall have weatherproof electric control panel with factory mounted door

interrupt switch. Control voltage shall be 120 volts with individual contactors and fuse

protection for each motor.


Head Pressure Control- Provide a means of fan cycling to maintain head pressure down to

____°F. This shall be automatic in operation without daily or seasonal adjustment.

Controls shall be factory-mounted and wired in a weatherproof electric panel. Control shall

be as follows and would be one of three options:

A. Terminal board to individual contactor for field connection to the chiller MicoTech

controller that cycles fans based on load requirements and ambient temperature.

B. Pressure control for each contactor cycling individual motors.

C. Variable speed motor controlled by sensing head pressure to modulate speed of header

fan in relation to changing pressures in combination with A or B

Options to be Supplied

• Cabinet Material; aluminum or painted galvanized in lieu of standard galvanized

• Extended legs; 30-inch, 36-inch, or 42-inch in lieu of standard 20-inch legs

• Hinged Fan Deck

• Coil Material; standard fin material is copper, options include:

• Copper fin

• Blackfin, aluminum fin material is precoated with phenolic coating, providing

1000-hour salt spray protection.

• Electro-Fin, entire coil (fins, tubes, frame) is epoxy dipped and baked. Provides

3000-hour salt spray protection.

• Power Connections in lieu of standard non-fused disconnect switch

• Contactors or fuses or circuit breakers for each motor

• Contactors or fuses or circuit breakers for each pair of motors


Notes

(800) 432-1342….www.mcquay.com CAT A-C Cond (3-07)

This document contains the most current product information as of this printing. For the most up-to-date product information, please go to www.mcquay.com.

Mcquay Chiller Cond

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