for its content.
Direct Drive Fluid Coolers
Catalog
Cat AFSD-1



Engineered for flexibility and performance.

Direct Drive Fluid Coolers
Type AFS 005 Through AFS 107
Type AFD 046 Through AFD 212
60 Hertz





2
Fluid Coolers
Cat AFSD-1
Table of Contents
Introduction .................................................................................................................. 3
Product Offering........................................................................................................... 3
Design Features............................................................................................................. 4
Selection Procedure ...................................................................................................... 6
Application Adjustment Factors ................................................................................. 7
Performance Data......................................................................................................... 8
Electrical Data ............................................................................................................ 13
Physical Data............................................................................................................... 16
Dimensional Data........................................................................................................ 18
Sound Data.................................................................................................................. 20
Optional Features ....................................................................................................... 20
Installation .................................................................................................................. 21
Specifications .............................................................................................................. 23












2004 McQuay International
Information covers McQuay International products at the time of publication
and we reserve the right to make changes in design and construction at any time without notice.

Document: Cat
AFSD-1
Issue Date:
December 2004
Replaces: PM
AFSD
Manufactured in an ISO Certified Facility Cat AFSD-1
Fluid Coolers
3
Introduction
Our engineers have carefully selected and matched the components to provide superior
performance, long service life, and a wide range of performance selections. Specifically
engineered for outdoor installations, the fluid cooler is constructed of heavy gauge galvanized
steel to resist corrosion in all climates.
Fluid coolers are available in a wide range of sizes. Each model is available with several circuit
options to provide the exact fluid cooler for your requirements.
Our fluid coolers are designed to reduce the cost and time required for installation. Each unit is
completely assembled and tested at the factory. All motor leads are wired to a weatherproof
electrical enclosure providing a single point for field wiring.
Product Offering





Model
AFS - 1140 RPM fan motors, single-row of fans
AFD - 1140 RPM fan motors, double row of fans
Size
Models 005 through 021 1/3 horsepower motors, 1140 RPM fan motors
Models 023 through 212 1 ½ horsepower motors, 1140 RPM fan motors
Voltage Option
42 = 208/230 volts / 60 Hertz / 3-phase
27 = 460 volts / 60 Hertz / 3-phase
37 = 575 volts / 60 Hertz / 3-phase
Special 208 volts / 60 Hertz/ 1-phase, 208/230/380/460 volts/50 Hertz/3-phase
Control Option
A = Fan Cycling Thermostat with Control Transformer (120V)
E = Control Transformer Only (120V)
Y = None (all categories)
Rough Duty Options
A = Totally enclosed motors
B = Sealtite wiring, special water tight conduit system
C = PolyGuard fin coating with totally enclosed motors and Sealtite wiring
D = ElectroFin coating with totally enclosed motors and Sealtite wiring
E = PolyGuard only
F = ElectroFin only
G = Copper fins only (not available on 5 or 6-fan length models)
H = Copper fins with totally enclosed motors and Sealtite wiring
J = Totally enclosed motors and Sealtite wiring
Circuit Feed Option
Equals the number of feeds (from the header to the first pass of tubes) from capacity tables.
AFS
070
42 A C
MODEL SIZE VOLTAGE
OPTION
CONTROL
OPTION ROUGH
DUTY
OPTION
056
CIRCUIT
FEED
OPTION
4
Fluid Coolers
Cat AFSD-1
Design Features
Ease of Installation
The fluid coolers are designed to reduce the cost and
time required for installation. All lifting brackets are
factory-installed, and the legs are designed for quick
installation. 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
switch. A wide variety of fan control panels can be
factory mounted and wired, eliminating the need for a
field-mounted, built-up control panel.
Dynamic Stress Testing
Fan motor and blade assemblies undergo dynamic
stress testing. This testing measures the stress levels
and frequency of vibration of the fan during actual
operation of the cooler. This type of testing helps
provide a design with low vibration levels and long,
trouble-free service life of the air-moving assembly.
Fluid Cooler Housing
Cabinets are heavy-duty construction and designed for outdoor applications. Tube sheets and
all structural members are fabricated from G90 galvanized steel. The remaining cabinet panels
are fabricated from painted G90 galvanized steel for an attractive appearance and corrosion
protection. Sheet metal components and fan guards are 500-hour, B117 salt spray rated.
Coolers have unique internal frame design of heavy-gauge galvanized steel tube sheets and
motor rails. Fan motors are bolted to motor rails for increased reliability and reduced noise and
vibration. Full width fan baffles are provided to increase unit rigidity and prevent windmilling
during fan cycling.
Fluid Cooler Coils
Coils are fabricated with corrugated
aluminum fins with staggered copper tubes
for optimum heat transfer. All units are
pressure tested, dehydrated and pressurized
before shipment.
Floating Tube
Design
AFS 023 through AFD 212 fluid coolers use
the Patented Floating Tube Design (U.S.
Patent No. 5,158,134) to eliminate leaks at
the tube sheets. Additional tubes are added
to the 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 fluid circuit.

Anchor tube
Floating heat
transfer tube Cat AFSD-1
Fluid Coolers
5
The tubes in the fluid circuit are expanded into the fins, but float through oversized holes in
the tube sheets. Tube sheet leaks are virtually eliminated, since the tubes that carry fluid never
come in contact with the tube sheet. (Models AFS 005 through 021 are conventional, non-
floating design.)
Fan Motors
The fan motors are high efficiency, three-phase motors designed for outdoor applications.
Motors have thermal overload protection and fuses and have permanently lubricated ball
bearings with direct drive fans at 1140 rpm, with 830 rpm available as a special. All motors are
factory-wired to a control panel to provide a single point for field wiring. Fan contactors are
definite purpose rated. Fan motors are suitable for 50 Hertz duty.
Fan Blades
Direct drive fan blades are designed to pull air through the cooler coil to help provide 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. Fan blades are aluminum
and riveted to painted steel spider and hubs. Fan blades are statically and dynamically balanced.
Fan Guards
Fan guards are PVC-coated steel for maximum corrosion protection.
Control Panel
All fan motor leads are wired to a weatherproof electrical enclosure for single point field wiring.
Fan Controls
The standard arrangement consists of terminal connections for field supplied and installed
controls to cycle fans in response to the leaving fluid temperature.
An optional fan cycling control is available that consists of a factory mounted and wired
temperature controllers for each fan motor or group of fan motors. They cycle fans in response
to the leaving fluid temperature. Control circuit voltage is 115 volts standard. 24 and 230 volts
are also available.
There is one fan per step on single-row units and one fan per step on double row units except for
the 12 fan unit, which has two sets of two fans each having one controller. The #1 fan on
single-row units and the #1 and #2 fan on two-row units are on all the time.
Fin Spacing
Fin spacing of 12 fins-per-inch has been selected to provide the optimum performance. This fin
spacing allows for easier cleaning and less blockage. Models AFD 178 and AFD 212 have 14
fins-per-inch.
Fin spacing of 8 fins-per-inch is available as an option for locations with severe atmospheric
fouling of coils.
Model Sizes
Sizes are available from 10 gpm through 500 gpm. A wide selection of circuiting maximizes
performance at minimal cost.
Listings
Units are UL listed and either CSA or UL listed for Canada.
The units are acceptable to the New York City Material and Equipment Acceptance Division.
The MEA approval number is MEA 26-74-E. 6
Fluid Co