Munters ATLAS 74 User manual

1© Munters Corporation, July 2021 QM1095r1
Instruction Manual
ATLAS 74 Fan
Models: ATS743F3CT-E • ATS743F3CT-P
Munters
ATLAS 74
74” Exhaust Fan

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Munters ATLAS 74 Fan
Instructions for Use and Maintenance
Thank You:
Thank you for purchasing an ATLAS 74 Fan. Munters equipment is designed to be the highest performing, highest
quality equipment you can buy. With the proper installation and maintenance it will provide many years of service.
Please Note:
To achieve maximum performance and insure long life from your Munters product it is essential that it be installed
and maintained properly. Please read all instructions carefully before beginning installation.
Warranty:
For Warranty claims information see the “Warranty Claims and Return Policy” form QM1021 available from the
Munters Corporation office at 1-800-227-2376 or by e-mail at [email protected].
Conditions and Limitations:
• Products and Systems involved in a warranty claim under the “Warranty Claims and Return Policy” shall have
been properly installed, maintained and operated under competent supervision, according to the instructions
provided by Munters Corporation.
• Malfunction or failure resulting from misuse, abuse, negligence, alteration, accident or lack of proper installation
or maintenance shall not be considered a defect under the Warranty.

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Index
Chapters Page
1. Unpacking the Equipment 4
1.1 Parts List 4
1.2 Fan Dimensions 5
1.3 Fan Spacing 6-7
2. Installation Instructions 8-12
2.1 Installation 8
2.2 Cone Installation 11
2.3 PT Shutter 14
2.4 Shutter Wind Kit 15-16
3. Electrical Wiring 17
4. Operation 19
5. Maintenance 20-21
6. Winterizing 22
6.1 Winterizing 22
6.2 Winter Weather Protection 22
7. Troubleshooting 23
8. Exploded View and Parts List 24-25

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1.1 Parts List
Unpacking the Equipment 1.
[A]
[B]
[C]
[D]
[E]
Each Fan includes:
1 – Belt Drive Fan
4 – Cone Sections, PL
2 – Guard Sections, CTD
1 – Shutter
2 – Shutter Wind Bracket, GZ
1 – Shutter Wind Pipe, GZ
1 – Hardware Package as follows:
HP1162– Atlas 74
ID Qty. Cat. No. Description
[A] 28 KS1167 5⁄16”-18 x 1.25” SRTD Flange Head Bolt, ZP
[B] 32 KN0706 5⁄16”-18 SRTD Flange Nut, ZP
[C] 12 KW3011 5⁄16” x 1¼”O.D. Flat Washer, SS
Before beginning installation, check the overall condition of the equipment. Remove packing materials, and examine all
components for signs of shipping damage. Any shipping damage is the customer’s responsibility and should be reported
immediately to your freight carrier. Fan is shipped complete with all accessories.
Each FH1890 Optional Lift Bracket includes:
1 – Left Lift Bracket, PWDCTD
1 – Right Lift Bracket, PWDCTD
1 – Hardware Package as follows:
HP1891 - for FH1890
ID Qty. Cat. No. Description
[D] 8 KS1180 3⁄8”-16 x 1.5” Flange Head Bolt, ZP
[E] 8 KN0705 3⁄8”-16 SRTD Flange Nut, ZP

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1.2 Fan Dimensions
Unpacking the EquipmentChapter 1
Fan Specifications:
Hertz: 60
Voltage: 208-240/480VAC
Phase: 3
Hertz: 50
Voltage: 190/380VAC
Phase: 3
Weight: 400 lbs. [182 Kg]
FAN
DIA. A B C D E F G H J K-Dia. WALL OPENING
(I.D., framed)
74” 51⁄2”21
1⁄2”44 1⁄2” 89” 89” 137⁄8”35 3⁄4”60 3/16” 2⁵⁄₁₆” 853⁄8” 85”W 85”H
FRONT VIEWSIDE VIEW
H
F
J
K - Dia.
A
A
D
B
A
E
D
A
B
C
BB
C
G
4¾"

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Unpacking the EquipmentChapter 1
1.3 Fan Spacing
Elevation View
Top View
98" Center-to-Center
98" Center-to-Center
¼"
3¾"
When determining fan spacing/fan layout, keep in mind that the fan requires ¼" clear space from the mounging flange so the
Shutter Clips have room to rotate, to allow the shutter to be removed and reinstalled in the fan without interference. Also, the
sides of the fan also require 3¾" clearance for the Wind Kit Bracket to be installed. If the fans are to be installed side-by-side
with the Wind Kit Brackets adjacent to each other, the minimum fan spacing is 98" Center-to-Center. See Figure Below.

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Unpacking the EquipmentChapter 1
Elevation View
Top View
93" Center-to-Center
93" Center-to-Center
¼"
3¾"
If the fans are to be installed closer, then the Wind Kit Brakcet for one fan should be offset 6" up or down from the previous fan,
then the minimum fan spacing is 93" Center-to-Center. See Figure Below.

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Installation Instructions 2.
2.1 Installation
Figure 1B
Figure 1A
4x4 Post or 2x Treated Framing
W.
(See Chart
on Page 5)
Step 1
Construct the framed opening to correct size according to the Chart on Page 5. The frame should be
constructed of 4x4 Treated Posts or double 2x Treated Studs. 2 fans can fit between Columns that are
20’O.C., and 3 fans can fit between Columns that are 25’ or 30’ O.C.
See Figure 1A, 1B and 1C.
H.
(See Chart
on Page 5)
Building Column
Concrete Stem Wall
Building Columns - 20’-0” O.C.
4x4 Post or 2x Treated Framing
W.
(See Chart
on Page 5)
H.
(See Chart
on Page 5)
Building Column
Concrete Stem Wall
Building Columns - 25’-0” O.C.

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Installation InstructionsChapter 2
Figure 1C
4x4 Post or 2x Treated Framing
W.
(See Chart
on Page 5)
H.
(See Chart
on Page 5)
Building Column
Concrete Stem Wall
Building Columns - 30’-0” O.C.
Step 2
An optional Lift Bracket Kit is available to be able to lift fan into the framed opening. If Lift Bracket Kit
was purchased attach each Lift Bracket to Bearing Bracket and Strut using (4) Bolts [D] and Nuts [E].
See Figure 2. Once fan has been installed in wall Lift Bracket can be removed and installed in next
fan for installation.
Bolt [D]
Left Lift Bracket
Nut [E]
Bearing Bracket
Right Lift Bracket
Bolt [D]
Nut [E]
Figure 2

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Installation InstructionsChapter 2
Step 3A
Insert fan into the framed opening from the inside. While holding fan tight to framing, fasten top of fan
with (5) Mounting Screw/Bolt (not provided).
See Figure 3A .Next, fasten bottom of fan, then both
sides with (5) Mounting Screw/Bolt (not provided) per side. Install flashing around opening tight to fan
and caulk around fan to seal.
Figure 3B Wall Framing
2" Minimum Framing for fan, Bottom
Wall Opening (See Chart on Page 5)
4" Minimum Framing for
fan, Top and Sides
Wall Framing
Figure 3A
OUTSIDEINSIDE
Mounting Screw/Bolt
(not provided)
Step 3B
If fan needs to be mounted, so that shutter does not stick into building then frame fan as shown in Figure 3B. Top
and sides require 4" minimum and bottom requires 2" minimum.
Note:
Once Fan is installed in wall,
remove Lifting Brackets from
Fan and install in next Fan
for installation.

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Installation InstructionsChapter 2
Figure 4A
Figure 5A
Bolt [A] Outer Hole
Step 4
Place all 4 cone sections on a flat surface with tabs from one facing slots of the next. See Figure 4A. Curl
up tab end of first cone section and insert tabs up into slots in the next cone section. A mallet may be
needed to seat slots over tabs completely. See Figure 4B. Repeat this step until all 4 cone sections are
connected and laying flat.
2.2 Cone Installation
Figure 4B
Step 5A
Fasten each of the joints in the single outer hole using (1) Bolt [A] and Nut [B], with the nut on the side with
the tabs. At the inner pair of holes of each joint fasten using (1) Bolt [A] and Nut [B] with the bolt head on
the side with the tabs. See Figure 5A.
Nut [B]
Bolt [A]
Inner Hole
Nut [B]

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Figure 5B
Figure 6
Installation InstructionsChapter 2
Step 5B
Stand cone sections on end and curl ends around to form cone so that the nuts are outside and tabs on inside.
Insert remaining tabs into slots so tabs are inside cone and fasten final joint using (1) Bolt [A] and Nut [B], with
nut on inside of cone. At the inner pair of holes fasten using (1) Bolt [A] and Nut [B] with bolt head on inside of
cone. See Figure 5B. Leave all bolts and nuts loose at this time.
Bolt [A]
Nut [B]
Bolt [A]
Nut [B]
Step 6
Install cone onto fan by putting cone over fan orifice and line up inner holes of cone with holes in fan orifice.
Fasten cone to fan orifice using (12) Bolt [A], Washer [C] and Nut [B] with bolt and washer on inside of fan
orifice and nut on outside of cone. See Figure 6.
Bolt [A]
Nut [B]
Washer [C]
Hole in Fan Orifice

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Installation InstructionsChapter 2
Step 8
Insert guard into cone with the eyelets facing you. Install eyelets over (4) Bolts already installed at joints in cone
and fasten with Nut [B]. Secure (8) remaining eyelets using Bolt [A] and Nut [B]. See Figure 8.
Figure 8
Step 7
Find the 2 Guard Sections and line the 2 of them up with the eyelets both facing the same direction. Then
secure the guard sections together by wrapping the wire loop on each guard section around center wire of
opposite guard section. See Figure 7.
Figure 7
Wire Loop
Bolt [A]
Nut [B]
Previously installed -
Bolt and Nut
Nut [B]

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Installation InstructionsChapter 2
Figure 9
PT Shutter
Step 10
Fasten shutter in place by rotating the side and top shutter clips over the shutter flanges.
See Figure 10.
Figure 10
2.3 PT Shutter Installation
Fixed Bottom Shutter Clip
Note:
PT Shutter extends into room
2 5⁄16” from back of fan.
Step 9
Insert PT Shutter into fan by sliding the bottom flange of shutter into
bottom shutter clips and pressing shutter inward.
See Figure 9.
Position to install/remove Shutter
Position to hold Shutter in place
¼"

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Step 11
Mount one Wind Kit Bracket on each side of fan, 3'-3" above the bottom flange of fan. The opening in
the 'U' slot should be facing up and each Bracket should be mounted in same direction.
See Figure 11A.
Fasten Brackets in place using (2) Lag Screws (not provided). See Figure 11B.
Installation InstructionsChapter 2
3'-3"
3'-3"
Figure 11A
Figure 11B
Lag Screw
(not provided)
Wind Kit Bracket
2.4 Shutter Wind Kit Installation

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Installation InstructionsChapter 2
Step 12
Slide the Wind Kit Pipe into the hole in the Left Wind Kit Bracket until it stops at the other side of the
Bracket and set Pipe down into slot in opposite Bracket.
See Figure 12A. For the completed Wind Kit
installation See Figure 12B.
Figure 12A
Figure 12B

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Electrical Wiring 3.
All wiring should be installed in accordance with National, State, and Local electrical codes. Fans used to ventilate
livestock buildings or other rooms where continuous air movement is essential should be connected to individual
electrical circuits, with a minimum of two circuits per room. For electrical connection requirements, refer to diagram
on motor nameplate and to information enclosed with the Munters environmental control to be used. After wiring
check for proper motor rotation.
Single Phase Fans: motor overload protection should be provided for each fan. A Circuit Breaker Switch or slow
blow motor type fuses must be used, See Figure 13A. See form QM1400 for proper size.
Three Phase Fans: motor overload protection should be provided for each fan. A three-pole motor starter or slow
blow motor fuses must be used. See Figure 13B.
If a frequency drive (inverter) is used, confirm that motors are rated for inverter duty at the voltage used. Shielded
power cable between frequency drive and each motor is highly recommended. Installation of line reactors is
recommended to reduce voltage spikes and harmonic distortion. Supplemental motor overload protection is also
recommended.
NOTE: A safety cut-off switch should be located adjacent to each fan.
Figure 13A
Single Phase - Motor Overload Protection with Disconnect
(SY2000 or Equivalent)
120 or 240 VAC
Power Supply for
Fan
L1 (H)
L2 (N)
G
T1 (H)
T2 (N)
G
120 or 240 VAC
Power Out
to Fan
L1 (H)
L2 (N)
T1 (H)
T2 (N)
KEY:
L1=Line 1
L2=Line 2
L3=Line 3
H=Hot
N=Neutral
G=Ground
NOTE: Information in parenthesis refers to 120 VAC control.
Three Phase
Power Supply for
Fan
L1
L2
G
T1
T2
G
Three Phase
Power Out
to Fan Motor
L1
L2
T1
T2
L3 T3
L3 T3
Figure 13B
Three Phase - Motor Overload Protection with Disconnect
Safety cut-off
switch
Motor Starter
Circuit Breaker Switch

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Electrical WiringChapter 3
As the power cable exits the back of motor form a drip loop and then run power cable down along strut
and "Zip" tie the cable to strut to prevent cable from getting tangled in the pulley or belt.
See Figure 14.
Then run the cable out the drain hole to the circuit breaker or control panel. (Continued on next page).
Figure 14
3.1 Recommended Wire Routing:

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Operation 4.
INITIAL START-UP: With electrical power off, verify that the fan propeller turns freely
and that all fasteners are secure. Turn on electrical power and confirm that the fan
operates smoothly.
ADJUSTMENTS: Set the fan control to the temperature shown on your ventilations system
drawing, or to a value which will provide the desired environmental conditions.
Three Phase Fans:
1) The use of a quality frequency drive and the installation of line reactors is
recommended to reduce voltage spikes and harmonic distortion.
2) Minimum operating frequency of 30 Hz.
3) Will require three pole contractors with overload protection (by others).
4.1 Operation
WARNING
!
Disconnect Power
Before Servicing
WARNING
!
Moving Parts, Disconnect
Power Before Servicing.
WARNING
!
Moving Parts: Disconnect
Power Before Servicing.
WARNING
!
Do Not Power Wash
Electrical Devices.

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Maintenance 5.
5.1 Maintenance
The following inspection and cleaning procedures should be performed monthly:
Tools Needed for Maintenance:
wrenches: 10mm, 13mm, 17mm, 27mm
1) INSPECT PROPELLER: Check that propeller is secure on prop shaft or motor shaft
and that there are no signs of damage. The blades are of a self-cleaning design
and should not require maintenance.
2) CLEAN regularly for best results:
• FAN MOTOR: Remove any dust accumulation from motor using a brush or
cloth. (DO NOT use a pressure washer). A clean motor will run cooler and last
longer. At the same time, verify that the motor is secure in its mount.
• SHUTTER: Carefully clean dust from shutter blades and frame so that blades
open and close freely. A brush or cloth should be used.
• GUARD: Clean any dust or feathers from fan guards using a brush. Dirty
guards can reduce airflow.
3) CHECK FASTENERS: For safety, all fasteners should be inspected 1 month after
initial operation and yearly thereafter. Tighten any loose connections.
4) INSPECT FAN CONTROL: With power disconnected, inspect all electrical
connections. Wiring should be secure and in good condition. Remove any dust
build-up from control case and sensor using a soft brush or cloth. NEVER CLEAN
ELECTRICAL EQUIPMENT WITH A PRESSURE WASHER!
5) GREASE BEARINGS: Grease bearings every 4-6 months.
Use no more than 2 shots when greasing fan.
• A premium non-water based grease is recommended:
- Shell Alvania #2 - Mobil Mobilux #2
- Exxon Unirex N2 - Texaco Premium RB
- Mobil 532 - Texaco Multifak #2
WARNING
!
Disconnect Power
Before Servicing
WARNING
!
Moving Parts, Disconnect
Power Before Servicing.
WARNING
!
Moving Parts: Disconnect
Power Before Servicing.
WARNING
!
Do Not Power Wash
Electrical Devices.