Munters ATLAS 74 User manual

1© Munters Corporation, November 2023 QM1495r1
Instruction Manual
ATLAS 74 Fan with Munters Drive
Models: ATS74D3F43CT-HO • ATS74D3F43CT-HE
Munters
ATLAS 74
74” Exhaust Fan
with
Munters Drive*
              

© Munters Corporation, November 2023
2QM1495r1
Munters ATLAS 74 Fan with Munters Drive
Instructions for Use and Maintenance
Thank You:
Thank you for purchasing an ATLAS 74 Fan with Munters Drive. 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 ensure 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.

3 Munters Corporation, November 2023 QM1495r1
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 8-17
2.1 Installation 8
2.2 Cone Installation 12
2.3 PT Shutter 15
2.4 Shutter Wind Kit 16
3. Electrical Wiring 18-23
3.1 Recommended Wire Routing 19
3.2 Three Phase Power Connection 20
3.3 Fan Operation with No Control 21
3.4 Fan Operation On/Off with Control 21
3.5 Fan Operation Off /Low/High 22
3.6 Fan Operation Off /Variable with 10-0V Signal 22
3.7 Fan Operation Off /Variable with Potentiometer 23
3.8 Fan Alarm Connections 23
4. Operation and Maintenance 24
5. Troubleshooting 25
6. Winterizing 26
6.1 Winterizing 26
6.2 Winter Weather Protection 26
7. Exploded View and Parts List 28-29

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Unpacking the Equipment 1.
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.
1.1 Parts List
[A]
[B]
[C]
[D]
[E]
[F]
[G]
Each Fan includes:
1 – Munters Drive Fan
4 – Cone Sections, PL
2 – Guard Sections, CTD
1 – Shutter
2 – Shutter Wind Bracket, GZ
1 – Shutter Wind Pipe, GZ
4 – Reinforcing Ring, ¼ Section, Atlas74, CTD-STL, White
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
[D] 4 KS1169 5⁄16”-18 x 1.75” SRTD Flange Head Bolt, ZP
[E] 4 KN1706 5⁄16”-18 Nylock Nut, ZP
Each FH1890 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
[F] 8 KS1180 3⁄8”-16 x 1.5” Flange Head Bolt, ZP
[G] 8 KN0705 3⁄8”-16 SRTD Flange Nut, ZP
WARNING:
A Munters Lift Kit, FH1890, is required for installation of Atlas Fan.
One Lift Kit may be used for multiple Atlas Fans. Failure to use the
Munters Lift Kit may result in damage to fan. DO NOT use chains
to lift fan for installation. Damage from chains will not be covered
under warranty.

5 Munters Corporation, November 2023 QM1495r1
1.2 Fan Dimensions
Unpacking the EquipmentChapter 1
Fan Specifi cations:
Hertz: 60
Voltage: 460VAC
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” 211⁄2” 441⁄2” 89” 89” 137⁄8” 353⁄4” 603/16”2⁵⁄₁₆” 853⁄8” 84½ ”W. 84½ ”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
1.3A Recommended Fan Spacing
Elevation View
(Recommended Fan Spacing)
Top View
(Recommended Fan Spacing)
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.

7 Munters Corporation, November 2023 QM1495r1
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 Bracket 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.
1.3B Minimum Fan Spacing (Optional)

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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.

9 Munters Corporation, November 2023 QM1495r1
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
A Lift Bracket Kit is available to be able to lift fan into the framed opening. Attach each Lift Bracket to
Bearing Bracket and Strut using (4) Bolts [F] and Nuts [G]. See Figure 2. Once fan has been installed
in wall Lift Bracket can be removed and installed in next fan for installation.
Bolt [F]
Left Lift Bracket
Munters Drive Bracket
Right Lift
Bracket
Nut [G]
Figure 2
WARNING:
A Munters Lift Kit, FH1890, is required for installation of Atlas Fan. One Lift Kit may be used for
multiple Atlas Fans. Failure to use the Munters Lift Kit may result in damage to fan. DO NOT
use chains to lift fan for installation. Damage from chains will not be covered under warranty.

© Munters Corporation, November 2023
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Installation InstructionsChapter 2
Step 3A
Using Munters Lift Kit, FH1890, insert fan into the framed opening from the inside. While holding fan tight to
framing, fasten top of fan with (5) ¼" x 1.5"L. minimum Mounting Screw/Bolt (not provided). See Figure 3A .
Next, fasten bottom of fan, then both sides with (5) ¼" x 1.5"L. minimum 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
¼" x 1.5"L. minimum
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.
Note:
Once Fan is installed in wall,
remove Lifting Brackets from
Fan and install in next Fan
for installation.

11© Munters Corporation, November 2023 QM1495r1
Installation InstructionsChapter 2
Figure 5
Step 5
Wrap the Reinforcing Rings around the outlet orifice of the fan and align the slots in the tabs with the holes in the
orifice and secure the final End Flanges together using (1) Bolt [D] and Nylock Nut [E]. See Figure 5. Do not fully
tighten the last bolt and nut at this time.
Step 4
Lay (4) Reinforcing Rings in a circular pattern on a flat surface with the tabs facing up. Fasten the Rings
together at the End Flanges using (3) Bolts [D] and Nylock Nuts [E], leaving one pair of the End Flanges
unattached. See Figure 4 .
Figure 4
Nylock Nut [E]
End Flange
Bolt [D]
Reinforcing Ring
Nylock Nut [E]
End Flange
Bolt [D]

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Figure 6A
Figure 7
Bolt [A] Outer Hole
Step 6
Place all 4 cone sections on a flat surface with tabs from one facing slots of the next. See Figure 6A. 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 6B. Repeat this step until all 4 cone sections are
connected and laying flat.
2.2 Cone Installation
Figure 6B
Step 7
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 7.
Nut [B]
Bolt [A]
Inner Hole
Nut [B]
Installation InstructionsChapter 2

13 Munters Corporation, November 2023 QM1495r1
Installation InstructionsChapter 2
Figure 8
Figure 9
Step 8
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 8. Leave all bolts and nuts loose at this time.
Bolt [A]
Nut [B]
Bolt [A]
Nut [B]
Bolt [A]
Nut [B]
Washer [C]
Step 9
Make sure the slots in the tabs of the Reinforcing Ring still line up with holes in the orifice of the fan. Install cone
onto fan over the tabs of the Reinforcing Ring by putting cone over fan orifice and line up outer holes of cone
with holes in fan orifice and tab slots. 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 with the tabs between orifice and cone.
See Figure 9. Torque the last Ring Bolt to 125 in-lbs [14 Nm], and then tighten all the cone bolts at this time.
Slot in Tab lined up with Hole in Fan Orifi ce

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Installation InstructionsChapter 2
Step 11
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 11.
Figure 11
Step 10
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 10.
Figure 10
Wire Loop
Bolt [A]
Nut [B]
Previously installed -
Bolt and Nut
Nut [B]

15© Munters Corporation, November 2023 QM1495r1
Installation InstructionsChapter 2
Figure 12
PT Shutter
Step 13
Fasten shutter in place by rotating the side and top shutter clips over the shutter flanges. See Figure 13.
Figure 13
2.3 PT Shutter Installation
Fixed Bottom Shutter Clip
Note:
PT Shutter extends into room
2 5⁄16” from back of fan.
Step 12
Insert PT Shutter into fan by sliding the bottom flange of shutter into
bottom shutter clips and pressing shutter inward. See Figure 12.
Position to install/remove Shutter
Position to hold Shutter in place
¼"

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Installation InstructionsChapter 2
Step 14
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 14A.
Fasten Brackets in place using (2) Lag Screws (not provided). See Figure 14B.
3'-3"
3'-3"
Figure 14A
Figure 14B
Lag Screw
(not provided)
Wind Kit Bracket
2.4 Shutter Wind Kit Installation

17 Munters Corporation, November 2023 QM1495r1
Installation InstructionsChapter 2
Step 15
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 15A. For the completed Wind Kit
installation See Figure 15B.
Figure 15A
Figure 15B

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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.
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 16.
NOTE: A safety cut-off switch should be located adjacent to each fan.
KEY:
L1=Line 1
L2=Line 2
L3=Line 3
G=Ground
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 
 

 
 

         
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    !   
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Figure 16
Three Phase - Motor Overload Protection with Disconnect
     #  $  %
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!        
WARNING
!
High Voltage, disconnect power
before servicing.

19 Munters Corporation, November 2023 QM1495r1
As the power cable exits the Munters Drive Box 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 propeller. See Figure 17.
Then run the cable out of fan to circuit breaker or control panel. (Continued on next page).
Figure 17
3.1 Recommended Wire Routing:
WARNING: Fan is designed to be operated with shutter in place. Do not apply power to fan without
shutter being installed.
Electrical WiringChapter 3

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Electrical WiringChapter 3
All cables that enter the Munter Drive box must enter through a properly sized watertight fitting. Loosen
the (4) screws in the cover of the Munters Drive box to access the terminals inside to connect power and
other cables. See Figure 18A. Run the 3 phase power cable through watertight fitting into the Munters
Drive box and connect to the terminals "R/L1, S/L2, T/L3" and Ground in the box. See Figure 18B. The
Munters Drive is prewired to the Motor.
3.2 Three Phase Power connection:
Cover Screw (captured)
Munters Drive cover
Munters Drive Box
Munters Drive Motor
Figure 18A
Figure 18B
WARNING
!
High Voltage, disconnect power
before servicing.
***WARNING***
Only the Cover of the Blue Box
is designed to be removed. It
has captured screws that remain
in the cover. The Base of Blue
Box and Heat Sink must not be
removed from back of motor.
Removing Base or Heat Sink from
motor will void the warranty.
Any water or other damage to
the controller will not be covered
if the either is removed.
460V
3 Phase
Power Supply
Prewired
to Motor
***** NOTE *****
Power to the Drive must be within
-4%, +8% of nominal voltage.
Munters Recommended;
Absolute Minimum Voltage = 440V
Absolute Maximum Voltage = 500V
Munters Recommends Line to Line
Voltage Unbalance to be 1% or less
per NEMA MG-1-1998. Absolute
maximum unbalance is 1.5%.