Munters AT14F User manual

1© Munters Corporation, July 2020 QM1050r9
Instruction Manual
Classic ‘AT’ Fans Direct Drive
Models: AT14F • AT16F • AT16G • AT18F • AT18G • AT24F •
AT24G • AT24F3 • AT24G3
14” - 24”
CLASSIC ‘AT’
Direct Drive
14” - 24” Fans
AT24F
AT24G

© Munters Corporation, July 2020
2QM1050r9
Classic ‘AT’ Fan Direct Drive 14”, 16”, 18”, 24” Fans
Instructions for Use and Maintenance
Thank You:
Thank you for purchasing a Munters Classic Fan Direct 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 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.

3 Munters Corporation, July 2020 QM1050r9
Index
Chapters Page
1. Unpacking the Equipment 4
1.1 Parts List 4
1.2 Fan Dimensions 5
2. Installation Instructions 6-8
2.1 Install 6
2.2 Shutter Installation 8
3. Electrical Wiring 9
4. Operation 11
5. Maintenance 13
6. Winterizing 14
6.1 Winterizing 14
6.2 Winter Weather Protection 14
7. Troubleshooting 15
8. Exploded View and Parts List 16-17

© Munters Corporation, July 2020
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1.1 Parts List
Unpacking the Equipment 1.
[A]
[B]
[C]
Each Fan includes:
1 – Direct Drive Fan
1 – Hardware Package as follows:
HP1076 – 14” - 24” Fiberglass Fans
ID Qty. Cat. No. Description
[A] 8 KS2105 #14 x 1.5” Lag Screw, SS
HP1008 – 16” - 24” Galvanized Fans
[B] 8 KS2463 ¹⁄₄” x 1.5” Lag Screw, ZP
[C] 8 KW3001 ¹⁄₄” Flat Washer, ZP
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.

5© Munters Corporation, July 2020 QM1050r9
1.2 Fan Dimensions
Unpacking the EquipmentChapter 1
16” - 24” Galvanized Fans14” - 24” Fiberglass Fans
DD
E - Dia.
A
A
D
B
C
Fan Specifications:
Hertz: 60 50 - 60
Voltage: 115/230VAC or 190 - 208-230/380 - 460VAC
Phase: 1 or 3
3 Phase fans only available for AT24
CAT.
NO.
FAN
DIA.
NO. OF
BLADES A B C D E - Dia.
(O.D.)
WALL OPENING
(I.D., framed)
AT14F 14” 7 195⁄8” 31⁄2” 103⁄4” 31⁄2” 141⁄2” 171⁄4”W 171⁄4”H
AT16F 16” 4 225⁄8” 41⁄4” 111⁄8” 41⁄4” 161⁄2” 201⁄$”W 201⁄4”H
AT16G 16” 4 20” 43⁄4” 101⁄4” 43⁄4” 161⁄2” 201⁄$”W 201⁄4”H
AT18F 18” 5 245⁄8” 41⁄4” 12” 41⁄4” 181⁄2” 221⁄4”W 221⁄4”W
AT18G 18” 5 22” 45⁄8”11" 45⁄8” 181⁄2” 221⁄4”W 221⁄4”W
AT24F 24” 4 303⁄4” 51⁄4” 121⁄8” 51⁄4” 241⁄2” 281⁄4”W 281⁄4”H
AT24G 24” 4 28” 57⁄8” 113⁄8” 57⁄8” 241⁄2” 281⁄4”W 281⁄4”H
A
A
B
C
D
E - Dia.

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Installation Instructions 2.
2.1 Install
Figure 1
Ceiling
Framing
12"
Wall
Opening
(See Chart on
previous page)
8”
Min.
Step 1
Construct the framed opening to correct size according to the Chart on the previous page. See Figure 1 and 2.
Wall
Opening
(See Chart on
previous page)
2x Framing
Wall Opening
15"
MIN.
Figure 2

7 Munters Corporation, July 2020 QM1050r9
Installation InstructionsChapter 2
Step 2
Insert fan into framed opening from outside and fasten in place using (8) Lag Screws [A] for Fiberglass Fans or
(8) Lag Screws [B] and Washers [C] for Galvanized Fans. Flash and caulk around opening. See Figure 3.
Note:
Outlet of fan comes unguarded, it is recommended
that a Munters Discharge Cone with Guard, a Fan
Hood with Guard or a guard by others is installed
on outlet of fan at this time.
Fiberglass
Fan
Figure 3
2x Framing 2x Framing
Washer [C]
15"
MIN.
15"
MIN.
Galvanized
Fan
Lag Screw [B]
Lag Screw [A]

© Munters Corporation, July 2020
8QM1050r9
Installation InstructionsChapter 2
2.2 Shutter Installation
Step 3
If a Shutter was purchased, install it into back of framed opening. See Figure 4. If optional Shutter Clip Kit
(FH1192) was purchased, install now using hardware provided with kit. See Figure 4.
Shutter Clip
Shutter
Figure 4
Shutter Clip
Lag Screw
Galvanized
Fan
Fiberglass
Fan
Shutter Clip
Shutter
Shutter Clip
Lag Screw

9© Munters Corporation, July 2020 QM1050r9
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 6A. 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 6B.
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 6A
Single Phase - Motor Overload Protection with Disconnect
(SY2000 or Equivalent)
          
             
  
    
    

    
    

          
       
    
    
    
    
    
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.
         
             
  
 
 

 
 

         
       
        
 
 
 
 
 !
 !
 !
 !
Figure 6B
Three Phase - Motor Overload Protection with Disconnect
      "   #   
  $  " 
          
 $  "  $  %    &     $  " 

© Munters Corporation, July 2020
10 QM1050r9
Electrical WiringChapter 3
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).
As the power cable exits the back of motor form a drip loop and then run power cable down along leg
of motor mount and "Zip" tie the cable to leg to prevent cable from getting tangled. See Figure 7. Then
run the cable out the drain hole to the circuit breaker or control panel. (Continued on next page).
Figure 7
3.1 Recommended Wire Routing: