Munters MD2 User manual

1© Munters Corporation, December 2023 QM1504r0
Instruction Manual
“MD2” Munters Drive G2
Motor and Controller Replacement Kit
Models: MD2-ATS7443-HO • MD2-ATS7443-HE •
MD2-CX7443-HO
“MD2”
Munters Drive* G2
Motor & Controller
Replacement Kit for
ATS74 and CX74 Fans
*Patents Pending
Front View
Rear View

© Munters Corporation, December 2023
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MD2 - Munters Drive Motor & Controller Replacement Kit
Instructions for Use and Maintenance
Thank You:
Thank you for purchasing a “MD” motor & controller replacement kit. 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, December 2023 QM1504r0
Index
Chapters Page
1. Unpacking the Equipment 4
1.1 Parts List 4
2. Installation Instructions 5
2.1 MD2 Replacement for Atlas 74 Fan 5
2.2 MD2 Replacement for CX74 Fan 15
3. Electrical Wiring 24
3.1 Atlas 74 GA500 Drive Wiring 24
3.2 CX74 Drive Wiring 27
4. Troubleshooting 35

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1.1 Parts List
Unpacking the Equipment 1.
[A]
[B]
Each “MD2” Munters Drive G2 Kit Includes:
1 – Munters Drive G2 Motor/Controller Assembly
1 – Hardware Package As Follows:
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.
HP1346 – Hardware Package for “MD2” Kit
ID Qty. Cat. No. Description
[A] 8 KS1927 M8-1.25 x 20mm, HX, Bolt, ZP
[B] 8 KW4906 M8 EXT Star Lock Washer, BLK OX
If you are Installing this MD2 kit on an Atlas 74 Exhaust Fan, proceed to Page 5 , Step 1.
If you are installing this MD2 Kit on a CX74 Circulation Fan, proceed to Page 15 , Step 13.
See Figures below.
Atlas 74 Exhaust Fan
Proceed to Page 5, Step 1
CX74 Circulation Fan
Proceed to Page 15, Step 13

5© Munters Corporation, December 2023 QM1504r0
2.1 MD2 Replacement for Atlas74 Fan
Installation Instructions 2.
Figure 1
Figure 2
Step 1
Disconnect power from fan before continuing. Remove the shutter from the back of the fan and set safely
aside to be reinstalled later. See Figure 1.
Step 2
For the Atlas 74 Fan it will be necessary to work from the front of the fan as well as the back of the fan, so
remove the outlet guard and bottom cone section of the cone for easy access. Set the Guard and Cone
Section and hardware aside to be reinstalled later. See Figure 2.

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Installation InstructionsChapter 2
Step 3
Loosen the (4) captured screws in the Munters Drive Box cover to access the drive wiring. Make a note of
or take a photo of the wiring. Disconnect 3 phase power and the control wires from the drive and from the
box. Then replace the cover. See Figure 3.
Figure 3
Munters Drive Box cover
Drive Control
Captured Cover Screw
Note or photo wiring

7© Munters Corporation, December 2023 QM1504r0
Installation InstructionsChapter 2
Step 4
Loosen the Set Screw holding the propeller to the shaft. Carefully remove the propeller from the fan
and set safely aside to be reinstalled later. A gear puller or prop puller may need to be used.
See Figure 4. Remove Key from Prop Adapter and keep with prop to be reused later.
Figure 4
Set Screw

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Installation InstructionsChapter 2
Step 5
Remove the (4) Bolts and Star Washers holding the Prop Adapter to the Motor. Save the Prop Adapter for
reuse later, but discard the existing bolts and washers. See Figure 5.
Figure 5
Star Washers
Bolts
Prop Adapter

9© Munters Corporation, December 2023 QM1504r0
Step 6
Remove the Motor/Drive assembly from the mounting bracket by removing the (4) bolts and star washers
holding the Motor/Drive to the brackets. Motor/Drive assembly, make sure to support it while removing
bolts so it does not fall and damage the fan housing or Motor/Drive. See Figure 6. If you were instructed
by Munters office to send the old Motor/Drive back to the office, repack it in the box that new Motor/Drive
came in to send back.
Bolts
Motor/Drive Assembly
Star Washers
Installation InstructionsChapter 2
Figure 6
Mounting Bracket

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Installation InstructionsChapter 2
Step 7
Carefully lift Motor/Drive into place and secure in place using (4) Bolts [A] and Star Washers [B]. Tighten Bolts to
60 in-lbs. [6.8 Nm] of torque. See Figure 7.
Figure 7
Motor/Drive Assembly
Bolt [A]
Star Washer [B]
Mounting Bracket