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MEP-4802
Application Manual
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KMC Controls MEP-4 Series, MEP-4002, MEP-4801, MEP-4802, MEP-4001 Application Manual

...
Direct-Coupled Actuators (40 to 90 in-lb.)
Applications Guide
MEP-4xxx
Contents
Introduction .................................................................................................................................... 3
Important Notices........................................................................................................................... 3
Actuator Torque Selection ............................................................................................................... 4
Heat/Cool/VAV Applications (with the CTE-5202 Thermostat) ....................................................... 4
Accessories ..................................................................................................................................... 5
Troubleshooting .............................................................................................................................. 9
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.) 1 Applications Guide, AN0513A Rev. J
Configuration ................................................................................................................................10
Index ............................................................................................................................................. 13
Specifications, design, and operation are subject to change without notice.
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.) 2 Applications Guide, AN0513A Rev. J

Introduction

Important Notices

This application guide gives torque selection, acces­sory, troubleshooting, and other related information.
For general mounting, connection, and congura- tion details, see the relevant model’s installation guide. For specications and other information, see the relevant model’s data sheet and the selection guide. The latest support les are always available on the KMC Controls web site (www.kmccontrols.
com):
• KMC Actuators Selection Guide
• MEP-4000/4800 Series (40/80 in-lb., proportional
or tri-state) Data Sheet and Installation Guide
• MEP-4200/4500/4900 Series (fail-safe, 25/45/90 in-
lb., proportional or tri-state/two position) Data
Sheet and Installation Guide
• MEP-4201/4501/4901 (fast operating, 25/45/90
in-lb., tri-state/two position) Data Sheet and
Installation Guide
NOTE: For sample proportional single-zone
heating/cooling valve applications using the CTE-5202 electronic thermostat, see the
CTE-5202 Applications Guide.
NOTE: The models MEP-4101 (tri-state, 10 in-
lb., with transluscent cover) and MEP-
4042/4842 (40/80 in-lb., proportional, with
modular connectors) are quite dierent
from the rest of the MEP-4xxx series. Also, any particular MEP-4xxx model may
not have one or more features (e.g., fail­safe, auxiliary switch) described in this
document. Use only the information from this document that is relevant to the MEP-
4xxx model in use.
The KMC logo is a registered trademark of KMC Controls, Inc. All rights reserved. No part of this publication may be reproduced, transmied, tran­scribed, stored in a retrieval system, or translated
into any language in any form by any means with­out the wrien permission of KMC Controls, Inc.
The material in this document is for information purposes only. The contents and the product it de- scribes are subject to change without notice. KMC
Controls, Inc. makes no representations or warran­ties with respect to this document. In no event shall
KMC Controls, Inc. be liable for any damages, direct or incidental, arising out of or related to the use of this document.
WARNING
Risk of electrical shock in line-voltage models. Disconnect ALL power before servicing. More than one disconnect provided on models with auxiliary switches. Failure to follow electrical safety precautions with live electrical components could result in injury or death.
WARNING
If both conduit connections are used in line­voltage models, they MUST be externally connected during installation. The nonmetallic enclosure does not provide grounding connection between the two conduit connections.
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.) 3 Applications Guide, AN0513A Rev. J

Actuator Torque Selection

Damper manufacturers should provide information about the required minimum actuator torque. If
by multiplying the height and width in inches and
then dividing by 144.)
that information is not available, use the following
general guidelines to calculate the required torque.
(Square feet for a rectangular duct can be calculated
Damper Type
Opposed Blades Without Seals
Parallel Blades Without Seals
Opposed Blades With Seals
Parallel Blades With Seals
Up to 1000 FPM
3 in-lb. per square foot
4 in-lb. per square foot
5 in-lb. per square foot
7 in-lb. per square foot
After minimum torque is known, see the actuator
data sheets to select the appropriate model.
1000 to 2500 FPM
4.5 in-lb. per square foot
6 in-lb. per square foot
7.5 in-lb. per square foot
10.5 in-lb. per square foot
2500 to 3000 FPM
6 in-lb. per square foot
8 in-lb. per square foot
10 in-lb. per square foot
14 in-lb. per square foot

Heat/Cool/VAV Applications (with the CTE-5202 Thermostat)

MEP-4xxx actuators can be used in single zone pro­portional heating (baseboard heaters) and cooling
(chilled beams) with valves or SCR control as well as
pressure-dependent VAV applications. For details of a variety of sample applications, see the CTE-5202
Applications Guide.
(For an example of a fail-safe application on an
outside air damper, see Fail-Safe Direction (MEP-
42/45/49xx) on page 13.)
Chilled
Beam
4-Pipe
Heating
and
Cooling
Cooling Valv e
24 VAC
Common
Input
CTE-5202
Thermostat
T
AO1
AO2
AI1
T
~
24 VA C
(Neutral)
(Phase)
– ~
Pressure Dependent VAV with
Auto and Override to Fully Closed
Heating Valv e
24 VAC
Common
Input
MEP-4002
Actuator
24 VAC
Common
Out
Input
24 VA C @ 5 VA
(Neutral)
(Phase)
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.) 4 Applications Guide, AN0513A Rev. J
– ~
NC SPST
Relay
(Override
to Fully
Closed)
CTE-5202
Thermostat
T
AO1
AO2
AI1
T
~
(5K–10K
Ohm Resistor
between AI1
and Common
for Heating
Mode Only)

Accessories

Ball Joint and Crank Arms

VTD-0804 Ball Joints
Crank
Arm
1/4-28X3/4"
Cap Screw
1/4-28
Hex Nut
5/16" Dia. Rod (not included)
The HLO-4001 crank arm
kit is used when direct
mounting of the actuator is impractical. See also the
VTD-0804 replacement
ball joint and VTD-
14xx crank arms.
(Not included)
(3) Mounting Holes for #8 screws
(not included)
Sloed crank arms are for aaching to dampers
or other shafts, and they can be used in conjunc-
tion with the HLO-4001 crank arm kit. In the VTD­1403/1404 short crank arms, an aached ball joint (see the VTD-0804) can be adjusted from 3/4 inches (minimum) to 2-7/8 inches (maximum) from the cen-
ter of the shaft. In VTD-1405/1406 long crank arms, the maximum is 4-5/8 inches.
VTD-1403 Short sloed, for 3/8" shafts
VTD-1404 Short sloed, for 1/2" shafts
VTD-1405 Long sloed, for 1/2" shafts
VTD-1406 Long sloed, for 3/8" shafts
KIT INCLUDES: (1) Crank Arm (2) 1/4-28 X 3/4" Cap Screws (2) 1/4-28 Hex Nuts (2) VTD-0804 Ball Joints
Three-hole crank arms are for aaching to dampers
or other shafts, and they can be used in conjunction
with the HLO-4001 crank arm kit. An aached ball joint (see the VTD-0804) can be 1-9/16 inches (inner hole), 2-3/16 inches (middle hole), or 2-7/8 inches (outer hole) from the center of the shaft.
VTD-1414 Three-hole, for 3/8" shafts
VTD-1415 Three-hole, for 1/2" shafts
The VTD-0804 replace­ment ball joint is for side­mounted 5/16" diameter
rods (1/4-20 male mount­ing stud with locknut). See
also the HLO-4001 crank arm kit.
MEP-4xxx Direct-Coupled Actuators (40 to 90 in-lb.) 5 Applications Guide, AN0513A Rev. J
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