Honeywell BCS 7700, M7484A Series Manual
Modutrol Motor M7484A
The M7484A is a low voltage, reversing proportional modutrol motor used to drive a fuel
valve and combustion air damper as commanded
by the BCS 7700.
BCS 7700
■ Electronic, vibration resistant drive circuit.
■ Requires 24 Vac power supply.
■ Die-cast aluminum case.
■ Feedback potentiometer circuit provides position
indication input to the BCS 7700.
■ Motor stroke is fixed 90˚, 30 second timing.
■ Low and High Fire position proving feedback
potentiometer circuit.
■ 150 lb.-in. torque.
■ Accessories include weather proofing kit.
CONTENTS
Specifications ................................................2
Ordering Information.................................... 2
Installation .................................................... 4
Operation and Checkout ...............................6
T.M. • Rev. 7-92 • © Honeywell Inc. 1992 • Form Number 63-2273—1
M7484A
SPECIFICATIONS • ORDERING INFORMATION
Internal
Electronic Internal
Drive Auxiliary
Model Timing Circuit Switch
M7484A1010 30 sec Yes No
CRANKSHAFT: Double ended, 3/8 inch square.
STROKE: 90˚ fixed.
TORQUE: 150 lb.-in.
Timing Normal
[Nominal] Running Breakaway
90° Stroke Torque Torque
30 sec 150 lb.-in. 300 lb.-in.
a
Maximum torque available to overcome occasional
large loads such as seized damper or valve. MUST NOT
BE USED CONTINUOUSLY AT THIS RATING.
DEADWEIGHT LOAD ON SHAFT:
Power End: 200 lb. [91 kg] maximum.
Auxiliary End: 200 lb. [45 kg] maximum.
ELECTRICAL RATINGS:
Terminal Description Rating
G Common
(Negative Supply)
Y • Power Supply from 8.0V
BCS 7700 +/- 0.050 Vdc
• Overvoltage 9.0 Vdc
continuous maximum
T Signal to BCS 7700 1.5-5.5 Vdc
1 Modutrol Motor closed 24 Vac
2 Modutrol Motor open 50/60 Hz
3 Modutrol Motor common
Current Draw: 0.8A at 24 Vac.
Power Consumption: 18W.
Specif ications
ENVIRONMENTAL RATINGS:
Ambient Temperature:
Operating: 32° F to 150° F.
Storage: -30° F to 150° F.
Humidity:
Operating: 85% RH continuous, noncondensing.
Vibration: Continuous 0.5G environment.
Dimensions: See Fig. 1.
ACCESSORIES:
DHE-94 Explosion-proof Housing— encloses motor
for use in explosive atmospheres. Not for use with
Q601 and Q455 Linkage. Requires 7617DM Coupling and 220738A Adapter Bracket.
a
Q607 Auxiliary Switch—controls auxiliary equipment
as a function of motor position. (Requires use of
220738A Adapter Bracket.)
Q605 Damper Linkage—connects motor to damper;
includes motor crank arm.
Q601 Linkage—connects motor to water or steam
valve.
Q618 Linkage—connects motor to water or steam
valve.
Q100 Linkage—connects motor to butterfly valve.
(Requires use of 220738A Adapter Bracket.)
Q181A Auxiliary Potentiometer—used to control aux-
iliary motor.
4074ERU Weatherproofing Kit—weatherproofs the
motor.
7617ADW Motor Crank Arm—included with Q605
but not with motor.
220741A Screw Terminal Adapter—used to convert
motor quick-connect terminals to screw terminals.
220738A Adapter Bracket—adjusts shaft height of
M7484A to match M741B.
Ordering Inf ormation
When purchasing replacement and modernization products from your wholesaler or your distributor, refer to the price sheets for
complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Satisfaction
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 542-7500
In Canada—Honeywell Limited/Honeywell Limitee, 740 Ellesmere Road, Scarborough, Ontario M1P 2V9 International Sales
and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan,
Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
2
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