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BCS 7700

Modutrol Motor M7484A

The M7484A is a low voltage, reversing pro-

portional modutrol motor used to drive a fuel
valve and combustion air damper as commanded
by the BCS 7700.

T.M.  •  Rev. 7-92  •  © Honeywell Inc. 1992  •   Form Number 63-2273—1

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

Summary of Contents for BCS 7700 Series

Page 1: ...ectronic 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 Installa...

Page 2: ...g 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 2V9International 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 ...

Page 3: ...484A dimensions in in mm WIRING BOX BASE MOTOR AUXILARY END POWER END ADAPTER BRACKET 1 25 32 2 50 64 1 75 44 15 4 76 19 2 59 66 5 39 137 6 45 164 1 5 38 2 4 61 60 15 4 88 124 5 5 140 80 20 4 06 103 50 13 96 24 27 7 1 47 37 7 3 185 M2616 75 19 ...

Page 4: ...istancewhenthemotormovesthrough its full stroke 2 Stop the motor at the end of its stroke by using internal travel limit switch do not stall the motor by using the damper or valve CAUTION The motor will be damaged if it is not permitted to complete its full stroke 3 For any installation do not exceed the motor rat ings WIRING Disconnect power supply before wiring to prevent electrical shock or equ...

Page 5: ...OT VALVE IGNITION TRANSFORMER OIL MAIN VALVE GAS PRESSURE SENSOR TEST VALVE GAS MAIN VALVE KEYBOARD AND DISPLAY LIQUID CRYSTAL DISPLAY MICROCOMPUTER A B C A B C KEYBOARD 120VAC 24VAC 40VA INDICATES FEEDBACK SENSING TO OPTOISOLATORS WIRING SHOWN FOR INFRED FLAME DETECTOR FOR C7027 ULTRA VIOLET FLAME DETECTOR WIRE AS NOTED BELOW ULTRA VIOLETDECTECTOR BLUE LEAD TERMINAL 31 ULTRA VIOLET DETECTOR WHOTE...

Page 6: ...e is Operation and Checkout adequate clearance for the linkage to move through its stroke without binding or striking other objects TheM7484Aisshippedinthefullyclosedposition the limit of counterclockwise rotation as viewed from the power end of the motor To check operation of the M7484A 1 Place the BCS 7700 in Standby open the Burner Switch 2 Place the RUN TEST Switch in the TEST position 3 Place...

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