Honeywell Modutrol IV M72 Series Manual page 5

MOUNTING
Always mount the motor with the shaft in a horizontal
position. Mounting flanges extending from the bottom of
the motor housing are drilled for 1/4 in. [6 mm] machine
screws or bolts.
The Modutrol IV Motors are shipped in the closed
position. The closed position is the limit of counterclock-
wise rotation as viewed from the power end of the
motor. See Fig. 2. Motors with a "G" suffix letter, or
normally open, spring return, are shipped in the open
position (at the limit of clockwise rotation as viewed from
the power end).
Fig. 2—Motor shaft position at limit of rotation
as viewed from power end of motor.
M7272, M7282, M7285, M7286
VERTICAL
REFERENCE
FULLY CLOSED
10°
90°
FULLY OPEN
90 DEGREE
STROKE
SPRING RETURN MOTORS
M7261, M7274, M7281, M7284, M7294
VERTICAL
REFERENCE
45 °
FULLY
CLOSED
90 °
FULLY
OPEN
90 DEGREE
STROKE
NON-SPRING RETURN
MOTORS
M7261,M7272,M7274,M7281,M7282,M7284,M7285,M7286,M7294
VERTICAL
REFERENCE
FULLY CLOSED
10°
160°
FULLY OPEN
160 DEGREE STROKE
VERTICAL
REFERENCE
FULLY CLOSED
10 °
160 °
FULLY OPEN
160 DEGREE STROKE
M5509
ADAPTER BRACKET
The 220738A Adapter Bracket, positioned between the
motor and the equipment, raises the motor shaft height by
0.75 in. [19 mm] to match that of the former Modutrol
Motor. This is required on all valve linkage applications,
Q607 External Auxiliary Switch applications, and on some
damper linkage applications (either to provide clearance
for the crankarm to rotate through the downward position,
or to allow the damper linkage to reach the motor shaft).
To mount the motor with the bracket:
1. Mount the bracket to the equipment with existing or
standard bolts.
2. Mount the motor to the bracket using the bolts pro-
vided. See Fig. 3.
For valve linkage applications, first mount the bracket to
the linkage. The bracket then provides a convenient base on
which the motor can be positioned. After the motor shaft is
aligned with the linkage, attach the motor to the bracket
with the four bolts provided. For the M7281 and M7284,
put the bolts through the outer set of back slots of the motor
flange and into the threaded holes of the bracket. See Fig. 4.
For the M7282 and M7285, put the bolts through the outer
set of back slots of the motor flange and into the outer
threaded holes of the bracket.
LINKAGES
Use of the 220738A Adapter Bracket (packed with the
motor) is optional for many damper applications. Use the
bracket in damper applications requiring the crank arm to
rotate through the bottom plane of the motor. If you do not
use the bracket, you will have to adjust the damper linkage
to the new shaft location.
The 220738A Adapter Bracket must be used with the
Q100, Q601 and Q618 Valve Linkages in all valve applica-
tions. See Fig. 4.
The motor comes without a crank arm. The motor crank
arm is included in the Q605 Linkage or may be ordered
separately. (See Accessories.)
For detailed instructions on the assembly of specific
linkages, refer to the instruction sheet packed with the
linkage. In general, check the following points of operation
when installing a motor and linkage:
1. Linkages for valves and louver-type dampers should
be adjusted so that the damper or valve moves through only
the maximum required distance while the motor moves
through its full stroke.
2. With modulating control, maximum damper opening
should be no more than 60 degrees. Little additional airflow
is provided beyond this point.
3. The motor must be stopped at the end of its stroke by
its internal limit switch and must not be stalled by the
damper or valve. The motor will be damaged if it is not
permitted to complete its full stroke.
4. Do not exceed the load and torque ratings in any
application.
5. Do not turn the motor shaft manually or with a
wrench because this will damage the motor.
5
INSTALLATION
63-2202—3