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OPERATION
The M7161, M7164 and M7184 Motors operate in
response to a dc voltage input signal to terminals C and R,
positioning a valve or damper at any position between fully
open and fully closed. The input signal causes the modified
dc bridge circuit in the motor to become unbalanced. The
small signal resulting from the bridge unbalance is ampli-
fied and energizes 1 of 2 triacs to run the motor. As the motor
runs, a feedback potentiometer driven by the motor moves
to rebalance the bridge. When the bridge is balanced, the
motor stops.
TABLE 1—CROSS REFERENCE OF RANCO AND HONEYWELL ELECTRONIC MOTORS.
Ranco
Actuator Family
LA2-1000
Zone Mixing
Damper Actuator
direct-action,
spring return,
nominal 35 lb
[155.6N] force,
2 in.[50.8 mm]
stroke.
LA2-2000
Modulating Heating
Valve Actuator
reverse-acting,
spring return,
nominal 35 lb
[155.6 N] force,
2 in. [50.8 mm]
stroke.
a
New damper linkage and pushrod required.
b
This motor is used with modulating gas valves (butterfly valves).
c
On the Ranco Actuator, electrical normal is the position (extended = open; retracted = closed) of the actuator drive shaft (as
viewed from the power end) when power is applied to the motor and input (command) signal is at the lowest point of the input
voltage range.
d
These motors are for use with modulating steam or hot water valves: valve and linkage replacement are required.
e
This normally open motor provides power end damper linkage connection when space constraints prevent using a normally
closed motor.
Operation and Replacement
Input
Voltage dc
Honeywell Motor Replacement
10.5 to 13.5
M7161G1009
M7164G1006
M7164G1030
M7164A1017
4.0 to 7.0
M7161G1017
M7164G1014
M7161G1025
M7164G1022
M7164A1009
REPLACEMENT OF RANCO LA2 LINEAR
ACTUATORS AND HONEYWELL SPECIAL
PACKAGED HVAC UNIT MOTORS
The M7164 Motors may be used for field replacement
of Ranco LA2-1000 Series Zone Mixing Damper Actuators
and LA2-2000 Series Modulating Heating Valve Actuators
as described below. To select the appropriate model, refer
to Table 1.
a,e
90 deg, 30 sec, 120 Vac,
a,e
19W, 35 lb-in. [4.0 N-m],
a,e
electrically normally open
a
90 deg, 30 sec, 24 Vac,
14W, 35 lb-in. [4.0 N-m],
electrically normally closed
b,e
90 deg, 30 sec, 120 Vac,
b,e
19W, 35 lb-in. [4.0 N-m],
electrically normally open
d,e
160 deg, 60 sec, 24 Vac,
d,e
14W, 35 lb-in. [4.0 N-m],
electrically normally open
d
160 deg, 60 sec, 24 Vac,
19W, 35 lb-in. [4.0 N-m],
electrically normally closed
9
M7161, M7164, M7184
OPERATION AND REPLACEMENT
Linkage
Required
Q605,
pushrod
c
.
Q605,
pushrod
c
.
Q100
c
.
Q601, Q618
or Q5001
c
.
Q601, Q618
or Q5001
c
.
63-2197—2
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