M7161, M7164, M7184
OPERATION AND REPLACEMENT
9
63-2197—2
Operation and Replacement
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.
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.
TABLE 1—CROSS REFERENCE OF RANCO AND HONEYWELL ELECTRONIC MOTORS.
Ranco
Input
Linkage
Actuator Family
Voltage dc
Honeywell Motor Replacement
Required
10.5 to 13.5
M7161G1009
a,e
90 deg, 30 sec, 120 Vac,
Q605,
M7164G1006
a,e
19W, 35 lb-in. [4.0 N-m],
pushrod
M7164G1030
a,e
electrically normally open
c
.
M7164A1017
a
90 deg, 30 sec, 24 Vac,
Q605,
14W, 35 lb-in. [4.0 N-m],
pushrod
electrically normally closed
c
.
4.0 to 7.0
M7161G1017
b,e
90 deg, 30 sec, 120 Vac,
Q100
M7164G1014
b,e
19W, 35 lb-in. [4.0 N-m],
electrically normally open
c
.
M7161G1025
d,e
160 deg, 60 sec, 24 Vac,
Q601, Q618
M7164G1022
d,e
14W, 35 lb-in. [4.0 N-m],
or Q5001
electrically normally open
c
.
M7164A1009
d
160 deg, 60 sec, 24 Vac,
Q601, Q618
19W, 35 lb-in. [4.0 N-m],
or Q5001
electrically normally closed
c
.
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.
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.