4 R81EAA Technical Bulletin
Parallel Damper Actuators
In certain applications, It may be
possible that outside air, return
air, and exhaust air dampers
cannot be modulated by a single
motor actuator. In this event, up
to two additional M100J motor
actuators can be slaved from the
first Series M100 motor actuator
with the R81EAA installed. This
is illustrated in Fig. 8.
Checkout Procedure
Relay “A”
Turn the O.A. minimum position
potentiometer full
counterclockwise (CCW), and
energize the changeover relay.
This simulates the availability of
outside air for natural cooling.
Adjust the set point to
approximately midrange, 65
°
F
(18
°
C). Next jumper sensor
terminals S1 and S2. Since a
negative temperature coefficient
sensor is used, this will simulate
a rise in mixed air temperature
and the O.A. dampers will
modulate open. Remove the
jumper and disconnect terminal
S2. This will now simulate a
drop in mixed air temperature
and the O.A. dampers should
modulate closed.
Minimum Position
De-energize the changeover
relay to simulate that outside air
is no longer available for natural
cooling. The motor actuator will
rotate to the minimum position.
By turning the minimum position
potentiometer clockwise (CW),
the minimum position should
increase. The motor actuator
will rotate CW.
Checkout Procedure
After the linkage and motor
actuator have been assembled
to the valve or damper, cycle the
motor actuator using the
controller. Observe at least
three complete operating cycles
to see that all components are
functioning correctly.
Repairs and Replacement
Field repairs must not be made.
For a replacement electronic
board kit, contact the nearest
Johnson Controls Commercial
Systems wholesaler.
