Johnson Controls R81EAA Quick Start Manual

Application
R81 plug-in electronic board kits
are used in Series M100X base
motor actuators and as a
replacement or conversion board
kit in an existing Series M100
motor actuator. The R81EAA kit
consists of a vertical plug-in
board, a terminal board with
travel and set point adjustment,
top cover with a circuit board and
ribbon attachment, mounting
screws, and an identification
label.
The R81EAA economizer board
kit has a changeover relay,
refrigeration programming relay,
adjustable minimum position
potentiometer, mixed air set point
adjustment, proportional band
adjustment, and an actuator
travel adjustment.
When the R81EAA is installed in
the M100 Series, the motor
actuator controls outdoor air
dampers (O.A.), return air
dampers (R.A.), and exhaust air
(E.A.) dampers to maintain proper
mixed air. The motor actuator with
the R81EAA installed allows
economical use of outdoor air for
natural cooling and reduces
energy consumption by minimizing
the compressor run-time. The
internal changeover relay and
refrigeration programming relay
can be wired in various ways to
provide control sequences that
use available natural cooling.
These cooling options must be
wired with A19 temperature
controls (sensible changeover) or
W84 total heat controls (enthalpy
changeover). A91 thermistor
sensors are used for direct mixed
air control or T91 thermistor room
thermostats are used for
ventilation only systems.
All Series R81 electronic board
kits are designed for use only as
operating controls. An operating
control is not authorized for use
where its failure in any mode can
© Johnson Controls, Inc.
Code No. LIT-121579
Part No. 34-492-0, Rev. --
R81EAA Type
Plug-In Electronic Circuit Board Kit
For Series M100 Motor Actuators
Fig. 1 -Drawing showing how to remove and/or
result in personal injury and/or
loss of property. It is the
responsibility of the user to add
those necessary devices that
protect against undesirable
system failure modes.
Operation
Installation Sheets Manual 121
Relays and Contactors Section R
install the R81 Plug-In Electronic Board Kit
Technical Bulletin R81EAA
To accomplish greater energy
savings, the motor actuator will
be cycled by the room thermostat
on a call for cooling.
1