102777-YIM-E-0206
100 Unitary Products Group
WIRING AND TERMINATION, COMMUNICATIONS
Most connections to the Simplicity Control are by wiring har-
nesses. There are also screw terminal connections for ther-
mostat inputs and for communications via an RS-485 port.
COMMUNICATION ADDRESS:
The communication address button (lower right of the dis-
play) is used to identify a Millennium rooftop unit to a network,
and “capture” the next available network address for that unit.
Millenniums can be networked together for centralized moni-
toring and control. Much like we need a unique street address
in our homes so we can receive our postal mail or emergency
services, these units also need a unique address so the cen-
tral Facilities Management System (FMS) can “talk” to each
unit individually. The Simplicity board has the model and
serial number of the specific unit and has a memory space for
a customer name to be applied. So the entire identification for
a specific unit available to the network could be, for example,
Y2AC04M3KDGABA, NCNM123456, SOUTH OFFICE.
The one-time commands to Override ASCD timers and/or to
start Run Test can be issued by the Test/Reset/Up pushbut-
ton. When this button is pushed and released within five sec-
onds, the control will zero all ASCD’s for one cycle.
ACRONYMS
A number of acronyms are used throughout this training man-
ual. These are specific to the Simplicity control. They are also
used in the Technical Guide and Installation and Operation
manuals. Acronyms are used to refer to input and output
hardware points and software parameters such as timing
delays and setpoints.
The acronyms used throughout this training manual are listed
in the Acronym Table 48. They are described in much more
detail below.
INPUTS
There are two types of hardwired input points on the Simplic-
ity control: Analog and Binary. These may be sensors, feed-
back, or adjustable setpoints. Typical analog inputs [AI]
include Space Temperature (ST), Supply and Return Air Tem-
TABLE 48: ACRONYMS
INPUTS DESCRIPTION
APS Air Proving Switch
IAQ Air Quality (CO2 Sensor)
BAS Economizer
Passes BAS economizer command through
to Economizer output
BPS Building Pressure Sensor
C1O-C4O Compressor Status
DF Dirty Filter Status
DPS Duct Pressure Sensor
FSI Hot Water Coil Freeze Input
G Thermostat input for Fan
GV1-3 Monitors gas valve actuation call
HPS1-4
High pressure switch monitored for
compressor discharge
LPS1-4
Low pressure switch monitored for compres-
sor suction
Lim 1-3
Over-temperature limit switch from heat
stages
OAT Outside Air Temperature
OCC Building Occupied Status
Purge Building Purge input
RAT Return Air Temperature
SAT Supply Air Temperature
SD System Shutdown Connector
OAH Outside Air Enthalpy
RAH Return Air Enthalpy
SSA Setpoint Adjust
ST Space Temperature
W1, 2, 3 Heating Stages from Tstat
Y1,2 3, 4 Cooling Stages from Tstat
PUSHBUTTONS DESCRIPTION
Test/Reset / 'Up 'Test / control reset / Data value increment
Address / 'Down 'Change data / Data value decrement
Alarms / Advance data Show alarms / go to next data point
Program Go to program mode
Real Time Clock Incorporated on the board
OUTPUTS DESCRIPTION
Status LED
Flash to indicate alarm, otherwise
'heartbeat'
Digital displays One 2-character and one 4-character
C1-C4 Cooling Outputs 1 through 4
CF1, 2 Cond Fan Bank 1, 2
ECO Economizer damper output
EXH Exhaust Fan relay output
EXD
Exhaust Air Damper / Exhaust VFD Signal
Output
Fan
Supply Fan relay output [contactor or
permission relay]
H1, 2, 3 Heating Stages 1, 2, and 3 output
HGR Hot gas reheat [future]
HWV Hot Water Valve output
VFD Supply Fan IGV or VFD Signal Output
X Alarm signal
Miscellaneous Description
AI Analog Input
AO Analog Output
BI Binary Input same as
BO Binary Output
CAV Constant Air Volume
VAV Variable Air Volume
VFD Variable Frequency Drive
IGV Inlet Guide Vane
IAQ Indoor Air Quality
PI Proportional-Integral Control
ASCD Anti Short Cycle Timer (Compressor)
TABLE 48: ACRONYMS (Continued)
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