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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)
Summary of Contents for MILLENNIUM Y22
Page 47: ...102777 YIM E 0206 Unitary Products Group 47 FIGURE 20 ALTITUDE TEMPERATURE CONVERSION FACTOR ...
Page 50: ...102777 YIM E 0206 50 Unitary Products Group FIGURE 21 FAN PERFORMANCE 25 TON ...
Page 53: ...102777 YIM E 0206 Unitary Products Group 53 FIGURE 22 FAN PERFORMANCE 30 TON ...
Page 56: ...102777 YIM E 0206 56 Unitary Products Group FIGURE 23 FAN PERFORMANCE 40 TON ...
Page 126: ...102777 YIM E 0206 126 Unitary Products Group FIGURE 52 TYPICAL CONTROL WIRING ...
Page 127: ...102777 YIM E 0206 Unitary Products Group 127 FIGURE 53 LEGEND ...
Page 128: ...102777 YIM E 0206 128 Unitary Products Group FIGURE 54 TYPICAL 25 TON POWER WIRING ...
Page 129: ...102777 YIM E 0206 Unitary Products Group 129 FIGURE 55 TYPICAL 30 40 TON POWER WIRING ...
Page 130: ...102777 YIM E 0206 130 Unitary Products Group FIGURE 56 TYPICAL GAS HEAT WIRING ...
Page 134: ...102777 YIM E 0206 134 Unitary Products Group FIGURE 58 25 TON CHARGING CURVE ...
Page 139: ...102777 YIM E 0206 Unitary Products Group 139 ...