York MILLENNIUM Y22, Installation Manual

Page: 102 / 140

102777-YIM-E-0206
102 Unitary Products Group
BINARY INPUTS (BI):
APS - Supply Fan status is monitored by an Air Proving Sta-
tus switch (PN: 024-27557-000A) installed at the factory. The
APS monitors the difference in pressure between the suction
and discharge of the fan.
C1O through C4O - These four binary inputs report the status
of the Compressors 1 through 4 overload modules.
FOVR - Monitoring loop through the supply fan overload
module.
HPS1-4 , LPS1-4 - The refrigerant high pressure (HP) and low
pressure (LP) safety switches, are independently monitored
by the Millennium Simplicity. If any switch opens, the control
voltage from the control binary output is interrupted and the
status is monitored by the control.
G, OCC, P - These signals represent Fan (G), Building Occu-
pancy (OCC), and Building Purge (P) calls from the thermo-
stat. If a thermostat is installed on the system, these inputs
are connected to the thermostat interface board just as are
the cooling/heating calls. These inputs are connected through
the Tstat Interface board directly to the respective binary
inputs of the Controller. These signals are, however, each
loaded with a resistor to maintain voltage levels and to pre-
vent “floating” of signals. Thermostat wiring is typically not
shielded and may have induced voltages that could cause
errant signal readings by the controller.
FILT - Dirty Filter switch [customer supplied, field installed on
factory-provided harness connections] input to provide a filter
status to the control. The control will alarm only after 24V has
been sensed for ten minutes.
GV1-3 - Monitoring that voltage is being supplied to gas
valves on optional heat stages.
LIM1-3 - Overtemperature inputs from optional heat stages.
FSI - Freeze Stat is a customer installed temperature switch
on the FSI input to the controller to tell the control that a tem-
perature has occurred that risks the hot water or steam coil.
Y1-4, W1-3 - If a thermostat is installed on the system, these
inputs will take priority over software programmed setpoints
and limits.
SD - This terminal set allows attachment of an external shut-
down NC contact. 24VAC power is supplied to the board at
SD2; a factory installed jumper passes that power to terminal
R to power the Simplicity Elite board. If an external shutdown
signal is required at a particular installation, remove the
jumper and connect the NC shutdown circuit between SD1
and R.
OUTPUTS
Analog Outputs (AO) - Analog outputs provide a 2-10 VDC
signal to operate controlled devices. The Simplicity is cur-
rently configured to use only 2-10 VDC outputs to the Vari-
able Frequency Drive, Inlet Guide Vane, Economizer
Damper, Power Exhaust Dampers or VFD, and Heating water
valves. Since these outputs are analog, they are continuous
between 2 and 10 Volts and are proportional to the 0 to 100%
drive position of the device.
ECO - Economizer Actuator - The modulating Economizer
uses a Belimo AF24-SR.9 spring-return actuator (PN: 025-
30869-000A). This actuator uses a 2-10 VDC signal to drive
the dampers open. The actuator drives 95 degree rotation.
Note the chart below for a correlation between the input drive
signal at terminal 3 (Y1) of the Belimo actuator and the corre-
sponding output drive position of the damper:
VFD - Inlet Guide Vane or VFD . The Inlet Guide Vane uses
a Belimo GM24-SR spring-return actuator. This actuator uses
the 2-10 VDC signal from VFD+/- terminals to drive the
dampers open. The actuator drives 95 degree rotation. Note
the chart below for a correlation between the input drive sig-
nal at terminal 3 (Y1) and the corresponding output drive
position of the guide vane. If the unit has a factory-installed
Variable Frequency Drive, the 2 to 10 VDC signal is wired
from VFD+/- output directly to the VFD’s signal input termi-
nals to control fan motor speed.
TABLE 49:INPUT SIGNAL TO Y1 ACTUATOR
POSITION
Input Signal to Y1 Actuator Position
10 VDC 90 degrees
9 78
8 67
7 56
6 45
5 33
4 22
3 11
2 0
0 -5
8VDC over a 90 degree Span = 11.25 degrees/VDC
FIGURE 34 - VFD CONTROL WIRING
VFD
FR
FR
Fan
VFD +
VFD -
Simplicity
12
18
53
55
P13-1
P14-1
P14-2
Wht
Blk
TB2