Analog Inputs (Ai) - York MILLENNIUM Y22 Installation Manual

102777-YIM-E-0206
peratures (SAT, RAT), and Building Pressure Sensor (BPS).
The binary inputs (BI) on the Millennium Simplicity use a dry
contact input to determine the status of a monitored point.
Typical BI points are Fan Status (APS), Filter Status (DFS),
and Compressor Status (HPS1-4, LPS1-4, C1O-4O).

ANALOG INPUTS (AI):

Analog inputs require parameters that define the input's char-
acteristics. Attributes of an AI include the linear range, alarm
limits, alarm differential, change of state (COS) enable, and
filter weight. The input values may be overridden by a exter-
nal system command or by using the input buttons on the
Simplicity board. This is useful to override current conditions
to test certain control functions or modes.
BAS - Economizer override; if this option is enabled, an
external BAS system will control the economizer 2-10 VDC
signal through this pair of terminals.
ST - Space Temperature sensor is a field installed sensor
(PN: 025-38928-000 - w/ Override Button). The sequence of
control for space temperature is different depending on
whether the system is a VAV or CAV. See chapter on
Sequence of Operation for a detailed description of the ST
control modes.
SSA - Space Temperature Adjust is field installed. It is a slide
adjustment located on a space sensor (PN: 025-38927-000)
with a slide bar potentiometer. It is used to offset the space
temperature setpoint. This slide-bar is a 10K ohm potentiom-
eter. The programmable range for the Setpoint adjust is +/-
5°F. For example, if the Space Temperature setpoint is set to
74°F, the SSA is programmed to +/- 3°F and the SSA is
adjusted fully to the + position, the new controlling space set-
point will be 78°F.
OAT - The outside air temperature sensor (PN: 031-01916-
000A) is a factory-installed 10 K NTC sensor. Its linear rang-
ing is from -50°F to 250°F.
OAH - Outside Air Humidity (PN: 031-09127-000-A) is a fac-
tory-installed sensor manufactured by MAMAO. The OAH
sensor, installed only with enthalpy economizer, provides a 0-
10 VDC signal to the controller over a range of 0 to 100% rel-
ative humidity. This input is used for the economizer calcula-
tion to determine whether free cooling is available and to
switch between minimum outside air and using outside air as
the first stage of cooling.
SAT - Supply Air Temperature sensor (PN: 031-01915-000A)
is a factory-installed -50°F to 250°F, 10 K NTC sensor.
RAT - Return Air Temperature sensor (PN: 031-01917-000A)
is a factory-installed -50°F to 250°F, 10 K NTC sensor.
RAH - Return Air Humidity (PN: 031-09127-000-A) is a fac-
tory-installed sensor manufactured by MAMAO, installed only
with dual enthalpy economizer. The control will calculate the
Unitary Products Group
return air enthalpy using the relative humidity and return tem-
perature inputs.
LOW VOLTAGE DETECTION - This input monitors the 24
VAC for low voltage conditions. The input has two thresholds,
one at 16 VAC and one at 19.2 VAC. If the control needs to
turn on a contactor, it will look to see if the voltage is
above19.2 VAC before it will turn it on. If the voltage is not
above 19.2 VAC, it will hold off the contactor and flash the
appropriate flash code. This flash code is not an alarm. If the
control already has contactors pulled in, it will monitor the
voltage and drop the contactors and shut down if the voltage
drops below 16 VAC and flash the appropriate flash code.
REMOTE - the control will use 0-10 VDC from third-party
BAS to control SAT setpoints. Thermostat inputs override if in
conflict with Remote Control voltage input.
SPC TEMP - offset value from the space sensor offset poten-
tiometer.
CV/VAV - resistive value across terminals, to determine
which supply fan rules the control will follow.
Demand Ventilation / IAQ - Indoor Air Quality. The IAQ
expects a 0-10 VDC signal to the control from a field supplied
and installed Carbon Dioxide (CO
is monitored for adequate ventilation. In Demand Ventilation
Mode, as the CO levels in the building rise above the pro-
2
grammed setpoint, more fresh air must be brought in. The
economizer is therefore adjusted to a more open position as
necessary. The linear ranging for IAQ sensor input is from 0
to 10,000 ppm. The Demand Ventilation setpoint is adjustable
from 0 to 2000 ppm and is set at the factory at 1000 ppm.
DPS - Duct Pressure Sensor is monitored by a factory-
installed 0-5 VDC transducer (PN: 031-01209-000A). The
high-pressure port sensing tube is installed in the field. The
sense tube should be located approximately two thirds of the
way down the duct plenum. To prevent an unstable signal
due to air turbulence, there should be no obstructions, turns
or VAV terminal boxes up or down-stream of the sense tube
location for at least 6 to 10 times the diameter of the duct.
The sensor is located in the control box just below the Millen-
nium Simplicity control.
BPS - The Building Pressure Sensor (PN: 031-01262-000A)
is a factory-installed Johnson Controls DPT-2640-522 trans-
ducer that provides a 0 to 5 VDC signal to the controller over
a range from -0.25"WC to +0.25"WC. The transducer is
located in the control box just below the Millennium Simplicity
control. The sense tubes are field installed with the outside
pressure being sensed external to the unit. To avoid an
erratic pressure reading, the building pressure sense tube
should be mounted in an area away from the return air grill,
discharge diffusers, doors and windows.
) sensor. Indoor air quality
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