351579-YTS-B-0608
8
Johnson Controls Unitary Products
thermostat. 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
prevent “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
temperature 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
shutdown 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 currently
configured to use only 2-10 VDC outputs to the Variable
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 Johnson Controls M9220GGAYK30 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 actuator and the
corresponding output drive position of the damper:
VFD - Inlet Guide Vane or VFD
-
The Inlet Guide Vane uses a
Johnson Controls M9220GGAYK30 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
signal 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 terminals to
control fan motor speed.
Figure 4: VFD Control Wiring
EXD - Power Exhaust Damper Vane or VFD -
Power Exhaust
Damper Actuator is a Johnson Controls M9220GGAYK30. It
uses a full open/ Full Closed scheme and operates a 95 degree
rotation. If VFD Power Exhaust is configured, the same signal
controls the exhaust fan motor drive frequency.
HWV
-
Heating Water Valve -
Customer supplied and installed,
connect to factory-provided harness.
BINARY OUTPUTS (BO)
FAN
- Fan Start/Stop Relay, VFD “permission” relay FR
H1-3 - HEAT STAGES 1 TO 3 [OPTIONAL]
C1 through
C4
- Cooling Stages 1 through 4
CF1 & CF2 -
Condenser Fan Banks 1 and 2
X -
Controller Alarm is field-wired from the thermostat interface
board to signify a controller alarm has occurred.
Table 2: 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
VFD
FR
FR
Fan
VFD +
VFD -
Simplicity
12
18
53
55
P13-1
P14-1
P14-2
Wht
Blk
TB2
