Table 31 - T'stat Interface Board Voltage Outputs; Output - York eco2 050 Installation Operation & Maintenance

Primary Unit Controller Analog Outputs
The Primary Unit Controller has six analog outputs that
send a 0 to 10 volt DC signal to the respective actua-
tor. Table 33 shows the analog outputs designated as
AO1 through AO6, and the respective func tion. Note
the outputs are speed reference signals to he supply fan
VFD, ex haust fan VFD or exhaust damper, damper ac-
tuators for out side air/return air dampers, air measuring
damp ers, and heat ing valve. The 0 to 10 volt DC output
would be lin ear over the respective actuator range of
travel, or over the VFD frequency range of 0 to 60 Hz.
As an ex am ple, if the output to the outside air damper
actuator were 5 volts DC, the outside air damper actua-
tor would be driven to one-half of its range of travel.
An oth er ex am ple would be a 4 volt DC voltage sent to
the supply fan VFD as the speed reference signal. This
would "drive" the VFD to 24 hertz [(voltage reference
signal X 60) / 10 volts]. The actuator connections are:
Terminal 1 = 24VAC Common
Terminal 2 = 24VAC, and
Terminal 5 = 0 - 10VDC signal.
Primary Unit Controller Binary Outputs
The Primary Unit Controller has 10 binary outputs that
switch 24 volt AC to relays to cycle compressors, sup-
ply fan, ex haust fan, etc (refer to unit wiring diagram).
The out puts are "dry contact" relays on-board the unit
con trol ler (Primary Unit Controller) that will output
24 volts when en er gized by the unit controller. The 24
volt AC output will then en er gize the respective relays.
Table 33 lists the out put designations.
YORK INTERNATIONAL
Optional Thermostat Interface Board
(See Fig. 53)
There are no Þ eld connections required to the ther mo stat
interface board. Any ther mo stat that is Þ eld wired will
be connected at CTB1 in the control panel of the rooftop
unit and not to the thermostat interface board.
The thermostat interface provides the in ter face from an
ordinary two-stage heat, two-stage cool thermostat to the
Primary Unit Controller. The function of the thermostat
in ter face board is to covert the thermostat inputs, which
are basically binary inputs, to one analog output that con-
nects to the Primary Unit Controller at analog input TSAO
(J10-4). The DC voltage output for respective ther mo stat
in puts is shown in Table 31.
TABLE 31 – THERMOSTAT INTERFACE BOARD
VOLTAGE OUTPUTS
ANALOG W2 W1

OUTPUT

0.0 Fault Fault
0.5 OFF OFF
1.0 OFF OFF
1.5 OFF OFF
2.0 OFF OFF
3.0 ON OFF
4.0 OFF ON
5.0 ON ON
Binary "pass-through" Connections.
Four of the T'stat interface board inputs, G, OCC, SD,
Smoke Purge are connected directly from the Þ eld
installed T'stat to the Primary Unit Controller binary
inputs (refer to Bi na ry Inputs). These inputs are still
routed through the T'stat Interface board along with the
other T'stat inputs, but they only use the T'stat Interface
Board as a con nect ing point. Table 32 lists the connec-
tions and func tions.
FORM 100.50-NOM1 (604)
Y1 Y2
Fault Fault
ON ON
ON OFF
OFF ON
OFF OFF
OFF OFF
OFF OFF
OFF OFF
127
8