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FIG. 12 – FIELD AND FACTORY ELECTRICAL CONNECTIONS
OPTIONAL REMOTE TEMPERATURE RESET BOARD
(Metric)
6 VDC x 11. 1°C
°reset =
10
setpoint = 12.8°C + 6.6°C = 19.4°C
*
Max Reset Value is the "Max EMS-PWM Remote Temp. Reset"
setpoint values described in the programming section under
Cooling Setpoints. Programmable values are from 2°F to 40°F
(1.1°C to 22.2°C.)
If a 4 - 20 mA signal is available, it is applied to termi-
nals A+ and A- and jumpers are applied to JU5 and
JU3 on the reset board. The mA signal is conditioned
to a 1-11 second PWM output. The PWM output is then
supplied to the PWM input on the microboard at CTB1
terminals 13 - 20. To calculate the discharge air tem-
perature setpoint for values between 4 mA and 20 mA
use the following formula:
setpoint = discharge air temperature setpoint + °reset
°reset = (mA signal - 4) x (*Max Reset Value)
16
Example:
Local Disch. Air Temp. Setpoint = 55° (12.8°C)
*Max Reset Value = 10°F (5.6°C)
Input Signal = 12 mA
(English)
8 mA x 10°F
°reset =
= 5°F reset
16
setpoint = 55°F + 5°F = 60°F
YORK INTERNATIONAL
+
–
= 6.6°C reset
(Metric)
8 mA x 5.6°C
°reset =
= 2.8°C reset
16
setpoint = 12.8°C + 2.8n°C = 15.6°C
*
Max Reset Value is the "Max EMS-PWM Remote Temp. Reset"
setpoint values described in the programming section under
Cooling Setpoints. Programmable values are from 2°F to 40°F
(1.11°C to 11.11°C).
If the Contact Closure input is used. The connections
are made to terminals C and D and only jumper JUI
must be in place on the reset board. This input is used
when a single reset value is needed. When the contacts
are closed, the remote temperature reset board will con-
vert this contact closure to a PWM signal that is ap-
plied to CTB1 terminals 13 - 20.
To set the PWM output, the contacts must be closed on
inputs C - D, and potentiometer R11 (located on the
front edge of the PC board) is adjusted to 10 VDC as
measured at TP3 to terminal 10 on the circuit board.
The reset value will be the "Max EMS-PWM Remote
Temp. Reset" setpoint value programmed in the
SETPOINTS section under the Cooling Setpoints key.
The coil of any added relay used for
reset must be suppressed to prevent
possible component damage. Use
YORK P/N 031-00808-000 suppressor.
FORM 150.63-NM1
035-15961-000
LD05633
3
129
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