York YLPA 0115SE, Installation, Operation And Maintenance Manual

Page: 52 / 90

52
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
0-20mA Remote Signal
Jumper JP on the I/O board must be set to 20mA.
To calculate the chilled liquid setpoint for values
between 0mA and 20 mA use the following formula:
Setpoint = Local Chilled Liquid Se °Reset
°Reset = (mA signal x *Max Reset Value)/20
Example:
Local Chilled Liquid Setpoint = 43.5 °F
*Max Reset Value = 9.0 °F
Input Signal = 10 mA
°Reset = (10mA x 9.0 °F)/20 = 4.5 °F
New Setpoint = 43.5 °F +4.5 °F = 48.0 °F
4-20mA Remote Signal
Jumper JP on the I/O board must be set to 20mA.
To calculate the chilled liquid setpoint for values
between 4mA and 20 mA use the following formula:
Setpoint = Local Chilled Liquid Se °Reset
°Reset = ((mA signal - 4) x (*Max Reset Value))/16
Example:
Local Chilled Liquid Setpoint = 43.5 °F
*Max Reset Value = 10.8 °F
Input Signal = 8 mA
°Reset = ((8mA - 4mA) x 10.8 °F)/16 = 2.7 °F Reset
Setpoint = 43.5 °F + 2.7 °F = 46.2 °F
* Max Reset Value - Pressing the SETPOINTS key
a fifth time will allow the maximum remote EMS-
PWM cooling temperature reset to be programmed:
Programmable values are from 2 °F to 20°F.
MAX EMS-PWM REM C
TEMP RESET = +XX
°
F
This value is also used to set the maximum reset to
the cooling setpoint that corresponds to the maximum
analogue input (10V or 20ma).
Heating Mode
In the heating mode the hot liquid setpoint can be reset
downwards from the manually entered setpoint by
using a remote 0 - 10VDC or 2-10VDC or 0-20ma or
a 4-20mA signal connected to terminal block -XTBC1
terminals A- and A+. This is the same signal as used to
reset the cooling setpoint in the cooling mode. Whenever
a reset is called for by the remote signal, the change may
be viewed by pressing the Setpoints key four times. The
new value will be displayed as REM H SP = XXX °C.
0-10VDC Remote Signal
Jumper JP on the I/O board must be set to 10V.
To calculate the reset hot liquid setpoint for values
between 0VDC and 10VDC use the following formula:
Setpoint = Local Hot Liquid Setpoint - °Reset
°Reset = ((DC voltage signal) x (*Max Reset Value))/10
Example:
Local Hot Liquid Setpoint = 122 °F
*Max Reset Value = 18 °F
Input Signal = 6VDC
°Reset = (6VDC x 18 °F)/10 = 10.8 °F
New Setpoint = 122 °F - 10.8 °F = 111.2 °F
2-10VDC Remote Signal
Jumper JP on the I/O board must be set to 10V.
To calculate the reset Hot liquid setpoint for values
between 2VDC and 10VDC use the following formula:
Setpoint = Local Hot Liquid Setpoint - °Reset
°Reset = ((DC voltage signal - 2) x (*Max Reset
Value))/8
Example:
Local Hot Liquid Setpoint = 122 °F
*Max Reset Value = 18 °F
Input Signal = 6VDC
°Reset = ((6VDC - 2) x 18 °F)/8 = 9 °F
New Setpoint = 122 °F - 9 °F = 113 °F