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53
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 Hot Liquid Setpoint - °Reset
°Reset = (mA signal x *Max Reset Value)/20
Example:
Local Hot Liquid Setpoint = 122 °F
*Max Reset Value = 9.0 °F
Input Signal = 10 mA
°Reset = (10mA x 9.0 °F)/20 = 4.5 °F
New Setpoint = 122 °F - 4.5 °F = 117.5 °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 20mA use the following formula:
Setpoint = Local Hot Liquid Setpoint - °Reset
°Reset = ((mA signal - 4) x (*Max Reset Value))/16
Example:
*Max Reset Value = 10.8 °F
Input Signal = 8 mA
°Reset = ((8mA - 4mA) x 10.8 °F)/16 = 2.7 °F Reset
Setpoint = 122 °F - 2.7 °F = 119.3 °F
* Max Reset Value - Pressing the SETPOINTS key
a sixth time will allow the maximum remote EMS-
PWM heating temperature reset to be programmed:
Programmable values are from 2 °F to 20 °F.
MAX EMS-PWM REM H
TEMP RESET = +XX °F
This value is also used to set the maximum reset to
the heating setpoint that corresponds to the maximum
analogue input (10V or 20ma).
EMS PWM Remote Setpoint Reset
The EMS-PWM feature is not normally available. If
the message REMOTE TEMP RESET INPUT (being
the analogue input) is visible under the OPTION key
even when set to DISABLED the EMS-PWM feature
is disabled. Contact Johnson Controls York product
service if you require this feature. If enabled this feature
will work even when the Option Local/Remote mode
is set to Local. This input is not available if a remote
communications device is connected, Option Local/
Remote is set to remote and remote communications
device is not releasing control to the panel.
The leaving liquid temperature setpoint programmed
into the microprocessor can be remotely adjusted
to a higher value cooling, or a lower value heating
using repeated timed closure of voltage free contacts
(terminals 13 & 20) on –XTBC1. The duration of the
contact closure will decide the amount of adjustment.
For noise immunity, the microprocessor will ignore
closures of less than 1 second.
The setpoint can also be reset by a remote 0-10VDC,
2-10VDC, 0-20ma DC or 4-20ma DC signal connected
to terminals A+ and A- on -XTBC1.
EMS-PWM Cooling Temperature Reset
Pressing the SETPOINTS a fifth time will allow the
maximum remote EMS-PWM cooling temperature reset
to be programmed:
MAX EMS-PWM REM C
TEMP RESET = +XX °F
The temperature reset value is the maximum allowable
reset of the cooling temperature SETPOINT. The
SETPOINT can be reset upwards by the use of a timed
contact closure on the PWM input (-XTBC1 terminals
13 - 20).
Pressing the UP arrow or DOWN arrow will change
the temperature reset value in 1.0°F increments. The
ENTER/ADV key must be pressed to enter the value
into memory.
Summary of Contents for YLPA 0115SE
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