JOHNSON CONTROLS
125
FORM 150.62-NM8 (1020)
3
FIG. 12 – FIELD AND FACTORY ELECTRICAL CONNECTIONS
OPTIONAL REMOTE TEMPERATURE RESET BOARD
If a 4-20mA signal is available, it is applied to terminals
A+ and A- and jumpers are applied to JU5 and JU3 on
the reset board. The mA signal is conditioned to a 1 to 11
second PWM output. The PWM output is then supplied
to the PWM input on the I/O Board at CTB1 terminals 13
and 20. 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 = 45° (7.22°C)
*Max Reset Value = 10°F (5.56°C)
Input Signal = 12 mA
(English)
°reset = 8mA x 10°F = 5°F reset
16
setpoint = 45°F + 5°F = 50°F
(Metric)
°reset = 8mA x 5.56°C = 2.78°C reset
16
setpoint = 7.22°C + 2.78°C = 10.0°C
If the contact closure input is used. The connec tions 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 convert
this contact closure to a PWM signal that is applied to
CTB1 terminals 13 and 20.
To set the PWM output, the contacts must be closed on
inputs C and D, and potentiometer R11 (located on the
front edge of the PC board) is adjusted to 10VDC 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 pro grammed in the Setpoints
section under the COOLING SETPOINTS key.
The coil of any added relay used for re
-
set must be suppressed to prevent pos
-
sible component damage. Use YORK
PN031-00808-000 suppres sor.
LD03875
A 240-24 Volt Ratio Transformer (T3)
is used to derive nominal 12 volt output
from the 120 volt supply.
* Max Reset Value is the “Max EMS-PWM Remote Temp. Reset” setpoint value described in the “
Setpoints Keys
” segment of Section 2 in this
IOM. Programmable values are from 2°F to 40°F (1.11°C to 22.2°C).
Содержание YCAL0014E Series
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