JOHNSON CONTROLS
151
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
8
ANALOG INPUT OPERATION
This section describes the control operation of the (29)
twenty-nine analog inputs. These inputs are used by
the control to monitor and respond to unit tempera-
tures, pressures, enthalpy, etc. The location of each of
these connections on the Unit Controller is contained
in
. Notice that the ID gives the
jack connection designated as “J” and then the iden-
tifying number of the connector, followed by a – and
then the pin number of the connector. For example the
SUPPLY AIR TEMPERATURE analog input would be
found at J1-1. This is connector J1 – Pin 1. As the Unit
Control board is positioned in the control box the top
row of the J series connectors is the input, the middle
row is the common, and the bottom row is the 5VDC
input to the sensor. Also the pin in the right hand top
corner is pin 1.
Temperature Sensors
The temperature sensors are all 10K Type III Thermis-
tors. The relationship between the temperature and the
voltage output and resistance is contained in
. The following analog inputs are of this
type:
•
Supply Air Temperature
•
Heat Entering Temp
•
Flex Evap Temp
•
Outside Air Temp
•
Return Air Temp
•
Suction Temp #1
•
Suction Temp #2
•
Zone Temp
•
Under Floor Temp
Duct Pressure Transducer
The Duct Pressure Transducer is located behind the
right hand damper door. The purpose of the transducer
is to sense and convert the static pressure in the sup-
ply-side of the duct to a 0 to 5VDC voltage. The DC
voltage is sent to the Unit Controller and compared
against the “DUCT STATIC PRESS ACTIVE SP”.
The transducer is factory wired, but pneumatic tubing
must be field supplied and installed (refer to
in this manual). The Duct Static
Pressure Transducer measures differential pressure be-
tween the pressure in the duct and atmospheric pres-
sure. When verifying transducer operation, the tech-
nician must insert a tee in the pneumatic tubing and
connect a manometer to the tee to verify the pressure
being applied to the transducer. Once this pressure is
known, a comparison can be made of the duct pres-
sure vs. output VDC from the transducer.
shows the relationship between the pressure
applied to the duct pressure transducer and the output
voltage. The output is linear between 0" WC and the
SPAN. The “DUCT PRESS TRANSDUCER SPAN”
can be set to 1.25, 2.5 or 5" WC. The “DUCT PRESS
TRANSDUCER SPAN” must always be set based on
the span of the transducer installed.
SECTION 8 – SERVICE
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