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JOHNSON CONTROLS
154
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 10 – MAINTENANCE
ISN CONTROL
Received Data (Control Data)
The unit receives 8 data values from the ISN. The first
4 are analog values and the last 4 are digital values.
These 8 data values are used as control parameters
when in REMOTE mode. When the unit is in LOCAL
mode, these 8 values are ignored. If the unit receives
no valid ISN transmission for 5 minutes, it will revert
back to all local control values.
lists the 5 control parameters. These values are found
under feature 54 on the ISN.
TABLE 39 -
ISN RECEIVED DATA
ISN
PAGE
CONTROL DATA
P03
Setpoint Cooling
P04
Load Limit Stage (0,1, 2)
P05
—
P06
—
P07
Start/Stop Command
(0 = Stop, 1 = Run)
P08
—
P09
—
P10
History Buffer Request
(0 = Current Data, 1 = Last History Data)
Transmitted Data
After receiving a valid transmission from the ISN, the
unit will transmit either operational data or history buf-
fer data depending on the “History Buffer Request” on
ISN PAGE 10. Data must be transmitted for every ISN
page under feature 54. If there is no value to be sent
to a particular page, a zero will be sent.
show the data values and page listings for
this unit.
ISN PAGES listed are ENG PAGE REF-
ERENCES and must be decoded to the
corresponding PAGE REF point map re-
lated to the communications protocol type
utilized. The latest point map information
is listed on the Johnson Controls Group
Equipment Integration website.
TABLE 40 -
ISN TRANSMITTED DATA
ISN
PAGE CHARACTER TYPE
DATA
P11
8-11
Analog Leaving Chilled
Liquid Temp.
P12
12-15
Analog Return Chilled
Liquid Temp.
P13
16-19
Analog ----
P14
20-23
Analog ----
P15
24-27
Analog SYS 1 Suction Temp.
(EEV Only)
P16
28-31
Analog Ambient Air Temp.
P17
32-35
Analog
SYS 1 Suction
Superheat
(EEV Only)
P18
36-39
Analog SYS 1 Run Time
(Seconds)
P19
40-43
Analog SYS 1 Suction
Pressure
P20
44-47
Analog SYS 1 Discharge
Pressure
P21
48-51
Analog ----
P22
52-55
Analog ----
P23
56-59
Analog SYS 1 EEV Output %
(EEV Only)
P24
60-63
Analog SYS 1
Anti-Recycle Timer
P25
64-67
Analog Anti-Coincidence
Timer
P26
68-71
Analog SYS 2 Suction Temp.
(EEV Only)
P27
72-75
Analog SYS 2 Run Time
(Seconds)
P28
76-79
Analog SYS 2
Suction Pressure
P29
80-83
Analog SYS 2
Discharge Pressure
P30
84-87
Analog ----
P31
88-91
Analog ----
P32
92-95
Analog
SYS 2
Suction Superheat
(EEV Only)
P33
96-99
Analog SYS 2
Anti-Recycle Timer
P34
100-103
Analog SYS 2 EEV Output %
(EEV Only)
P35
104-107
Analog # of Compressors
P36
108
Digital SYS 1 Alarm
Summary of Contents for YLUA0078
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