Specifications

JOHNSON CONTROLS
170
FORM 150.72-NM1 (908)
Maintenance
Received Data (Control Data)
The unit receives 8 data values from the ISN. The rst
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. Table 28 lists the 5 control
parameters. These values are found under feature 54
on the ISN.
ISN CONTROL
TABLE 29 – 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
P37 109 Digital SYS 2 Alarm
Transmitted Data
After receiving a valid transmission from the ISN, the
unit will transmit either operational data or history buffer
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. Tables 36 and 37
show the data values and page listings for this unit.
     

    
-


  

TABLE 28 – ISN RECEIVED DATA
ISN
CONTROL DATA
PAGE
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)