FORM
ISN CONTROL
RECEIVED DATA (CONTROL DATA)
The Middle Market 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 pa- rameters 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 51 lists the 5 control parameters. These values are found under feature 54 on the ISN.
TABLE 51 – ISN RECEIVED DATA
ISN PAGE | CONTROL DATA |
|
|
P03 | SETPOINT |
P04 | LOAD LIMIT STAGE (0,1, 2) |
P05 | COOLING RANGE (DAT MODE ONLY) |
P06 | — |
P07 | START/STOP COMMAND |
P08 | — |
P09 | — |
P10 | HISTORY BUFFER REQUEST |
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” in 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 52 - 53 show the data values and page listings for this unit.
TABLE 52 – ISN TRANSMITTED DATA
ISN PAGE | TYPE | DATA |
P11 | ANALOG | LEAVING CHILLED LIQUID TEMP. |
P12 | ANALOG | RETURN CHILLED LIQUID TEMP. |
P13 | ANALOG | MIXED CHILLED LIQUID TEMP. |
P14 | ANALOG | DISCHARGE AIR TEMP. |
P15 | ANALOG | — |
P16 | ANALOG | AMBIENT AIR TEMP. |
P17 | ANALOG | — |
P18 | ANALOG | SYS 1 RUN TIME (SECONDS) |
P20 | ANALOG | SYS 1 DISCHARGE PRESSURE |
P21 | ANALOG | — |
P22 | ANALOG | — |
P23 | ANALOG | — |
P24 | ANALOG | SYS 1 |
P25 | ANALOG | |
P27 | ANALOG | SYS 2 RUN TIME (SECONDS) |
P28 | ANALOG | SYS 2 SUCTION PRESSURE |
P29 | ANALOG | SYS 2 DISCHARGE PRESSURE |
P33 | ANALOG | SYS 2 |
P35 | ANALOG | NUMBER OF COMPRESSORS |
P36 | DIGITAL | SYS 1 ALARM |
P37 | DIGITAL | SYS 2 ALARM |
P38 | DIGITAL | EVAPORATOR HEATER STATUS |
P39 | DIGITAL | EVAPORATOR PUMP STATUS |
P40 | DIGITAL | — |
P41 | DIGITAL | — |
|
|
|
3
YORK INTERNATIONAL | 109 |
