York YCAS0130 manual ISN Control, ISN Received Data, ISN Transmitted Data, 189

FORM 201.19-NM1 (204)

8.12 ISN CONTROL

RECEIVED DATA (CONTROL DATA) TRANSMITTED DATA

8

The microprocessor 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. Table 12 lists the 4 control parameters. These values are found under feature 54 on the ISN.

TABLE 12 – ISN RECEIVED DATA

ISN	CONTROL DATA
PAGE
P03	SETPOINT
P04	ISN Current Limit
P05	—
P06	—
P07	START/STOP COMMAND (0 = STOP, 1 = RUN)
P08	—
P09	—
P10	HISTORY BUFFER REQUEST
	(0 = CURRENT DATA, 1 = LAST HISTORY 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 06. 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 13 and 14 show the data values and page listings for this unit.

TABLE 13 – ISN TRANSMITTED DATA

ISN	Character	Type	DXST Chiller Data
Page
P11	8-11	Analog	Leaving Chilled Liquid Temp
P12	12-15	A	Return Chilled Liquid Temp
			Mixed Chilled Liquid Temp (optional) - YCAS
P13	16-19	A	Leaving Hot Liquid Temp - YCWS
			Hot Liquid Temp - Heat Recovery
P14	20-23	A	Sys 1 Suction Temperature
P15	24-27	A	Sys 1 Discharge Temperature
P16	28-31	A	Ambient Air Temperature
P17	32-35	A	Sys 1 Oil Temperature
P18	36-39	A	Sys 1 Oil Pressure
P19	40-43	A	Sys 1 Suction Pressure
P20	44-47	A	Sys 1 Discharge Pressure
P21	48-51	A	Sys 1 % Full Load Amps
P22	52-55	A	Sys 1 Total Run Hours
P23	56-59	A	Sys 1 Total Number of Stats
P24	60-63	A	Sys 1 Anti-Recycle Timer
P25	64-67	A	Anti-Coincident Timer
P26	68-71	A	Sys 2 Oil Temperature

YORK INTERNATIONAL 189