Sanyo DE SANYO control system, Display and control board, H Generator temp 149 . 9 C, 236 C

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SANYO control system

The SANYO control system surpasses other proportional only control systems available today. The digital PID(proportional, integral, and dif- ferential) control maximizes unit performance by maintaining a ± 0.5° C deviation in leaving chilled water temperature from setpoint. Proportional controls typically can only maintain a ± 1° C deviation from setpoint. The controller's innovative design also incorporates the ability to start and stop the system chilled/hot and cooling water pumps. During shutdown these pumps are sequenced to insure a complete dilution cycle.

The leaving chilled water temperature is measured every five seconds and fuel input is changed according to the gradient of the leaving chilled water temperature curve. System temperatures, setpoints, and opera-

tional records are displayed along with indicator lights for the chiller, pumps and burner.

The SANYO control system offers its users self-diagnostics by constantly monitoring the chiller's status and will automatically shut the chiller down should a fault occur. The cause of shutdown will be retained in memory and can be displayed for immediate operator review. The controller's memory will also retain and display the cause of the last three system fault conditions. This method of retaining fault conditions is extremely useful for maintaining an accurate record of unit performance and fault history.

Display and control board

Table 2. Typical operation data

Temperature	High temperature generator
	Exhaust gas
	Chilled water
	Cooling water
	Hot water
Operation hours	Chiller / heater
	Combustion
	No.1 Absorbent pump
	Refrigerant pump
Message	Low level vacuum (Notice / Caution)

Display and control board

■Display(normal)

	High concentration (Notice / Caution)
	Foul tube of cooling water (Notice / Caution)
	High cooling water temperature (Notice / Caution)
	Foul chamber (Notice / Caution) (only for oil-fired types)
Set point	Chilled water
	Hot water
ON-OFF	Chiller / heater
	Burner

H Generator temp 149 . 9 ° C

Table 1.	Indication lamp
symbol	Name	Lamp color
	Running(Operation) indication lamp	Red
	Stop indication lamp	Green
	Alarm indication lamp	Orange
	Bunner combustion indication lamp	Red
	Cooling / Heating indication lamp	Orange
	Remote / Local select button with lamp	Red
	Mode select button with lamp	Red
	Data display	LCD

SETTING	STOP RUN	COOLING	BURNER
	CHILLER	HEATING	ALARM
	REF PUMP	BUZZER STOP
	#1 ABS PUMP	MODE
	#2 ABS PUMP	OPERATION	REMOTE
	PURGE PUMP
	BURNER BLOWER	STOP	LOCAL

Sample 1.
Exhaust gas temp	236° C
CH W temp	12.3 7.1° C

Sample 2.

Notice : Low level vacuum

Caution : Foul tube of COW

Table 3. Typical alarm data

Operation alarm	Generator solution level
	Thermal relay of No.1 Absorbent pump
	Thermal relay of No.2 Absorbent pump
	Thermal relay of burner blower
	Thermal relay of oil pump
	Thermal relay of refrigerant pump
	Interlock of chilled water pump
	Interlock of hot water pump
	Interlock of cooling water pump
	Interlock of system
	Generator pressure
	Chilled water flow rate
	Hot water flow rate
	Generator temperature
	High concentration
	Purge tank pressure sensor
	Solution temp sensor
Others	Condensed refrigerant temp sensor
	Generator temp sensor
	Chilled water sensor
	Hot water sensor
	Cooling water sensor
	Refrigerant temp sensor
	Power failure

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