Danfoss AK-PC 782A Data sheet

Data Sheet

Pack controller

Type AK-PC 782A

One controller for the entire CO2 booster pack.

The flexible AK-PC 782A pack controller delivers highest efficiency.

AK-PC 782A is a powerful and flexible controller that provides precise regulation, improved efficiency, and enhanced user friendliness for pack control in transcritical CO2 booster packs.

The controller flexibility and efficiency makes it the obvious choice for all sizes of packs in all climates.

AI227786437213en-000401

Pack controller, type AK-PC 782A

Features

•One controller for the entire CO2 booster pack

•Robust algorithms warrant safe initial start up and reliable operation

•Easy ƒrst-time use with wizard-like set-up

•Scalable to control large booster packs with up to 12 compressors

•Supports variable speed, digital scroll, CRII, Stream and unloader compressors

•Speed control of up to 2 compressors per suction group

•Best ƒt step control handles mixed compressor sizes

•Control of oil separator and oil receiver

•Liquid injection into suction line option

•Gas cooler capacity control of up to 8 fans

•Gas cooler temperature optimisation with regard to ambient temperature

•Optimal high pressure control

•Improved energy efficiency with Danfoss Multi EjectorTM

•Receiver pressure management with four 4 control modes

•Parallel compressor control with model based Smart IT start

•Setpoint management ensuring safe and reliable operation

•Heat recovery management for tap water and space heating

•Support for external Air Conditioning unit KPI and COP calculation to compare and benchmark system efficiency

•General purpose functions with Quick Application Selection for independent control functions

•Local and remote alarm management with readable text descriptions

•Built in RS485 Lon communication

•Suction pressure optimisation of for the most heavily loaded refrigeration area

•Injection ON: stop case regulation in case of serious compressor alarms in the rack

Product speci€cation

Technical data

Table 1: Technical data

	Features	Description
	Supply voltage	24 V DC / AC ± 20%
	Power consumption	8 V A
	Analogue inputs	Pt 1000 ohm / 0 °C	Dissolution: 0.1 °C
			Accuracy: ± 0.5 °C
		Pressure transmitter type AKS 32R / AKS	Dissolution 1 mV
		2050 / AKS 32 (1 – 5 V)	Accuracy ± 10 mV
			Max. connection of 5 pressure transmitters on one module
			On at R < 20 ohm
		Contact function (ON / OFF)	O‡ at R > 2K ohm
			(Gold plated contacts not necessary)
	ON / OFF supply voltage inputs	Low voltage	OFF : U < 2 V
		0 / 80 V AC / DC	ON: U > 10 V
		High voltage	OFF : U < 24 V
		0 / 260 V AC	ON: U > 80 V
	Relay outputs SPDT	AC-1 (ohmic)	5 A
		AC-15 (inductive)	3 A
		U	Min. 24 V - Max. 230 V
			Low and high voltage must not be connected to the same output group
	Solid state outputs	Can be used for loads that are frequent-	Max. 240 V AC, Min. 48 V AC - Max. 0.5 A
		ly cut in and out e.g. unloaders, sole-	Leak < 1 mA
		noid valve
			Max. 1 AKV
	Ambient temperature	During transport	-40 – 70 °C
		During operation	-20 – 55 °C
			0 – 95% RH (non condensing) - No shock influences / vibrations

© Danfoss | Climate Solutions | 2021.11

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