Drain, evacuate and recharge air conditioning, check for proper operation and check for leaks - AR83.30-P-1760YF

MODEL 176, 231, 246 with CODE 2U8 (Refrigerant R-1234yf) 

Shown on MODEL 246 

Fig 1: High/Low Pressure Pipes And Filling Connections - Shown On Model 246

Courtesy of MERCEDES-BENZ USA

	Risk of explosion  caused by welding or soldering work on closed air conditioning system. Risk of poisoning  caused by inhaling overheated refrigerant vapors. Risk of injury  to skin and eyes caused by contact with liquid refrigerant.	Do not perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been drained.	AS83.00-Z-0001-01A
	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-P-0005-01A
	Procedure for a damaged or leaky air conditioning system		AH83.30-N-0004-01A
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Draining
1	Analyze refrigerant in A/C system
	000 588 04 82 00 Air conditioning service unit		WS83.00-P-0031B
		Perform refrigerant analysis using an analysis device integrated into the air conditioning service unit or an external analysis device with data transfer to the air conditioning service unit. After a positive gas analysis: Extraction of refrigerant from air conditioning system into internal air conditioning service unit container. After a negative gas analysis: Perform the gas analysis up to three times. After a third negative gas analysis, verify the analysis device in accordance with the operator's manual. If the analysis device is functional and the gas analysis negative, extract the refrigerant from the A/C system and store it in a recycling vessel.
2	Connect filler connection (2) of air conditioning service unit to high pressure line (1) and filler connection (3) of air conditioning service unit to low-pressure line (4)
3	Suction off refrigerant	Note down extracted quantity of refrigerant oil in refrigerant circuit. When operating the air conditioning service unit, proceed in accordance with the operator's manual from the manufacturer.
4	Install new desiccant cartridge	Model 231 with code 2U8 (Refrigerant R-1234yf)	AR83.30-P-6521RK
		Model 176, 246 with code 2U8 (Refrigerant R-1234yf)	AR83.30-P-6521NKB
	Evacuate
5	Clean refrigerant and evacuate refrigerant circuit
6	Conduct vacuum test using air conditioning service unit
	Filling
7	Add new compressor oil to the refrigerant circuit according to the quantity of refrigerant oil noted during extraction	Use approved compressor oil only. If it is proven that a different compressor oil has been used, we will refuse to reimburse costs within the warranty and goodwill period. Daimler AG reserves the right to perform reexaminations. Correct quantity of refrigerant oil in refrigerant circuit. In the event of an incorrectly measured quantity of refrigerant oil, the refrigerant compressor may be damaged. Depending on the repair case, the quantity of refrigerant oil must be corrected accordingly: ↓
		Correct oil level in air conditioning system if system is suddenly drained	AR83.30-P-5253NKB
		Correct oil level in air conditioning system after replacing parts	AR83.30-P-5252NKB
		Correct oil level in air conditioning system in the event of repair or slow refrigerant loss	AR83.30-P-5251NKB
8	Charge air conditioning system	Model 176 with engine 270, 607, 651 with code 2U8 (Refrigerant R-1234yf) Model 231 with code 2U8 (Refrigerant R-1234yf) Model 246 with engine 270, 651 with code 2U8 (Refrigerant R-1234yf) Filling capacity - air conditioning/automatic air conditioning	*BF83.00-P-1002-01K
9	Conduct pressure test using air conditioning service unit	In the event of a pressure drop during the pressure test: ↓ Check air conditioning system for leakage
			AR83.30-P-1761NKP
10	Disconnect filler connection (2) of air conditioning service unit from high pressure line (1) and filler connection (3) of air conditioning service unit from low-pressure line (4)

AIR CONDITIONING/AUTOMATIC AIR CONDITIONING

Number	Designation			Model 176 with engine 270, 607, 651	Model 231
BF83.00-P-1002-01K	Filling capacity - air conditioning/automatic air conditioning	Refrigerant R1234yf	g	650	550

AIR CONDITIONING/AUTOMATIC AIR CONDITIONING

Number	Designation			Model 246 with engine 270, 607, 651
BF83.00-P-1002-01K	Filling capacity - air conditioning/automatic air conditioning	Refrigerant R1234yf	g	650