Isuzu KB P190. Manual - part 17

1-34  HEATER AND AIR CONDITIONING 

 
 

REFRIGERANT RECYCLING 

Recycle the refrigerant recovered by ACR

4

 or equivalent. 

For the details of the actual operation, follow the steps in the 

ACR

4

 Manufacturer's Instructions. 

ACR

4

 (115V 60Hz)  :5-8840-0629-0 (J-39500-A) 

ACR

4

 (220-240V 50/60Hz) 

 

: 5-8840-0630-0 (J-39500-220A) 

ACR

4

 (220-240V 50/60Hz Australian model) 

 

: 5-8840-0631-0 (J-39500-220ANZ) 

 

F06R300014 

 

 
 

EVACUATION OF THE REFRIGERANT 

SYSTEM 

NOTE: 
Explained below is a method using a vacuum pump. Refer 

to the ACR

4

 (or equivalent) Manufacturer's Instructions 

when evacuating the system with ACR

4

 (or equivalent). 

 

Air and moisture in the refrigerant will cause problems in the air 

conditioning system. 

Therefore, before charging the refrigerant, be sure to evacuate 

air and moisture thoroughly from the system. 

1)  Connect the gauge manifold. 

••••  High-pressure valve (HI) - Discharge-side 
••••  Low-pressure valve (LOW) - Suction-side 

2)  Discharge and recover the refrigerant. 

3)  Connect the center hose of the gauge manifold set to the 

vacuum pump inlet. 

4)  Operate the vacuum pump, open shutoff valve and then 

open both hand valves. 

5)   When the low-pressure gauge indicates approx.  100kPa 

(750 mmHg/30 inHg), continue the evacuation for 5 minutes 

or more. 

6)  Close both hand valves and stop the vacuum pump. 

 
 

 

7)  Check to ensure that the pressure does not change after 10 

minutes or more. 
••••  If the pressure changes, check the system for leaks. 
••••  If leaks occur, retighten the refrigerant line connections 

and repeat the evacuation steps. 

8)  If no leaks are found, again operate the vacuum pump for 

20 minutes or more. After confirming that the gauge 

manifold pressure is at 100 kPa (750 mmHg/30 inHg), close 

both hand valves. 

9)  Close positive shutoff valve. 

 

Stop the vacuum pump and disconnect the center hose 

from the vacuum pump. 

 

HEATER AND AIR CONDITIONING  1-35 

 

CHARGING THE REFRIGERANT SYSTEM

There are various methods of charging refrigerant into the air 
conditioning system. 
These include using the ACR

4

 (HFC-134a Refrigerant 

Recovery/ Recycling/Recharging/System) or equivalent and 
direct charging with a manifold gauge charging station. 
ACR

4

 (115V 60Hz) : 5-8840-0629-0 (J-39500-A) 

ACR

4

 (220-240V 50/60Hz) 

  : 

5-8840-0630-0 

(J-39500-220A) 

ACR

4

 (220-240V 50/60Hz Australian model) 

  : 

5-8840-0631-0 

(J-39500-220ANZ) 

F06R300012 

 

Charging procedure 

•••• ACR

4

 (or equivalent) method 

For the charging of refrigerant recovered by ACR

4

, follow the 

Manufacturer's Instruction. 
 

1-36  HEATER AND AIR CONDITIONING 

 

F06R300013 

 

 

 
 

••••  Direct charging with a manifold gauge charging 

station method. 

Handling the charging valve handle when installing refrigerant 

container. 

1)  Before attaching the charge valve to the refrigerant 

container, turn the charge valve handle counterclockwise 

until the needle is fully retracted. 

2)  Turn the plate nut counterclockwise until it reaches its 

highest position relative to the charge valve. 

3)  Install the charge valve onto the refrigerant container. 

4)  Turn the plate nut clockwise and connect the center hose of 

the manifold gauge to the charge valve. 

5)  Tighten the plate nut sufficiently by hand. Then turn the 

charge valve handle clockwise to lower the needle and bore 

a hole in the refrigerant container. 

6)  Turn the charge valve handle counterclockwise to raise the 

needle.  The refrigerant in the refrigerant container is 

charged into the air conditioning system by the operation of 

the manifold gauge. 

••••  Be absolutely sure not to reuse the emptied 

HEATER AND AIR CONDITIONING  1-37 

refrigerant container. 

 
 

 

1)  Make sure the evacuation process is correctly completed. 

2)  Connect the center-hose of the manifold gauge to the 

refrigerant container. 
••••  Turn the charge valve handle counterclockwise to purge 

to the charging line and purge any air exiting in the 

center-hose of the manifold gauge. 

3)  Open the low-pressure hand valve and charge the 

refrigerant about 200 g (0.44 lbs.). 
••••  Make sure the high-pressure hand valve is closed. 
••••  Avoid charging the refrigerant by turning the refrigerant 

container upside down. 

4)  Close the low-pressure hand valve of the manifold gauge. 

••••  Check to ensure that the degree of pressure does not 

change. 

5)  Check the refrigerant leaks by using a HFC-134a leak 

detector. 
••••  If a leak occurs, repair the leak connection, and start all 

over again from the first step of evacuation. 

6)  If no leaks are found, open the low-pressure hand valve of 

the manifold gauge. Then continue charging refrigerant to 

the system. 
••••  When charging the system becomes difficult: 

(1) Run the engine at Idling and close the all vehicle 

doors. 

(2) A/C switch is "ON". 

(3) Set the fan control knob (fan switch) to its highest 

position. 

(4) Set air source selector lever to “RECIRC” 

 

 
 

WARNING 
BE ABSOLUTELY SURE NOT TO OPEN THE HIGH-

PRESSURE HAND VALVE.  SHOULD THE HIGH-

PRESSURE HAND VALVE BE OPENED, THE HIGH-

PRESSURE REFRIGERANT GAS WOULD FLOW 

BACKWARD, AND THIS MAY CAUSE THE REFRIGERANT 

CONTAINER TO BURST. 

7)  When the refrigerant container is emptied, use the following 

procedure to replace it with a new refrigerant container. 

(1) Close the low-pressure hand valve. 

(2) Raise the needle upward and remove the charge valve.

(3) Reinstall the charge valve to the new refrigerant 

container. 

(4) Purge any air existing in the center hose of the manifold 

gauge.