Let me introduce our manifold gauge to you. We will need this product in our daily refrigerant filling work. The application is for R134a from 600 psi to 3000 psi, we also offer 3 refrigerant filling hoses with 1.5m length, 1 pair of adjustable high and low pressure R134a couplers, 1/4″SAE can tap valve, valve core remover, all of them are packed in plastic box. Let’s take a look at them one by one.
The manifold can be customized to other styles, for other refrigerants such as R12 R404…
Here are 3 hoses in this box, the colors are red yellow and blue. All come with copper connector, which makes it a strong corrosion resistance.
This is the can tap valve, it is made of alloy material, you can use it to open the refrigerant can.
Here is one pair of high and low pressure quick couplers for R134a. The blue is a low-pressure speed-adjusting coupler, the red is a high-pressure speed-adjusting coupler, and they are all made of alloy material too.
Let’s see the steps of filling the refrigerant from the low pressure end:
- First connect the manifold pressure gauge with the compressor and refrigerant cylinder
- Open the refrigerant cylinder, loosen the nut of the injection hose on the manifold pressure gauge until you hear the sound of refrigerant gas flowing, then tighten the nut to discharge the air in the injection hose.
- Open the low-pressure valve to let the refrigerant enter the system. When the system pressure reaches 0.4MPa, close the low-pressure valve.
- Start the engine, turn on the air conditioner switch, and adjust both the blowerswitch and the temperature control switch to maximum.
- Open the valve on the pressure gauge of the manifold and let the refrigerant continue to enter the refrigeration system until the filling amount reaches the specified value.
- After adding the specified amount of refrigerant to the system, observe from the sight glass, if there is no air bubbles or excessive refrigerant, then adjust the engine speed to 2000 rpm, and the blower to the highest level. Finally check if the low pressure and the high pressure are normal.
Attention: After the refrigerant is charged, close the low pressure valve on the manifold pressure gauge, close the injection valve on the refrigerant cylinder, stop the car engine, and remove the manifold pressure gauge from the compressor. This action should be rapid to avoid leakage of refrigerant.