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4.3.
diAgnoSing SyStem oPerAtion
4.3.1.
Ensure both hand-wheels are closed (turn fully clockwise) and connect the blue low side hose to the A/C system's low pressure
side service port. Connect the red high side hose to the A/C system's high pressure side service port. (Already done in section 4.1).
4.3.2.
With the manifold hand-wheels closed (fully clockwise), read the pressures on each gauge.
4.3.3.
Compare these pressures and temperatures to the A/C system manufacturer's specifications for proper operation.
4.3.4.
If the system is within the correct operating guidelines, disconnect the manifold hoses from the system (close both hand wheels and
couplers before removing). If repairs are necessary, follow the steps for recovering, evacuating and recharging the system.
4.4.
reCoVering refrigerAnt
note:
Refrigerant should not be exhausted to the atmosphere.
4.4.1.
ensure the blue low side hose is connected to the A/C system's low side service port, the red high side hose is connected to the
A/C system's high side service port and the yellow centre hose connects to the inlet of the recovery unit. Set up as in fig.1.
4.4.2.
Follow the instructions provided with the recovery unit for proper recovery of refrigerant from the A/C system.
4.5.
eVACuAting And ChArging A refrigerAnt SyStem
4.5.1.
See section 4.1 (Connecting quick couplers) before proceeding. Connect the blue low side hose to the A/C system's low side
service port. Connect the red high side hose to the A/C system's high side service port.
4.5.2.
Check the manifold gauge pressure reading to be sure the A/C system has been recovered properly. If not, follow steps under
Section 4.3 (Recovering Refrigerant). If it has, connect the centre yellow charging hose to a vacuum pump. Set up as in fig.1.
4.5.3.
Open the high and low side hand-wheels (fully anti-clockwise) and start the vacuum pump.
4.5.4.
After evacuating the system according to the manufacturer's specifications, close both the high and low side hand-wheels and turn
off the vacuum pump.
4.5.5.
disconnect the yellow hose from the vacuum pump and connect it to the refrigerant supply.
4.5.6.
Slightly open the refrigerant supply valve. Remove the valve cap (fig.2) and purge air from the yellow charging hose at the manifold
according to manufacturer's recommendations, then close the supply valve.
4.5.7.
You can now charge the A/C system according to the manufacturer's specifications.
• If the system specifications call for ChArging on the high Side, close the manifold's blue low side hand-wheel, open
the refrigerant supply valve and open the manifold's red high side hand-wheel. To find out when to cease adding refrigerant keep
an eye on the sight glass (fig.2), when bubbles stop appearing, close the manifold's red high side hand-wheel and close the refrigerant
supply valve.
• If the system specifications call for ChArging on the low Side, close the manifold's red high side hand-wheel, open
the refrigerant supply valve and open the manifold's blue low side hand-wheel. To find out when to cease adding refrigerant keep
an eye on the sight glass (fig.2), when bubbles stop appearing, close the manifold's blue low side hand-wheel and close the refrigerant
supply valve.
4.5.8.
When you have charged the system, close both manifold hand-wheels. let the compressor run and check the manifold's gauge
pressure readings to be sure the system is operating properly. If it is not, adjust the system as necessary. To disconnect
the manifold when the system is operating correctly, first close the high side coupler valve, then disconnect the red high
quick coupler from the A/C system.
4.5.9.
Restart the A/C system, then open both manifold hand-wheels. Refrigerant from both hoses will be drawn quickly into the A/C
system through the blue low side hose.
4.5.10.
When both gauges show the lowest operating pressure recommended by the manufacturer, close the low side valve and turn off
the A/C system.
4.5.11.
Close the low side coupler valve and disconnect the low side hose from the A/C system.
5. mAintenAnCe
5.1.
Keep the manifold in good working order.
5.2.
Periodically replace O-rings and valve seats.
5.3.
Be sure to lubricate o-rings with high vacuum
grease.
5.4.
Generally keep the manifold clean from dirt and
grime to improve product life.
© Jack Sealey limited
fig.2
Original Language Version
VSAC002.V2 Issue 2 05/02/19
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