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Tech Tips
General
1. Vacuum pumps are not refrigerant recovery machines and should
not be used for recovering refrigerant.
2. Purge the A/C system with a few psi of dry nitrogen before
evacuation to pre-dry the system. This extra step actually saves
time overall because it quickly removes a great amount of
moisture, oil, and other contaminants before you even connect
your pump.
3. Performing a triple evacuation is a great way to ensure a system
is dry. The nitrogen flow can help carry moisture with it out of the
system. A triple evacuation is as follows:
1. Purge with nitrogen
2. Evacuate down to 2000 microns
3. Purge with nitrogen
4. Evacuate down to 1000 microns
5. Purge with nitrogen
6. Evacuate down to below 500 microns
Cold Weather Starts
1. Open an unused input port to ambient for a few seconds until the
pump is running.
2. Warm the pump in your truck/home by letting it sit in a warm
environment. You can warm the oil in your truck/home before
adding it to the pump.
Setup
1. Always use fresh Fieldpiece vacuum pump oil. If oil is left in the
pump for more than a week, the oil may have absorbed enough
moisture from ambient air to affect performance.
2. Refrigerant manifolds can be convenient to charge the system
after evacuation, but their hoses and valves can limit or slow
evacuation. It’s best to use vacuum rated hoses, directly
connected to core removal tools at the service ports.
3. If you want to use a manifold, it’s best to use a 4 port manifold. 4
port manifolds typically have a larger bore to increase flow. They
also isolate the pump from the system and micron gauge without
the need of a shut-off valve on the hose.
4. Hoses:
Short as possible.
Widest diameter as possible.
Vacuum rated.
Core depressors removed.
Ball valve shut-offs instead of low loss fittings.
Good seals.
Replace if worn.
5. Use a vacuum rated Schrader valve core removal tool to
temporarily remove valve cores from service ports.
6. Connect multiple hoses to the inline ports on VPX7/VP87/VP67 to
further decrease hose restriction and increase air flow.
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