OPERATING INSTRUCTIONS FOR
ATD-3410 AIR OPERATED VACUUM PUMP
OPERATING INSTRUCTIONS:
This pump is designed to evacuate unwanted air and moisture
from the air conditioning system. A system that has been opened
for repairs, or one that is found to be excessively low on refriger-
ant MUST BE FULLY EVACUATED, first by a recycling/recovery
machine and then by a vacuum pump. If there is any refrigerant in
the system, by law, it must be evacuated by a recovery or recycling
machine. Only after the system has been emptied of refrigerant and
the pressure in the system is around zero, can this air operated
pump be used to deep vacuum the system.
CONNECTING MANIFOLD:
1. Be sure that the hand valves on the manifold gauge set are in
the closed position.
(ALWAYS WEAR GLOVES AND SAFETY GOGGLES WHEN
WORKING WITH REFRIGERANT!!!)
2. Remove the protective caps from the system ports.
3. Connect the Low side service hose (Blue) to the suction side of
the compressor (see Schematic). Connect the High side service
hose (Red) to the discharge side of the compressor. Make sure
connections are secure.
PUMP CONNECTIONS AND OPERATION:
1. To connect and operate the vacuum pump, first, connect the
Service hose (Yellow) to the appropriate fitting on the front of the
pump (labeled Vacuum). When one is ready to pull a vacuum,
connect an appropriate air line to the back of the pump (labeled
Air In). For maximum performance, (the shop air compressor
should be rated at 4.5 CFM with an output of 90 psi).
2. Open both hand valves on the manifold set. The low side gauge
has a vacuum section reading in inches of Mercury. The dial
on the gauge should fall below zero and continue to fall below 20
inches. (The ultimate vacuum varies depending on altitude
and shop air pressure).
3. In order to properly evacuate your A/C system, one should run
the pump for approximately 10 minutes after the low side dial has
