OPERATING INSTRUCTIONS FOR
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 refrigerant 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 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, run the pump for
approximately 10 minutes after the low side dial has stopped.
4. Once lowest vacuum point has been obtained, close both high side and low
side hand valves on the manifold. Let system stand for 5 minutes or longer
and recheck reading on low side gauge.
SCHEMATIC
CONNECT AIR
LINE TO (AIR IN)
PORT. MAKE
CERTAIN AIR
PRESSURE IS
NEAR 90 PSI.
MAKE SURE TO CAP THE
PORT YOU DO NOT USE!
CONDENSER
RECEIVER/DRIER
60
60
80
80
95
100
R12
40
40
20
20
60
70
80
90
100
110
120
350
50
40
30
20
10
0
0
0
10
20
-20
-20
30
ºF
ºF
psi
Silicone
Anti-Flutter
R
1
3
4
a
R
E
T
A
R
D
I
n
H
g
V
a
c
8
5
3
5
0
250
200
300
350
400
450
500
140
120
100
80
60
40
20
160
180
195
150
100
50
0
psi
Silicone
Anti-Flutter
R12
ºF
ºF
R
1
3
4
a
140
120
100
80
60
40
160
180
200
8
5
5
0
0
HIGH
PRESSURE
SERVICE
PORT
LOW PRESSURE
SERVICE PORT
If system has lost vacuum, a leak exists. If reading is the same, no leak
exists.
**Note no moving parts, no oil required,
1.3 CFM air displacement venturi type pump.
91200-INST-UNIV
WARNING: This product can expose you to chemicals including lead and lead compounds,
which are known to the State of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.P65Warnings.ca.gov.
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