Robinair 40134A MANIFOLD - Manual

Recovering Refrigerant
Note: According to federal law, refrigerant should not be
exhausted to the atmosphere.
1. Be sure the blue low side hose is connected to the A/C
system’s low side service port and that the red high side
hose is connected to the A/C system’s high side service
port.
Note: Typically, the yellow center hose is connected to the
inlet of the recovery unit.
2. Follow the instructions provided with the recovery unit
for proper recovery of refrigerant from the A/C system.
Evacuating and Charging a Refrigerant System
1. 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.
2. Check the manifold gauge pressure reading to be sure
the A/C system has been recovered properly. If it is not,
follow steps under “Recovering Refrigerant.” If it is,
connect the center yellow charging hose to a vacuum
pump.
3. Open the high and low side handwheels and start the
vacuum pump.
4. After evacuating the system according to the manu-
facturer’s specifications, close both the high and low
side handwheels and turn off the vacuum pump.
5. Disconnect the yellow hose from the vacuum pump and
connect it to the refrigerant supply.
6. Slightly open the refrigerant supply valve. Purge air
from the yellow charging hose at the manifold, then
close the supply valve.
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 handwheel, open
the refrigerant supply valve and open the manifold’s red
high side handwheel. After dispensing the proper
amount of refrigerant, close the manifold’s red high side
handwheel and close the refrigerant supply valve.
• If the system specifications call for charging on the low
side, close the manifold’s red high side handwheel, open
the refrigerant supply valve and open the manifold’s
blue low side handwheel. After dispensing the proper
amount of refrigerant, close the manifold’s blue low side
handwheel and close the refrigerant supply valve.
40134A, 40152, 40153, 41600, 41700 S
ERIES
M
ANIFOLD
O
PERATING
I
NSTRUCTIONS
WARNING
Always wear safety goggles when work-
ing with refrigerants. Contact with refrig-
erant can cause eye injury.
Disconnect hoses with extreme caution!
Pressurized refrigerant may be present in
hoses. Always point hoses away from you
and anyone nearby.
Your manifold is designed so that all three lower fittings are
connected to each other by internal passages. Separate passages
from the low and high side fittings to their respective gauges
give you pressure and vacuum readings whether the handwheels
are open or closed. For your convenience and safety, handwheels
and gauges are color-coded with the blue compound gauge on
the left or low side, and the red pressure gauge on the high or
right side.
Connecting Field Service Couplers (40134A)
Field service couplers are provided to access the vehicle’s
service ports. The service coupler should be in the closed
position before connecting to the external fitting on the vehicle.
1. To close, turn the handle counterclockwise until finger
tight.
2. Place the service coupler on the external fitting.
3. Push in on the handle of the service coupler with your
thumb, while pulling up on the sleeve, until it bottoms on
the external fitting; then release. Check to see if it is
correctly seated by pulling up on the service coupler.
4. For maximum flow, turn the handle clockwise until it
stops.
Diagnosing System Operation
1. 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.
2. With the manifold handwheels closed, read the pressures
on the gauge face.
3. Use the temperature/pressure chart stored on the back of
the gauge holster to find the corresponding temperature
for the refrigerant in the system (41600, 41700).
4. Compare these pressures and temperatures to the A/C
system manufacturer’s specifications for proper opera-
tion.
5. If the system is within the correct operating guidelines,
disconnect the manifold hoses from the system. If
repairs are necessary, follow the steps for recovering,
evacuating, and recharging the system.
(continued)