Robinair 49134A User Manual

49134A and 48134A 2-Valve Automotive Manifold

WARNING

Evacuating and Charging a Refrigerant System

1. Connect the blue low-side hose to the A/C system’s low-

• Wear safety goggles when working

with refrigerants. Refrigerants can cause eye injury.

2. Check the manifold gauge pressure reading to verify the A/C

• Disconnect hoses using extreme

caution! Pressurized refrigerant may

be present in hoses. Point hoses away from you and anyone nearby.

3. Open the high- and low-side handwheels. Start the vacuum pump.

4. After evacuating the system according to the manufacturer’s

Instructions

The manifold is designed so all three lower ttings are connected to each other by internal passages. Separate passages from the low- and high-side ttings to their respective gauges give pressure and vacuum readings, whether the handwheels are open or closed. Handwheels and gauges are color-coded, with the blue compound gauge on the low (or left) side, and the red pressure gauge on the high (or right) side.

Connecting Field Service Couplers

Field service couplers are provided to access the vehicle's service ports.

The service coupler must be in the closed position when it is

connected to the external tting on the vehicle.

1. To close the service coupler, turn the handle counterclockwise until

nger-tight.

2. Place the service coupler on the external tting.

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 tting; then release. Verify it is correctly seated by pulling up on the service coupler.

4. For maximum ow, 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 indicated on the gauges. Compare these pressures and temperatures to the A/C system manufacturer’s specications for operation.

3. If the system is within correct operating guidelines, disconnect the manifold hoses from the system. If repairs are necessary, follow the steps for recovering, evacuating, and recharging the system.

Recovering Refrigerant

According to federal law, refrigerant must not be

exhausted to the atmosphere.

1. Verify the blue low-side hose is connected to the A/C system’s

low-side service port, and 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 correct recovery of refrigerant from the A/C system.

5. Disconnect the yellow hose from the vacuum pump, and connect it

6. Slightly open the refrigerant supply valve. Purge air from the

7. You may now charge the A/C system according to the

• If system specications call for charging on the high side, close

• If system specications call for charging on the low side, close

8. After the system is charged, close both manifold handwheels.

Maintenance

To keep the manifold in good operating condition:

Periodically replace o-rings and

•

Periodically lubricate o-rings

•

Warranty

This manifold is covered by a One-Year Limited Warranty. We guarantee the manifold to be free from defects in material and workmanship under normal use and service for one year from date of sale. See a distributor for details.

side

service port. Connect the red high-side hose to the A/C system’s high-side service port.

system has been recovered correctly. If not, follow steps under Recovering Refrigerant. If it has, connect the center yellow charging hose to a vacuum pump.

specications, close both the high- and low-side handwheels, and turn off the vacuum pump.

to the refrigerant supply tank.

yellow charging hose at the manifold. Close the supply valve.

manufacturer’s specications.

the manifold’s blue low-side handwheel, open the refrigerant supply valve, and open the manifold’s red high-side handwheel. After dispensing the correct amount of refrigerant, close the red high-side handwheel, and close the refrigerant supply valve.

the manifold’s red high-side handwheel, open the refrigerant supply valve, and open the manifold’s blue low-side handwheel. After dispensing the correct amount of refrigerant, close the blue low-side handwheel, and close the refrigerant supply valve.

Let the compressor run, and check the manifold’s gauge pressure readings to verify the system is operating correctly. If not, adjust the system as necessary. To disconnect the manifold when the system is operating correctly, close both handwheels on the manifold. Carefully remove the charging hoses from the system. Charging is now complete.

Replacement Parts List

559393 Low-side Coupler 559392 High-side Coupler

valve seats.

with Robinair No. 13067 High Vacuum Grease.

559391 Blue Hose (134a) 559390 Yellow Hose (134a) 559389 Red Hose (134a)

1-800-822-5561 in the continental U.S. and Canada. In all other locations, contact your local distributor.

☎

Because of ongoing product improvements, we reserve the right to

For more information, call TOLL-FREE

change design, specications, and materials without notice.

655 EISENHOWE R DRIVE OWATONNA MN 55060 CUSTOMER SERVICE : 1-800-533-6127 FAX : 1-800-322-2890 TECHNICAL SERVICE : 1-800-822-5561 FAX : 1-866-259-1241 WEB SITE : WWW.ROBINAIR.COM