User's Manual

ATD-3688

DELUXE DUAL BRASS A/C MANIFOLD

GAUGE SET

WARNING: Always wear safety goggles when working with

refrigerants. Contact with refrigerant 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 right or high side.

Diagnosing System Operation

·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.

·With the manifold handwheels closed, read the pressure on the gauge face.

·Use the temperature/pressure chart in the back of this manual to find the corresponding temperature

for the refrigerant in the system.

·Compare these pressure and temperatures to the A/C system manufacturer’s specifications for proper

operation.

·If the system is within the correct operating guidelines, disconnect the manifold hoses from the system.

PAGE 1
ATD-3688 DELUXE DUAL BRASS A/C MANIFOLD GAUGE SET WARNING: Always wear safety goggles when working with refrigerants. Contact with refrigerant 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.
PAGE 2
If repairs are necessary, follow the steps for recovering, evacuating and recharging the system. Recovering Refrigerant Note：According to federal law, refrigerant should not be exhausted to the atmosphere. ·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.
PAGE 3
system as necessary. To disconnect the manifold when the system is operating correctly, first close the high side coupler valve. Open the low side coupler valve. Then disconnect the red high side hose from the A/C system. ·Restart the A/C system, and then open both manifold handwheels. Refrigerant from both hoses will be drawn quickly into the A/C system through the blue low side hose.
PAGE 4
PAGE 5