Product Overview; Operation - U.S. General 92649 Assembly And Operating Instructions Manual

1. The A/C Manifold Gauge Set is designed to test automotive air conditioning systems.
By comparing the high side and low side pressure reading to the vehicle manufacturer's
A/C system specifications, a probable faulty condition may be determined.
2. The High Pressure Gauge (3) is used to measure compressor discharge pressure.
The Low Pressure Gauge (5) is used to measure suction, or low side pressure. (See
FIGURE 1 on page 6.)
3. The Red and Blue Thumb Handles (11) control the flow of refrigerant to and from the
Yellow Refrigeration Charging Hose (18), also called the Service Hose.
of these Thumb Handles will not be explained in this manual.
4. The valves on the Red High Pressure Coupler (22) and Blue Low Pressure Coupler (23)
control the input to the High Pressure Gauge (3) and Low Pressure Gauge (5) from the
Red High Pressure Hose (17) and Blue Low Pressure Hose (19). (See FIGURE 1.)
5. The Yellow Refrigeration Charging Hose (18), also called Service Hose, is connected
to a vacuum pump for purging the system (cleaning or evacuating). The Yellow Refrig-
eration Charging Hose (18) also is connected to a container of R-134A Refrigerant for
charging (filling) the system. For testing, the Yellow Hose (18) not used and is attached
to both branches of the T-fitting (16) on the Manifold Body (2) (see FIGURE 1).
6. General instructions for testing an A/C system are outlined in this manual. Specific
procedures for each individual system type and model should be referenced in the
vehicle manufacturer's specific A/C system service manual.
7. Although this kit may have some utility in these procedures, instruction is NOT provided
for the evacuation and recovery of the system. All technicians opening the refrigeration
circuit in automotive air conditioning systems MUST be certified in refrigerant recovery
and recycling procedures - see box on front cover.
Refer to the Assembly Drawing on page 8.
To Conduct a Static A/C Pressure Reading:
Make sure the vehicle's engine is NOT running, and the A/C system is OFF.
1.
2. Turn the Red Thumb Handle (11) and Blue Thumb Handle (11) clockwise, to the CLOSED
position. See FIGURE 1 on page 6.
WARNING: DO NOT, AT ANY TIME, OPEN the Thumb Handles (11) or refrigerant will be
leaked to the atmosphere and the A/C system may become contaminated.
3. Note: Before connecting the Red High Pressure Coupler (22) and the Blue Low Pres-
sure Coupler (23) make sure the Control Valves are closed. To close, turn each control
valve counterclockwise.
4. Connect the Red High Pressure Coupler (22) to the A/C system high side line.
See FIGURE 1 on page 6.
5. Connect the Blue Low Pressure Coupler (23) to the A/C system low side line.
See FIGURE 1 on page 6.
6. Connect both ends of the Yellow Refrigeration Charging Hose (18) to both branches of
the T-fitting (16) on the Manifold Body (2). See FIGURE 1 on page 6.
7. Turn the Control Valves of the Red High Pressure Coupler (22) and Blue Low Pressure
SKU 92649 For technical questions, please call 1-800-444-3353

PRODUCT OVERVIEW

Operation

The actual use
(See FIGURE 1.)
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