PREMIUM R134a 4-WAY ALUMINUM MANIFOLD GAUGE SET WITH MANUAL COUPLERS (2501041)

Product Description

Mastercool is the leading manufacturer of professional quality A/C manifold gauge sets. Our manifold gauge sets are constructed of the finest materials and machined with precision to the highest quality standards. At Mastercool, every manifold we build is built to last.
• Solid extruded aluminum body
• Stainless steel ball valve design controls flow smoothly and quickly with only a quarter turn
• Extra large sight glass for visual refrigerant check
• Large 3-1/8″ (80mm) gauges
• Silicone dampened gauges smooth out needle movement
• Gauges can easily recalibrate in the field to maintain accuracy
• 72” hoses (connections for blue and red 14 mm-M and yellow 1/2″ ACME-F with auto shut-off valve)

SERVICE NOTES;
PRE-SERVICE INSTRUCTIONS

• Do not use the gauge set on systems containing refrigerants other than those listed on the gauge face. • Close all valves on the manifold by turning them horizontal to the block.
To properly diagnose the problem in the A/C system, first check the overall system performance. Start the car and operate the A/C system on MAX. Note the interior temperature. Look for obvious indications of trouble such as a non-functioning compressor or a leaky hose or connection. Further testing includes monitoring the system’s pressure and refrigerant flow, which can be done using the manifold gauge set.

WARNING

– Be sure that the hand valves on the manifold gauge set are in the closed position. Always wear gloves and safety glasses when working with refrigerant!
1. Remove the protective caps at the high and low refrigerant ports. Make sure the ports are in fact used for the A/C system. Fuel injection ports are often mistaken for A/C ports. If unsure, consult the system flow diagram.
2. Connect the low side service hose (Blue) to the suction (Low) side of the A/C system.
3. Connect the high side service hose (Red) to the discharge (High) side of the A/C system.
4. Start the car, operate the A/C on MAX and monitor the High and Low side pressures. Depending on the pressures observed on the manifold gauge set, you must either add refrigerant or remove refrigerant and repair or replace a component.

ADDING REFRIGERANT

(High side charging) Close all manifold hand valves! Turn off the A/C system!
1. Connect the HIGH and LOW service hoses to the A/C system.
2. Connect a refrigerant supply to the black hose.
3. Open the REF hand valve and the valve of the refrigerant supply. Add a measured amount of refrigerant to the system using a calibrated heated charging cylinder or D.O.T. tank and electronic scale. 4. Close the REF hand valve and the valve on the refrigerant supply.

WARNING Wear Safety Goggles Avoid Contact with Refrigerant RECOVERING REFRIGERANT Close all manifold hand valves! MAKE SURE THE VALVE ON THE REFRIGERANT SUPPLY IS CLOSED!
1. Connect the HIGH and LOW service hoses to the A/C system.
2. Connect a recovery machine to the yellow hose from the manifold.
3. Operate the A/C system on MAX to warm the refrigerant and oil.
4. STOP the A/C system and shut off the car.
5. Open the HIGH, LOW and VAC hand valves and operate the recovery machine.
6. When the recovery machine stops and you are certain that no refrigerant remains, you can vacuum the system.

VACUUMING THE SYSTEM
Close all the manifold hand valves!
1. Connect the HIGH and LOW service hoses to the A/C system. The system pressure must be zero or less before vacuuming. If not, you must first recover any remaining refrigerant!
2. Connect the yellow hose from the manifold to the vacuum pump.
3. Open the HIGH, LOW and VAC valves on the manifold.
4. Start the vacuum pump and observe the LOW side gauge.
5. Evacuate the system for thirty minutes. Close the HIGH, LOW and VAC valves. Turn off the vacuum pump. Note the reading on the LOW side gauge. A drop in vacuum indicates a leak. Make necessary repairs and retest.