Mastercool R134a Brass 2-way Manifold - Manual (Page 2)

The 1990 amendments to the United States Clean Air
Act mandate that all personnel who service refrigerant
systems must be trained and certified. Fines are in place
for violations and compliance is not being monitered by
the U.S. EPA.
PRE-SERVICE INSTRUCTIONS
1. Close both valves on the manifold gauge set by turning the High
and Low knobs clockwise.
2. The gauges are correctly calibrated at the factory before
shipment. If calibration is required, insert a straight blade
screwdriver into the adjusting screw on the gauge face.
3. Attach the High and Low couplers to the male end of the Red and
Blue hoses. If using manual couplers, open the plunger by turning
the knob counter-clockwise prior to connection to the system. If
E-Z Snap
TM couplers are used, pull the sleeves up to unlock
position before attaching to an A/C system (figs. A & B).
4. Connect the Red hose to the High port and the Blue hose to the
Low port on the manifold gauge.
TESTING AND CHARGING
To properly diagnose the problem in the A/C system, first check the
system’s overall performance. This includes testing the system’s
pressure and refrigerant flow. These conditions can be checked with
the manifold gauge set.
NOTE: Be sure that the hand valves on the manifold gauge
set are in the closed position. Always wear gloves and safety
goggles when working with refrigerant.
1. Remove the protective caps from the system ports. Check for
leaks at the ports.
2. Connect the Low Side service hose (Blue) to the suction side of
the compressor. Connect the High side service hose (Red) to
the discharge side of the compressor. Make sure the couplers are
securely snapped (fig. D).
3. If using manual couplers, move the plunger down within the
coupler by turning the knob clockwise in order to open the port
valves and start refrigerant flow.
IMPORTANT NOTES
• A system that has been opened or one that is found to be
excessively low on refrigerant pressure as a result of a leak, must
be fully evacuated by means of recycling and deep vacuum.
(fig. C)
• A system that has been evacuated must be repaired, leak tested
and evacuated again to 29” Hg. before charging.
• If charging on the liquid or High Side, use only the High Side valve
on the manifold gauge set. Make sure the Low Side valve is
closed.
• After charging, test the system by turning on the engine and
running the A/C with both valves closed on the manifold.
WARNING
Wear Safety Goggles
Avoid Contact with Refrigerant
E-Z SNAP TM COUPLER (Fig. A) MANUAL COUPLER (Fig. B)
PULL
SLEEVE
to
UNLOCK
SERVICE
PORT
UNLOCKED
POSITION
LOCKED
POSITION
SLEEVE
To attach to the system, make sure that the coupler is in it’s unlocked
position. Press the coupler against the service port until it snaps
(locked position). To attach to the system, backdown the plunger by turning the knob
fully counter-clockwise. Connect to the system by lifting up the sleeve,
placing the service port inside the coupler and releasing to lock. To
start the flow, turn the knob fully clockwise (opening the service port).
EVACUATION OF REFRIGERANT AND
DEEP VACUUM (Fig. C)
CHARGING (Fig. D)
TO HIGH SIDE
"DISCHARGE"
TO
RECOVERY/RECYCLING
MACHINE OR
VACUUM PUMP
TO LOW
SIDE
"SUCTION"
TO LOW
SIDE
"SUCTION"
TO HIGH SIDE
"DISCHARGE"
TO FRESH
REFRIGERANT
SUPPLY TANK
OR
CHARGING CYLINDER
• After testing, disconnect the couplers from the system and make sure to use a recovery/recycling machine to evacuate any refrigerant remaining
in the hoses.
WARNING
• WEAR GOGGLES!!
• DO NOT VENT REFRIGERANT INTO ATMOSPHERE