Master cool R134a Manual de usuario

R134a/R1234yf MANIFOLD GAUGE SET

OPERATING INSTRUCTIONS

WARNING

• WEAR GOGGLES!!

• AVOID CONTACT WITH REFRIGERANT

• DO NOT VENT REFRIGERANT INTO

ATMOSPHERE

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 quick couplers

are used, pull the sleeves up to unlock

position before attaching to an A/C system.

NOTE: Attach 12 mm-m x 14 mm-f R1234yf

adapters (ﬁg. II) to R1234yf couplers (ﬁg. Q,R

or CC, DD) before connecting to the red and

blue hose.

4. Connect the red hose to the high side port and the blue hose to the low side port on the manifold gauge.

TROUBLESHOOTING TIPS

• Low side and high side pressure are low. Usually indicates a low charge.

• Low side pressure is low and high side pressure is high. Usually indicates a blockage in the system.(i.e.

expansion of valve or oriﬁce tube.)

• Low side pressure is high and high side pressure is low. When accompanied by a vibrating gauge

needle, usually indicates faulty reed valves in compressor.

• Low side and high side pressures are high. Usually indicates an over charged system.

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.

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.

• 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.

• 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.

TEMPERATURE PRESSURE CHART

Ambient

Temperature (˚F)

Low Side Gauge (PSI) High Side Gauge (PSI)

R134a R1234yf R134a R1234yf

65˚ 25-35 22-32 135-155 128-142

70˚ 30-40 27-38 145-160 140-155

75˚ 35-45 33-43 150-170 148-166

80˚ 40-45 40-45 175-210 175-210

85˚ 45-55 46-56 225-250 227-253

90˚ 45-55 46-56 250-270 255-275

95˚ 50-55 53-57 275-300 280-310

100˚ 50-55 53-57 315-325 325-342

105˚ 50-55 53-57 340-345 350-360

* This chart should be used as a reference only please contact the

vehicle manufacturer for exact information

WARNING: This product can expose you to chemicals including Di (2-ethylhexyl) phthalate, lead and

lead compounds, which are known to the State of California to cause cancer and birth defects or other

reproductive harm. For more information go to www.P65Warnings.ca.gov

BRASS & ALUMINUM GAUGE SET PARTS

Fig. Description Fig. Description

A. Piston Seal Assembly with O-Rings (2 pcs) Q. R1234yf High Side Manual Coupler Complete

B. Piston Seal O-Ring (2 pcs) R. R1234yf Low Side Manual Coupler Complete

C. Stem and Nut S. High Side O-Ring

D. Hand-wheel T. Low Side O-Ring

E. Complete Stem Assembly with Knob (2 pcs) U. R34a High Side Manual Coupler Complete

F. R1234yf/R134a High Side Gauge (Red)

Complete V. R134a Low Side Manual Coupler Complete

G. R1234yf/R134a Low Side Gauge (Blue)

Complete AA. Shut-Off Valve O-Ring

H. O-ring for Male Hose Fitting BB. Lens

I. Gasket for Hose Assembly CC. R1234yf High Side Quick Coupler Complete

J. Complete Stem Assembly w/Knob (2 pcs) DD. R1234yf Low Side Quick Coupler Complete

K. Knob Only, Low Side, (Blue) EE. R134a High Side Quick Coupler Complete

L. Knob Only, High Side (Red) FF. R134a Low Side Quick Coupler Complete

M. Stem, Nut and Stem O-Ring GG. 1/2” ACME-M x 1/2” ACME-F LH Thread Vacuum

Pump/Tank Adapter

N. Stem O-Ring (2 pcs) HH. O-Ring for 1/2” ACME-M x 1/2” ACME-F LH

Thread Adapter

O. Piston Seal O-Rings (4 pcs) II. 12 mm-m x 14 mm-f R1234yf Adapter

P. Piston Seal Assembly with O-Rings (2 pcs)

BCD

OMK, L

F, G

S, T

U, V

S, T

Q, R

BRASS MANIFOLD

ALUMINUM MANIFOLD

psi

100

110

120

350

ºF

-20

Silicone

Anti-Flutter

For parts or service, contact the service department 1-888-825-6989

66661-AYF-INST

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