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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
1
2 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)
65˚
95˚
100˚
105˚
70˚
75˚
80˚
85˚
90˚
Low Side Gauge (PSI)
R134a
25-35
30-40
35-45
40-45
45-55
45-55
R1234yf
22-32
27-38
33-43
40-45
46-56
46-56
High Side Gauge (PSI)
R134a R1234yf
135-155 128-142
145-160
150-170
175-210
225-250
250-270
50-55
50-55
53-57
53-57
275-300
315-325
50-55 53-57 340-345
* This chart should be used as a reference only please contact the vehicle manufacturer for exact information
140-155
148-166
175-210
227-253
255-275
280-310
325-342
350-360
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
A
BRASS MANIFOLD
E
F, G
60 70
50 80
40
60
60
90
80
80
30
40
40
100
20
10
20
0
0
-20
Silicone
Anti-Flutter
0
10
-20
In Hg Vac
20 30 psi
R1
23
4y
ºF
R E
R1
34
T A a
R
D
350
120
110
BB
H
AA
CC
DD
B C D
Q, R
EE
FF
P
N
O
M K, L
ALUMINUM MANIFOLD
J
U, V
S, T
I
II
S, T
GG HH
BRASS & ALUMINUM GAUGE SET PARTS
Fig. Description
A. Piston Seal Assembly with O-Rings (2 pcs)
Fig. Description
Q. R1234yf High Side Manual Coupler Complete
B. Piston Seal O-Ring (2 pcs)
C. Stem and Nut
D. Hand-wheel
R. R1234yf Low Side Manual Coupler Complete
S. High Side O-Ring
T. Low Side O-Ring
U. R34a High Side Manual Coupler Complete E. Complete Stem Assembly with Knob (2 pcs)
F.
G.
R1234yf/R134a High Side Gauge (Red)
Complete
R1234yf/R134a Low Side Gauge (Blue)
Complete
V. R134a Low Side Manual Coupler Complete
AA. Shut-Off Valve O-Ring
H. O-ring for Male Hose Fitting
I. Gasket for Hose Assembly
J. Complete Stem Assembly w/Knob (2 pcs)
K. Knob Only, Low Side, (Blue)
L. Knob Only, High Side (Red)
BB. Lens
CC. R1234yf High Side Quick Coupler Complete
DD. R1234yf Low Side Quick Coupler Complete
EE. R134a High Side Quick Coupler Complete
M. Stem, Nut and Stem O-Ring
N. Stem O-Ring (2 pcs)
O. Piston Seal O-Rings (4 pcs)
P. Piston Seal Assembly with O-Rings (2 pcs)
FF. R134a Low Side Quick Coupler Complete
GG.
1/2” ACME-M x 1/2” ACME-F LH Thread Vacuum
Pump/Tank Adapter
HH.
O-Ring for 1/2” ACME-M x 1/2” ACME-F LH
Thread Adapter
II. 12 mm-m x 14 mm-f R1234yf Adapter
3
4
For parts or service, contact the service department 1-888-825-6989
66661-AYF-INST

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