Harbor Freight Tools R134A Quick start guide

R134A
Harbor Freight Tools
Brand
Harbor Freight Tools
Model
R134A
Type
Quick start guide

Harbor Freight Tools R134A is a manifold gauge set designed for automotive air conditioning systems. It allows you to check pressures, evacuate and recharge the refrigerant, and diagnose A/C system issues. The set includes two pressure gauges, one for the low-pressure (LP) side and one for the high-pressure (HP) side of the system, as well as couplers, hoses, and manifold valves. It is compatible with R-134a refrigerant and requires a refrigerant recovery system or vacuum pump for evacuation.

Harbor Freight Tools R134A is a manifold gauge set designed for automotive air conditioning systems. It allows you to check pressures, evacuate and recharge the refrigerant, and diagnose A/C system issues. The set includes two pressure gauges, one for the low-pressure (LP) side and one for the high-pressure (HP) side of the system, as well as couplers, hoses, and manifold valves. It is compatible with R-134a refrigerant and requires a refrigerant recovery system or vacuum pump for evacuation.

LP Coupler
Valve
HP Coupler
Valve
LP
Manifold
Valve
HP
Manifold
Valve
Sight
Glass
Secondary
Charging
Port
LP Coupler
HP
Gauge
LP and
Vacuum
Gauge
HP Coupler
Charging Hose
Red HP (High-Pressure) sideBlue LP (Low-Pressure) side
WARNING
To prevent SERIOUS INJURY and DEATH:
1. READ ENTIRE MANUAL BEFORE USE.
2. Use in well-ventilated area only.
3. Wear ANSI-approved safety goggles and
heavy-duty work gloves during setup and use.
4. DO NOT OPEN either Manifold Valve unless
directed to do so; otherwise, refrigerant leaks,
A/C contamination, and hazardous expulsion
of pressurized refrigerant may occur.
5. Keep gauge and hoses away
from moving engine parts.
6. Turn off vehicle’s engine and A/C system
before attaching gauge.
7. Technicians performing this procedure or
opening refrigeration circuit in automotive
air conditioning systems MUST be certied
in refrigerant recovery and recycling
procedures in compliance with section 609
of Clean Air Act Amendments of 1990.
QUICK
REFERENCE
GUIDE
A/C MANIFOLD
GAUGE SET
ITEM 92649
Manifold Valve
operation:
CW
= close
CCW
= open
(clockwise)
(counterclockwise)
Coupler Valve
operation:
CCW
= close
CW
= open
(clockwise)
(counter-
clockwise)
KEEP
CLOSED
CW
Diagnostic Check
1
CLOSE ALL VALVES:
Manifold Valves - turn CW.
Coupler Valves - turn CCW.
3
Attach Couplers to
A/C system,
Blue to
suction LP port,
and Red to
discharge HP port.
4
To do a dynamic check, turn on engine,
allow to warm up, then turn on A/C.
Open Coupler Valves - turn CW.
Compare Gauge readings to vehicle’s
service specications.
5
Close Coupler Valves by
turning CCW.
Shut off engine and A/C
system if dynamic check
was done.
CAREFULLY
disconnect Couplers
from A/C system;
hoses may contain
residual refrigerant.
2
2
2
KEEP
CLOSED
CW
11
CW
4
CW
4
To suction
LP port
3
To discharge
HP port
3
CCW
1
CCW
1
2
Connect Red, Blue and Yellow Hoses
to Manifold and Couplers as shown,
RED – RED and BLUE – BLUE.
WARNING
A/C service can be dangerous.
To prevent SERIOUS INJURY,
read entire manual before use.
Recovery / Evacuation
CONNECT HOSES:
ATTACH COUPLERS:
CHECK:
AFTER:
2
To suction
LP port
3
To discharge
HP port
3
CCW
4
CCW
4
3
Attach Couplers to
A/C system,
Blue to
suction LP port
and Red to
discharge HP port.
4
Turn on recovery system / vacuum pump.
Open Coupler Valves - turn CW.
Open Manifold Valves - turn CCW.
Read amount of vacuum on Blue LP Gauge.
5
Shut off recovery
system / vacuum
pump when vacuum
reaches manufacturer’s
recommendation.
Close Coupler Valves by
turning CCW.
Disconnect Couplers from
A/C system.
CW
4
CW
1
CW
4
CW
1
CCW
1
CCW
1
To refrigerant
recovery system
/ vacuum pump
2
Connect Red and Blue Hoses to Manifold
and Couplers as shown,
RED – RED and BLUE – BLUE.
Connect Yellow Hose to
refrigerant recovery system / vacuum pump.
2
2
Recovery / Evacuation
WARNING
A/C service can be dangerous.
To prevent SERIOUS INJURY,
read entire manual before use.
CONNECT HOSES:
ATTACH COUPLERS:
RECOVERY / EVACUATION:
AFTER:
1
CLOSE ALL VALVES:
Manifold Valves - turn CW.
Coupler Valves - turn CCW.
2
CCW
4
2
Connect Red and Blue Hoses to Manifold
and Couplers as shown,
RED – RED and BLUE – BLUE.
Connect Yellow Hose to R-134a supply.
KEEP R-134A CAN/CYLINDER UPRIGHT.
Charging
3
Attach Couplers to
A/C system,
Blue to
suction LP port
and Red to
discharge HP port.
4
Turn on engine, allow to warm up,
then turn on A/C.
Open Coupler Valves - turn CW.
Only open BLUE Manifold Valve - turn CCW.
5
After charging
manufacturer
recommended amount
of R-134a, close Coupler
Valves by turning CCW.
Shut off engine and
A/C system.
CAREFULLY
disconnect R-134a
supply and Couplers
from A/C system;
hoses may contain
residual refrigerant.
CW
4
CW
1
CW
4
CCW
1
CCW
1
To R-134a
supply
KEEP
CLOSED
CW
1
To suction
LP port
3
To discharge
HP port
3
2
2
WARNING
A/C service can be dangerous.
To prevent SERIOUS INJURY,
read entire manual before use.
CONNECT HOSES:
ATTACH COUPLERS:
CHARGING:
AFTER:
1
CLOSE ALL VALVES:
Manifold Valves - turn CW.
Coupler Valves - turn CCW.
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Harbor Freight Tools R134A Quick start guide

R134A
Harbor Freight Tools
Brand
Harbor Freight Tools
Model
R134A
Type
Quick start guide

Harbor Freight Tools R134A is a manifold gauge set designed for automotive air conditioning systems. It allows you to check pressures, evacuate and recharge the refrigerant, and diagnose A/C system issues. The set includes two pressure gauges, one for the low-pressure (LP) side and one for the high-pressure (HP) side of the system, as well as couplers, hoses, and manifold valves. It is compatible with R-134a refrigerant and requires a refrigerant recovery system or vacuum pump for evacuation.

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