WZ-A301 - Manometers Vevor - Free user manual and instructions

Product Type	Refrigeration Manifold Gauge
Brand	Vevor
Model	WZ-A301
Low Side Measurement Range	-30 to 350 psi
High Side Measurement Range	0 to 500 psi
Compatible Refrigerants	R134A, R22, R12, R502
Product Dimensions	285 x 250 x 90 mm
Product Weight	2.1 kg (all accessories included)
Power Supply	Mechanical gauge, no battery
Main Functions	Pressure measurement, refrigerant charge, purge, zeroing
Safety Precautions	Wear goggles and gloves; do not exceed 80% of range
Maintenance	Recalibration possible: adjust needle to zero with a screwdriver
Cleaning	Wipe with a soft dry cloth
Spare Parts	Contact Vevor support for replacement parts
Technical Support	www.vevor.com/support
Certification	California Proposition 65
Intended Use	For trained refrigeration and air conditioning technicians

Frequently Asked Questions - WZ-A301 Vevor

How to adjust the gauge zero?

Unscrew the lens, hold the central screw with a screwdriver, and gently turn the needle to zero with thumb and index finger. Repeat if necessary. Not applicable for wet gauges.

Which refrigerants are compatible with the WZ-A301?

Compatible refrigerants are R134A, R22, R12, and R502.

What is the measurement range of the low side and high side gauges?

The low side measures -30 to 350 psi, the high side 0 to 500 psi.

Can I use this gauge for gases other than the listed refrigerants?

No, the device is designed only for refrigerants R134A, R22, R12, and R502. Misuse may cause leaks or injury.

How to purge air from the manifold before use?

After connecting the hoses, slightly open valve C (DSV) for a short moment to expel air and moisture, then tighten. Purge should be minimal.

What to do in case of a leak on the manifold?

Perform a pressure leak test immediately and repair any leak. Do not exceed 80% of the pressure range.

How to maintain the gauge after use?

Clean it with a soft dry cloth. Regularly check zero and recalibrate if necessary. Store in a dry place.

Where to find technical support for this product?

You can contact Vevor by email at [e-mail] or visit www.vevor.com/support.

Do I need to wear protective equipment during use?

Yes, wear safety goggles and gloves to avoid contact with refrigerants, which can cause injury.

How to install the manifold on a compressor with service valves?

Attach the hoses to the SSV and DSV valves. Open valves A and B by 1/4 to 1/2 turn, then purge. Follow the installation diagram in the manual for exact connections.

USER MANUAL WZ-A301 Vevor

Technical Support and E-Warranty Certificate www.vevor.com/support

MANIFOLD GAUGE SET OPERATING MANUAL

MODEL: WZ-A301

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VEVOR®

MANIFOLD GAUGE SET OPERATING MANUAL

Model: WZ-A301

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This is the original instruction. Please read all manual instructions carefully before operating. VEVOR reserves clear interpretation of our user manual. The appearance of the product shall be subject to the product you received. Please forgive us that we won't inform you if there are any technology or software updates on our product.

Technical parameters

Brand	Vevor
Model	WZ-A301
Measuring range:	-30~350psi (Low Side Gauge; 0~500psi (High Side Gauge)
Refrigerants	R134A/ R22/ R12/R502
Product size (mm)	285×250×90
Product weight (kg)	2.1 (Including all accessories)

Safety Precautions

Safety & Warning

Warning:

1. Do not exceed 80% of the claimed range of manifolds when using.
2. Improper operation may lead to leakage or personal injury.
3. Please read the manual and operation instructions of the manifold or equipment.
4. The refrigeration gauge has been calibrated at the factory; however, due to handling and shipping, it may be slightly out of adjustment. To adjust, unscrew and firmly hold the center screw fixed with a screwdriver, and with thumb and forefinger gripping the pointer near the center, gently turn the pointer to zero. Repeat carefully if not on zero.

IMPORTANT:

1. Gauges are available for most refrigerants in °F.
2. Please read before putting new equipment into operation. The compound rubber forms seals around the valve stem. Tighten the valve nut a quarter to half turn to take up the set before commencing, and open and retighten as necessary to keep the seal tight.

NOTE: Check equipment manufacturer's catalogue or instruction sheets for specific recommendations on refrigerant charge, oil change, and service procedures for any particular piece of equipment.

WARNING! To prevent personal injury.

Wear goggles when working with refrigerants. Contact with refrigerants may cause injury.

Wear gloves when working with refrigerants. Contact with refrigerants may cause injury.

Incorrect use or connections may cause leaks or explosions. Read and follow the instructions carefully and take precautions to avoid leaks or explosions. Confirm that all associated devices are grounded correctly before use.

CALIFORNIA PROPOSITION 65: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

This manifold is designed for use by technically trained refrigeration and air conditioning service technicians. Due to the unusually HIGH PRESSURE AND HAZARDOUS GASES IN ALL SYSTEMS, misapplication could result in injury or death. The manufacturer warns against the sale to or use of this product by anyone other than professionally trained personnel.

Product Structure Diagram

Instruction of use

Schematic of gauge manifold installation on external drive compressor with service valves. A - Manifold Suction Valve. B - Manifold Discharge Valve. C - Compressor Discharge Service Valve (DSV). D - Compressor Suction Service Valve (SSV). E - Service Opening. 1 - Purging. 2 - Charging or Adding Oil. 3 - Bypassing. 4 - Gauge Reading. 5 - Both manifold valves are turned all the way in. System is pumping vapor and both low and high-side pressures are being read.

VALVE MUST BE CLOSED

Lines from the manifold are attached to the SSV at D and should be one to two turns loose while the line to the DSV should be tightened. Open both of the manifold valves at A and B 1/4 turn to 1/2 turn at the middle opening, E.

Now turn the DSV (C) stem in 1/8 to 1/4 turn for just a moment (crack the valve). A surge of high-pressure refrigerant will then rush through the line and the manifold and purge to the atmosphere at the loose connection at D on the SSV. This connection may then be tightened. Purging is necessary to remove air and moisture from the manifold and lines. NOTE: Purging must be held to a minimum to avoid damage to the atmosphere.

Carefully test for leaks while the manifold and its lines are under high pressure. Correct any leak immediately.

Various service and testing operations may be performed after the testing manifold has been installed:

1. Observe operating pressures by:

Closing valve A by turning all the way in.

Closing valve B by turning all the way in.

Cracking open back seat of valve C.

Cracking open back seat of valve D.

1. Charge refrigerant into system by:

Connecting refrigerant cylinder to E (vapor only).

Opening valve A.

Close valve B.

Slowly close the front seat of valve D.

1. Purge the condenser by:

Close valve A.

Close valve B.

Crack open valve C.

1. Charge liquid refrigerant into the high side by:

Connect the refrigerant cylinder to E.

Close valve A.

Open valve B.

Position valve C to mid-position.

1. Build up pressure in the low side for control setting or to test for leaks.

Seal E with the seal cap.

Open valve A.

Close valve C.

PRESSURE AND COMPOUND GAUGE RECALIBRATION INSTRUCTIONS:

The refrigeration gauge has been calibrated at the factory; however, due to handling and shipping, it may be slightly out of adjustment. To adjust, unscrew the lens and firmly hold the center screw fixed with a screwdriver, and with thumb and forefinger gripping the pointer near the center, gently turn the pointer to zero. Repeat carefully if not on zero. This is not applicable to wet gauges, and wet gauges do not require zeroing.

Scope of application

For R134A/ R22/ R12/R502 Refrigerant only

Common fault analysis

fault phenomenon	failure cause	solution
Refrigeration agent leakage	The conversion joint ga is too large	Tighten the switch connector

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Technical Support and E-Warranty Certificate

www.vevor.com/support

Made In China

VEVOR®

TOUGH TOOLS, HALF PRICE

NEED HELP? CONTACT US!

User Manual

VALVE MUST BE CLOSED

www.vevor.com/support

Made in China

VEVOR®

TOUGH TOOLS, HALF PRICE

Customer service: [e-mail]

Instructions for use

VALVE MUST BE CLOSED

VALVE MUST BE CLOSED

VALVE MUST BE CLOSED

NEED HELP? CONTACT US!

VALVE MUST BE CLOSED

www.vevor.com/support

NEED HELP? CONTACT US!

Customer service: [e-mail]

Instructions for use

VALVE MUST BE CLOSED

www.vevor.com/support

Made in China

VEVOR®

TOUGH TOOLS, HALF PRICE

NEED HELP? CONTACT US!

VALVE MUST BE CLOSED

www.vevor.com/support

Made in China