UEi AK940 Instruction Manual

AK940

Digital Refrigerant System Analyzer

99 Washington Street

INSTRUCTION MANUAL

ENGLISH

Digital Refrigerant Analyzer

AK940

MAXMIN

Psi
kPa
Bar

LOW START PRS HIGH END PRS

VAPOR SAT

T-LOW

SUPERHEAT

MPa

°C
°F

MIN

PRS

LIQUID SAT

T-HIGH

SUBCOOL

MAX

TEST

R

°C
°F

TIME

P
T

UNITS

REFZERO

VAC REF

Visit us at www.TestEquipmentDepot.com

°C
°F

Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

TABLE OF CONTENTS

FEATURES .......................................................................................................... 4

GENERAL SPECIFICATIONS
QUICK START INSTRUCTIONS
IMPORTANT SAFETY WARNINGS
SYMBOLS
OVERVIEW
OPERATING INSTRUCTIONS

DISPOSAL

CLEANING

STORAGE

WARRANTY

.......................................................................................................... 8

................................................................................................8 - 11

Min/Max Button ...........................................................................11 - 12

Zero Pressure Button ........................................................................... 12

Refrigerant Selection Button .............................................................. 13

Unit Selection Button ........................................................................... 14

Pressure Test/∆P (Delta Pressure) Button ........................................... 15

Superheat and Subcool ....................................................................... 16

Vapor/Liquid Saturation Temperatures .............................................. 17

T-Low and T-High/∆T (Delta Temperature) ..................................17 - 18

Recovering Refrigerant; Evacuating a System;

Adding Refrigerant to a System ......................................................... 18

Connecting AK940 ............................................................................... 19

Battery Replacement ........................................................................... 19

........................................................................................................ 20

....................................................................................................... 20

........................................................................................................ 20

.................................................................................................... 20

.......................................................................... 4

....................................................................... 5

.........................................................6 - 7

...................................................................... 11

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FEATURES

• Low and High Side Pressure

• Vapor and Liquid Saturation

• High and Low Side Temperatures

• Superheat

• Subcool

• Pressure Differential

• Tempearture Differential

• Digital Manifold w/ 4 valves

• Max/Min

• 12 Parameter Backlit display

• Reads in Psi, kPa, Bar, Mpa

• Bargraph (Relative)

• Zero to recalibrate

• 64 Refrigerant options

• Selectable ˚F or ˚C

• Over molded grip

• Thermistor temperature ports

GENERAL SPECIFICATIONS

• Operating Temperature: -4˚ to 122˚F (-20˚ to 50˚C)

• Storage Temperature -4˚ to 122˚F (-20˚ to 50˚C)

• Dimensions: 7 3/4” X 7 1/2” X 3 1/2”

• Item Weight: 2.97 lbs

• Calibration: Recommended annually

• Battery Type: 9V X 1

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QUICK START INSTRUCTIONS

• Install 1 (9V) battery into back of analyzer.

• Press Power (Green) button to turn on analyzer.

• Display: 12 Parameter screen:

1. Low Side Pressure value.

2. High Side Pressure value.

3. Vapor Saturation temperature.

4. Liquid Saturation temperature.

5. T-Low.

6. T-High.

Display will not show temperatures if sensors are NOT connected to the Temperature
Clamp Sensor ports.

7. Superheat.

8. Subcool.

9. Refrigerant selected.

10. Time: (HH:MM) Test Duration.

11. ∆P (Delta pressure).

12. ∆T (Delta temperature).

• Unit of Measurement.

• Low Side Relative Pressure Bargraph: Each segment is 0.25 Psi.

• High Side Relative Pressure Bargraph: Each segment is 1.0 Psi.

• The Relative Bargraph shows real time changes in pressure. The center bar is
stable. If the pressure is increasing, the bars will go to right. If the pressure is
decreasing, the bars will go to the left.

• Review and follow all Important Safety Warnings (see page 6).

• Connect the AK940 to the system to be tested.

• You are now ready to test.

NOTE: See diagram (page 19) – Connecting AK940 in Operating Instructions.

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IMPORTANT SAFETY WARNINGS

WARNING

Read entire Safety Notes section regarding potential hazard and proper instructions before
using this meter. In this manual the word “WARNING” is used to indicate conditions or
actions that may pose physical hazards to the user. The word “CAUTION” is used to indicate
conditions or actions that may damage this instrument.

WARNING

• WARNING: DO NOT exceed Maximum Pressure Range: 725 psi
This analyzer’s specified maximum pressure range.

• WARNING: Proof Pressure: 1000 psi
This is the pressure limit applied to the sensors without causing permanent damage.
Damage resulting from exceeding proof pressure level will void warranty and may cause
personal injury.

• WARNING: Burst Pressure: 1500 psi
This is the maximum overload pressure at which the analyzer sustains permanent
damage, seal leakage or fails entirely. Damage resulting from exceeding burst pressure
level will void warranty and may cause personal injury.

• Do not use the analyzer if it operates abnormally. Protection may be impaired.

• Do not operate this analyzer or service batteries around explosive gas, vapor or dust.

• Various refrigerants have been intentionally excluded for very significant reasons.
Never use refrigerants in this analyzer that are not listed in the Refrigerant Selection
menu or Operating Instructions.

• The refrigerant database in this analyzer may include refrigerants classified as
flammable. If such refrigerants are selected, the operator may need additional
certifications and/or training. Consult with your local and state governments and fully
comply with all requirements.

• Always inspect the sample hoses before each use. Replace the hoses if they appear
cracked, frayed, obstructed or fouled with oil.

• Always wear eye and skin protection when working with refrigerants. Escaping
refrigerants will present a freezing danger. Do not direct refrigerants vapors venting
towards the skin.

• Do not breathe refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose
and throat. If accidental system discharge occurs, immediately ventilate work area.

• Because this analyzer allows for various inputs including electrical and mechanical,
care must be taken to observe any ways that a shock hazard could develop. Wet or
humid conditions, along with damaged temperature sensor clamp could allow an

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electrical path across the analyzer and over wet hoses. Keep all interconnected
equipment clean, organized and in proper condition. Do not use the analyzer if you are not
qualified to recognize potential electrical faults.

CAUTION: To avoid damage to the analyzer, follow these guidelines:

• Do not allow pressures beyond what specifications are listed in this manual.

• Be aware that internal pressures can change unintentionally when equipment is

stored with pressure in the system during temperature changes. If subcooled liquid
refrigerant is trapped in a hose or manifold with no room for expansion, it may
result in dramatic pressure variations with seemingly small temperature changes.
Pressures can reach high enough levels to cause damage to the instrument’s
pressure sensors. Release liquid refrigerant from the hoses and manifold when
disconnecting from a system.

• Do not attempt to introduce liquid or samples heavily laden with oil into the analyzer.

• Do not use this analyzer on systems containing leak sealing chemicals.

These leak sealants can collect and harden in the analyzer, causing permanent
damage.

• Do not utilize any hose other than those supplied with the analyzer (or supplied by

UEi). The use of other hose types will introduce errors into the refrigerant analysis
and instrument calibration.

• Never obstruct the air intake, sample exhaust or case vent ports of the analyzer

during use.

WARNING

• The analyzer contains no internal user-serviceable parts other than batteries that

may be accessed through the battery cover. Do not open the analyzer other than
opening the battery cover.

WARNING

• To ensure safe operation and service of the analyzer, follow these instructions.

Failure to observe these warnings can result in severe injury or death.

• NOTE: It is unlawful to discharge or exhaust refrigerants into the atmosphere. It is

recommended to recycle or recover refrigerants. Check with your local government
agencies for refrigerant handling regulations.

WARNING

• This analyzer is designed for trained trade professionals who are familiar with the

hazards of their trade. Observe all recommended safety procedures and use of
personal protective equipment. For vapor compression refrigeration, air
conditioning and heat pump systems; servicing of refrigeration systems requires
special training to ensure the safety of the service person, building, occupants, local
and global environments.

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