Universal Enterprise AK900 Installation Manual
Digi-Cool Industries Ltd.
Digital Refrigeration System Analyzer
AK900
User manual
To take full advantage of your analyzer, please read this manual
and store in a safe place for future reference.
v1.04
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Table of Contents
Table of Contents................................................................................. 2!
Package Contents................................................................................. 3!
Features and Use.................................................................................. 4!
General ............................................................................................ 4!
Proper Use....................................................................................... 6!
External Features............................................................................. 7!
Display ............................................................................................ 8!
Keys .............................................................................................. 13!
Using the Pressure Gauges............................................................ 16!
Using Pressure Recall Modes ....................................................... 16!
Using Temperature Modes............................................................ 16!
Specifications..................................................................................... 19!
Care & Maintenance .......................................................................... 20!
General Care ................................................................................. 20!
Replacing Batteries ....................................................................... 20!
Cleaning ........................................................................................ 21!
Maintenance .................................................................................. 21!
Calibration..................................................................................... 22!
Troubleshooting ................................................................................. 23!
End-of-Life Disposal ......................................................................... 25!
Warranty ............................................................................................ 26!
Limitation of Liability........................................................................ 28!
Service and Support ........................................................................... 30!
Refrigerant Expansion................................................................... 30!
Contact Information ...................................................................... 30!
Return for Service.............................................................................. 31!
Product Regulatory Information ........................................................ 34!
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Package Contents
1 Digi-Cool AK900 Digital Refrigeration System Analyzer Unit
1 9V battery (installed)
1 Dual Temperature Sensor
1 Extended Hanging Hook
1 Two valve ball valve manifold
1 User Manual
1 Product Registration Card
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Features and Use
General
The unit performs the following tasks:
• Sense and display pressures present in the manifold
• Calculate and display dew / bubble points corresponding to the
sensed pressures, for the selected refrigerant
• Sense and display temperature of probe tip
• Calculate and display system superheat or subcooling, based on
sensed pressure and temperature, for the selected refrigerant
• Displays maximum and minimum pressures observed since
threshold reset
The unit has two 1/8" pressure ports, acting as two gauges: blue for
low side, red for high side. All settings are controlled through the
keypad and affect both sides of the display.
Some features of the unit include:
• Working pressure ranges:
Low side: 0-200psia (1350 kPa, 13.5 bar)
High side: 0-550psia (3000 kPa, 37.9 bar)
• Sensing resolution (precision):
Low side: 0.25psi or 0.4"Hg (2kPa, 0.02 bar)
High side: 1psi (7 kPa, 0.07bar)
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• Includes profiles for 45 common refrigerants
• "Dynamic Offset" bar graph display
• Pipe-mounted temperature probe for automatic superheat and
subcooling readings
• MAX and MIN pressure monitoring for control set-up
• Zero key automatically calibrates to local atmospheric conditions
• Large, easy to read LCD display
• Adjustable LCD display contrast
• Selectable reading update rates of 1 and 5 seconds, or hold current
reading
• Upgradeable to handle additional refrigerants
• Automatic shutdown after 15 minutes of inactivity
• Low battery indicator
• Tough, weather resistant case for indoor / outdoor field use
Features of the unit are patented in the US (#5,311,745) and Canada
(#2,107,134) by Digi-Cool Industries Ltd.
This unit is intended for use in an industrial or commercial
environment. Use in a residential environment may cause
interference with radio and television reception.
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Proper Use
This product is intended for use by trained service personnel only, for
use with vapor compression refrigeration, air conditioning and heat
pump systems. Servicing of refrigeration systems require special
training to ensure the safety of the service person, building occupants,
local and global environment.
Ensure your service manifold is properly rated for the operational
pressures of the analyzer, at up to 550psia (3000 kPa, 37.9 bars).
To prevent damage, never exceed the proof pressure of the analyzer:
Low side: 600psia (4100 kPa, 41 bars)
High side: 1500psia (10300 kPa, 103 bars)
For safe operation, ensure that the refrigeration system under test has
working overpressure relief equipment installed, and that they are
rated to trigger below the burst pressures of the analyzer:
Low side: 2000psia (13500 kPa, 135 bars)
High side: 5000psia (34500 kPa, 345 bars)
Refer to the instruction manual for your service manifold on its use.
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External Features
1 Display
Extended temperature LCD display, protected with clear resilient
window to prevent damage.
2 Keypad
Tactile response keypad is easy to operate, even with gloved hands.
3 Transducer Ports
1/8" NPT ports connect to the gauge ports of various service
manifolds using supplied street elbows and swivel fittings.
4 Temperature Probe Plug
Connect the temperature probe to this port. When not in use, cover
the plug with the sealing cap to maintain water resistance.
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5 Vent
Allows for atmospheric and internal pressure adjustment without
moisture entry. Do not cover this port.
6 Temperature Probe
The temperature probe can be secured onto piping from 3/8” to 3” in
outer diameter (1 to 7.5cm) with the attached hook-n-loop strap. The
connectors are water resistant when mated or when covered by their
protective caps. For accurate measurements, use a piece of pipe
insulation over the sensor and pipe to insulate them against the
ambient air.
To install the connector, align the key on the plug with the slot on the
connector. Push connector while
wiggling to mate together, and then
tighten the thread on the blue collar to
lock connector into place. When not
in use, apply the attached cover to the
connector to keep moisture and dirt
out. The probe comes with a 10’
(3m) long cord.
Display
The display of the unit is very user friendly. For users familiar with
traditional manifold gauges, the readouts should be self-explanatory.
The quantity of information offered to the user is more than any other
gauge traditionally available. A full understanding of these features
allow for rapid system analysis, for easier and more accurate troubleshooting.
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1 Low and High Side
In general, displays on the left side of the screen are associated with
the low-pressure side of the refrigeration system, represented by the
blue labeling. The right side of the display reflects the high-pressure
side, represented by the red labeling.
The low or high side display will flash when one of the following
abnormal pressure conditions occur on each side of the service
manifold:
• The pressure detected has exceeded the working pressure range of
the gauge, or
• The pressure detected far exceeds the proper operating range for
the selected refrigerant, resulting in out-of-range temperature
readings.
This may be caused by improper use of the ZERO key, or if the
working pressure range has been exceeded. Try depressurizing the
manifold and press ZERO to recalibrate to a proper atmospheric
reference. Also ensure the proper refrigerant is selected.
Bear in mind that readings are subject to device accuracy limitations.
For example, a perfect vacuum of 29.9"Hg may be displayed as
29.8"Hg or cause the device to blink due to an excessive vacuum
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reading. Given the wide operating range of the analyzer, extremely
accurate vacuum readings are intrinsically difficult to achieve.
When no pressure unit is indicated, the amounts shown are in bars.
2 Dynamic Offset Bar Graph
Each bar graph represents changes to each pressure reading since the
digits were updated. The graphs are updated four times every second.
They allow the user to monitor pressure dynamics in the system
closely.
Each segment in the low side bar graph represents ¼ psi (2 kPa, 0.02
bars) of change in the low side reading. On the high side, each
segment represents 1psi (8 kPa, 0.08 bars) of change in the high side
reading. The hash marks above the bar graph show these units for
quick reference. Segments on the left of the center mark mean
decreased pressure, while segments on the right indicate increased
pressure.
3 Pressure
The "numeric pressure" display is below the bar graph. The low side
pressure is shown in 0.1 PSI (1 kPa, 0.01 bar); the high side is shown
in PSI (kPa, 0.1 bar).
When operating in imperial gauge mode, vacuum readings below
atmosphere are shown in "Hg below atmosphere.
4 Temperature
This field displays the saturation temperatures of the selected
refrigerant at the indicated pressure. The left side reading is the vapor
saturation (dew) point for the low side pressure, while the right side
reading is the liquid saturation (bubble) point for the high side
pressure reading.
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