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Old 04-13-2011, 07:58 PM   #1
Doz
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Here's a nice Tool of the future

http://www.testousa.com/557/





The new testo 557 Refrigeration System Analyzer technical data
Pressure kPa / MPa / bar / psi
Temperature °C / °F / K
Vacuum hPa / mbar/ Torr / inH2O / Micron /
inHg / Pa
SENSORS:
Pressure 2 x pressure sensors
Temperature 2 x NTC
Interfaces 3 x 7/16" UNF, 1x 5/8" UNF, NTC measurement
MEASURING RANGES:
Pressure HP/LP(rel): -14.7 to 725 psi / -100 to 5000 kPa
-0.1 to 5 Mpa / -1 to 50 bar
Temperature: -58 to 302°F / -50 to +150°C
Vacuum (rel) -1 to 0 bar
Overload pressure 52 bar, 5200 kPa, 5.2 Mpa, 754 psi
RESOLUTION:
Pressure 0.01 bar / 0.1 psi / 1 kPa / 0.001 Mpa
Temperature 0.1°C / 0.1°F
Vacuum 1 hPa / 1 mbar / 0.5 Torr / 0.5 inH2O / 0.02 inHg / 500 Micron / 100 Pa
ACCURACY (@ 22°C/71.6°F):
Pressure ±0.5% fs (±1 digit)
Temperature ±0.5 °C (±1 digit)
Vacuum ±1% fs (±1 digit)
No. of refrigerants 40
Selectable refrigerants no refrigerant, R12, R22, R123, R134a, R227, R290, R401A, R401B, R402A, R402B, R404A, R406A, R407A, R407C, R408A, R409A, R410A, R411A, R413A, R414B, R416A, R417A, R420A, R421A, R421B, R422A, R422B, R422D, R424A, R427A, R434A, R437A, R438A, R502, R503, R507, R600, R600a, R718, R744 (only up to 50bar / 725psi), R1234yf (display: T8)

Measurable media Measurable media: All media that are stored in the testo 557.
Not measurable: Ammonia (R717) and other refrigerants which contain ammonia
AMBIENT CONDITIONS:
Operating temperature -20 to 50°C / 14 to 122°F
Storage temperature -20 to 60°C / -4 to 140°F
Humidity application range 10 to 90 %RH
HOUSING:
Material ABS / PA / TPE
Dimensions approx. 11.02 x 5.3 x 3.0 in
Weight approx. 3 lbs (without batteries)
IP-class 42 (hanging)
POWER SUPPLY:
Current source Rechargeable batteries / batteries
4x 1.5 V, type AA / mignon / LR6
Battery life approx. 150 h (no display ilumination)
DISPLAY:
Type illuminated display
Response time 0.5 s
Directives, standards and tests: EC Directive: 2004 / 108 / EC
Warranty Duration: 2 years warranty conditions:
see website www.testo.com/warranty


The new testo 557 Refrigeration System Analyzer is designed to save you
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Old 04-15-2011, 08:20 PM   #2
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Here is a good site for HVAC Techs called HVAC Talk

http://hvac-talk.com/vbb/
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Old 05-13-2011, 09:07 PM   #3
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Nice info
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Old 05-14-2011, 06:55 AM   #4
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Good to have you here and enjoy the site.
I have you all set
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Old 09-02-2011, 02:11 PM   #5
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Extech Introduces HDV600 High-Definition VideoScope Series

Designed for use in practically any environment, Extech's durable HDV600 high-definition borescope camera series features a 5.7" (145mm) color display for bright outdoor sites or poorly lit facilities. Optics include 4mm-6mm LED-illuminated camera probes and SD memory stores 15,000 JPEGs or video -- plus audio annotations. Glove-friendly controller handsets with 320˚ articulated probes and wireless connectivity (10m range) simplify inspections. HDV600 videoscopes are designed for ruggedness, upgradeable versatility, and high-definition clarity.





More info on site and has a video to see how it works.

http://www.prweb.com/releases/extech...web8762112.htm
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Old 10-18-2011, 05:23 PM   #7
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Nice Techman


VFD-101 for the HVAC Market



This collection of lessons covers some of the basic information needed to understand the installation and operation of Variable Frequency Drives for the HVAC market in fan applications.

In front of each lesson there is a series of short questions. If you can answer most of these questions correctly, then skip this lesson and go to the next. At the end of each lesson there is an evaluation test insuring that you have properly assimilated the information.

http://www.danfoss.com/North_America...VAC+Market.htm
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Old 10-18-2011, 05:42 PM   #8
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R-22 Enthapy chart

http://hvacsuite.com/R-22_Enthalpy_chart.pdf
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Old 10-20-2011, 08:51 PM   #9
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Siemens TEC 540-100 PDF

http://www.delvingware.com/webservic...heets/PTS4.pdf
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Old 11-06-2011, 10:56 AM   #10
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For Those wanting to learn DDC

Here's a site to help

http://www.ddc-online.org/default.html
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