Category Archives: Refrigeration Products

Testo 523, 556, 560 and related products

The Service Assistant by Field Diagnostic Systems Inc.

Introducing one of the most advanced tools EVER to hit the HVACR market:

fielddiagnosticshvacserviceasstThe Service Assistant by Field Diagnostic Systems Inc.

The true power of the Service Assistant by Field Diagnostic Services is readily apparent when you review the reports that are possible.

Commercial Green Report

Executive Report Commercial (2)

Residential Exec Summary

Service Assistant Brochure

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Filed under A/C and Heat Pump Products, Airflow, HVAC, New Product Release, Refrigeration Products

What’s HOT in the TOOL world! – Bill Spohn to speak at ACCA Western-PA meeting – Oct. 4

Bill Spohn from TruTech Tools will be demonstrating what’s new in the world of HVACR tools and test instruments.

Also presenting will be representatives from Ritchie/Yellow Jacket, Hilti Tools, and United Rentals.
And meet the “Student of the Month” from Triangle Tech!

Mark your calendar and be sure to join us!

Peter’s Place
1199 Washington Pike, Bridgeville, PA 15017
(Exit 55 off I79N or I79S)

3:00 pm – Board Meeting
5:30 – 6:00 pm – Social Hour (cash bar)
6:00 pm – 7:00 pm – Guest Speakers
7:00 pm – Social Hour restarts (cash bar)
7:00 pm Dinner – $40.00 (cash, check, credit card)

Dinner Selection: Prime Rib or Virginia Spots

RSVP: 724-779-1860 (phone or fax) – NO cancellations after October 2

SEE ACCA W-PA October 2012 meeting notice FOR SIGN UP FORM AND MORE DETAILS.

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Filed under A/C and Heat Pump Products, Airflow, Combustion Analysis, Customer benefits, Energy Audit, Refrigeration Products, Training, Uncategorized

TruTech Adds Fieldpiece ™ Line

HVAC/R Contractors Offered More Cost Effective Instrumentation Choices
TruTechTools Adds Fieldpiece™ Line
Akron, OH (July, 2012) – TruTech Tools announces the addition of the Fieldpiece™ line of instrumentation to their online catalog.
Fieldpiece is the originator of the modular digital multimeter. The “stick” style digital multimeter (DMM) combined with accessory heads makes it easy to make electrical readings in the field plus enables technicians to easily test a wide range of other parameters.

The new Fieldpiece offering at TruTech Tools represents the progress made over twenty years of developing hand held instruments exclusively for the HVAC/R technician. Most of the Fieldpiece tools on the TruTech site are new or are significant upgrades from their predecessors. Each product has key features built-in that are needed by the HVAC/R technician. Fieldpiece products incorporate high versatility, cost effectiveness, and high field utility.

TruTech’s CEO and Co-Owner, Bill Spohn, notes, “We like Fieldpiece because it is designed for HVAC/R and not adapted to it. Fieldpiece meters offer the features HVAC/R technicians need and they work the way most technicians would expect. Modular expandability works very well for many customers. With many Fieldpiece products you can buy what you need now and look towards future modular upgrades as you can afford them.”

Founded in 2007, TruTech Tools serves the HVAC, Energy Audit, Building Performance, Weatherization and Home Inspection markets providing the best equipment, training, calibration and consulting services available. Find a complete listing of TruTech Tools instrumentation, training and services at

TruTechTools, Ltd.


Filed under A/C and Heat Pump Products, Combustion Analysis, Refrigeration Products, Uncategorized

500 Microns in 51 Seconds

YES YOU CAN! Check out Jim’s VIDEO on how to attach and use TruTech’s new RapidEvac Kit.

  • Pull a Vacuum 10x faster
  • Stay organized and productive
  • Stop Compressor Failures in their Tracks
  • Save Time and Labor Costs

These kits include the best of the best so you can have the right tools at your fingertips everytime. Learn more about RapidEvac Kits HERE.

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Filed under A/C and Heat Pump Products, Refrigeration Products, The Future, Training, Uncategorized

Testo 550 A/C Troubleshooting Guide and more….

TTT testo 550 troubleshooting guide

Testo 550 Common QandA or FAQs

testo 550-Quick-Start-Guide

testo 550 instruction manual


Filed under A/C and Heat Pump Products, Refrigeration Products, Uncategorized

523 556 560 Temperature Measurement

The Pt100 temperature probe on the Testo 500 series refrigeration instruments has been carefully designed to work under a wide range of applications while providing the fastest temperature response in the industry. The platinum based 4 wire construction of the sensor has exceptionally low mass and is shielded from electrical interference from ghost voltages or static electricity that are both common in refrigeration systems. When plugged into the instrument, an o-ring provides a liquid tight seal that will protect the instrument from water damage in the elements.

By design, the ceramic sensor only requires a slight pressure to achieve positive contact with the refrigerant line to get an accurate temperature response.  Because the temperature probe is constructed of ceramic, a very hard material, the probe has a tendency to rotate easily, and even by its own weight. Adjusting the tension of the spring to increase the clamping force is not recommended because it could crack the brittle ceramic sensor. (We found out the hard way!)  Adjusting the clamping force will have little effect on the grip of the sensor as it is the hardness of the materials used for construction that do not allow it to grip the line. If desired, a small piece of 1/8” silicone can be places around the probe clamp to curtail this problem. We found this especially helpful when working on smaller refrigeration systems.

 Because the resistance of a Pt100 sensor bears an absolute relationship to temperature, unlike a thermocouple whose output depends on the difference between the hot junction and cold junction or a thermistor that is not linear over a wide temperature ranges, no special compensating circuit needs to be provided in the electronics. In short, the Pt100 has a wide operating range, excellent accuracy, good linearity, excellent physical strength, long-term stability, and is the preferred sensor for all industrial processes where accuracy and repeatability are required.

Pt100 probes may be replaced without recalibration of the RSA instruments.  Sensors are available in lengths up to 40 feet. The Velcro-elastic strap provides insulation from ambient air along with positive contact to the refrigeration line from ¼” to 3” in diameter. Air and immersion probes are available to further enhance your testing applications.   

When measuring temperature probe position becomes critical for accurate troubleshooting. The Testo 500 series is designed to provide real-time measurement of pressure and temperature, and will respond to even the slightest variances in line temperature due to refrigerant flashing in the suction line (slugging). 

 Oil traveling back to the compressor at the bottom of horizontal runs will also affect the temperature measurement as oil is an excellent insulator.  When checking a TXV equipped system, we recommend that the probe is mounted with the temperature sensor in line with the thermostatic sensing element of the valve (Usually 3-7 o’clock) as close to the element as possible. This will provide the most accurate information on the TXV operation. When measuring liquid line temperature, the clock position of the probe is not critical.






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Filed under Refrigeration Products

Testo A/C Applications Guide

Testo Application Guide The Testo A/C Applications Guide is an invaluable resource for every techncian from entry level to senior.

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Trutechtools Training Tidbit

Testo 523 with hose holder

It has been four years since the US introduction of the first generation of Testo refrigeration products. Our new generation of the Testo line of refrigeration system analyzers (RSA’s) will continue to change the way the HVAC/R world troubleshoots, commissions and services AC & refrigeration systems. Although the first generation of refrigerant products was highly successful, Testo has listened to our customers’ desires to develop a product line with the diversity to meet your most demanding applications. Testo has completely retooled and reworked the refrigeration product design from the hook, which is now a quick locking carbineer, to a backlit sight glass that aids in refrigerant recovery allowing the technician to see when the last drops of liquid refrigerant are removed. Larger valve handles that can be recessed or extended make it easier for large or small hands to operate the gauge porting, and valves that can be field serviced or replaced without the need for special tools. Leading the refrigeration industry in innovative technology, Testo will again surpass your expectations in digital refrigeration technology. The next generation has incorporated a long list of new features that will increase measurement accuracy, reduce equipment-servicing time, and provide a means of tamperproof field verification, while streamlining field operations. Added this year in all instruments is the ability to print the measurement results on site via wireless printer, high stability ceramic relative pressure transducers, a large backlit display, and intuitive user operation. Three and four valve designs are available with a 3/8-evacuation port on four valve manifolds. High durability valve handles with Teflon seats, a backlit sight glass, and display, hose holder with integrated LCD protection, and in 556/560 models wireless temperature sensors and data logging. Incorporated into the 560 is also a vacuum sensor that reads in microns, “hg, or Pascal’s of pressure.  With its data storage capabilities (556/560), USB output, real-time graphic capabilities in the online mode, joined with the superior accuracy, no other product made can compete at any level.  After several years of rigorous testing in the lab and the field, the digital manifold has been proven to deliver laboratory accuracy results in demanding field service.  The multi-functionality, reliability, repeatability, and unique features set the Testo products apart from the competition.  Technicians will appreciate the ease of use, the wide range of applications, including the ability to upgrade to new refrigerants along with the wireless printing capabilities on all instruments from the Testo 523 to the Testo 556/560.  Small features like an integrated protective boot and lighter yet more robust design has not been overlooked on all models.  Future accessories for the 556/560 models including a wide variety of temperature probes, digital scale, amp clamp, and oil pressure transducer allow for quick verification of proper operation and field documentation or real-time monitoring and troubleshooting. Pressure-temperatures chart are a thing of the past, and commissioning equipment to anything less than the manufacturer’s standard will become uncommon for all Testo users.  Technicians can get more done with higher accuracy and quicker results than ever possible.  Field documentation can be done with little effort, providing any interested party with the information needed to evaluate system operation in the field or the office.   Testo has taken a quantum leap forward in AC/R measurements allowing anyone from the lab technician to the service technician to deliver consistently accurate results to owners, manufacturers and end users of air conditioning and refrigeration equipment  The Testo 523/556/560 digital refrigeration/air conditioning system analyzers are a multipurpose tool designed for every day use replacing a gauge manifold, superheat or subcooling thermometers, Pressure-Temperature charts, etc.. with a rugged hand held versatile tool.  

 Pressure Sensors

 Unlike traditional mechanical gauge sets, the Testo 523/556/560 has dual ceramic pressure transducers or pressure-measuring sensors; an advantageously used pressure measurement technology. Ceramic pressure-measuring cells have a measuring accuracy and repeatability that is stable over a very long time; therefore frequent calibration is not needed. The high and low side sensors are selected for an operating range that will provide the highest accuracy for their desired measuring range, allowing accurate pressure measurement over the full range on either side. (.5%fs) The different range of pressure transducers for the high and low sides respectively are calibrated in regards to their zero points, coefficient of thermal expansion, and sensitivity so they can be used in wide ranges of temperatures as extra-high precision pressure transducers. Ceramic pressure transducers are designed so the pressure sensitive part is exposed directly to the measured media. Thanks to excellent chemical resistance, ceramic pressure transducers do not require additional protection from oils, refrigerants, or acids and additionally will withstand the shocks from normal to rough handling without ever affecting the sensor calibration. While traditional gauges require frequent trips to a calibration house to assure their accuracy (often a procedure never performed), the calibration of the pressure transducers in the 523/556/560 is only recommended annually.  The ceramic pressure transducers or sensors can be field nulled, (often referred to as zeroing) and as good practice should be whenever refrigerant pressure is removed from the sensors, or when the hoses are purged to change refrigerant types.  A null value is different than having a value of 0, since 0 is an actual value. When a variable has no value, it considered being null. Because all standard pressure gauges are calibrated for sea level, (0 psig) if the sensor was zeroed rather than nulled, the current atmospheric conditions would not be considered. If the gauges were brought back to 0 psig outside of sea level, (a procedure often performed with mechanical gauges and some electronic) the accuracy of the gauge would be affected by the current elevation with respect to sea level. Because Testo uses a nulling procedure rather than zeroing, the instrument the sensor can be brought back into calibration in relation to the current atmospheric conditions or ambient pressure, which thus serves as a reference pressure. Quite simply, when there is no refrigerant pressure on the sensor, the reference pressure and the sensed pressure are the same. Nulling the RSA sensor brings it back to a perfect zero psig regardless of the atmospheric conditions provided the pressure is removed from the sensors. 

 Superheat and Subcooling Measurement

Thirty on board temperature pressure charts provide unparalleled detail and accuracy of refrigerant saturation temperatures, superheat and subcooling. Unlike traditional paper charts no interpolation of the temperature-pressure relationship is required.  It is now possible to measure and set superheat and subcooling with laboratory accuracy in the field as the Testo 523/556/560 reads pressures and temperatures to the tenth of a psi and tenth of a degree and automatically calculates real-time superheat and subcooling values. Temperature measurement is just as critical as temperature when commissioning and servicing equipment.  


The platinum based (platinum film on a ceramic substrate) 4-wire construction, of the spring loaded temperature sensor (Pt-100) has a very low mass (yielding a fast response) and is not affected by stray voltages that may be present on the refrigeration equipment. Unlike traditional K-type thermocouples, the sensor is electrically isolated from the RSA.  Isolating the temperature sensor electrically form the system eliminates the possibility of incorrect temperature measurement resulting from stray electrical currents or ghost voltages often present on improperly grounded refrigeration and air conditioning systems. Because the resistance of a Pt100 sensor bears an absolute relationship to temperature (unlike a thermocouple whose output depends on the difference between the hot junction and cold junction) no special compensating circuit needs to be provided in the electronics. In short, the Pt100 has a wide operating range, excellent accuracy, good linearity, excellent physical strength, long-term stability, and is the preferred sensor for all industrial processes where accuracy and repeatability are required. Additionally, Pt100 probes may be replaced without recalibration of the RSA instruments.  Sensors are available in lengths up to 40 feet. The Velcro-elastic strap provides insulation from ambient air along with positive contact to the refrigeration line from ¼” to 3” in diameter. Air and immersion probes are available to further enhance your testing applications.    


 Additionally incorporated into the system analyzer is a new dimension; time. The entire new generation of RSA products incorporates a real time clock that permits accurate documentation of the time and date readings were recorded via the wireless printer or data logging.  Testo was first-to-market with a complete line of refrigeration system analyzers that incorporate data logging, and now the first to bring wireless printing to the complete line. Owners of Testo combustion or other test equipment that already use a wireless printer will benefit from cost savings, as the printer is universal to all Testo products. Data logging (556/560) allows the service technician and or system analyst to evaluate system performance over a period of time from a snapshot to days with easy to use software, A printout of the final operating parameters on all RSA products allows for field documentation of operating at system startup or pre and post operation.   

Wireless Capability

The Testo 556/560 are both upgradeable to wireless temperature capability. Wireless technology will enable temperature measurement form remote locations for calculation of evaporator superheat at an outdoor condenser, monitoring of return and supply air temperatures for outside, or a remote outdoor air temperature. The wireless probes and the built in temperature probes can be assigned as needed for a number of field applications.    

Data Management

Wireless printing is standard in all models of the new generation of refrigeration analyzers. All measured and calculated parameters can quickly be field documented without error in seconds. Pre and post measurements allow for documentation of “as found” and “final” performance. System commissioning on new startups or major component repairs like compressor replacement are easily documented for the office and the customer.   The most significant advantages of data management and analysis are apparent when data from a Testo 556/560 is read, analyzed and managed in the Testo PC Software. It is now possible for the technician designer, engineer, service manager, or a lead technician to spot trends, benchmark systems, verify proper/design operation, provide real-time system operation to a manufacturer or other interested party in an tamperproof data format that can be graphed to provide a “digital window” into the refrigeration/air conditioning system. In the online mode, system high and low side pressures, saturation pressures, measured temperatures, along with superheat and subcooling can be viewed on an auto-scaling graph real time graphing format.  All measurements or each individual measurement can be viewed at once. System hunting, erratic operation, or other trends can be quickly spotted and documented using the optional software.  Testo has not overlooked small, but important details that make the products well suited for field use. Owners of Testo products have come to expect a rugged field service product with such features as water and acid resistance construction, a backlit displays and sight glass, user selectable units, and a battery life indicator to provide flexibility and reliability in their work.

Testo 523

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Filed under Refrigeration Products