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Our
Technology
If you are a
contractor that would like use this technology to differentiate your
business and make more money; learn
more by clicking this link
 DTRossi, Inc. is uniquely positioned in the service
industry because of our innovative approach to business. Our focus on
maintaining, rather than replacing, HVAC systems motivated us to develop
and document superior processes and technology to detect and diagnose
maintenance problems. We use the Honeywell Service Assistant that quickly and
accurately identifies system faults in the field based on the data it
collects.
How the Service Assistant Works
The Service Assistant combines the
functions of the manifold pressure gauge, digital thermometers and
electronic inspection forms using algorithms embedded in the palm pilot
hand-held computer. The DTRossi, Inc. technician simply connects the
manifold hoses to the high and low side pressure taps, attaches the
temperature probes to the suction and liquid lines, and the Palm Pilot
gathers the data and performs the necessary calculations to accurately
diagnose a fault in the system. The Palm Pilot quickly converts the
data into an accurate, easy to understand diagnosis of the unit.
Some of the diagnostic examples
that a technician might see include:
- No service
required
- Dirty
condenser
- High or low
refrigerant charge
- Liquid line
restriction
- Reduced
evaporator fan speed
Handtool Data
 All information relevant to the refrigeration
cycle is obtained mechanically, in a matter of minutes. Data collected by
the Handtool includes: Suction Pressure (SP), Suction Temperature (ST),
Liquid Pressure (LP), Liquid Temperature (LT), and Ambient Air Temperature
(AMB). The data is then manipulated by mathematical equations that provide
the following information: Evaporating Temperature (ET), Suction Line
Superheat (SH), Liquid Line Subcooling (SC), Condensing Temperature (CT),
and Condensing Temperature/Ambient (COA).
Sample Handtool Efficiency
Report: Single Unit
The data above was taken from a
single unit operating under normal conditions in the northeast United
States. Using traditional methods, most air conditioning technicians would
accept these readings as perfectly normal (Diagnosis: no service
required). Using the additional information provided by the Service
Assistant (EI: 81), we see an
opportunity to achieve approximately $760 (19% efficiency improvement) in
annual energy savings simply by cleaning the unit.
When multiple HVAC units exist
across a geographically dispersed portfolio,
opportunities to achieve significant savings from targeted maintenance will
inevitably exist. We have collected data from rooftop air conditioners in
the
US. When comparing the costs of energy inefficiency to those of maintaining
the air conditioners to an acceptable performance range, we project that
the
use of targeted maintenance could produce an opportunity for energy savings
of $1,000,000 from a $250,000 maintenance investment.
There are a number of ways
in which our use of technology and processes are changing the HVAC
industry.
- Instant
access to all relevant information dramatically increases technician
productivity and visibility
- System
diagnosis is objective and measurable, minimizing call backs
- Scientifically
prioritized service and maintenance schedules optimize maintenance
dollars
- Preventive
maintenance reduces the incidence of catastrophic failure
- Service data
is recorded on the Service Assistant, then downloaded, providing a
permanent maintenance history
- Computerized
cost/benefit analysis of maintenance options provides maximum energy
cost savings
HVAC Self-Performed Services
Utilizing our Advanced Technology
- Planned
preventive maintenance inspections
- Seasonal
starting and testing of all equipment
- Time and
material, not to exceed service work
- Pre-construction
equipment survey
- Post-construction
verification survey
- Control
system design, installation, and troubleshooting
- Fault
detection & diagnostic building controls
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