ACtion Magazine - May 2015 - (Page 18)

Tool and equipment review CLT1 the computer control over the A/C output via a solenoid valve provides a precise way to adjust cooling output. The solenoid valve responds to computer control by changing the duty cycle of the solenoid. And with pressure gauges connected and the system operating, you can see the system pressures change as the duty cycle goes up, which increases the displacement of the compressor and therefore the cooling output of the A/C. This is not unlike the way an all-mechanical internal control valve works, but the computer control is far more precise, because the cooling load is precisely calculated from the sensor inputs. Five compressor suppliers with OE applications that use the electronically-controlled design are Denso, Delphi, Zexel/Valeo, Calsonic and Sanden. The control valve circuit can be tested with a scan tool that has the appropriate bi-directional controls, but that means OE models. For the aftermarket there has been one control valve test tool on the market for several years, the CLT1, sold by Santech and Four Seasons, and now there's a second, the Electronic Control Compressor System Scanner, featured at its display by Global Parts Distributors. The two are noticeably different, but both can perform the same primary test: pressing buttons on the tester to change the duty cycle of the solenoid valve. While that This was the first tester for solenoid valves introduced in the U.S., imported from Europe. It enables a technician to command duty cycles and see how system responds. ( photo) 18 ACTION * May 2015

Table of Contents for the Digital Edition of ACtion Magazine - May 2015

Tool and equipment review
MACS mobile A/C training is everywhere
Service Port
Leonard's Law
Virtual View
Last Watch
By the numbers
Industry News
Association News
In Memoriam

ACtion Magazine - May 2015