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.
(CLT1.com photo)
18
ACTION * May 2015
http://www.CLT1.com
Table of Contents for the Digital Edition of ACtion Magazine - May 2015
Tool and equipment review
MACS mobile A/C training is everywhere
Outlook
Service Port
Leonard's Law
Virtual View
Last Watch
By the numbers
Industry News
Association News
In Memoriam
Classified
ACtion Magazine - May 2015
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