Si30-408
What Service Checker Can Do
Service Checker Type3 Application Edition
131
To Conduct
Analysis
If you
collect or analyze data on the Service Checker
:
First of all, make the pass/fail judgment on functional parts.
For accurate data collection, be sure to check the functional parts for any problem.
Case example: Even though the thermistor showed a normal value at an ambient
temperature, the detection data got out of order with increasing temperature.
(Particularly, in order to collect data on products manufactured in many years ago, give
consideration to the case example aforementioned.)
Focus much attention on the quotient of "Condensing temperature / Evaporating
temperature" rather than that of "High pressure / Low pressure".
The Service Checker expresses the quotient of "High pressure / Low pressure" in a value
through converting the quotient into the pressure equivalent saturation temperature and
uses it as the target value for the capacity control. Therefore, it is immediately obvious
whether or not the target temperature is achieved.
Check "each stepping down and protective control" for the operating conditions and
look at why this control is performed.
Each stepping down and protection control is used to ensure reliability, not to protect
malfunctions.
For example, do not determine that "the system does not cool (or heat) due to the activation
of the control". Verify why the control is activated, referring to other data.
Are "discharge superheated degree and suction superheated degree" kept at proper
levels, respectively?
Most of malfunctions in compressors result from "wet operation". Referring to the diagnosis
procedure on the preceding page, check to be sure the discharge and suction superheated
degrees are kept at proper levels.
Data on indoor units
Data on temperatures and motorized valve opening degrees of indoor units are updated
every five minutes. By contrast, data on outdoor units are updated earlier than that. As a
result, even though data on outdoor units are able to be collected, the data on indoor unit is
not synchronized with that while in malfunction. (Performance data and ON/OFF operation
data are updated on an as-needed basis.
In order to verify the data on indoor units, be sure to give consideration to the said point.
* The time to store data in the Service Checker follows the PC clock.
Before using the Service Checker, be sure to set the PC clock to the real time.