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PROCESSING AT OVERHEAT THERMISTOR (OH) HIGH TEMPERATURE
Restriction Start Conditions
[operating two units] in common for cooling and heating
* When either expansion valve counts 480 pulses and the OH temperature > 97 'C=> the compressor speed will decrease at a rate of
100 min"/30 second.
[Operating one unit for cooling]
* When the expansion valve of the operated unit counts 480 pulses and the OH temperature > 97 C= the compressor speed will
decrease at a rate of 100 min*/30 second.
[Operating one unit for heating]
¢ When the expansion valve of the operated unit counts 480 pulses and the OH jemiperatre 2 97 'C= the expansion valve of stopped unit
will open until 250 pulses are counted at a rate of 20 pulses/20 second.
* When the expansion valve of the operated unit counts 480 pulses and the OH temperature
> 97 'C= the compressor speed will
decrease at a rate of 100 min*/30 second.
** The decreasing rotation speed is based on that when reduction processing is started and will hold until decreasing is finished. However, the
teference rotation speed will be replaced only when the target speed is lower than that when reduction processing was started.
* Reduction of compressor speed is inhibited when the OH temperature is between 94 'C and 97 'C and does not rise from 30 seconds before.
Restriction Release Condition (in common for all)
* Restriction is released when the OH temperature < 94 'C and the compressor speed increases at a rate of 50 min/30 second to restore
the target speed.
When two units are operated for heating:
Unit 2
Cooling output a
ee
eee
Heating output
[FF
e
Turns on
$
for cooling
22]
Tums on
:
«S|
forheating
:
Outdoor fan
[FF
i
OH
temperature
Compressor
rotation speed
Decreases by 100 min'/30s
Increases by 50
MINRPM
:
~of- ---+4--4--
"7
pa
°
ee
renee
Expansion
valve
ee
Oe
ee
ee
ee
ee
reco
Ee
Se
SS
Sea
K- Operation when two units are operated for cooling is similar to that shown above.
+ WMAX2 and MINRPM are EEPROM data.
* See other sections for details of expansion valve TD control,
AN correction and distribution control.
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