Pump Down Operation when Replacing The Compressor
SiE-05C
336
Special Service Mode PLUS Series
2. Pump Down Operation when Replacing The Compressor
2.1
Pump Down Operation when Replacing The Compressor
Pump down operation is when refrigerant is removed from an outdoor unit if it malfunctions. In this
case, outdoor units operate in the cooling mode and indoor units are automatically turned on by
thermostat.
2.1.1
Method
1. Fully shut stop valves of the liquid and pressure equalizing pipes of the unit from which you
want to pump down refrigerant.
(Pressure equalizing pipe open for simultaneous cool/heat type)
2. Set to pump down mode in setting mode 2 and execute pump down operation.
(See the following page for details.)
For the simultaneous cool/heat type, it takes 3~10 minutes for the compressor to start
operating.
LED 23~26 are for monitoring low pressure during operation.
Outdoor units stop for approximately 1 hour.
3. After about 50 minutes, shut the stop valve of the gas pipe. (Outdoor units stop for
approximately 1 hour.)
4. Operation is complete if after 10 minutes elapse the pressure of the pumped down outdoor unit
is ambient temperature equivalent saturation pressure or lower. If not, repeat steps 1~4.
5. Purge the remaining pressure and perform servicing.
6. After sealing and vacuum drying, fill with gas until ambient temperature equivalent saturation
pressure is reached.
7. Shut the stop valve.
Note:
Perform the procedure when outdoor temperature is in the range of 10˚C
~
35 ˚C.
Part9.fm Page 336 Wednesday, January 31, 2001 9:10 AM
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