Mitsubishi Heavy Industries FDC1000KXZWE1, Руководство по обслуживанию

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'14 • KX-SM-200
(5) Defrosting
The time conditions for defrosting only is implemented for the heating oil return operation.
〔 Time conditions for defrosting 〕
(a) Starting condition
When all of following conditions ①～⑦ are established
①
Heat source unit operation mode: Heating
② When the accumulated system operation time has exceeded minutes or more after starting the heating operation
③
When the accumulated system operation time has exceeded minutes or more after ending the last defrosting
④ It has elapsed 1 minute and seconds after the heating compressor ON.
⑤
Following cases are excluded:
・ Operating in the capacity measurement mode
・ Accumulated compressor ON time is less than 0 minutes at the power ON
⑥ When the oil return start conditions are established (increased amount of oil loss or elapse of setting time), or when the
“Forced oil return control input” is changed from the “Invalid (open)” to the “Valid (shorted)” by the allocation of exter-
nal input functions.
⑦
Time conditions for defrosting cancel setting for the software input is invalid.
(b) Contents of control
Status 1: From the defrost start condition to the end of -way valve switching and the completion of preparation for compres-
sor rpm UP.
Status : After the end of Status 1 to the establishment of defrost end condition.
Status : From the end of Status to the compressor rpm DOWN.
(c) Ending condition
When one of the following conditions is established.
① At the end of the defrost status .
②
When the heat source unit operation mode has changed to any other than the heating.
③ Stop of all compressors after detecting an anomalous condition.
④ During pump down control after defrosting stopped.
⑤ When the pump down for replacement control began.
before Status 1 Status 2 Status 3 After
Compressor
Heating
operation
Stop Reset
Compressor rpm on all
units < Min. rpm
Compressor rpm on all
units = Max. rpm
20SH ON
(115 seconds after)
OFF
Maintain Maintain ON
4 way valve
20SM OFF
(115 seconds after)
ON
Maintain Maintain OFF
EEVW
Normal
control
(115 seconds after)
Full open
Maintain Fully shut
Normal
control
EEVSC
Normal
control
Fully shut
Maintain
Maintain
Normal
control
EEVG
Normal
control
Fully shut
High pressure control
Fully shut
Normal
control
SVO OFF ON Maintain Maintain OFF
SVR ON OFF Maintain Maintain ON
EEV for indoor unit
Normal
control
Aperture command is sent
depending on condition.
Maintain Maintain
Normal
control
Operation of functional component