Check Items before Troubleshooting Si30-408
70 Troubleshooting
2.2 Check for Malfunction in Cooling Operation
When cooling malfunctions, check on the following factors to specify the state of malfunction
(peculiar on site). (In order to avoid an insufficient investigation at the initial check)
<At the time of ordinal operation, starting-up, oil return operation>
Make sure that the timing of cooling malfunction generation.
If EV opening of all indoor units are the same degree, the instruction (control) for valve opening
degree is sent from the outdoor unit.
Make sure to grasp the state by using the checker.
Year round cooling Outdoor unit short circuit
· Low outdoor temperature control · High pressure stepping down (protection) control
Excessively light load, short circuited in indoor unit,
erroneous selection of model
Excessively heavy load,
erroneous selection of model
· Low pressure stepping down (protection) control · Cooling overload control
Large pressure loss
· For operation with the target evaporating temperature
or lower (Unbalance between load and control)
Server, equipment room, etc.
· Actuation of freeze-up prevention · Cooling overload control
Low High
Low High
Small Large
Small Large
Outdoor temperature
Indoor temperature (WB)
Indoor unit operation capacity, EV opening degree
Piping length, difference in vertical level
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