5-2
FIELD WORK INSTRUCTION
[Countermeasure]
Setting for DSW3 was changed.
[Remarks]
Pay a special attention to the liquid pipe size if the lift between the indoor units and outdoor unit is
higher than 20 meters. For details, see the “Piping Work” in TCII.
Question and Answer for Field Work
Example 2: Insufficient Cooling Performance When A Long Piping
Is Applied
[Phenomenon]
Sufficient cooling was not available for an indoor unit which located at the farthest position.
[Cause]
In the case that an outdoor unit is located 20 meters lower than indoor units, resetting of the dip
switch, DSW3 is required.
However, no setting was performed. Therefore, the target discharge pressure was not increased,
resulting in insufficient cooling performance for the indoor.
5.2 Insufficient Cooling Performance When A Long Piping Is Applied
I.U.
Insufficient
Cooling
O.U.
DSW3
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