5-5
FIELD WORK INSTRUCTION
Question and Answer for Field Work
Example 5:
Not Cooling Well due to Insufficient Installation Space
for Outdoor Unit
[Phenomenon]
Cooling operation was well performed through the intermediate season. However, the cooling
operation was not well available when the outdoor temperature was higher than 35
°
C.
[Cause]
As the outdoor units were installed without a sufficient installation space, the hot discharge air from
other outdoor units was circulated.
In this case, though the outdoor temperature was 35
°
C, the actual suction air temperature was nearly
50
°
C and Protection System from Excessively High Suction Pressure was activated, the frequency of
the compressor was decreased and the cooling capacity was also decreased accordingly.
As the outdoor units in-line were installed back to back with a distance of 600mm between each
outdoor unit’s back, the hot discharged air from other outdoor units was circulated.
[Countermeasure]
To protect the unit from a short circuit, fences were mounted at the discharge air side as shown
below.
5.5
Not Cooling Well due to Insufficient Installation Space for Outdoor Unit
Fence
Min.
300mm
Min.
300mm
