Not Cooling Well Due To Insufficient Installation Space For Outdoor Unit - Hitachi FSG Series Service Manual

5.5.

NOT COOLING WELL DUE TO INSUFFICIENT INSTALLATION SPACE FOR OUTDOOR UNIT

n Question and Answer for Field Work
Example 5: Not Cooling Well due to Insufficient Installation Space for Outdoor Unit
Phenomenon
Cause
Countermeasure
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.
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.
Fence
To protect the unit from a short circuit, fences were mounted at the discharge air side as
shown below.
FIELD WORK INSTRUCTION
Min.
300mm
Min.
300mm
5
3