12 Maintenace notes
467
SMGB0064 rev.0 - 08/2011
12
12.6 Not cooling well due to insufcient installation space for the outdoor unit
Question and answer for the eld work
Example 5: Not cooling well due to insufcient installation space for outdoor unit
Phenomenon
Cooling operation was well performed through the intermediate season. However the cooling operation was not well avai-
lable when the outdoor temperature was higher than 35 °C.
Cause
As the outdoor units were installed without a sufcient 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 600 mm between each outdoor unit’s back the
hot discharged air from other outdoor units was circulated.
Countermeasure Ensure that sufcient space should be secured for multi-row and multiple-installation.
Keep a distance of more than 15 mm between other units
and do not put obstacles on the right and left sides. Dimen-
sion B is as shown below.
L A B
0 < L < 1/2H 600 or more 300 or more
1/2H < L < H 1400 or more 350 or more
N O T E
• If L is larger than H mount the units on a base so that H is greater or equal to L.
• In this situation ensure that the base is closed and does not allow the airow to short circuit.
• When the mark * dimension is secured be sure to mount the airow guide.
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