Not Cooling Well Due To Insufficient Installation Space For The Outdoor Unit - Hitachi RAS-5HVRNM1E Service Manual

12 Maintenace notes

12.6 Not cooling well due to insufficient installation space for the outdoor unit

Question and answer for the field work
Example 5: Not cooling well due to insufficient installation space for outdoor unit
Cooling operation was well performed through the intermediate season. However, the cooling operation was not well available
Phenomenon
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
Cause 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 sufficient space should be secured for multi-row and multiple-installation.
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 airflow to short circuit.
• When the mark * dimension is secured, be sure to mount the airflow guide.
463
SMGB0060 rev. 1- 12/2010
Keep a distance of more than 15 mm between other units and
do not put obstacles on the right and left sides. Dimension B
is as shown below.
L A
0 < L < 1/2H 600 or more
1/2H < L < H 1400 or more
B
300 or more
350 or more
12