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System Design
(1) Combined installation criteria
If several outdoor units are installed on, for example, the roof of a building, the space required for normal
operating airflow may be insufficient, causing exhaust air from one outdoor unit to be sucked into another,
creating a kind of airflow short circuit. This can cause an increase in the effective ambient air temperature,
impeding cooling capability or even forcing emergency shutdown.
Therefore, when installing multiple GHP units, follow the instruction criteria below to ensure sufficient airflow.
Compared with cooling, the effect on heating is slight, so there should be no problems if the installation
criteria for cooling are satisfied.
Note: In unusual installation circumstances, give these criteria appropriate consideration when making
installation decisions.
(1) Scope of applicability of criteria
These criteria apply to installations in either of the following situations:
• When eight or more outdoor units are installed in combination
• When seven or fewer outdoor units are installed where walls are present that may impede air
circulation
(2) Conditions for combined installation
To ensure adequate airflow, the following conditions must be met in combined installations:
• Adequate spacing must be provided between each outdoor unit and between rows of units.
• Adequate clearance for airflow from the surroundings must be provided for the combined outdoor units.
(3) Parameters for combined installations
[1] Rows of outdoor units
L
= Average distance between outdoor units (m)
a
• When the distance between outdoor units is unequal, L
• Locate no more than three outdoor units near each other.
• If there are six or more units in a row, leave a one-meter gap every three units.
L
= distance between rows (m)
u
• All distances Lu should be equal.
L
= Row length (m)
N
L
= Depth of outside of installation (m)
M
L
= Distance from wall to nearest outdoor unit (m)
W
• If no wall, LW = 6.
U
= Width of outdoor unit (m)
W
U
= Depth of outdoor unit (m)
D
5. Outdoor unit positioning requirements
is the average.
a
D-18
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