Design
D - 15
(1) Combined installation criteria
If several outdoor units are installed on the roof of a building, for example, the air path for a normal maintenance
space is insufficient, as exhaust air from the outdoor unit can be again sucked into the outdoor unit, to create a kind
of short circuit.
Because of this the surrounding air temperature can rise, and the cooling capacity can reduce significantly, or an
emergency stop may occur.
When making a collective installation with GHP, in order to ensure a sufficient air path the following installation
criteria must be followed. Also, compared with cooling, the effect on heating is small, so if the cooling criteria for
installation are followed there should be no problem.
*For unusual installation circumstances, consider these criteria appropriately before making decisions.
1Scope of applicability of criteria
These criteria are applicable to installations satisfying either of the following two situations.
• When there are eight or more outdoor units in a combined installation
• In installations with seven or fewer outdoor units but in the surroundings there are walls that might prevent
the circulation of air.
2Conditions for a combined installation
In order to secure the necessary air flow, the following two conditions must both be satisfied in a combined
installation.
• The space between outdoor units and rows of outdoor units must be well maintained.
• The area of flow of air from the surroundings to the combined outdoor units must be well maintained.
3Parameters of a combined installation
Rows of outdoor units
La: average distance between outdoor units (m)
• When the distance between outdoor units is not equal, the distance La is the average.
• Position only up to 3 outdoor units near each other. For more than 3 units leave a prescribed distance every 3 units.
• If there are 6 or more units in a row, leave a gap of 1m every 3 units.
Lu: distance between rows (m)
• All Lu are to be equal.
L
N
: Row length (m)
L
M
: External dimension of the installation (m)
L
W
: Distance between the wall and the closest outdoor unit (m)
• When there is no wall L
W
= 6.
U
W
: Width of outdoor unit (m)
U
D
: Depth of outdoor unit (m)
5. Criteria for positioning the outdoor unit
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