50
P5417009-rev.6
•
The number of indoor units connectable to outdoor unit is as follows:
Comply with the following conditions when installing the unit.
•
A maximum total capacity and a minimum total capacity against the nominal outdoor unit capacity can be
obtained by combination of the indoor units.
NOTES:
1. For a system under which all the indoor units are supposed to operate simultaneously, the total indoor
unit capacity should be less than outdoor unit capacity. Otherwise, it may cause a decrease of operating
performance and operating limit in overload operation.
2. For the system under which all the indoor units are not supposed to operate simultaneously, the total
indoor unit capacity is available 100% or more against the outdoor unit capacity. Refer to Table 3.2
“System Combination” for detail.
3. When operating the outdoor unit in cold area with temperatures of 14
o
F (-10
o
C), or under the high heating
load conditions, the total indoor unit capacity should be 100% or less against the outdoor unit capacity
and the total piping length should be 984.3ft (300m) or less.
4. The airflow volume for indoor units of 6 and 8 MBH is set higher than that for indoor units of 12 MBH
or more. Make sure to select appropriate indoor units when installing indoor units where cold draft
may occur during heating operation. If installing indoor units in such places, refer to the recommended
number of connectable indoor units.
5. When installing an Energy Recovery Ventilation unit, the additional load must be considered when
calculating the maximum units that can be attached.
Outdoor Unit Capacity
(MBH)
72
96 120 144 168 192 216 240 264 288 312 336 360 384 408 432
Maximum Number
of Connectable I.U
15
20
26
26
36
40
46
52
56
59
64
64
64
64
64
64
Recommended Number
of Connectable I.U
8
8
8
10
12
14
18
18
20
20
22
24
28
30
30
30
