Item
number
Safety consideration
8 Ensure the area is in the open or that it is adequately ventilated before opening the
system or while conducting any hot work. The ventilation must safely disperse any
released refrigerant and preferably expel it externally into the atmosphere.
9 Ensure that the sensor is not obstructed in any way.
Room size requirements
Table 1:
Item
number
Safety consideration
1 If the unit must be installed in a residence with a total conditioned area less than what
is determined to be the minimum from Table 2, then that room must also not have
any continuously operating open flames or other potential ignition sources. A flame-
producing device may be present if that device is provided with an effective flame
arrest.
Table 2: Minimum room area
System charge (lb-oz) Minimum room area
(ft
2
)
Minimum total
conditioned area (ft
2
)
Minimum system
airflow (CFM)
4-0 43 58 233
4-4 46 61 248
4-8 48 65 262
4-12 51 69 277
5-0 54 72 291
5-4 56 76 306
5-8 59 80 321
5-12 62 83 335
6-0 64 87 350
6-4 67 90 364
6-8 70 94 379
6-12 73 98 393
7-0 75 101 408
7-4 78 105 422
7-8 81 108 437
7-12 83 112 452
8-0 86 116 466
8-4 89 119 481
8-8 91 123 495
8-12 94 127 510
9-0 97 130 524
9-4 99 134 539
9-8 102 137 554
9Installation Manual: R-454B Outdoor Split-System Air Conditioner
Johnson Controls Ducted Systems
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