P5417009-rev.6
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Interchangeability between Generation 1 and 2 Change-Over Boxes
● Generation 2 change-over box is compatible with the generation 2 outdoor unit.
● Generation 1 change-over box is compatible with the generation 1 outdoor unit when there is no
generation 2 change-over box in the same system.
● Generation 1 change-over box is compatible with the generation 2 outdoor unit with limitations of the
operating temperature range and the connectable indoor unit capacity ratio.
See the following table “Limitations for Combination of Generation 1 Change-Over Box and Generation 2
Outdoor Unit” for details.
● Generation 1 and 2 change-over boxes can not be used in the same system together.
● Production of generation 1 change-over box shall be discontinued. However, it will be supplied for
servicing and maintenance until further notice. Regarding order requests for the generation 1 change-
over box, contact Tech Support at: 1-844-873-4445 (option 2).
Determining Propriety of Connection between
Change-Over Box and VRF Outdoor Unit (Heat Recovery)
Model of Change-Over Box
and VRF Outdoor Unit
Change-Over Box
Generation 1 Generation 2
Single Branch Type Multiple Branch Type Single Branch Type Multiple Branch Type
COBS048B21S
COBS096B21S
-
COBS048B22S
COBS096B22S
COB04M132B22S
COB08M264B22S
COB12M264B22S
VRF Outdoor Unit (Heat Recovery)
Generation 1
208/230V Type
(H,Y)VAHR072B31S
(H,Y)VAHR096B31S
(H,Y)VAHR120B31S
Available Not Available
460 Type
(H,Y)VAHR072B41S
(H,Y)VAHR096B41S
(H,Y)VAHR120B41S
Generation 2 (This Manual)
208/230V Type
(H,Y)VAHR072B32S
(H,Y)VAHR096B32S
(H,Y)VAHR120B32S
(H,Y)VAHR144B32S
(H,Y)VAHR168B32S
(H,Y)VAHR192B32S
Available Available
460V Type
(H,Y)VAHR072B42S
(H,Y)VAHR096B42S
(H,Y)VAHR120B42S
(H,Y)VAHR144B42S
(H,Y)VAHR168B42S
(H,Y)VAHR192B42S
Limitations for Combination of Generation 1 Change-Over Box and Generation 2 Outdoor Unit
Temperature
Cooling Operation Range
Indoor °F WB (°C WB) 59 (15) ~ 73 (23)
Outdoor °F DB (°C DB) 23 (-5) ~ 109 (43)
Heating Operation Range
Indoor °F DB (°C DB) 59 (15) ~ 80 (27)
Outdoor °F WB (°C WB) -4 (-20) ~ 59 (15)
Cooling & Heating
Operation Range
Indoor (Cooling Side) °F WB (°C WB) 59 (15) ~ 73 (23)
Indoor (Heating Side) °F DB (°C DB) 59 (15) ~ 80 (27)
Outdoor
°F DB (°C DB) 23 (-5) ~ 75 (24)
°F WB (°C WB) 22 (-6) ~ 59 (15)
Connectable Indoor Unit Capacity Ratio
Maximum 100%
Minimum
Depending on Outdoor Units
(Refer to Table 3.2 for details.)
DB: Dry Bulb, WB: Wet Bulb
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