Hitachi CH-Box Installation Manual page 3

Interchangeability between Current and New CH-Boxes
● New CH-Box is compatible for the new outdoor unit.
Current CH-Box is compatible for the new outdoor unit with limitation.
Refer to the Technical Manual for the outdoor unit for more details.
Current outdoor unit is compatible with current CH unit only.
(When the New CH-Box is connected to current VRF outdoor unit, the unit will not operate and the wired
controller will display the alarm code "C4".)
Current CH Unit
New CH-Box
● Current and new CH-Boxes can not be used in the same system together.
● Production of current CH unit shall be discontinued. However, it will be supplied for servicing and
maintenance until further notice. Contact us if there are order request for the current CH unit.
P5417025-rev.1
4
4
Current VRF (Heat Recovery)
×
×
4
4
New VRF (Heat Recovery)
4
4
4: Available
×
: Not Available
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