What is the difference between an InRow RP, InRow RD (600mm), and InRow RC (600mm)?

Issue:
What is the difference between an InRow RP, InRow RD (600mm), and InRow RC (600mm)?
 
Product line:
ACRPxxx, ACRC5xx, ACRD5xx
 
Environment:
Data Center Cooling
 
Cause:
 
Resolution:
The InRow RP comes with all the standard features including electric reheat and humidity control.  Whereas the 600mm InRow RD and RC do not.  These units are the equivalent to an InRow RP with the exception they are not equipment for electric reheat and humidification control.  If you purchase one of these it is required to have the proper load.  The minimum required kW for 1 direct expansion unit is 12kW and 12kW for chilled water. There should also be a consideration regarding humidity control.  Due to the lack of heaters, removal of  humidity in the room is through over cooling the space.  There is a propensity for excessive moisture to build up.
 

Model#	Reheat	Humidification
ACRP10x	yes	yes
ACRP50x	yes	yes
ACRD50x	no	no
ACRC50x	no	no
ACRD60x	no	no
ACRD60xP	yes	yes

x = denotes this applies for 208 and 460v.