6 Building air conditioning controls
CSNET Manager LT/XT
TCGB0106 rev.0 - 12/2014
567567
6
Cold draft
In VRF systems, when load is very low and only few units are working in a system, it is possible that discharge air
temperature is reduced below comfort value. With this new option HITACHI improves comfort for these situations by setting
unit to Fan Mode when discharge air temperature is below comfort temperature and set unit again to Cooling Mode when
temperature will be again inside comfort range.
CAUTION
If one unit is congured to use cold draft function it should never be set in fan mode is considered the same as cooling mode Thermo-OFF
and unit will be automatically changed to cooling mode.
Congurable parameters
• Option Enabled: Activate/not activate cold draft option in the selected indoor unit.
• Target Outlet Temp (ºC): Minimum outlet temperature that we accept in this room in order to force the Thermo OFF.
• Outlet temp Restart: Temperature that unit is nishing the forced Thermo OFF.
• Compressor Delay (min): Minimum enforced time between two compressor start up when start required by Cold Draft
option.
• Minimum Thermo ON Time (seconds): Minimum time that should be in Thermo ON before accepting a new Thermo
OFF.
• Minimum OFF time (seconds): Minimum time that unit should be Thermo OFF before accepting a new Thermo ON.
Considerations of cold draft
Cold draft option only can be visible for user if this has request privilege. This function should only be used in system where
there are comfort problems and after problem study.
To Next Page
Loading...
