Hitachi PC-ARF Technical Catalogue page 493

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6 Building air conditioning controls

CSNET WEB (PSC-A160WEB1)

In VRF systems, when load is very low and only few units are working in a system, it is possible that discharge air tem-

perature 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.

C A U T I O N

If one unit is configured 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.

Configurable 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 finishing the forced Thermo OFF.

Compressor Delay (min): Minimum enforced time between two compressor start up when start required by Cold Draft

Minimum Thermo ON Time (seconds): Minimum time that should be in Thermo ON before accepting a new Thermo

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.

TCGB0106 rev.0 - 12/2014

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