Werbung
Verfügbare Sprachen
Verfügbare Sprachen
Operation and configuration of packaged units
4.6.9 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.
!
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 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.
56
PMML0303A rev.2 - 02/2015
Werbung
