IV Produkt Control Unit IVC3
IVC3 Basic Manual 2004-12-15.doc
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IVC3 has integrated PI-regulators for cooling and heating. PI-regulator parameters are not
changeable:
Heat seq.
Cool seq.
P-band
17
°
11
°
I-time
2 min
3 min
2.10 Night cooling
Night cooling is selected from operation terminal (Not installed / Installed).
Facilities are chilled with fresh outdoor air.
IVC3 measures outdoor temperature continuously during operating time to decide if night cooling are
possibly after ordinary operating time. Night cooling is allowed if outdoor temperature constantly has
exceeded 20° during one hour.
2.10.1 Night cooling, extract air temperature sensor
The IVC3 will after operating-time wait a set delay before starting night cooling. Controller measures
extract air temperature for 5 minutes to decide if night cooling is needed. If extract air temperature
after check exceeds set start limit (Night cooling start) the unit run until extract air temperature are
more than 1° below start point. Unit will in night cooling run on forced speed SA and EA. Cooler,
recovery and heater are always blocked during night cooling.
2.10.2 Night cooling, room temperature sensor
Controller measures continuously room temperature to decide if night cooling is needed. If room
temperature exceeds set start limit (Night cooling start) the unit will start for night cooling until room
temperature are more than 1° below start point. Unit will in night cooling run on forced speed SA and
EA. Cooler, recovery and heater are always blocked during night cooling.
2.10.3 General conditions for night cooling
During night cooling the controller continuously compares extract air (or room) temperature with
outdoor temperature for to decide if there are chill effects (extract air or room temperature has to
exceed outdoor temperature with at least 4° to allow night cooling). When no chill effect are available
the night cooling are shut down and (with extract air sensor) would not start until after a new start
delay. With room sensor night cooling will start when chill effects are available.
Night cooling has a minimum run time of 20 minutes.
Heater is blocked 3 hour after night cooling.
2.10.4 Night cooling, settings
Setup
Setting
Description
Night cooling
Not installed/
Installed
Select if night cooling is to be used.