IV Produkt Control Unit IVC3
IVC3 Basic Manual 2004-12-15.doc
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1. Introduction
The control unit IVC3 is used to control an Air Handling Unit (AHU) with supply and
exhaust air fans, revolving heat recovery (Rot VVX), heater (electric or water) and
cooler
.
2. Function
1.1 Start up
At start up the exhaust fan (EA) starts at set speed and the heat recovery at 100%. After 1 minute the
supply fan (SA) starts and control unit starts temperature regulation.
If the heater is a water-heater and outdoor temperature are below “temp. pump stop” the valve for
water-heater open to 50% during upstart.
2.2 Service-switch by operation unit (Settings menu – Fan Mode)
Four different operation modes can be set; STOP, NORMAL, FORCED and AUTO.
Settings
Setting
Description
Fan mode
Stop
Normal
Forced
Auto
Unit stopped
Unit operates with SA and EA at normal speed
Unit operates with SA and EA at forced speed
Unit operates with fan speed according to time schedule
2.3 Fan speed, normal and forced
Four different operation modes can be set; STOP, NORMAL, FORCED and AUTO.
Settings
Setting
Description
SA normal
0-100%
SA peed at normal speed
EA normal
0-100%
EA peed at normal speed
SA forced
0-100%
SA peed at forced speed
EA forced
0-100%
EA peed at forced speed
2.4 Revolving heat recovery (VVX)
VVX can be configured as Analogue or Digital.
Setup
Setting
Description
Config. VVX
Analog/Digital
Selection if VVX is to be controlled by an analogue (o.10V)
or a digital output.
Configured as digital VVX the heat recovery will start and stop intermittent:
VVX-signal
Digital VVX
0-33%
3 min run, 3 min stop
34-66%
9 min run, 3 min stop
67-100%
Continuous run
When a substantial temperature difference is detected IVC3 will immediately shift to the correct
sequence without waiting for cycle time to run out.
Configured as analogue VVX the controller will only use the analogue output (0…10V DC).
