EN
VTS reserves the right to implement changes without prior notice
Advanced manual
33
chiller). The selected season must correspond to
the actual setup of the hydraulic valves.
Emergncy
– emergency stop – to force
immediate stop of the AHU
AlarmAck
– alarm acknowledge – to cancel currently displayed alarms
Note!
No need to enter the password
Uni.Reg.
– the input can enter the logic block of the Universal Regulator, see the relevant chapter for
details
Availability:
all applicatios without glycol pre-heating coil
DI7 function
– setting for universal binary input
Possible functions:
No func
. – no function, input disabled
System
– input occupied by the application
LockUnit
– the input blocks start of the AHU, must be closed to allow unit operation
Extern.1
– external control input 2 – for remote control of AHU operating mode. The functionality
depends on combination of the inputs. See the details in the chapter “External control”
Sum/Wint
– season selection switch – used in combi-coil applications, where one coil can be
switched to heating in winter (fed from boiler) or to cooling in summer (fed from chiller). The selected
season must correspond to the actual setup of the hydraulic valves.
Emergncy
– emergency stop – to force immediate stop of the AHU
AlarmAck
– alarm acknowledge – to cancel currently displayed alarms
Note!
No need to enter the password
Uni.Reg.
– the input can enter the logic block of the Universal Regulator, see the relevant chapter for
details
Note!
If both inputs carry the same function at a time, the logical sum OR will be calculated and
applied to the control algorhitms
Availability:
all applications
AI7 function
– setting for universal analog input
Possible functions:
System
– input occupied by the application
FreqSup
– frequency scaling for supply fans, 0..1V low voltage input – 0V = 0%, 1V = 100%
FreqExh
– frequency scaling for exhaust fans, low voltage input
E
– frequency scaling for supply and exhaust, low voltage input
Note!
The frequency scaling signal affects the current valid setpoint from the program. Example:
current AHU mode: Econo
original fan setpoint for Econo 55%
frequency scaling: 80%
final
setpoint with scaling: 55% x 80% = 44%
The
fi
nal setpoint can never fall below the min. frequency con
fi
gured for the frequency converter.
TempSet
- temperature setpoint, low voltage input – 0V = -3°C,
1V = +3°C
Note!
Value from the input is an offset to the original setpoint from the program. Example: Original
setpoint: 21°C, offset from the input +2°C, final setpoint: 21+2 = 23°C
External temperature setpoint is ignored, when HMI Basic is activated in the system.
Recircul
- mixing chamber control, low voltage input – 0V = 0%,
1V = 100%
ATTENTION!
The level of recirculation is limited by the setting of minimum fresh air
