Viconics VT8300 Series, Application Manual

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Viconics Technologies Inc. www.viconics.com sales@viconics.com
028-0444-06 November 2018
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VT8350
BO1-C
lose Ht Vlv
e
BO2 - F
an L
BO3 - F
an M
BO4 - F
an H
R
C (24 V
ac)
C (Common)
RH
BO8 - A
ux Hea
t
UO9
- Close Cool V
UO10
- ECM 0-10 Vdc
UO11
- Open Cool V
UO12
- Open Hea
t V
B
A
Cnet +
B
A
Cnet -
B
A
Cnet REF
UI 16 UI 17 Common UI 19 UI 20 - RS Common UI22 - SS
Floating C ECM Fan
(OPTIONAL)
ECM Fan
HEATING VALVE
Close Open Com.
COOLING VALVE
Close Open Com.
COMM ON
24 VAC
FAN START
FCU Low-voltage
TERMINAL BLOCK
(-)
(+)
Sequence of Operation and Wiring
Occupied Mode
Setpoints revert to those defined by occupied cooling and heating.
Stand-by Mode (only available when PIR motion detector sensor is used)
Setpoints revert to those defined by stand-by cooling and heating.
Unoccupied Mode
Setpoints revert to those defined by unoccupied heating and cooling.
Occupied Override Mode
System reverts to occupied mode for duration determined by “ToccTime” parameter.
On Call for Cool
Cooling valve opens to maintain room temperature. Heating valve closes.
On Call for Heat
Heating valve opens to maintain room temperature. Cooling valve closes.
On Demand for Dehumidification
Dehumidification is achieved via cooling coil using heating coil for reheat if necessary.
Dehumidification is only allowed in COOL mode, or if cooling is enabled in AUTO mode.
Dehumidification is disabled if room temperature falls below low ambient lockout temperature, which is the cooling setpoint minus the
configuration defined deadband value.
Reheat disabled if cooling demand reaches 100%.