Viconics VT7300 Installation Guide
VT7300 Series
24 Vac Low Voltage Fan Coil Thermostats
Product overview
For Commercial and Lodging HVAC Applications
(Issue Date: August 10, 2007 – 028-0125 R6)
The VT7300 PI thermostat family is specifically designed for fan coil control. The product
features a backlit LCD display with dedicated function menu buttons for simple operation.
Accurate temperature control is achieved due to the product’s PI proportional control
algorithm, which virtually eliminates temperature offset associated with traditional,
differential-based thermostats.
Models are available for On/Off, 3 point floating and analog 0 to 10 Vdc control.
All models contain can control three, two or single fan speed. 3 additional inputs are also
provided for various functions.
All models feature configurable System and Fan button functions to meet all possible
applications. They all contain an SPST auxiliary switch that can be used to control lighting
or auxiliary reheat.
The additional following documentation is available on www.viconics.com
• Information on the LON models (VT73xxX1000E), is available on document ITG-VT7300-LON-Exx
• Information on the BACnet models (VT73xxX1000B), is available on document ITG-VT7300-BAC-Exx
Models available
Viconics
number
VT7300A1000
2 & 4
Application
RH sensor
Market Commercial / Institution Hotels / Lodging
Pipe
On/Off
No No Yes No No Yes No Yes No Yes
VT7300C1000
2 & 4 Pipe
Floating & On/Off
VT7350C1000
VT7305A1000
2 & 4
Pipe
On/Off
VT7305C1000
2 & 4 Pipe
Floating & On/Off
VT7355C1000
Commercial /
VT7300F1000
Institution
VT7350F1000
2 & 4 Pipe
Analog 0-10 Vdc
VT7305F1000
Hotels / Lodging
Features and benefits
Features Benefits
• Models available with internal humidity sensing ⇒ Increased occupant comfort through dehumidification
• Advanced occupancy functions ⇒ Through the network or smart local occupancy sensing
• 3 configurable inputs ⇒ Adds functionality
• Configurable sequences of operation ⇒ Single model meets more applications
• Configurable fan functions button ⇒ Meets more applications with a single model
• Unique configuration setup utility ⇒ Minimizes parameter tampering
• Multi level lockable keypad ⇒ Tamper proof, no need for thermostat guards
• Auto Fan speed mode ⇒ Increased occupant comfort in cooling mode by reducing
humidity and offer less fan noise in all mode of operation
• Available for 24 Vac On/Off, Floating or Analog control ⇒ Meet advanced applications requirements
• Auxiliary output ⇒ Can be used for lighting or reheat
www.viconics.com
sales@viconics.com
VT7355F1000
Programmable BI/UI inputs overview
Binary input #1 can be configured for the following
functions:
1. (None): No function will be associated with the
input
2. (Rem NSB): remote NSB timer clock input. The
scheduling will now be set as per the binary input.
It provides low cost setback operation via a dry
contact
• Contact opened = Occupied
• Contact closed = Unoccupied
3. (Motion NO): remote NSB using a motion detector.
The occupancy will now be set as per the binary
input. Contact opened = Unoccupied. When the
contact closes momentarily, the thermostat goes
into occupied mode for the time specified by the
ToccTime timer. The timer can reset at the end of
its cycle if new movements are detected in the
area.
4. (Motion NC): remote NSB using a motion detector.
The occupancy will now be set as per the binary
input. Contact closed = Unoccupied. When the
contact opens momentarily, the thermostat goes
into occupied mode for the time specified by the
ToccTime timer. The timer can reset at the end of
its cycle if new movements are detected in the
area.
5. (Window) EMS: Forces the system to disable any
current heating or cooling action by the thermostat.
The mode stays the same and the current setpoints
are the same Occupied setpoints. Only the outputs
are disabled. There is a Door/Window alarm
displayed on the thermostat to indicate to the local
tenant that the door/window needs to be closed for
cooling or heating to resume. Use NC contact.
• Contact opened = System disabled with local
Window alarm
• Contact closed = System enabled
Binary input #2 can be configured for the following
functions:
1. (None): No function will be associated with the
input
2. (Door Dry) Door contact & Motion detector:
This configuration is only functional if binary input
#1 is set to Motion NO or Motion NC.
BI1 is connected to a motion detector & BI2 is
connected to a door contact switch. With this
sequence enabled, the occupancy is now dictated
through those 2 inputs. Any motion detected will
set the zone to occupied status. The zone will
remain permanently in occupied mode until the
door contact switch opens momentarily. The
thermostat will then go in unoccupied mode. If
more movements are detected, the occupied mode
will resume. If the door stays open more than the
time value specified by the doortime parameter,
the zone will remain unoccupied. Use NC contact.
• Contact opened = Door opened
• Contact closed = Door closed
2
3. (RemOVR): temporary occupancy remote override
contact. This function disables the central button
override function on the thermostat. The override
function is now controlled by a manual remote
momentarily closed contact. When configured in
this mode, the input operates in a toggle mode.
It is now possible to toggle between unoccupied &
occupied setpoints for the amount of time set by
parameter (TOccTime) temporary occupancy time.
4. (Filter): a backlit flashing Filter alarm will be
displayed on the thermostat LCD screen when the
input is energized. It can be tied to a differential
pressure switch that monitor filters
• Contact opened = No alarm
• Contact closed = Alarm displayed
5. (Service): a backlit flashing Service alarm will be
displayed on the thermostat LCD screen when the
input is energized. It can be tied in to the AC unit
control card, which provides an alarm in case of
malfunction.
• Contact opened = No alarm
• Contact closed = Alarm displayed
Universal input #3 can be configured for the
following functions:
1. (None): No function will be associated with the
input
2. (COC/NH) Change over dry contact. Normally
Heat: Used for hot / cold water change over
switching in 2 pipe systems.
• Contact closed = Cold water present
• Contact opened = Hot water present
Only used and valid if system is setup as 2 pipes.
Parameter ( Pipe No ) set as 2 pipes.
3. (COC/NC) Change over dry contact. Normally
Cool: Used for hot / cold water or air change over
switching in 2 pipe systems.
• Contact closed = Hot water present
• Contact opened = Cold water present
Only used and valid if system is setup as 2 pipes.
Parameter ( Pipe No ) set as 2 pipes.
4. (COS) Change over analog sensor: Used for hot
/ cold water or air change over switching in 2 pipe
systems.
Only used and valid if system is setup as 2 pipes.
Parameter ( Pipe No ) set as 2 pipes.
• If water temperature is > 77 °F = Hot water present
• If water temperature is < 75 °F = Cold water present
5. (SS) Supply air sensor monitoring: Used for
supply air temperature monitoring.
Only used for network reporting of the supply air
temperature. Has no internal function in the
thermostat.
.
Installation
• Remove security screw on the bottom of thermostat cover.
• Open up by pulling on the bottom side of thermostat.
• Remove Assembly and remove wiring terminals from sticker. (Fig. 3)
A) Location:
1- Should not
be installed on an outside wall.
2- Must be installed away from any heat source.
3- Should not be installed near an air discharge grill.
4- Should not be affected by direct sun radiation.
5- Nothing must restrain vertical air circulation to the thermostat.
B) Installation:
1- Swing open the thermostat PCB to the left by pressing the PCB
locking tabs. (Fig. 4)
2- Pull out cables 6” out of the wall.
3- Wall surface must be flat and clean.
4- Insert cable in the central hole of the base.
5- Align the base and mark the location of the two mounting holes
on the wall. Install proper side of base up.
6- Install anchors in the wall.
7- Insert screws in mounting holes on each side of the base.
(Fig. 4)
8- Gently swing back the circuit board on the base and push on it
until the tabs lock it.
10- Strip each wire 1/4 inch.
11- Insert each wire according to wiring diagram.
13- Gently push back into hole excess wring (Fig. 5)
14- Re-Install wiring terminals in correct location. (Fig. 5)
15- Reinstall the cover (top side first) and gently push back extra
wire length into the hole in the wall.
16- Install security screw.
• If replacing an old thermostat, label the wires before
removal of the old thermostat.
• Electronic controls are static sensitive devices.
Discharge yourself properly before manipulation and
installing the thermostat.
• Short circuit or wrong wiring may permanently damage
the thermostat or the equipment.
• Anti-short cycling can be set to 0 minutes for equipment
that posses their own anti cycling timer. Do not use that
value unless the equipment is equipped with such
internal timer. Failure to do so can damage the
equipment.
• All VT7000 series thermostats are to be used only as
operating controls. Whenever a control failure could
lead to personal injury and/or loss of property, it
becomes the responsibility of the user to add safety
devices and/or alarm system to protect against such
catastrophic failures.
Fig.3
Fig.5
3
Location of PCB retaining tabs
Fig.4
Re-install terminal blocks
Thermostat assembly
(VT7300F1000 shown)
Fig.6
Terminal identification
Vi con i cs num ber VT73xxA10x x VT73xxC10x x Vi con i cs num ber VT73xxF10xx
Description / application 2 & 4 Pipe On/Off 2 & 4 Pipe Floating Description / application 2 & 4 Pipe Analog
2 & 4 Pip e On/ O ff
4
Internal temperature X X Internal temperature X
Internal humidity
1- High Fan Speed
2- Medium Fan S pe ed
3- Low Fa n S pee d
4- 24 V~ Hot
5- 24 V~ Com
6- Aux BO 5
7- Aux BO 5
8- BO 3 Open Heat
9- BO 4 Close He at
10- BO 1 Ope n Coo l
11- BO 2 Close Cool
12- BI #1
13- RS
14- Scom
15- BI #2
16- UI #3 COS / COC / S S
Fan-H Fan-H
Fan-M Fan-M
Fan-L Fan-L
24 V~ Hot 24 V~ Hot
24 V~ Com 24 V~ Com
BO 5-Aux BO 5-Aux
BO 5-Aux BO 5-Aux
BO 3 BO 3
BO 2 BO 2
BI 1 BI 1
RS RS
Scom Scom
BI 2 BI 2
UI 3 UI 3
Model dependent
BO 4
BO 1
Intern al humi d i ty
1- High Fan Spe ed
2- Medium Fan Spee d
3- Low Fan Spe e d
4- 24 V~ Hot
5- 24 V~ Com
6- Aux BO 5
7- Aux BO 5
9- AO 2 Heat
10- AO 1 Co o l
Not use d Blank
12- BI #1
13- RS
14- Sco m
15- BI #2
16- UI #3 COS / COC /SS
Model dependent
Fan-H
Fan-M
Fan-L
24 V~ Hot
24 V~ Com
BO 5-Aux
BO 5-Aux
AO 2
AO 1
Blank
BI 1
RS
Scom
BI 2
UI 3
Wiring
Power & Fan ( All models )
24 V~ transformer relay pack
3 speed 2 speed Single speed
Fan-H
Fan-M
Fan-L
High
Med
Low
High
Low
High
24 V~ Hot
24 V~ Com
Remote inputs ( All models )
BI 1
RS
Scom
Remote wall sensor
- S3010W1000
- S3020W1000
BI 2
UI 3
Contact
- Door
- Remote Override
- Filter alarm
- service alarm
Contact
- Rem NSB
- Motion
- Window
SS ( supply sensor )
- S1010E1000
- S2000D1000
COS ( changeover sensor )
- S1010E1000
OR
COC/NH
- Normally heat
- Closed contact = cold water
COC/NC
- Normally cool
- Closed contact = heat water
Auxiliary output ( All models )
- Dry contact to end device 24 V~ maximum
#4 24 V~ Hot
#5 24 V~ Com
#6
#7
- 24 Vac power to relay
#4 24 V~ Hot
#5 24 V~ Com
#6
#7
R
R
A
2
2
A
A
Main outputs wiring
VT7300A1000 & VT7305AC1000
24 V~ Hot
24 V~ Com
BO2
VT7300C1000, VT7305C1000, VT7350C1000 & VT7355C1000
24 V~ Hot
24 V~ Com
BO1
BO2
VT7300C1000, VT7305C1000, VT7350C1000 & VT7355C1000
24 V~ Hot
24 V~ Com
BO1
BO2
2 Pipe applications 4 Pipe applications
On-Off control
24 V~ Hot
24 V~ Com
24 Vac
N.C. Heating / Cooling valve
24 Vac
24 Vac
Com
Com
BO3
BO2
24 Vac
Com
Com
24 Vac
24 Vac
Com
Com
24 V~ Hot
24 V~ Com
BO3
if N.O.
OR
if N.C.
if N.O.
if N.C.
OR
OR
OR
if N.O.
if N.C.
OR
Heating / Cooling valve
24 Vac
Com
BO4
BO1
BO2
Floating control
24 V~ Hot
24 V~ Com
BO3
Heating / Cooling valve
Open
Com
Close
BO4
BO1
BO2
Open
Com
Close
Open
Com
Close
N.O. Heating valve
N.C. Cooling valve
24 Vac
24 Vac
Com
Com
24 Vac
24 Vac
Com
Com
Heating valve
Heating valve
Cooling valve
Cooling valve
Heating valve
Cooling valve
5
Analog control
VT7300F1000, VT7305F1000, VT7350F1000 & VT7355F1000
24 V~ Hot
24 V~ Com
Heating / Cooling valve
Com
24 Vac
O 1
0-10 Vdc
4 V~ Hot
4 V~ Com
O 2
O 1
Com
24 Vac
0-10 Vdc
Com
24 Vac
0-10 Vdc
Heating valve
Cooling valve
Typical applications
Schematic Wiring Settings
2 pipe system cooling and/or heating ( VT7300A1000, VT7300C1000 & VT7305C1000 ) On / Off N.C. actuator
Normally Closed On/Off
Valve Cooling and/or Heating
3 Speed fan
Room Temperature
Fan-H
Fan-M
Fan-L
UI3 COS
24 V~ Com
24 V~ Hot
BO2 N.C.
24 Vac f an relays
High
Med
Low
Control Thermostat
Mandatory
• Pipe no = 2 pipes
• CntrltTyp = On/Off
• Fan Menu = 0 (L-M-H)
• FL time = as per actuator
If cooling only set::
• SeqOpera = 0 Cooling only
If heating only set::
• SeqOpera = 1 Heating only
If heat / cool auto-changeover
with a local water temperature
sensor set:
Optional supply water
temper at ure sensor
• SeqOpera = 0 Cooling only
• UI3 = COS
2 pipe system cooling and/or heating ( VT7300C1000 & VT7305C1000 ) Floating actuato r
Modulating Floating
Valve Cooling and/or Heating
3 Speed fan
Room Temperature
Control Thermostat
Fan-H
Fan-M
Fan-L
UI3 COS
24 V~ Com
24 V~ Hot
BO1 Open
BO2 Close
24 Vac f an relays
High
Med
Low
Mandatory
• Pipe no = 2 pipes
• CntrltTyp = Floating
• Fan Menu = 0 (L-M-H)
• FL time = as per actuator
If cooling only set::
• SeqOpera = 0 Cooling only
If heating only set::
• SeqOpera = 1 Heating only
If heat / cool auto-changeover
with a local water temperature
sensor set:
Optional supply water
temper at ure sensor
• SeqOpera = 0 Cooling only
• UI3 = COS
2 pipe system cooling and/or heating ( VT7300F1000 & VT7305F1000 ) Analog actuator
Modulating Analog
Valve Cooling and/or Heating
3 Speed fan
Room Temperature
Fan-H
Fan-M
Fan-L
UI3 COS
0 V~ Com
24 V~ Hot
AO1
24 Vac f an relays
High
Med
Low
Control Thermostat
0 to 10
Vdc
Mandatory
• Pipe no = 2 pipes
• Fan Menu = 0 (L-M-H)
• RA/DA = as per actuator
If cooling only set::
• SeqOpera = 0 Cooling only
If heating only set::
• SeqOpera = 1 Heating only
If heat / cool auto-changeover
with a local water temperature
sensor set:
• SeqOpera = 0 Cooling only
Optional supply water
temper at ure sensor
• UI3 = COS
6
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