Viconics VT7225 series User manual

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Features
•0 to 10 VDC modulating output
•VDC pulsed modulating output
•VAC pulsed modulating output
•Night setback digital input
•Room or supply control applications
Description
The VT7225 series controllers are microcomputer-based, proportional and
integral (PI) devices with one analog 0 to 10 Vdc output, one 8 Vdc and one 24
Vac proportioning pulsed output.
The analog 0 to 10 Vdc modulating output can control the room or supply
temperature by modulating directly a 0 to 10 Vdc SCR power controller.
The Vdc and Vac pulsed outputs can control the room or supply temperature by
modulating directly 4-32 Vdc triggered solid state relays (SSR’s) using a time
proportioning control algorithm on a 1 second time cycle.
VT7225 Series
Installation Guide
For Modulating Electric Heat Applications
November 2017

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CONTENTS
Installation 3
Location 3
Installation 3
BI 1 5
UI 3 5
Terminal Identification and Function 5
Output Types 6
Wiring 7
Remote sensor accessories 11

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INSTALLATION
Remove security screw on bottom of Room
Controller cover.
▪Open unit by pulling on bottom side of
Room Controller (fig. 1).
▪Remove wiring terminals from sticker.
▪Read FCC ID and IC label installed in
the cover.
Location
1. Do not install on outside wall.
2. Do not install in areas exposed to direct
heat source.
3. Do not install near an air discharge
grill.
4. Do not install in areas exposed to
direct sunlight
5. Do not install in areas that restrict
vertical air circulation to Room
Controller.
Installation
1. Swing open Room Controller PCB to
left by pressing PCB locking tabs (fig.
2).
2. Pull out cables 6” out from the wall.
Ensure wall surface is flat and clean.
3. Insert cable in central hole of base.
4. Align base and mark location of two
mounting holes on wall. Install proper
side of base up.
5. Install anchors in wall.
6. Insert screws in mounting holes on
each side of base (fig. 2).
7. Gently swing back circuit board on
base and push until the tabs lock.
8. Strip each wire 1/4 inch from end.
9. Insert each wire according to wiring
diagram.
10. Gently push excess wiring back into
hole (fig. 3).
11. Re-Install wiring terminals in their
correct locations (fig. 3).
12. Re-install cover (top side first) and
gently push extra wire length back into
hole in wall.
13. Install security screw.

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▪If replacing an existing Room Controller, label the wires before removal
of the Room Controller.
▪Electronic controls are static sensitive devices. Discharge yourself
properly before manipulating and installing the Room Controller.
▪A short circuit or wrong wiring may permanently damage the Room
Controller or the equipment.
▪All VT7000 series Room Controllers are designed for use as operating
controls only and are not safety devices. These instruments have
undergone rigorous tests and verification prior to shipping to ensure
proper and reliable operation in the field. Whenever a control failure
could lead to personal injury and/or loss of property, it becomes the
responsibility of the user / installer / electrical system designer to
incorporate safety devices (such as relays, flow switch, thermal
protections, etc) and/or an alarm system to protect the entire system
against such catastrophic failures. Tampering with the devices or
unintended application of the devices will result in a void of warranty.

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BI 1
Binary input #1 function:
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
UI 3
Supply air sensor: Used for supply air temperature control.
TERMINAL IDENTIFICATION AND FUNCTION
Pin Number
Pin Identification
Description
4
24 V ~ HOT
Power 24 Vac
5
24 V ~ COM
Common
6
Do not use
7
AUX
24 Vac pulsed output
9
AO 2
0 to 10 Vdc analog output
10
AO 1
8 Vdc pulsed output
12
BI 1
Night setback input
13
RS
Remote sensor
14
S COM
Sensor common
16
UI 3
Supply sensor

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Output Types
Type of Output
Controlled Device
Modulating analog 0 to 10 Vdc output
SCR’s power controls
Vdc pulsed output
4-32 Vdc triggered SSR’s
Vac pulsed output
24 Vac triggered SSR’s

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Wiring
24V 0to10
Vdc
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
Supply temperature control with 0 to 10Vdc SCR and override input
By closing contact on BI 1, will force setpoint to
« Unocc HT » adjustable inside setup parameters.
By adjusting to a low setpoint (ex: 0°F) is a way to
disable heating. By adjusting to 180°F, is a way to
force maximum heating.
If parameter « MenuScro » = On, will display
« Unoccup » when contact closed and
« Occupied » when contact open.
24V 0to10
Vdc
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
Return temperature control with 0 to 10Vdc SCR

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24V SSR
+
-Up to 4x
4-32Vdc SSR
(see wiring detail)
Room temperature control with 4-32Vdc SSR
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
Wiring detail for 4x 4-32 Vdc SSR
24V SSR
+
-Up to 4x
4-32Vdc SSR
(see wiring detail)
Room temperature control with 4-32Vdc SSR
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
Wiring detail for 4x 4-32 Vdc SSR

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24V SSR
+
-
Room remote temperature control with 4-32Vdc SSR
24V~
COM
AUX
AO2
AO1
BI1
S
COM
UI3
24V~
HOT
RS
1x, 2x or 3x remote sensors for averaging room temperature
reading (see S3010W1000 manual for proper settings)

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24V SSR
Up to 10x 24Vac SSR in parallel
(or add C24 adapter board to regular 3-32Vdc SSR)
Room temperature control with 24 Vac SSR
Wiring details
24V~
COM
AUX
AO2
AO1
BI1
UI3
24V~
HOT
RS
S
COM
24V~
COM
AUX
AO2
AO1
BI1
UI3
24V~
HOT
RS
S
COM
Up to 10x
24Vac SSR
(see wiring detail)

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Remote sensor accessories
Model
Description
Application
Picture
S1010E1000
Capsule type sensor for
multipurpose use, ¼” dia. capsule
with
65 inch leads
•Remote sensing easy
to dissimulate for
indoor and outdoor
use
•Water temperature
sensing strapped on
pipe or in an
immersion well
S3010W1000
Room sensor
•Remote room
sensing
•3 thermistors with 2
dip switches are
provided with each
sensor for various
averaging
combinations
S2000D1000
Duct sensor with junction box
•Remote return air
temperature sensing
with the sensor
mounted on the return
air duct.
•Outside air
temperature sensing
with the sensor
installed in the fresh
air plenum.
•Supply air
temperature sensor
S1010D1000
Duct Mounted Change Over
Sensor
•Supply duct
temperature sensor
•Return duct
temperature sensor
•Mounting: Through
hole in duct, with
eyelet

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Wall mounted sensor
Temperature vs. resistance chart for 10 Kohm Type II NTC thermistor
(R25°C = 10K±3%, B25/85°C = 3975K±1.5%)
ºC
ºF
Kohm
ºC
ºF
Kohm
ºC
ºF
Kohm
ºC
ºF
Kohm
ºC
ºF
Kohm
-40
-40
324.3197
-20
-4
94.5149
0
32
32.1910
20
68
12.4601
40
104
5.3467
-35
-31
234.4009
-15
5
71.2430
5
41
25.1119
25
77
10.0000
45
113
4.3881
-30
-22
171.3474
-10
14
54.1988
10
50
19.7390
30
86
8.0694
50
122
3.6202
-25
-13
126.6109
-5
23
41.5956
15
59
15.6286
35
95
6.5499
55
131
3.0016
Specifications
Operating Conditions
•0°C to 50°C (32°F to 122°F)
•0% to 95% R.H. non-condensing
Sensor
Local on board NTC Thermistor
Resolution
± 0.1°C (± 0.2°F)
Control Accuracy
± 0.2°C (± 0.4°F) calibrated
Control Ranges
-17°C to 82°C (0°F to 180°F)
Proportional band for room temperature
control
1.8°C (3.2°F)
Proportional band for supply temperature
control
28°C (50°F)
Analog 0 to 10 Vdc output
•0 to 10 Vdc into 2Kohm resistance min.
•5 mA max at 10 Vdc
Vdc pulsed output
20 mA max at 8 Vdc
Power
24 Vac -15%, +10% 50/60 Hz; 2 Va
Viconics Technologies Inc.
Tel.: Fax: Toll free:
www.viconics.com