Viconics VT7600F Installation Guide

VT7600F Series

RTU Terminal Equipment Controller with

Modulating Heat

Installation Guide

For Commercial HVAC Applications

January 30th, 2012 / 028-377-R2

CONTENTS

Installation 2

Location 2
Installation 2

Theory of Operation 3

Features overview 4

Model Chart 5

Network ready 5

Terminal, Identification and Function 6

Screw terminal arrangement and wiring 6

Typical Applications 7

Main outputs wiring 7
Remote sensor accessories 8

Configuring and Status Display Instructions 9

Status display 9

User interface 11

User configuring instructions menu 11
Local keypad interface 11

Discharge Air Control 27
Specifications 28
Drawing & Dimensions 29

1 | PIR Ready VT7600 Series-Installation Guide

INSTALLATION

Remove the security screw on the bottom of

Terminal Equipment Controller cover.

 Open unit by pulling on the bottom

side of Terminal Equipment
Controller (fig. 1).

 Remove wiring terminals from sticker.
 Please read the FCC ID and IC label

installed in the cover upon removal of
cover for the wireless products.

Location

1. Should not be installed on an outside
wall.

2. Must be installed away from any
direct heat source.

3. Should not be installed near an
air discharge grill.

4. Should not be affected by direct
sun radiation.

5. Nothing should restrict vertical
air circulation to the Terminal
Equipment Controller.

Installation

1. Swing open the Terminal
Equipment Controller PCB to
the left by pressing the PCB
locking tabs (fig. 2).

2. Pull out cables 6” out from 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 base in
the proper orientation. Arrow on
base should be facing up.

6. Install anchors in the wall.

7. Insert screws in mounting holes
on each side of the base (fig. 2).

8. Gently swing back the circuit
board on the base and push on
it until the tabs lock it.

9. Strip each wire 1/4 inch from
end.

2 | PIR Ready VT7600 Series-Installation Guide

10. Insert each wire according to wiring diagram.

 When replacing an existing Terminal Equipment Controller, label the

wires before removal of the Terminal Equipment Controller.

 Electronic controls are static sensitive devices. Discharge yourself

properly before manipulating and installing the Terminal Equipment
Controller.

 A short circuit or improper wiring may permanently damage the Terminal

Equipment Controller or the equipment.

 All VT7000 series Terminal Equipment 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 or installer or 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.

11. Gently push excess wiring back into hole (fig. 3).

12. Re-Install wiring terminals in their correct locations (fig. 3).

13. Re-install the cover (top side first) and gently push extra wire length back into
the hole in the wall.

14. Install security screw.

THEORY OF OPERATION

The VT76X6F series uses a Viconics proprietary adaptive logic algorithm to control the
space temperature. This algorithm controls the heating and or air conditioning system to
minimize overshoot while still providing comfort. It provides exceptional accuracy due to
its unique PI time proportioning control algorithm, which virtually eliminates temperature
offset associated with traditional, differential-based on/off thermostats.

Fig.2 - On/Off mechanical control vs. PI electronic control.

3 | PIR Ready VT7600 Series-Installation Guide

Features overview

 7 day schedule models, 2 or 4 events.
 Remote outdoor sensing capability for added flexibility.

- System mode heating and cooling lockout.

-

 Remote discharge air sensor input for monitoring and control purpose.

- System efficiency feedback.

- Discharge high limit heating lockout.

- Discharge low limit cooling lockout.

- Minimum supply air temperature.

 Remote return air sensor input that replaces internal on board sensor.

 Password protected configuration menu and lockable keypads for security.
 Two configurable digital input for added flexibility. The input can be configured as the

following:

 None: No function will be associated with the input.
 Service: a backlit flashing Service alarm will be displayed on the Terminal

Equipment Controller 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.

 Filter: a backlit flashing Filter alarm will be displayed on the Terminal

Equipment Controller LCD screen when the input is energized. It can be tied to a
differential pressure switch that monitors filters.

 RemNSB: remote NSB timer clock input. Will disable the internal scheduling of

the Terminal Equipment Controller. The scheduling will now be set as per the
digital input. The menu part related to scheduling is disabled and no longer
accessible. It provides low cost setback operation via occupancy sensor or from
a dry contact.

 RemOVR: temporary occupancy contact. Disables all override menu function of

the Terminal Equipment Controller. . 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.

 With this function enabled it is now possible to toggle between unoccupied &

occupied setpoints for the amount of time set by parameter (TOccTime)
temporary occupancy time.

 Automatic smart fan operation saves energy during unoccupied periods.
 Non volatile EEPROM memory prevents loss of parameters during power shortage.
 Configurable SPST output relay on scheduling models for lighting, exhaust fan or

fresh air control.

 6 hour typical reserve time for clock in case of power loss.

Easy configuration and self-binding operation

 Easy configuration without using any special software or additional tools.
 Can be used as stand-alone or with BACnet™ MS-TP supervision controller for

monitoring purposed.

 Truly scalable in terms of supported number of zones and RTU units.

4 | PIR Ready VT7600 Series-Installation Guide

MODEL CHART

Network ready

 All Viconics VT7600 series Terminal Equipment Controllers are designed for

stand-alone (Network Ready) operation.

 They can be fully integrated into your choice of automation systems using the

available communication adapter options.

 If required, stand-alone (Network Ready) Terminal Equipment Controllers can be

field retrofitted with the following communication adapters:

o VCM7600N5000B, Terminal Equipment Controller BACnet™ MS-TP®

communication adapter

o VCM7600N5000W Terminal Equipment Controller wireless Zigbee™

communication adapter

5 | PIR Ready VT7600 Series-Installation Guide

TERMINAL, IDENTIFICATION AND FUNCTION

Terminal Use

Terminal

Identification

Description

1 – Y2 2nd cooling

Y2

Second cooling stage output.

2 – Y1 1st cool

Y1

First cooling stage output.

3 – G Fan

G

Fan output.

4 – RC 24VAC hot

RC

Power supply of thermostat, hot side.

5 – C 24VAC com

C

Power supply of thermostat, common side.

9 – AO analog
heat

AO

Analog 0 – 10 VDC heating output.

10 – Auxiliary
output

AUX

Auxiliary output used to disable economizer

minimum position or control lighting during

unoccupied periods.

11 – DI 1

DI 1

Configurable extra digital input. See

parameter section for more information.

12 – DI 2

DI 2

Configurable extra digital input. See

parameter section for more information.

13 – RS

RS

Remote temperature sensor input.

14 - Scom

Scom

Reference input for DI 1, RS, OS & DS.

15 - OS

OS

Outside air temperature sensor input.

16 - DS

MS

Discharge air temperature sensor input.

Aux

DI1

DI2

RS

SCom

OS

MS

G

Y1

Y2 C RC

VT76XXF Controller Terminals

AO

Screw terminal arrangement and wiring

6 | PIR Ready VT7600 Series-Installation Guide

TYPICAL APPLICATIONS

Main outputs wiring

Wiring notes:
Note 1: If the same power source is used for the heating stages, install jumper across RC &

RH. Maximum current is 2.0 amps.

Note 2: If auxiliary output is used to toggle occupancy of the electronic control card inside

the equipment, configure the relay parameter (Aux cont) to the N.O. setting. A
second relay can be added for additional functionality of the occupancy output.

Note 3: The analog outputs and inputs use a half bridge rectifier. Reference of the control

signal is the common of the power supply of the Terminal Equipment Controller.
(Terminal C)

Note 4: Electromechanical contacts are to be used with the digital inputs. Electronic triacs

cannot be used as mean of switching for the input. The switched leg to the input for
the input to activate is terminal C (common)

Note 5: The transformer of the unit provides power to the t Terminal Equipment Controller

and the additional loads that will be wired to the Terminal Equipment Controller.

7 | PIR Ready VT7600 Series-Installation Guide

Remote sensor accessories

Model no.

Description

S2020E1000

Outdoor temperature sensor

S2060A1000

Averaging temperature sensor

S2000D1000

Duct mounted temperature sensor

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

-39

-38

303.6427

-19

-2

89.2521

1 34

30.6120

21

70

11.9177

41

106

5.1373

-38

-36

284.4189

-18 0 84.3147

2 36

29.1197

22

72

11.4018

42

108

4.9373

-37

-35

266.5373

-17 1 79.6808

3 37

27.7088

23

73

10.9112

43

109

4.7460

-36

-33

249.8958

-16 3 75.3299

4 39

26.3744

24

75

10.4443

44

111

4.5631

-35

-31

234.4009

-15 5 71.2430

5 41

25.1119

25

77

10.0000

45

113

4.3881

-34

-29

219.9666

-14 7 67.4028

6 43

23.9172

26

79

9.5754

46

115

4.2208

-33

-27

206.5140

-13 9 63.7928

7 45

22.7861

27

81

9.1711

47

117

4.0607

-32

-26

193.9703

-12

10

60.3980

8 46

21.7151

28

82

8.7860

48

118

3.9074

-31

-24

182.2686

-11

12

57.2044

9 48

20.7004

29

84

8.4190

49

120

3.7607

-30

-22

171.3474

-10

14

54.1988

10

50

19.7390

30

86

8.0694

50

122

3.6202

-29

-20

161.1499

-9

16

51.3692

11

52

18.8277

31

88

7.7360

51

124

3.4857

-28

-18

151.6239

-8

18

48.7042

12

54

17.9636

32

90

7.4182

52

126

3.3568

-27

-17

142.7211

-7

19

46.1933

13

55

17.1440

33

91

7.1150

53

127

3.2333

-26

-15

134.3971

-6

21

43.8268

14

57

16.3665

34

93

6.8259

54

129

3.1150

-25

-13

126.6109

-5

23

41.5956

15

59

15.6286

35

95

6.5499

55

131

3.0016

-24

-11

119.3244

-4

25

39.4921

16

61

14.9280

36

97

6.2866

56

133

2.8928

-23

-9

112.5028

-3

27

37.5056

17

63

14.2629

37

99

6.0351

57

135

2.7886

-22

-8

106.1135

-2

28

35.6316

18

64

13.6310

38

100

5.7950

58

136

2.6886

-21

-6

100.1268

-1

30

33.8622

19

66

13.0307

39

102

5.5657

59

138

2.5926

Fig.10 – Remote Duct Mounted Temperature Sensor

Remote mount temperature sensors use 10K NTC thermistor.

Temperature vs. Resistance Chart for 10 Kohm NTC Thermistor

(R

= 10K±3% - B

25°C

= 3975K±1.5%)

25/85°C

S2000D1000; remote duct mounted temperature sensor c/w junction box.
This sensor can be used for:

 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 sensing.

S2060A1000; remote averaging duct mounted temperature sensor c/w junction

box.

This sensor can be used for:
 Remote averaging return air temperature sensing with the sensor mounted on

the return air duct.

 Outside air temperature averaging sensing with the sensor installed in the

8 | PIR Ready VT7600 Series-Installation Guide

fresh air plenum.

 Supply air temperature averaging sensor for economizer models with the

WIRING S2000D1000, S2060A1000 and S2020E1000

Remote wiring 1 sensor Remote wiring 4 sensors

CLOCK

STATUS

SYSTEM

MODE

SCHEDULE

STATUS

OUTDOOR

TEMPERATURE

ALARMS

Monday

12:00

AM

Sys mode

auto

Occupied

Outdoor

x.x °C or°F

Service

Sys mode

off

Occupied

hold

Frost ON

Sys mode

heat

Unoccup

SetClock

Sys mode

cool

Filter

Fan lock

DAS Alrm

10 K

10 K

10 K

10 K

10 K

Scom

DS

Scom

OS

Scom

RS

or

or

Scom

DS

Scom

OS

Scom

RS

or

or

sensor in the mixing plenum.
S2020E1000; outdoor air temperature sensor
This sensor can be used for:

 Outside air temperature sensing with the sensor installed directly exposed to

the elements.
 Sensor uses a water resistant NEMA 4 ABS enclosure for outdoor

applications.

CONFIGURING AND STATUS DISPLAY INSTRUCTIONS

Status display

The Terminal Equipment Controller features a two-line, eight-character display. There is a low
level backlight that is always active and can only be seen at night.

When left unattended, the Terminal Equipment Controller has an auto scrolling display that
shows the current status of the system.

Each item is scrolled sequentially with the back lighting in low level mode. Pressing any key will
cause the back light to come on to high level.

Manual scrolling of each menu item is achieved by pressing the Yes (scroll) key repetitively.
The last item viewed will be shown on the display for 30 seconds before returning to automatic
scrolling. Temperature is automatically updated when scrolling is held.

Sequence of auto-scroll status display:

9 | PIR Ready VT7600 Series-Installation Guide