Viconics VT7600 Installation Guide

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r

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VT7600 Series

Programmable & Non-Programmable Thermostats

For Commercial HVAC Applications

(Issue Date June 17, 2008 – 028-0132 R8

Product overview

The VT7600 PI thermostat family is specifically designed for single stage
and multi-stage control of heating/cooling equipment such as rooftop and
self-contained units. The product features an intuitive, menu-driven, back-lit
LCD display which walks users through the programming steps, making the
process extremely simple. Accurate temperature control is achieved due to
the product’s PI time proportional control algorithm, which virtually eliminates
temperature offset associated with traditional, differential-based thermostats.

All models contain two digital inputs, which can be set by the user to monitor
filter status, activate a remote temporary occupancy switch, and/or used as
a general purpose service indicator. In addition, depending on the model, up
to three remote sensor inputs are available. All models contain a SPST
auxiliary switch, which can be used to control lighting or disable the
economizer function and a discharge air sensor input. For more advanced
applications, an economizer control logic has been integrated onto the
thermostat for use with proportional damper economizer actuators.

The additional following documentation is available on www.viconics.com

• Information on the LON models (VT76xxX1000E), is available on document ITG-VT7600-LON-Exx

• Information on the BACnet models (VT76xxX1000B), is available on document ITG-VT7600-BAC-Exx

• Information on the Wireless models (VT76xx0X1000W), is available on documents: ITG-VWG-40-BAC-

Exx and LIT-VWG-40-SETUP-Exx

Models available

Model (programmable) VT7652A1000 VT7652B1000 VT7656B1000 VT7652H1000

Model (non-programmable) VT7600A1000 VT7600B1000 VT7605B1000 VT7600H1000

Features and benefits

Application 1 Heat / 1 Cool 2 Heat / 2 Cool

2 Heat / 2 Cool

with economizer

3 Heat / 2 Cool

heat pump

Features Benefits

• PI time proportioning algorithm ⇒ Increased comfort , accuracy, and energy savings

• 2 digital inputs ⇒ Adds functionalit

• Smart fan ⇒ Saves energy during night mode

• Unique configuration key ⇒ Minimizes parameter tampering

• Lockable keypad ⇒ Tamper proof, no need for thermostat guards

• Freeze protection ⇒ Prevents costly freeze damage

• EEPROM memory ⇒ No loss of program

• 6 hour reserve time for clock ⇒ No need to reprogram day/time after power shortage

• Remote room and outdoor temperature senso

• Auxiliary output ⇒ Can be used for lighting and/or economizer override

• Discharge air sensor ⇒ Can be used to monitor unit efficiency

• Intuitive, menu-driven programming (7 day, 2/4 events -

on programmable models only)

• Economizer output (0-10 V d.c.) (on economizer models

⇒ Increase flexibility and functionality

⇒ Can be used for all types of establishments

⇒ Excellent retrofit opportunities

• Low/High balance point (on heat pump models onl

• 3 Heat/2 Cool (on heat pump models only) ⇒ Support single and two stages heat pump with one

⇒ Protect and optimize systems performances

auxiliary heat stage

028-0132R8_LIT-VT7600-E08.doc

www.viconics.com / [e-mail]

Theory of operation

The VT7600 uses a Viconics proprietary adaptive
logic algorithm to control the space temperature. This
algorithm controls the heating / 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.

Features overview

• 7 day programmable models, 2 or 4 events

• Gas/oil or electric system compatibility for all type

of applications

• Remote indoor averaging sensing capability

• Temperature averaging with 2, 3, 4, 9 or 16

sensors

• Remote outdoor sensing capability for added

flexibility

- System mode lock out

- Heat pump balance point settings

• Remote discharge air sensor input for monitoring

purpose

- System efficiency feedback

• Lockable keypads for tamper proofing. No need for

thermostat guards

• Automatic frost protection to prevents costly freeze

damage

• Anti short cycle and minimum on/off run time

protection. Reduces wear and maximizes life span

of mechanical equipment.

• 2 programmable digital inputs for added flexibility.

Each input can be programmed as the following:

- None: No function will be associated with the

input

- 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.

- 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

- Rem NSB: remote NSB timer clock input. Will

disable the internal scheduling of the thermostat.
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 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.

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.

• Programmable smart fan operation saves

energy during night mode

• Non volatile EEPROM memory prevents loss of

parameters during power shortage

• Built in default profile set-up for easier start up

and commissioning

• Configurable SPST output relay on

programmable models for lighting, exhaust fan
or fresh air control

• 6 hour typical reserve time for clock in case of

power loss

• 0 to 10 Vdc economizer output for more retrofit

opportunities

- Built in dry bulb economizer logic using
outdoor temperature sensor

- Input for supply/mixed air temperature sensor

Heat pump model specific features

• Selectable single or dual stage compressor

stages

• High balance point:

Locks out auxiliary heating when outside air
temperature is above this value

• Low balance point:

Locks out heat pump compressor operation
when outside air temperature is below this value

• Comfort/economy mode:

In economy mode, heat pump use is maximized
before turning On auxiliary heating

• Compressor/auxiliary interlock:

Adds flexibility by locking out heat pump
operation during auxiliary heating to prevent high
pressure trip when the coil is downstream of the
auxiliary heat source.

2

Installation

3

• 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)

• Please note the FCC ID and IC label installed in the cover upon

removal of cover for the wireless products.

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 VT7600 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.4

Fig.5

Location of PCB retaining tabs

Re-install terminal blocks

Thermostat assembly

(VT7300F1000 shown)

Fig.6

p

Y2Y

Wiring

4

Terminal identification

Multistage 1H / 1C Heat Pum

Part Number VT7656B VT7605B VT7652B VT7600B VT7652A VT7600A Part Number VT7652H VT7600H

Programmable Yes No Yes No Yes No Programmable Yes No

Top left terminal block Top left terminal block

Y2 X X X X Y2 X X

Y1 X X X X X X Y1 X X

G X X X X X X G X X

RC X X X X X X RC X X

C X X X X X X C X X

Top right terminal block Top right terminal block

RH X X X X X X RH X X

W1 X X X X X X W1 X X

W2 X X X X O/B X X

Bottom terminal block Bottom terminal block

Econo X X

Aux X X X X X X Aux X X

DI1 X X X X X X DI1 X X

DI2 X X X X X X DI2 X X

RS X X X X X X RS X X

Scom X X X X X X Scom X X

OS X X X X X X OS X X

MS X X X X X X MS X X

Screw terminal arrangement

5 pole left top connector

3 pole left top connector

1 G RC C

RH W1

W2

O/B

8 pole bottom connector

EC AU

D1

D2 RS

Scom

OS MS

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

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

Note 3: Economizer output uses a half bridge rectifier. Reference of the control signal is the common of the power supply

Note 4: Electromechanical contacts are to be used with the digital inputs. Electronic triacs cannot be used as mean of

Note 5: The transformer of the unit provides power to the thermostat and the additional loads that will be wired to the

amps.

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

of the thermostat. (terminal C)

switching for the input. The switched leg to the input for the input to activate is terminal C ( common )

thermostat.

A

Detailed wiring diagrams for selected models

VT7656B1000
2 Heat / 2 Cool / Economizer / Programmable

Jumper J1
See note 1
(previous
page)

Y2 Y1

RCG C

W1RH W2

5

Thermostat Terminals -VT7656B1000

RCGY1

C

Scom

RS OS

W2

W1RH

MS

MSScom OS

EC

AU

DI1 DI2 RS

Y2

EC

U DI1 DI2

Digital Input #1

Digital Input #2

Cool

Stage 2

Stage 1

Thermostat internal wiring
System wiring
Jumper J1

Fan

Cool

24 Vac

T1

VT7652H1000
Heat pump / Programmable

Heat

Stage 1

Heat

Stage 2

0-10 Vdc

Com24V

Auxiliary

Output

Remote

Room

Sensor

Remote

Outdoor

Sensor

Field contacts

Thermostat Terminals - VT7652H1000

Y2

Y1 RCG

DI1 DI2AU

C

RH

Scom

OSRS

Remote

Mixed Air

Sensor

W1

MS

O/B

Digital Input #1

Digital Input #2

ScomRS

Remote

Room

Sensor

Field contacts

Remote
Outdoor

Sensor

MSOS

Remote

Mixed Air

Sensor

Y2

Compressor

Stage 2

Y1

Compressor

Stage 1

Thermo stat internal wiring
System wiring
Jumper J1

G

Fan

Jumper J1
See note 1
(previous
page)

RC C RH

24 Vac

T1

W1

Auxiliary

Heat

O/B AU

Reversing

Valve

DI1 DI2

Auxiliary

Output

r

Remote sensor accessories

Model no. Description

S3010W1000 Wall mounted temperature sensor
S3020W1000 Wall mounted temperature sensor with override button and occupancy status LED
S2020E1000 Outdoor temperature sensor
S2060A1000 Averaging temperature sensor
S2000D1000 Duct mounted temperature sensor

Remote mount temperature sensors use 10K NTC thermistors.

• This sensor can be used for:

• 3 thermistors with 2 dip switches are provided with each sensor for various

averaging combinations

• Optional occupancy led

• Optional override key

Wiring example of single remote room sensor:

VT7600 Series
Thermostat

Scom

RS
AU

C

D1

D2

1x S3020W1000
Remote wiring 1 sensor
S2-1 = ON / S2-2 = ON

ScomRSScom

RS

Aux

C

DI

S3010W1000
Remote wiring 1 sensor
S2-1 = ON / S2-2 = ON

OR

ScomRSScom

RS

Fig.8 – S3020W1000
wall mounted sensor

ON

2

1

S2-1 = ON

S2-2 = ON

Dip switch

setting for:

1 senso

6

Wiring examples of 2 remote room sensors for averaging applications:

VT7600 Series
Thermostat

Scom

RS

AU

C

D1

D2

VT7600 Series
Thermostat

Scom

RS
AU

C

D1

D2

2x S3020W1000
Remote wiring 2 sensors
S2-1 = OFF / S2-2 = ON

ScomRSScom

RS

Aux

C

DI

ScomRSScom

RS

Aux

C

DI

1x S3010W1000 and 1x S3020W1000
Remote wiring 2 sensors
S2-1 = OFF / S2-2 = ON

ScomRSScom

RS

Aux

C

DI

ScomRSScom

RS

Notes for averaging applications:

• S3010W1000 and S3020W1000 can be

• S3010W1000 and S3020W1000 are to

• Respect the dip switch setting in each

VT7600 Series
Thermostat

Scom

RS
AU

C

D1

D2

mixed matched.

be wired in parallel.

remote sensor.

Wiring examples of 3 remote room sensors for averaging applications:

VT7600 Series
Thermostat

Scom

RS
AU

C

D1

D2

2x S3010W1000 and 1x S3020W1000
Remote wiring 3 sensors
S2-1 = OFF / S2-2 = OFF

ScomRSScom

RS

Aux

C

DI

ScomRSScom

RS

ScomRSScom

RS

VT7600 Series
Thermostat

Scom

RS
AU

C

D1

D2

1x S3010W1000 and 2x S3020W1000
Remote wiring 3 sensors
S2-1 = OFF / S2-2 = OFF

ScomRSScom

RS

Aux

2x S3010W1000
Remote wiring 2 sensors
S2-1 = OFF / S2-2 = ON

ScomRSScom

RS

ScomRSScom

RS

Dip switch
setting for:

2 sensors

ScomRSScom

RS

Aux

C

DI

C

DI

ScomRSScom

RS

Dip switch

setting for:

3 sensors

ON

2

1

ON

1

S2-1 = OFF

S2-2 = ON

S2-1 = OFF

-

2

=

Temperature vs resistance chart for 10 Kohm NTC thermistor

(R

= 10KΩ±3% - B

25°C

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

= 3975K±1.5%)

25/85°C

S3010W1000 remote wall
mounted temperature
sensor, dip switch location

ON

12

Fig.9 – Sensor dip switch location

Location of dip switch

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 sensor

Fig.10 – Remote duct mounted temperature sensor

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 fresh air plenum.

• Mixed air temperature averaging sensor for economizer models with the 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

WIRING S2000D1000, S2060A1000 and S2020E1000
Remote wiring 1 sensor Remote wiring 4 sensors

Scom

RS

10 K

Scom

or

MS

Scom

or

OS

Scom

RS

ScomMSScom

or

or

10 K

OS

10 K

10 K

(

7

10 K

A

A

User menu flow chart:
NOTE:

MENU

Prompts may not all be present depending on model selected

If status is:
Unoccupied

8

Override
schd Y/N

If status is:
Temporary Occupied Time,

Temperat
set? Y/N

Cooling
set? Y/N

Temperature Temperature Temperature Temperature

Heating
set? Y/N

Sys mode
set? Y/N

off
emergenc
heat
cool
auto

Fan mode
set? Y/N

On
Smart

uto

Unocc CL
set? Y/N

Cancel
ovrd Y/N

Schedule
set? Y/N

Unocc HT
set? Y/N

ppears on stand-alone

models only

Clock
set? Y/N

Time
set? Y/N

Time

°F/°C
set? Y/N

°C
°F

Schedule
hold Y/N

Resume
Occ Hold
Uno Hold

Day
set? Y/N

Day

Exit?
Y/N

Exit
menu Y/ N

12/24hrs
set? Y/N

12 / 24

Exit?
Y/N

Exit?
Y/N

Sunday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Saturday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Friday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Thursday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Wednesda
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Tuesday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Monday
set? Y/N

Occupied
day? Y/N

Occupied
12:00 pm

Time

Unoccup
12:00 pm

Time

Programming and status display instructions

1. Status display

The thermostat features a two-line, eight-character display. There is a low level back-light level that is always active
and can only be seen at night. When left unattended, the thermostat has an auto scrolling display that shows the actual
status of the system. Each item is scrolled one by one with the back lighting off. Pressing any key will cause the back
light to come on.

Sequence of auto-scroll status display:

Room temperature Clock status System mode Schedule status

RoomTemp Monday Sys mode Occupied Outdoor Service
x.x °C or °F 12.00 AM auto x.x °C or°F

Sys mode emergenc

Sys mode
off
Sys mode
heat
Sys mode
cool

Occupied
hold
Unoccup

Unoccup
hold
Override

Manual scroll 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.

Outdoor air temperature display is only enabled when outdoor air temperature sensor is connected.

• A maximum range status display of 50 °C ( 122 °F ) indicates a shorted sensor. Associated functions, such as mode

lockouts and economizer function are automatically disabled.

• A minimum range status -40 °C ( -40 °F ) is not displayed and indicates a opened sensor or a sensor not connected.

Associated functions, such as mode lockouts and economizer function are automatically disabled.

If alarms are detected, they will automatically be displayed at the end of the status display scroll. During an alarm
message display, the back lit screen will light up at the same time as the message and shut off during the rest of the
status display. Two alarms maximum can appear at any given time. The priority for the alarms is as follows:

Frost ON
SetClock
Service
Filter

Indicates that the heating is energized by the low limit frost protection room temperature setpoint 5.6 °C ( 42 °F )
Indicates that the clock needs to be reset. There has been a power failure which has lasted longer than 6 hours
Indicates that there is a service alarm as per one of the programmable digital input ( DI1 or DI2 )
Indicates that the filters are dirty as per one of the programmable digital input ( DI1 or DI2 )

Three status LEDs on the thermostat cover are used to indicate the status of the fan, a call for heat, or a call for cooling.

Multistage and single stage models

• When the fan is on, the FAN LED will illuminate.

• When heating is on, the HEAT LED will illuminate.

• When cooling is on, the COOL LED will illuminate.

Fig.11 - Multistage and single stage models

Heat pump models

• When the fan is on, the FAN LED will illuminate.

• When auxiliary heat is on, the AUX HEAT LED

will illuminate.

• When compressor is on, the HEAT-PUMP LED

will illuminate.

Fig.12 – Heat pump models

Outdoor

temperature

Frost ON

SetClock

Filter

Alarms

9

2. User programming instructions menu

10

The VT7600 series of thermostat feature an intuitive, menu-driven, back-lit LCD display that walks users through the programming
steps, making the programming process extremely simple. This menu is typically accessed by the user to set the parameters such
as temperature and time events, system mode, fan mode, etc.

It is possible to bring up the user menu at any time by depressing the MENU key. The status display automatically resumes after

exiting the user-programming menu.
If the user pauses at any given time during programming, Auto Help text is displayed to help and guide the user through the usage

and programming of the thermostat.

Ex.:

Press yes key to change cooling temperature setpoint
Use the up or down arrow to adjust cooling setpoint

Each of the sections in the menu are accessed and programmed using 5 keys on the thermostat cover.
The priority for the alarms is as follows:

The YES key is used to confirm a selection, to move onto the next menu item and to manually scroll through the
displayed information.

The NO key is used when you do not desire a parameter change, and to advance to the next menu item. Can
also be used to toggle between heating and cooling setpoints.

The MENU key is used to access the Main User Menu or exit the menu.

The down arrow key is used to decrease temperature setpoint and to adjust the desired values when
programming and configuring the thermostat.

The up arrow key is used to increase temperature setpoint and to adjust the desired values when programming
and configuring the thermostat.

When left unattended for 45 seconds, the display will resume automatic status display scrolling.
To turn on the back light, press any key on the front panel. The back lit display will turn off when the thermostat is left unattended for
45 seconds

Sequence of user menu:

Override
Resume

Override
schd Y/N

Appears only in
unoccupied mode

Cancel
ovrd Y/N

Appears only in
override mode

Temperature

setpoints

Temperat

set Y/N

System mode

setting

Sys mode

set Y/N

Fan mode setting Schedules setting Clock setting Schedule hold

Fan mode

set Y/N

Schedule

set Y/N

Clock

set Y/N

Schedule

hold Y/N

Appears only on

stand-alone models

There is a default profile set in the thermostat from the factory.
This enables the thermostat to operate as a non-programmable unit in day mode operation at start up.

Programmed default temperature setpoints:

Occupied cooling setpoint = 24 °C ( 75 °F )

Occupied heating setpoint = 22 °C ( 72 °F )

Programmed default modes:

System mode = Auto

Fan mode = Smart (for models with a communication module or

programmable stand-alone models)

Unoccupied cooling setpoint = 28 °C ( 82 °F )

Unoccupied heating setpoint = 18 °C ( 65 °F )

Fahrenheit scale

Setpoint type = permanent

Fan mode = Auto (for non-programmable stand-alone models)

Programmed default schedules:

Monday through Sunday

Occupied time is: 12 00 AM

Unoccupied time is: 11:59 PM

There will be a 1 minute unoccupied period every night at 11:59 PM with this default configuration.

A) Override an unoccupied period

Override
schd Y/N

11

This menu will appear only when the thermostat is in unoccupied mode. The unoccupied mode is enabled either by the internal timer
scheduling or by a remote NSB contact via DI1 or DI2.
If DI1 or DI2 is configured to operate as a remote temporary override contact, this menu will be disabled.

Answering yes to this prompt will cause the thermostat to go into occupied mode for an amount of time equal to the parameter
“TOccTime” (1 to 12 hours).

B) Resume regular scheduling

Cancel
ovrd Y/N

This menu does not appear in regular operation. It will appear only when the thermostat is in Unoccupied override mode.
Answering “Yes” to this question will cause the thermostat to resume the regular programmed setpoints & scheduling.

C) Temperature setpoints

Permanent setpoint changes

Temperat
set Y/N

This menu permits the adjustment of all permanent temperature setpoints (occupied and unoccupied) as well as the desired
temperature units (°F or °C). Permanent setpoints are written to RAM and EEPROM

Cooling setpoint

Occupied mode

Cooling
set? Y/N

Use ▲▼ keys to set value, Yes key to confirm

Cooling

70.0 °F

No next →
Yes down ↓

Use ▲▼
To set value

Heating setpoint

Occupied mode

Heating
set? Y/N

Heating

68.00 °F

No next →
Yes down ↓

Use ▲▼
To set value

Cooling setpoint

Unoccupied mode

Unocc CL
set? Y/N

Unocc CL

80.0 °F

No next →
Yes down ↓

Use ▲▼
To set value

Heating setpoint

Unoccupied mode

Unocc HT
set? Y/N

Unocc HT

60.0 °F

No next →
Yes down ↓

Use ▲▼
To set value

°F or °C

display setting

°F or °C
set? Y/N

Units
°F

No next →
Yes down ↓

Use ▲▼
To set value

Temporary setpoint changes

Temporary setpoints can be modified through the Up arrow key (

▲) and the Down arrow keys (▼).

User will be prompted with the present mode (Heating or Cooling) of the thermostat and its setpoint.
The Up (
The Down (

▲) arrow key will increment the setpoint by 0.5 degree (F or C).

▼) arrow key will decrement the setpoint by 0.5 degree (F or C).

Press the Yes key to accept the new setpoint.

Local changes to the heating or cooling setpoints made by the user directly using the up or down arrow are temporary.
They will remain effective for the duration specified by ToccTime.
Setpoints will revert back to their default value after internal timer ToccTime expires.
If a permanent change to the setpoints is required, use the

Temperat set ? menu

D) System mode setting

Sys mode
set Y/N

This menu is accessed to set system mode operation

Use ▲▼ to set value, Yes key to confirm

Sys mode
auto

Sys mode
cooling

Sys mode
heating

Sys mode
emergency

Sys mode
off

Automatic mode

Automatic changeover mode between heating and cooling operation

Cooling mode

Cooling operation mode only

Heating mode

Heating operation mode only

Emergency heat mode ( heat pump models only )

Forced auxiliary heat operation mode only

Off mode Normal cooling or heating operation disabled

If enabled in installer parameters, only the automatic heating frost protection at 50 °F ( 10 °C ) is enabled

g

E) Fan mode setting

Fan mode
set Y/N

12

This section of the menu is permits the setting of the fan mode operation.

Use ▲▼ to set value, Yes key to confirm

Fan mode
On

Fan mode
Auto

On fan mode

Fan is on continuously, even when system mode is OFF.

Automatic fan mode

Fan cycles on a call for heating or cooling for both occupied & unoccupied periods.

Smart fan mode

Fan mode
Smart

During occupied periods, fan is on continuously. In unoccupied mode, fan cycles on a call for heating or cooling.
This selection is available on all models with a communication module, on all stand-alone programmable models
or if DI1 or DI2 is set to RemNSB on stand-alone non-programmable models

F) Schedule set (2 events)

Scheduling can have 2 or 4 events per day. This is set in the configuration menu as per parameter (2/4event )

Schedule
set Y/N

This section of the menu permits the user to set the whether 2 or 4 events is needed. Each day can be tailored to specific schedules
if needed.

• 2 events can be programmed per day.

• Occupied & unoccupied periods can be set for each day.

Monday
set? Y/N

Monday timer

Schedule set

No next →
Yes down

Tuesday timer

Schedule set

Tuesday
set? Y/N

↓

No next →
Yes down

↓

Wednesday timer

Schedule set

Wednesda
set? Y/N

No next →
Yes down

↓

Other days are identical

Selects the day to be programmed or
modified

Yes key to access day scheduling, No key to jump to next day

Occupied
Day? Y/N

No next →
Yes down

Occupied
Day? Y/N

↓

No next →
Yes down

Occupied
Day? Y/N

↓

No next →
Yes down

Yes = Daily schedules will be accessed
No = Unoccupied mode all day

↓

Yes key to access day scheduling, No key to jump to next day

Copy Y/N
Previous

Yes next →
No down

↓

Copy Y/N
Previous

Yes next →
No down

↓

Yes = Will copy previous day schedule
No = Daily schedules will be accessed

Yes key to copy previous day, No key to set new time value for each day

Occupied
00:00 AM

Use ▲▼
To set value

Occupied
00:00 AM

Use ▲▼
To set value

Occupied
00:00 AM

Use ▲▼
To set value

Sets Event # 1 Occupied time
Will activate occupied setpoints

Use ▲▼ to set value, Yes key to confirm

Unoccup
00:00 AM

Use ▲▼
To set value

Unoccup
00:00 AM

Use ▲▼
To set value

Unoccup
00:00 AM

Use ▲▼
To set value

Sets Event # 2 Unoccupied time
Will activate unoccupied setpoints

Use ▲▼ to set value, Yes key to confirm

Typical examples of a 2 event office schedule

Ex. #1 Office building closed all weekend

Event Period #1 - Event #1 Period #1 - Event #2
Occupied Unoccupied

Setpoint
Monday

Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Cool Heat Cool Heat

72 °F 70 °F 80 °F 62 °F

7.00 AM 6.00 PM Day time only

7.00 AM 6.00 PM Day time only

7.00 AM 6.00 PM Day time only

7.00 AM 6.00 PM Day time only

7.00 AM 6.00 PM Day time only

12.00 PM * 12.00 PM * Unoccupied

12.00 PM * 12.00 PM * Unoccupied

Note: 12:00 PM = Noon

12:00 AM = Midni

ht

Daily

Occupancy

* Programming consecutive events to the same time will cause the thermostat to choose the last event as the time at which it will set

its schedule. In the above example, the thermostat will control to the unoccupied set point until 7:00 AM Monday.

Ex. #2 Commercial building which is occupied all weekend

Event Period #1 - Event #1 Period #1 - Event #2
Occupied Unoccupied

Setpoint
Monday

Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Cool Heat Cool Heat

72 °F 70 °F 80 °F 62 °F

8.00 AM 5.00 PM Day time only

8.00 AM 5.00 PM Day time only

8.00 AM 5.00 PM Day time only

8.00 AM 5.00 PM Day time only

8.00 AM 5.00 PM Day time only

12.00 AM ** 11.59 PM ** Occupied

12.00 AM ** 11.59 PM ** Occupied

Daily

Occupancy

** To program a day as occupied for 24 hours, set that day Occupied time to 12:00 AM and Unoccupied time to 11:59 PM There will

be a 1 minute unoccupied period every night at 11:59 PM with this schedule configuration.

G) Schedule set (4 events)

Schedule
set Y/N

13

This section of the menu permits the user to set the whether 2 or 4 events is needed. Each day can be tailored to specific schedules if
needed.

• 4 events can be programmed per day.

• Occupied & Unoccupied periods can be set for each day.

• Programming the 3 rd. & 4 th. events to the same time will cancel the last period.

Monday
set? Y/N

Monday timer

Schedule set

No next →
Yes down

Tuesday timer

Schedule set

Tuesday
set? Y/N

↓

No next →
Yes down

↓

Wednesday timer

Schedule set

Wednesda
set? Y/N

No next →
Yes down

↓

Other days are identical

Selects the day to be programmed or
modified

Yes key to access day scheduling, No key to jump to next day

Occupied
Day? Y/N

No next →
Yes down

Occupied
Day? Y/N

↓

No next →
Yes down

Occupied
Day? Y/N

↓

No next →
Yes down

Yes = Daily schedules will be accessed
No = Unoccupied mode all day

↓

Yes key to access day scheduling, No key to jump to next day

Copy Y/N
Previous

Yes next →
No down

↓

Copy Y/N
Previous

Yes next →
No down

↓

Yes = Will copy previous day schedule
No = Daily schedules will be accessed

Yes key to copy previous day, No key to set new time value for each day

Occupied
00:00 AM

Use ▲▼
To set value

Occupied
00:00 AM

Use ▲▼
To set value

Occupied
00:00 AM

Use ▲▼
To set value

Sets Event # 1 Occupied time
Will activate occupied setpoints

Use ▲▼ to set value, Yes key to confirm

Unoccup
00:00 AM

Use ▲▼
To set value

Unoccup
00:00 AM

Use ▲▼
To set value

Unoccup
00:00 AM

Use ▲▼
To set value

Sets Event # 2 Unoccupied time
Will activate unoccupied setpoints

Use ▲▼ to set value, Yes key to confirm

Occupie2
00:00 AM

Use ▲▼
To set value

Occupie2
00:00 AM

Use ▲▼
To set value

Occupie2
00:00 AM

Use ▲▼
To set value

Sets Event # 3 Occupied time
Will activate occupied setpoints

Use ▲▼ to set value, Yes key to confirm

Unoccup2
00:00 AM

Use ▲▼
To set value

Unoccup2
00:00 AM

Use ▲▼
To set value

Unoccup2
00:00 AM

Use ▲▼
To set value

Sets Event # 4 Unoccupied time
Will activate unoccupied setpoints

Use ▲▼ to set value, Yes key to confirm

Ex. #1 Four event retail establishment schedule

Event Period 1 - Event 1 Period 1 - Event 2 Period 2 - Event 3 Period 2 - Event 4
Setpoint Occupied Unoccupied Occupied Unoccupied
Cool Heat Cool Heat Cool Heat Cool Heat

72 °F 70 °F 80 °F 62 °F 72 °F 70 °F 80 °F 62 °F

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

7.00 AM 5.00 PM 12.00 PM * 12.00 PM *

7.00 AM 5.00 PM 12.00 PM * 12.00 PM *

7.00 AM 5.00 PM 12.00 PM * 12.00 PM *

7.00 AM 5.00 PM 7.00 PM 10.30 PM

7.00 AM 5.00 PM 7.00 PM 10.30 PM

12.00 PM * 12.00 PM * 12.00 PM * 12.00 PM *

12.00 PM * 12.00 PM * 12.00 PM * 12.00 PM *

Day/evening time only
Day/evening time only

Daily

Occupancy

Day time only
Day time only
Day time only

Unoccupied
Unoccupied

* Programming events to the same time will cancel the last period and leave the thermostat in unoccupied mode

Ex. #2 Residential

Event Period 1 - Event 1 Period 1 - Event 2 Period 2 - Event 3 Period 2 - Event 4
Setpoint Occupied Unoccupied Occupied Unoccupied
Cool Heat Cool Heat Cool Heat Cool Heat

72 °F 70 °F 80 °F 62 °F 72 °F 70 °F 80 °F 62 °F
Monday 6:00 AM 8:00 AM 4:00 PM 10:00 PM
Tuesday 6:00 AM 8:00 AM 4:00 PM 10:00 PM
Wednesday 6:00 AM 8:00 AM 4:00 PM 10:00 PM
Thursday 6:00 AM 8:00 AM 4:00 PM 10:00 PM
Friday 6:00 AM 8:00 AM 4:00 PM 11:30 PM

Day/evening time only
Day/evening time only
Day/evening time only
Day/evening time only
Day/evening time only

Saturday 8:00 AM * 8:00 AM * 8:00 AM * 11:59 PM *
Sunday 12:00 AM * 12:00 AM * 12:00 AM * 11:59 PM *

Daily

Occupancy

Day time only

Occupied all day

* Programming consecutive events to the same time will cause the thermostat to choose the last event as the time at which it will set its

schedule. In the above example for Saturday, the thermostat will control to the occupied set point from 8:00 AM until 11:59 PM.
Since it is desired to be in occupied mode throughout the night, then it is necessary to program the first event on Sunday at 12:00
AM. The thermostat will force a one minute unoccupied period for a one minute period (between 11:59 PM and 12:00 AM on
Saturday)

H) Clock/Day Settings

Clock
set Y/N

This section of the menu permits the user to set the time and day.

Time setting Day setting Time format setting

Time
set? Y/N

Time
0:00

No next →
Yes down

↓

Use ▲▼
To set value

Day
set? Y/N

Day
Monday

No next →
Yes down

↓

Use ▲▼
To set value

12/24hrs
set? Y/N

12/24hrs
12 hrs

J) Schedule hold

Schedule
hold Y/N

This menu

• This menu will only appear on stand-alone thermostat, e.i. without a BACnet / Echelon module.

• This section of the menu permits the user to set a permanent schedule hold, which bypasses the internal thermostat

scheduling.

• The permanent schedule hold function is typically used for non-scheduled events that extend for various periods of

time.

• Enabling a permanent occupied or permanent unoccupied schedule hold will cancel any active override.

• The use of temporary setpoints during permanent hold is permitted. The duration of the temporary setpoint is as set

per the TOccTime parameter. Ex. 3 hours

Use ▲▼ to set value, Yes key to confirm

Schedule
resume

Resume regular scheduling cancels the permanent hold and re-enables the regular

programming as set per internal scheduling or as per remote NSB via one of the DI’s
configured as remote NSB.

This action can also by accomplished by using the Resume menu.

Any temporary setpoint that are active will be left active for the duration of the period as set

Schedule
occ hold

per the TOccTime parameter.

Hold permanent occupied forces the thermostat into a permanent occupied mode using the

occupied setpoints. All timed scheduling functions are by-passed.

The PERMANENT OCCUPIED status will appear in the automatic status scroll. To resume

to regular scheduling, user must scroll to the Schedule Hold menu and select the Schedule
resume option..

Schedule
uno hold

Hold permanent unoccupied forces the thermostat into a permanent unoccupied mode

using the unoccupied setpoints. All timed scheduling functions are by-passed.

The PERMANENT UNOCCUPIED status will appear in the automatic status scroll. To
resume to regular scheduling, user must scroll to the Schedule Hold menu and select the
Schedule resume option..

No = exit
Yes down
Use ▲▼
To set value

↓

14

Installer configuration parameter menu

Configuration can be done through the network or locally at the thermostat.

• To enter configuration, press and hold the middle button (Menu) for 8 seconds

• Press the same middle button repetitively to scroll between all the available parameters

• Use the up and down key to change the parameter to the desired value.

• To acknowledge and save the new value, press the middle button again.

• The next listed parameter is now displayed

Configuration

parameters

DI 1

Significance

Default value

Digital input no.1 configuration

Open contact input = function not
energized

Closed contact input = function energized

Default value = None

15

Adjustments

None, No function will be associated with the input
Rem NSB, remote NSB timer clock input. Will disable

the internal scheduling of the thermostat. The
scheduling will now be set as per the digital input. The
time is still displayed as information, but the menu part
related to scheduling is disabled and no longer
accessible.

Open contact = occupied setpoints

Closed contacts = unoccupied setpoints

RemOVR Temporary override remote contact.

Disables all override menu function of 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. 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. When Override is enabled,
an Override status message will be displayed

DI 2

lockout

pwr del

Level

0
1
2

Filter, a back-lit flashing Filter alarm will be displayed

on the thermostat LCD screen when the input is
energized

Service, a back-lit flashing Service alarm will be

displayed on the thermostat LCD screen when the
input is energized

Digital input no. 2 configuration

Default value = None

Keypad lockout levels

Default value = 0 No lock

Resume/
Override

scheduling

Resume

sched Y/N

Yes access Yes access Yes access Yes access Yes access Yes access Yes access Yes access
Yes access No access Yes access No access No access No access Yes access No access

No access No access No access No access No access No access Yes access No access

Permanent

Occupied

and

Unoccupied

Setpoints

RoomTemp

set Y/N

Temporary

setpoints

using

arrows

Up key (▲)

Down key (▼)

Power-up delay

Default value = 10 seconds

Same as above. It is possible to configure both inputs
to have the same function.

0 = No lock
1 = Low level
2 = High level

System

mode setting

Sys mode

set Y/N

Fan mode

setting

Fan mode

set Y/N

Schedules

setting

Schedule
set Y/N

Clock

setting

Clock

set Y/N

On initial power up of the thermostat ( each time 24
Vac power supply is removed & re-applied ) there is a
delay before any operation is authorized ( fan, cooling

Permanent

hold

Schedule
hold Y/N

or heating ). This can be used to sequence start up
multiple units / thermostat in one location.

10 to 120 seconds

Frost pr

Frost protection enabled

Default value = Off
On heat pump models the system

mode will be forced to EMERGENCY
mode if frost protection is activated

heat max Maximum heating setpoint limit

Default value = 90 °F ( 32 °C )

cool min Minimum cooling setpoint limit

Default value = 54 °F ( 12 °C )

Anticycle Minimum on/off operation time for

stages

Default value = 2 minutes

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.

Heat cph Heating stages cycles per hour

Default value = 4 C.P.H.
For multi stage models, heat cph
applies to W1 & W2
For heat pump models, heat cph
applies to W1 only
(Emergency heat )

cool cph Cooling stages cycles per hour

Default value = 4 C.P.H.
For multi stage models, cool cph
applies to Y1 & Y2
For heat pump models, cool cph
applies to Y1 & Y2 in cooling and
heating independently of the
reversing valve position

Deadband Minimum deadband

Default value = 2.0 °F ( 1.1 °C )

fan cont Fan control

Default value = On
For multi stage models, fan control

applies to W1 & W2
For heat pump models, fan control
applies to W1 only (Emergency
heat)

Off: no room frost protection
On: room frost protection enabled in all system

mode at: 42 °F ( 5.6 °C )

Frost protection is enabled even in system Off

mode

Off or On

Maximum occupied & unoccupied heating setpoint
adjustment. Heating setpoint range is:

40 to 90 °F ( 4.5 to 32.0 °C )

Minimum occupied & unoccupied cooling setpoint
adjustment. Cooling setpoint range is:

54 to 100 °F ( 12.0 to 37.5 °C )

Minimum On/Off operation time of cooling &
heating stages.

IMPORTANT, anti-short cycling can be set to 0
minutes for equipment that posses their own anti
cycling timer. Do not

use this value unless the
equipment is equipped with such internal timer.
Failure to do so can damage the equipment.

0, 1, 2, 3, 4 & 5 minutes

Will set the maximum number of heating stage
cycles per hour under normal control operation. It
represents the maximum number of cycles that
the equipment will turn ON and OFF in one hour.
Note that a higher C.P.H will represent a higher
accuracy of control at the expense of wearing
mechanical components faster.

3, 4, 5, 6,7 & 8 C.P.H.

Will set the maximum number of cooling stage
cycles per hour under normal control operation. It
represents the maximum number of cycles that
the equipment will turned on and off in one hour.
Note that a higher C.P.H will represent a higher
accuracy of control at the expense of wearing
mechanical components faster.

3 or 4 C.P.H.

Minimum deadband value between the heating
and cooling setpoints. If modified, it will be applied
only when any of the setpoints are modified.

2, 3 or 4 °F ( 1.0 to 2.0 °C )

Fan control in heating mode.

When selecting On; the thermostat in all cases

will always control the fan (terminal G).
Valid for On or Auto fan mode

When selecting Off; the fan ( terminal G ), when

heating stages ( terminals W1 & W2 ) are
solicited, will not be energized. The fan in this
case will be controlled by the equipment fan limit
control.
Valid only for Auto fan mode. On fan mode will
leave the fan always on.

On or Off

16

fan del Fan delay

Default value = Off

Com Addr

Thermostat networking address

Default value = 4
Range is: 0 to 254

• For BACnet MS-TP models valid

range to use is from 1 to 127

• For wireless models valid range is 0

to 254 with a maximum of 30
thermostat per VGG

ToccTime Temporary occupancy time

Default value = 3 hours

cal RS Room air temperature sensor calibration

Default value = 0.0 °F or °C

cal OS Outside air temperature sensor

calibration

Default value = 0.0 °F or °C

H stage Number of heating stages. Applicable to

2 stage models only

Default value = 2 stages

For heat pump models, H stage is
limited to 1 stage only (W1 – Aux.
Heat)

C stage

Or

HP stage

Number of cooling stages
2 stages model only

Default value = 2 stages

For heat pump models, HP stage
selects the number of compressor
stages

H lock Outside air temperature heating lockout

Default value = 120 °F ( 49 °C )

C lock Outside air temperature mechanical

cooling lockout.

Default value = -40 °F ( -40 °C )

17

Fan delay extends fan operation by 60 seconds
after the call for heating or cooling ends.
Valid only for Auto fan mode. “On” fan mode will
leave the fan always on.

Off or On
Conditional parameter to BACnet MS-TP models

(VT76xxX1000B)
Conditional parameter to Wireless models
(VT76xxX1000W)

This parameter will only appear when a BACnet or
wireless network adapter is present. If the
thermostat is installed as a stand-alone unit or with
an Echelon adapter, this parameter will not be used
or displayed

Temporary occupancy time with occupied mode
setpoints when override function is enabled
When the thermostat is in unoccupied mode,
function is enabled with either the menu or DI1 or
DI2 configured as remote override input.

0,1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 & 12 hours

Offset that can be added/subtracted to actual
displayed room temperature

± 5.0 °F ( ± 2.5 °C )

Offset that can be added/subtracted to actual
displayed outside air temperature

± 5.0 °F ( ± 2.5 °C )

Will revert the operation of 2 stages thermostat to
single stage operation only when the second
heating step is not needed.

1 or 2 stages

Will revert the operation of 2 stage thermostat to
single stage operation only when the second
cooling step is not needed.

1 or 2 stages

Disables heating stage operation based on outdoor
air temperature.
Function will only be enabled if OS ( outside air
temperature sensor ) is connected.

From -15 °F up to 120 °F ( -26 °C up to 49 °C )

Disables cooling stage operation based on outdoor
air temperature.
On economizer model, free cooling will not be
disabled by this function.
Function will only be enabled if OS ( outside air
temperature sensor ) is connected.

From -40 °F up to 95 °F ( -40 °C up to 35 °C )

18

2/4event Number of events configuration

Default value = 2 event

2 events, will set up programming for the following

Event 1 is for Occupied setpoints
Event 2 is for Unoccupied setpoints

4 events, will set up programming for the following

Event 1 is for Occupied setpoints
Event 2 is for Unoccupied setpoints
Event 3 is for Occupied setpoints
Event 4 is for Unoccupied setpoints

aux cont Auxiliary contact configuration

Default value = N.O. normally open

This contact can be used to energize peripheral
devices such as: lighting equipment, exhaust fans,
economizers, etc.
This contact will operate in parallel with the internal
occupied/unoccupied schedule of the thermostat or
the remote NSB contact if DI1 or DI2 is used.

When the system is in OFF mode, the contact will

remain in its unoccupied status independently of the
occupied / unoccupied schedule.

Configured

N.O. Closed Opened
N.C. opened Closed
Prog rec Progressive recovery enabled

Default value = Off

Progressive recovery is automatically
disabled if DI 1 and / or DI 2 are
configured remote NSB

Off, = no progressive recovery

The programmed occupied schedule time is the
time at which the system will restart.

On, = progressive recovery active.

The programmed occupied schedule time is the

Contact

occupied

status

Contact

unoccupied

status

time at which the desired occupied temperature will
be attained. The thermostat will automatically
optimize the equipment start time.

In any case, the latest a system will restart is 10
minutes prior to the occupied period time.

Heat Pump models only

high bp High balance point

Default value = 90 °F ( 32.0 °C )

Function will only be enabled if OS
(outside air temperature sensor) is
connected.

low bp Low balance point

Default value = -12 °F ( -24 °C )

Function will only be enabled if OS
(outside air temperature sensor) is
connected.

In Heating or Auto mode, it is the outside air

temperature value at which the auxiliary heat will be
cut off. Above that value, only the heat pump will be
used to maintain the heating setpoint

34 to 90 °F ( 1.0 to 32.0 °C )
In Heating, Cooling or Auto mode, it is the outside

air temperature value at which the heat pump
operation will be cut off. Below that value, only the
auxiliary heat will be used to maintain the heating
setpoint

-40 to 30 °F ( -40 to -1.0 °C )

19

Comf/eco

Comfort or economy mode

Default value = Comfort

Sets the operation and interaction mode of the heat
pump with the auxiliary heat.

Comfort mode. In Heating mode.

If the heat pump is not able to satisfy the heating
setpoint, the auxiliary heat will be energized to

satisfy the same heating setpoint.
Economy mode. In Heating mode.

If the heat pump is not able to satisfy the heating
setpoint, the auxiliary heat will be energized to
satisfy only when the temperature has dropped 2.0
°F ( 1.1 °C ) below the heating setpoint. Selecting
economy mode will add a deadband between the
heatpump & auxiliary heat in heating mode. The
actual temperature maintained will be lower than the
true heating setpoint to maximize the heat pump
operation.
When the outdoor air temperature drops below the

low balance point, the deadband will be eliminated

and the auxiliary heat will maintain the true heating
setpoint alone.

Economy mode. In Emergency mode.
If Emergency heat mode is selected, the setpoint
maintained, will be the heating setpoint.

re valve Reversing valve operation O/B

Default value = O

Heat pump reversing valve operation

O will energize the valve in cooling operation.
B will energize the valve in heating operation
O or B

comp/aux Compressor/auxiliary interlock

Default value = Off

Sets the operation and interaction mode of the heat
pump with the auxiliary heat.

Interlock Off. In Heating mode.

If the heat pump is not able to satisfy the heating
setpoint, the auxiliary heat will be energized at the
same time as the heat pump stage. Typically applies
when the air handler heat pump coil is installed
before the auxiliary heat. ( all electric systems )

Interlock On. In Heating mode.

If the heat pump is not able to satisfy the heating
setpoint, the auxiliary heat will be energized and the
heat pump will be cut off. Typically applies when the
air handler heat pump coil is installed after the
auxiliary heat. ( add on systems ) There is a 2
minute delay to restart the heat pump, when the
auxiliary heat is shut down

Off or On

Notes for Heat Pump models:

When the outside air sensor is not connected or is shorted, the thermostat bypasses:

• The heating lockout

• The cooling lockout

• The low balance point

• The high balance point

Heat Pump model when set in Emergency mode bypasses heating lockout and permits auxiliary heating whenever
a heating demand occurs.

Chngstpt Changeover setpoint

Default value = 55 °F ( 13.0 °C )

min pos Minimum position

Default value = 0%

Outside air
percentage

Setting for 0-10
Vdc Autuator

Setting for 2-10
Vdc Autuator

C mech Mechanical cooling allowed

0% 5%

0% 5%

0 to

20%

24%

Default value = Off

Economizer Model only

10% 15% 20% 25% 30%

10% 15% 20% 25% 30%

28% 32% 36% 40% 44%

20

In Cooling mode.

The outside air temperature value at which the
cooling will be switched over from mechanical (
compressor ) to free cooling ( economizer )

14 to 70 °F ( -10.0 to 21.0 °C )

Outside air damper minimum position.
Will be active only when fan is on ( G terminal )
and the internal or remote scheduling is in
occupied mode.
When internal or remote scheduling is in
unoccupied mode and/or fan is off, minimum
position will be set to 0%

0 to 100 % = 0 to 10 Vdc output range
In Cooling mode.

Allows the operation of the mechanical cooling if
the free cooling ( economizer ) cannot maintain the
cooling setpoint.

Off Typically applies when the MS ( mixed air

temperature sensor ) is installed after the
mechanical cooling refrigeration coils. In this case,
mechanical cooling will never operate at the same
time as free cooling.

mix stpt Mixed air setpoint

Default value = 55 °F ( 13.0 °C )

MS dis Display mixed air temperature

Economizer model only, only if sensor
is installed

On Typically applies when the MS ( mixed air

temperature sensor ) is installed before the
mechanical cooling refrigeration coils in the mixing
plenum. In this case, mechanical cooling is
allowed when the free cooling ( economizer
operation ) cannot maintain the cooling setpoint.

Off or On

Free cooling mixed air setpoint when economizer
mode is enabled.

50 to 90 °F ( 10.0 to 32.0 °C )

Used as diagnostic / service help to troubleshoot
and diagnose economizer operation.

PAN ID

Personal Area Network
Identification

Default value = 0

Range is: 0 to 500

Wireless Model only

Conditional parameter to Wireless models
(VT76xxX1000W)

This parameter will only appear when a wireless
network adapter is present. If the thermostat is
installed as a stand-alone unit or with a BACnet or
Echelon adapter, this parameter will not be used or
displayed

This parameter (Personal Area Network Identification)
is used to link specific thermostats to a single specific
Viconics wireless gateway ( VWG ) For every
thermostat reporting to a gateway ( maximum of 30

thermostats per gateway ), be sure you set the SAME

PAN ID value both at the gateway and the
thermostat(s).

The default value of 0 is NOT a valid PAN ID. The valid

range of available PAN ID is from 1 to 500

21

Channel

Get From

Channel selection

Default value = 10
Range is: 10 to 26

Thermostat Get From another
device configuration utility

Default value = 0

Range is: 0 to 254

Conditional parameter to Wireless models
(VT76xxX1000W)

This parameter will only appear when a wireless
network adapter is present. If the thermostat is
installed as a stand-alone unit or with a BACnet or
Echelon adapter, this parameter will not be used or
displayed

This parameter (Channel) is used to link specific
thermostats to specific Viconics wireless gateway(s) (
VWG ) For every thermostat reporting to a gateway (
maximum of 30 thermostats per gateway ), be sure

you set the SAME channel value both at the gateway

and the thermostat(s).

Viconics recommends using only the 2 last
channels ( 25-2575MHz and 26-2580MHz )

The default value of 10 is NOT a valid channel. The

valid range of available channel is from 11 to 26

Conditional parameter to Wireless models
(VT76xxX1000W)

This parameter / function is not currently supported by the
wireless thermostats.

Troubleshooting guide

All models

Symptom Possible Cause Corrective Action

No display on the
thermostat

Absent or incorrect supply
voltage

Overloaded power
transformer

1. Check power supply voltage between C & RC to be
from 19-30 Vac

2. Check for tripped fuse or circuit breaker

Verify that the transformer used is powerful enough
(enough VA’s) to supply all controlled devices
including the thermostat

22

Keyboard menu does
not access all functions

Temperature setpoints
revert to original value
after a certain time
period

Thermostat will not call
for heating

Thermostat will not call
for cooling

Keyboard locked Change configuration parameter LOCKOUT to value

“0” to access all levels of the menu

Temporary setpoint option
selected

1. The thermostat needs to be in Permanent setpoint
mode for the new setpoint to be kept and memory
and used all the time

2. Go to the Set temperature menu.

3. The last prompt is setpoint type. Set it to
Permanent setpoint

Wrong mode selected Select heating mode
Thermostat in Unoccupied
mode

Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied heating setpoint

Anticycle delay active Wait, the anticycling period will end and the

equipment will start
Heating setpoint is satisfied Raise the Heating setpoint
Heating lockout attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter H Lock to value
120 °F ( 49 °C ) to by-pass lockout

Wiring error 1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RH & W1. The
heating should come ON. If it does not, verify
wiring and check if a jumper is required between
RC & RH

Wrong mode selected Select cooling mode
Thermostat in Unoccupied
mode

Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied cooling setpoint

Anticycle delay active Wait, the anticycling period will end and the

equipment will start
Cooling setpoint is satisfied Lower the cooling setpoint
Cooling lockout attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter C Lock to value ­40 °F ( -40 °C ) to by-pass lockout

Wiring error 1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RC & Y1. The
cooling should come ON. If it does not, verify wiring

turn on the fan

Digital display shows
missing digits or erratic
segments

Wrong mode selected The thermostat will not
Wiring error

1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RC & G. The fan
should come ON. If it does not, verify wiring

Defective display Replace thermostat

Troubleshooting guide

Heatpump models

Auxiliary heat does not
operate

Wrong mode selected Select emergency heat mode
Thermostat in Unoccupied
mode

Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied heating setpoint

Anticycle delay active Wait, the anticycling period will end and the

equipment will start
Heating setpoint is satisfied Raise the Heating setpoint
High Balance point attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter High BP to value
90 °F ( 32 °C ) to by-pass lockout

Heating lockout attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter H Lock to value
120 °F ( 49 °C ) to by-pass lockout

Wiring error 1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RH & W1. The
heating should come ON. If it does not, verify
wiring and check if a jumper is required between
RC & RH

23

Heat pump does not
operate in heating
mode

Wrong mode selected Select heating mode

Thermostat in Unoccupied
mode

Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied heating setpoint

Anticycle delay active Wait, the anticycling period will end and the

equipment will start
Heating setpoint is satisfied Raise the Heating setpoint
Low Balance point attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter Low BP to value ­12 °F ( -24 °C ) to by-pass lockout

Heating lockout attained 1. Mode is locked out based on outside air

temperature

2. Change configuration parameter H Lock to value
120 °F ( 49 °C ) to by-pass lockout

Wiring error 1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RH & W1. The
heating should come ON. If it does not, verify
wiring and check if a jumper is required between
RC & RH

Wrong reversing valve
configuration

1. Wrong selection of parameter Re Valve

2. Select O will energize the valve in cooling
operation. Valve is normally heat.

3. Select B will energize the valve in heating
operation. Valve is normally cool.

Specifications

24

Thermostat power requirements: 19-30 Vac 50 or 60 Hz; 2 VA ( RC & C ) Class 2

RC to RH jumper 2.0 Amps 48 VA maximum

Operating conditions: 0 °C to 50 °C ( 32 °F to 122 °F )

0% to 95% R.H. non-condensing

Storage conditions: -30 °C to 50 °C ( -22 °F to 122 °F )

0% to 95% R.H. non-condensing

Sensor: Local 10 K NTC thermistor

Resolution: ± 0.1 °C ( ± 0.2 °F )

Control accuracy: ± 0.5 ° C ( ± 0.9 °F ) @ 21 °C ( 70 °F ) typical calibrated

Occupied and unoccupied setpoint range

12.0 to 37.5 °C ( 54 to 100 °F )

cooling:

Occupied and unoccupied setpoint range

4.5 °C to 32 °C ( 40 °F to 90 °F )

heating:

Room and outdoor air temperature range -40 °C to 50 °C ( -40 °F to 122 °F )

Proportional band for room temperature control: Both outputs: 1.1°C ( 2.0°F )

Digital inputs: Relay dry contact only across C terminal to DI1 or DI2

Contact output rating: Each relay output: ( Y1, Y2, G, W1, W2 & AU )

30 Vac, 1 Amp. maximum
30 Vac, 3 Amp. in-rush

Economizer analog output rating:

0 to 10 Vdc into 2KΩ resistance min.

Economizer analog output accuracy: ± 3% typical

Wire gauge 18 gauge maximum, 22 gauge recommended

Dimensions: 4.94” x 3.38” x 1.13”

Approximate shipping weight: 0.75 lb ( 0.34 kg )

Agency Approvals all models:

Agency Approvals Stand-Alone, BACnet & LON

models

Agency Approvals Wireless models

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO
CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT

ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

Drawing & dimensions

Fig.13 – Thermostat dimensions

UL: UL 873 (US) and CSA C22.2 No. 24 (Canada), File E27734

with CCN XAPX (US) and XAPX7 (Canada)

Industry Canada: ICES-003 (Canada)
FCC: Compliant to CFR 47, Part 15, Subpart B, Class A (US)

CE: EMC Directive 89/336/EEC (Europe Union)
C-Tick: AS/NZS CISPR 22 Compliant (Australia / New Zealand)

Supplier Code Number N10696

FCC: Compliant to: Part 15, Subpart C

Important notice

All VT7600
series
controls are

for use as
operating controls only and
are not safety devices. These
instruments have undergone
rigorous tests and verifications
prior to shipment 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
alarm system to protect the
entire system against such
catastrophic failures.
Tampering of the devices or
miss application of the device
will void warranty.