Viconics VT7607 User Manual

VT7600 Series

Programmable & Non-Programmable Thermostats

With Humidification & Dehumidification Strategy

For Commercial HVAC Applications

(Issue Date June 12, 2008 – 028-0171 R5

Product overview

The VT76x7 PI thermostat family is specifically designed for single stage
and multi-stage control of heating/cooling equipment such as rooftop and
self-contained units with humidifier and/or dehumidifier. The product features
an embedded complete humidity solution with an intuitive, menu-driven,
backlit LCD display that walks users through the programming steps, making
the process extremely simple. Accurate temperature & relative humidity
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 one digital input, 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. The two models contain a SPST
auxiliary switch, which can be used to control lighting or disable the
economizer function and a discharge air sensor input.

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

• Information on the LON models (VT76x7B1000E), is available on document ITG-VT76x7-LON-Exx

• Information on the BACnet models (VT76x7B1000B), is available on document ITG-VT76x7-BAC-Exx

• Information on the Wireless models (VT76x7B1000W), is available on documents: ITG-VWG-40-

Fig.1 - VT76x7 thermostat

BAC-Exx and LIT-VWG-40-SETUP-Exx

Models Avalable

Ordering Information Notes:
(X) model number represents available communication options: X = none for Stand-alone,

Features and benefits

X = B for BACnet MS-TP, X = E for Echelon and X = W for Wireless

Application 2 Heat / 2 Cool

Model (programmable) VT7657B1000(X)

Model (non-programmable) VT7607B1000(X)

Features Benefits

• Embedded humidification sequence (0-10 Vdc output)

and dehumidification sequence (dry contact)

• Internal RH sensor embedded ⇒ Eliminates components

• Proportional high limit override ⇒ Prevents costly damage due to over-humidification

• Humidity setpoint reset based on outdoor temperature ⇒ Saves energy and prevents window condensation in

• RH sensor failure protection ⇒ Prevents humidity water damage

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

• 1 digital input ⇒ Adds functionality

• 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 outdoor temperature sensor ⇒ Increase flexibility and functionality

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

• Discharge air humidity sensor ( 0-10 Vdc input ) ⇒ Can be used to limit supply RH levels

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

on programmable models only)

⇒ Simplifies installation and reduce installation costs

colder climates

⇒ Can be used for all types of establishments

028-0174 R5_LIT-VT76x7-E05.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 overshoots 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

• Internal RH sensor and remote RH input with

humidification and dehumidification sequence of
operation embedded

• Remote outdoor sensing capability for added

flexibility

- System mode lock out

- Humidity setpoint reset

• High limit input to prevent over-humidification

• 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.

• Programmable digital input for added flexibility. The

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 humidification output

- Built in proportional humidity controller

- Proportional humidity high limit when used
with the analog input for supply humidity

- Automatic humidity setpoint reset when
outside air temperature value is used.

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)

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

Fig.4

Fig.6

Re-install terminal blocks

Thermostat assembly

(VT7300C1000 shown)

Wiring
Terminal identification & screw terminal arrangement

Part Number VT7657B1000(X) VT7607B1000(X)

Programmable Yes No

Top left terminal block

Y2 X X

Y1 X X

G X X

RC X X

C X X

Top right terminal block

RH X X

W1 X X

W2 X X

Bottom terminal block

HUM X X

AUX X X

DEHUM X X

DI X X

HS X X

SCOM X X

OS X X

HL X X

5 pole left top connector

Y2

HUM

AUX

3 pole left top connector

C

RCGY1

8 pole bottom connector

DE
HUM

DI

S

HS OS

COM

W2

W1RH

HL

Detailed wiring diagrams for selected models

VT76X7B1000
2 Heat / 2 Cool / Humidifier & Dehumidifier Outputs / Programmable & Non-Programmable

Jumper J1

Y2 Y1

See note 1
(previous
page)

RCG C

W1RH W2

HUM AU

DeHum

Digital Input

DI HS

Scom

OS

HL

4

Cool

Stage 2

Cool

Stage 1

Thermostat internal wiring
System wiring
Jumper J1

Fan

24 Vac

T1

Heat

Stage 1

Heat

Stage 2

0-10 Vdc

Com24V

Auxiliary

Output

Dehum

Output

0-10 Vdc
Remote
Humidity

Sensor

Field contact

Remote
Outdoor

Sensor

0-10 Vdc

High Limit

Humidity

Sensor

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

the thermostat. (terminal C)

Note 4: Electromechanical contact are to be used with the digital input. 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 thermostat and the additional loads that will be wired to the

thermostat.

Remote humidity sensor accessories

Model no. Description

VH2020W1000 Wall mounted humidity sensor
VH2020D10000 Duct mounted humidity sensor

VH2020W1000, remote wall mounted room humidity sensor.
This sensor can be used for:

• Remote return or room air humidity sensing with the

sensor mounted on the wall.

Fig.7– VH2020W1000
Remote wall mounted sensor

VH2020D1000, remote duct mounted humidity sensor c/w

junction box.

This sensor can be used for:

• Remote return air humidity sensing with the sensor

mounted on the return air duct.

• Supply air humidity sensor used as a high limit

protection.

5

Wiring example of remote room humidity sensor:

VT76x7 Series
Thermostat

C

RC

HL

OS

Scom

HS

DI

24 Vac Power
To Thermostat

VH2020W1000
Remote wiring

1

Common

2

Power

0-10 Vdc

4

Fig.9 – VH2020D1000
Remote duct mounted humidity sensor

Wiring example of duct humidity sensor:

VT76x7 Series
Thermostat

C

RC

HL

OS

Scom

HS

DI

Valid for both hight limit sensor (HL) or
main remote humidity sensor (HS) connections

24 Vac Power
To Thermostat

VH2020D1000
Remote wiring

1

Common

2

Power

0-10 Vdc

4

User menu flow chart:
NOTE:

Prompts may not all be present depending on model selected

MENU

If statu s is:
Unoccupied

6

Overr i de
schd Y/ N

If statu s is:
Temporary Occupied Time,
Occupied hold or

Resume
schd Y/ N

Unoccupied hold

Temperat
set ? Y/ N

Humi d i t y
set ? Y/ N

Sys mode
set ? Y/ N

Off
Heat
Cool

Fan mode
set ? Y/ N

On
Smart
Auto

Auto

Dehumi di
set ? Y/ N

Humi d i f i
set ? Y/ N

Exi t ?
Y/ N

RH% RH%

Cooling
set ? Y/ N

Heat i ng
set ? Y/ N

Unocc CL
set ? Y/ N

Unocc HT
set ? Y/ N

Temperature Temperature Temperature Temperature

Schedul e
set ? Y/ N

°F/°C
set ? Y/ N

°C
°F

Cl o c k
set ? Y/ N

Ti me
set ? Y/ N

Time

Exi t ?
Y/ N

Schedul e
hol d Y/ N

Resume
Occ Hold
Uno Hold

Da y
set ? Y/ N

Day

On stand-alone
models only

Exi t ?
Y/ N

12/ 24hrs
set ? Y/ N

12 / 24

Exi t ?
Y/ N

Exi t ?
Y/ N

Sunday
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

Sat u r day
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

Fr i day
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

Thur sday
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

We dnesda
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

Tuesday
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
12: 00 pm

Time

Unoccup
12: 00 pm

Time

Monday
set ? Y/ N

Occupi ed
day? Y/ N

Occupi ed
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 backlit 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 backlighting off. Pressing any key will cause the backlit to come on.

Sequence of auto-scroll status display:

Room Temp &

Humidity

x.x °C or °F Monday Sys mode Occupied Outdoor Service
xx % RH 12.00 AM auto x.x °C or°F

If humidity display is
enabled

RoomTemp
x.x °C or °F

If humidity display is not
enabled

Sys mode emergenc

Clock status System mode Schedule status

Sys mode
off
Sys mode
heat

Sys mode
cool

Occupied
hold
Unoccup

Unoccup
hold
Override

Outdoor

temperature

Frost ON

SetClock

Filter

Alarms

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 or a network value is
received.

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

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 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 backlit 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.

• 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.10 – VT7657 and VT7607 cover

7

2. User programming instructions menu

The VT7600 series of thermostat feature an intuitive, menu-driven, backlit 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.:

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:

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

Sequence of user menu:

Override
schd Y/N

Appears only in
unoccupied mode

Cancel
ovrd Y/N

Appears only in
override mode

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 and humidity setpoints:

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

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

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

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

Dehumidification setpoint = 70% RH

Humidification setpoint = 50% RH

Fahrenheit scale

Setpoint type = permanent

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

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

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.

Override

Resume

Temperature

setpoints

Temperat

set Y/N

Humidity

setpoints

Humidity

set Y/N

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

Schedule hold

Schedule

hold Y/N

Appears only on

stand-alone models

Programmed default modes:

System mode = Auto

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

programmable stand-alone models)

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

Unoccupied time is: 11:59 PM

8

A) Override an unoccupied period

Override
schd Y/N

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 DI.
If DI 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

Temporary setpoint changes

No next →
Yes down ↓

Use ▲▼
To set value

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 (
Press the Yes key to accept the new setpoint.

▲) 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).

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

D) Humidity setpoints

Humidity
set Y/N

This menu permits the adjustment of humidification and dehumidification setpoints.

Dehumidification

setpoint

Dehumidi
set? Y/N

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

Dehumidi
70 %

No next →
Yes down ↓

Use ▲▼
To set value

To prevent overlap, a minimum fixed deadband of 5% RH will always prevail between the humidification and dehumidification
setpoints. For example, if the humidification setpoint is 50% RH and the dehumidification setpoint is changed from 70% RH to
45% RH, the humidification setpoint will be modified to 45% RH by the thermostat.

Humidification process

Humidification process will only be allowed when the thermostat is in heating mode (System Mode = Heat or System Mode =
Auto and effective mode at the thermostat is heat). If there is a humidification demand and the fan is OFF, the fan is first turned
ON and the humidifier output is then activated.
Other than having the RH setpoint, the following events can stop the humidification process at any time: RH sensor is out of
range, System Mode is switched to Off or Cool and the System Mode = Auto but the room’s effective mode changes from Heat
to Cool

Heating setpoint

Occupied mode

Heating
set? Y/N

Heating

68.00 °F

No next →
Yes down ↓

Use ▲▼
To set value

Humidification

setpoint

Humidifi
set? Y/N

Humidifi
50 %

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

Temperat set ? menu

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

9

Dehumidification process

10

If (Dhu LCK) Dehumidification Lockout Functions is set to On (Enabled):

Dehumidification process will only be allowed when the thermostat is in cooling mode (System Mode = Cool or System Mode =
Auto and effective mode at the thermostat is cool). If there is a dehumidification demand and the fan is OFF, the fan is first
turned ON and the dehumidification output is then activated.

Other than having reach the dehumidification setpoint, the following events can stop the dehumidification process at any time:

• RH sensor is out of range

• System Mode is switched to Off, Heat or System Mode = Auto and effective mode at the thermostat is Heat

• The room temp drops below the cooling setpoint minus the deadband value

• The Outside air temp is below the Dhu OALK parameter

If (Dhu LCK) Dehumidification Lockout Functions is set to Off (Disabled):

Other than having reach the dehumidification setpoint, the following events can stop the dehumidification process at any time:

• RH sensor is out of range

• System Mode is switched to Off

• The Outside air temp is below the Dhu OALK parameter

Dehumidification process is allowed when the thermostat operates in all system mode except Off. If there is a dehumidification
demand. If the fan is OFF, the fan is first turned ON and the dehumidification output is then activated.

There is NO active temperature lockout protection in this mode. If the dehumidification process causes the room temperature to
rise or fall, the thermostat will react by either activating the cooling or heating outputs based on it’s current system mode
settings.

E) 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
off

F) Fan mode setting

Fan mode
set Y/N

Automatic mode

Automatic changeover mode between heating and cooling operation

Cooling mode

Cooling operation mode only

Heating mode

Heating 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

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

Fan mode
Smart

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

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

G) 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 = Midnight

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

** 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.

Daily

Occupancy

11

H) Schedule set (4 events)

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.

• 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
set? Y/N

Tuesday timer

Schedule set

No next →
Yes down ↓

Wednesday timer

Schedule set

Wednesda
set? Y/N

No next →
Yes down ↓

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 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 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

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

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

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

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 *

* 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
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 *

* 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).

Other days are identical

Selects the day to be programmed or
modified

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

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

Sets Event # 1 Occupied time
Will activate occupied setpoints

Sets Event # 2 Unoccupied time
Will activate unoccupied setpoints

Sets Event # 3 Occupied time
Will activate occupied setpoints

Sets Event # 4 Unoccupied time
Will activate unoccupied setpoints

Daily

Occupancy

Day time only
Day time only

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

Unoccupied
Unoccupied

Daily

Occupancy

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

Day time only

Occupied all day

12

I) 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

13

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

%RH disp

DI

Significance

Default value

Local RH Display

Default value = Off

Digital input no.1 configuration

14

Adjustments

Enables the display of humidity below the room
temperature on the display

On = Display %RH
Off = No display of %RH

None, No function will be associated with the input

Open contact input = function not
energized

Closed contact input = function
energized

Default value = None

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

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

Lockout

Pwr del

Level

0
1
2

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
Yes access No access Yes access No Access No access No access No access Yes access No access

No access No access No access No Access No access No access No access Yes access No access

Permanent

Occupied and

Unoccupied

Setpoints

Temperat

set Y/N

Temporary

setpoints

using arrows

Up key (▲)

Down key (▼)

Humidity

Setpoints

Humidity

set Y/N

Power-up delay

Default value = 10 seconds

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

Permanent

hold

Schedule
hold 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 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.

Cool cph Cooling stages cycles per hour

Default value = 4 C.P.H.

Deadband Minimum deadband

Default value = 2.0 °F ( 1.1 °C )

Fan cont Fan control

Default value = On

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

15

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

C stage Number of cooling stages

2 stages model only

Default value = 2 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 )

2/4event Number of events configuration

Default value = 2 event

For scheduling model only ­VT7657B1000B

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

(VT76x7B1000B)
Conditional parameter to Wireless models
(VT76x7B1000W)

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 )
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

16

Aux cont

Auxiliary contact configuration

Default value = N.O. normally open

Prog rec Progressive recovery enabled

Default value = Off

Progressive recovery is automatically
disabled if DI is configured as Remote
NSB

For scheduling model only ­VT7657B1000B

RH LT

Reset RH lower outside temperature
setpoint

Default value = -20°F (-29°C)

RH HT Reset RH higher outside temperature

setpoint

Default value = 32°F (0°C)

HL Sp RH High limit setpoint

Default value = 85% RH

Dhu OALK Dehumidification outside air

temperature lockout

Default value = 32°F (0°C)

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 DI is used.

When the system is in OFF mode, the contact will

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

Configured

Contact

occupied

status

Contact unoccupied

status

N.O. Closed Opened

N.C. opened Closed

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
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.

Minimum outside air temperature for RH setpoint
reset.
Only valid if an outdoor air sensor is connected at
the thermostat or a network value is transmitted to

the thermostat. See RH HT & RE Sp.
From –40°F up to 15°F (-40°C to –9.5°C)

Maximum outdoor air temperature for RH setpoint
reset.
Only valid if an outdoor air sensor is connected at
the thermostat or a network value is transmitted to

the thermostat. See RH LT & RE Sp
From 20°F up to 55°F (-6.5°C to 13°C)

High humidity limit in the supply.
Only valid if a 0-10 Vdc sensor is connected at the
thermostat – otherwise this feature is disabled
automatically.

From 50% RH up to 90% RH

Outside air temperature under which the
dehumidification sequence is disabled.
Only valid if an outdoor air sensor is connected at
the thermostat or a network value is transmitted to
the thermostat.

From –40°F up to 122°F (-40°C to 50°C)

17

18

Dhu LCK Dehumidification Lockout Functions

Default value = On

Enables or disables the lockout functions for the
dehumidification control process of the output.

On: will restrict the dehumidification process based

on the following:

- System mode = Needs to be Cool or Auto (
currently operating in cooling only )

- Low ambient room temperature protection
enabled

Off: will not restrict the dehumidification process:

- System mode = Needs to be Cool, Heat or
Auto

- There is no ambient room temperature
protection enabled

DehuHyst Dehumidification hysterisys

Default value = 5% RH

Dehumidification control hysterisys.

Used only if dehumidification sequence is enabled.
From 2% RH up to 20% RH

RE Sp Reset humidity setpoint

Default value = 20% RH

The RH setpoint will be reset from the user setpoint
to this value when the RH LT outside air
temperature value is reached.
Only valid if an outdoor air sensor is connected at
the thermostat or a network value is transmitted to

the thermostat. See RH LT & RE HT.

From 10% RH up to 90% RH

RH cal Humidity sensor calibration

Default value = 0 %RH

Offset that can be added/subtracted to actual
displayed humidity by ± 15.0 %RH.
This calibration applies to the internal humidity
sensor if no remote humidity sensor is connected.
This calibration applies to the remote humidity
sensor when one is connected.

From –15% RH up to 15% RH

Display
HL

Display the high limit sensor value Used as diagnostic / service help to troubleshoot

and diagnose sensor / humidifier operation

Note:

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

• The heating lockout

• The cooling lockout

• The dehumidification lockout

• The humidity setpoint reset

PAN ID

Personal Area Network
Identification

Default value = 0

Range is: 0 to 500

Wireless Model only

Conditional parameter to Wireless models
(VT76x7B1000W)

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

19

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
(VT76x7B1000W)

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
(VT76x7B1000W)

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

Humidity setpoint reset by outside air temperature

45%

RH Set = 45%

40%

35%

RH HT = 32°F

30%

%RH Setpoint

25%

20%

RH LT = -20°F

-40°F

RE Sp = 20%

-20°F 0°F 20°F 40°F
Outside Air Temp.

Fig.11 – Humidity setpoint reset by outside air
temperature

High limit humidity sensor

100 %

Control
Output

Level

Fig.12 – High humidity limit vs Control output level curve

50 %

0 %

Maximum Supply Humidity

85 %

20

If an outdoor air sensor is connected at the thermostat
or a value is received from the network, it can be used
to reset the humidity setpoint during the cold season to
minimize condensation on windows and building
structures.

When the outdoor temperature falls below the selected

high temperature, parameter RH HT (32°F in the

example Figure 8), the humidity setpoint will start to
decrease. The lowest humidity setpoint will be reached

at selected low temperature, parameter RH LT (-20°F).

The setpoint decrease from original setpoint to the

lowest setpoint determined by the parameter RE Sp. In
the example, Figure 8, RE Sp was set to 20%, therefore

the humidity setpoint dropped from 45% to 20%.

If you don’t want to use this feature, set the RE Sp

parameter to 90% RH.

The VT76x7 series includes a high limit sequence. This
allows the use of a remote 0 to 10 Vdc humidity sensor to
limit the humidity in the supply air. If no sensor is detected at
the HL connector, this sequence is disabled at the
thermostat.

Note: this high limit function is not a safety device. For
critical situations, provide installation with normal protections
required to ensure a safe operation.

Troubleshooting guide

Symptom Possible Cause Corrective Action

No display on the
thermostat

Absent or incorrect supply
voltage

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

2. Check for tripped fuse or circuit breaker

Overloaded power
transformer

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

21

Keyboard menu does
not access all functions

Temperature setpoints
revert to original value
after a certain time
period

Thermostat will not call
for heating

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

Symptom Possible Cause Corrective Action

Thermostat will not call
for cooling

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

22

turn on the fan

Digital display shows
missing digits or erratic
segments

Thermostat will not call
for humidification

Thermostat will not call
for dehumidification

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

RH sensor is out of range Verify the remote RH sensor or the internal RH

sensor
System Mode in Cool or Off Change the system mode parameter to heat
System Mode in Auto but a
cooling demand at the

Wait: when a heating demand will occur at the

thermostat, humidification will resume
thermostat
High limit sensor is controlling
the humidifier output by

Wait: when the supply humidity will drop below the

high limit setpoint, humidification will resume.
forcing it to 0%
RH sensor is out of range Verify the remote RH sensor or the internal RH

sensor
System Mode in Heat or Off Change the system mode parameter to cool
System Mode in Auto but a
heating demand at the

Wait: when a cooling demand will occur at the

thermostat, dehumidification will resume
thermostat
Outside air temperature is
below the Dhu OALK

Change the Dhu OALK parameter to a value that will

enable the dehumidification, if desired.
parameter

Specifications

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

Temperature sensor: Local 10 K NTC thermistor

Resolution: Temperature: ± 0.1 °C (± 0.2 °F)

Humidity: ± 0.1%

Control accuracy: Temp: ± 0.5 ° C ( ± 0.9 °F ) @ 21 °C ( 70 °F ) typ. calibrated

Humidity: ± 5% RH from 20 to 0% RH at 50 to 90°F (10 to 32°C)

Humidification setpoint range: 10% RH to 90% RH

Dehumidification setpoint range: 15% RH to 95% RH

Occupied and unoccupied setpoint range cooling: 12.0 to 37.5 °C ( 54 to 100 °F )

Occupied and unoccupied setpoint range heating: 4.5 °C to 32 °C ( 40 °F to 90 °F )

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 input: Relay dry contact only across C terminal to DI1

Analog high limit and remote humidity inputs

0 to 10 Vdc into 10KΩ input load

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

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

Humidification analog output rating:

0 to 10 Vdc into 2KΩ resistance min.

Humidification 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:

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)

Agency Approvals Stand-Alone, BACnet & LON models

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

Agency Approvals Wireless models

FCC: Compliant to: Part 15, Subpart C

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

Important notice

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.

23

All VT7600
series
controls are
for use as