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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-

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

Models Avalable

Application 2 Heat / 2 Cool

Model (programmable) VT7657B1000(X)

Model (non-programmable) VT7607B1000(X)

Ordering Information Notes:

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

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

Features and benefits

Features Benefits

• Embedded humidification sequence (0-10 Vdc output)

and dehumidification sequence (dry contact)

⇒ Simplifies installation and reduce installation costs

• 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

colder climates

• 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 ke

ad ⇒

Tam

roof

no need for thermostat

uards

• Freeze protection ⇒ Prevents costly freeze damage

• EEPROM memor

⇒

No loss of

ram

• 6 hour reserve time for clock ⇒

No need to re

ram da

/time after

ower shorta

• Remote outdoor tem

erature senso

⇒

Increase flexibilit

and functionalit

• Auxiliar

out

ut ⇒

Can be used for li

htin

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)

⇒ Can be used for all types of establishments

028-0174 R5_LIT-VT76x7-E05.doc

www.viconics.com / sales@viconics.com

Fig.1 - VT76x7 thermostat

Summary of content (23 pages)

PAGE 1
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.
PAGE 2
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.
PAGE 3
Installation Remove security screw on the bottom of thermostat cover. Open up by pulling on the bottom side of thermostat. • Remove Assembly and remove wiring terminals from sticker. (Fig. 3) • • A) 12345- Location: Should not be installed on an outside wall. Must be installed away from any heat source. Should not be installed near an air discharge grill. Should not be affected by direct sun radiation. Nothing must restrain vertical air circulation to the thermostat.
PAGE 4
Wiring Terminal identification & screw terminal arrangement Part Number VT7657B1000(X) VT7607B1000(X) Yes No Programmable Top left terminal block Y2 Y1 G RC C X X X X X X X X X X Y2 Y1 G RC C RH W1 W2 8 pole bottom connector Top right terminal block RH W1 W2 3 pole left top connector 5 pole left top connector X X X DE X X X HUM AUX HUM DI HS S COM OS HL Bottom terminal block HUM AUX DEHUM DI HS SCOM OS HL X X X X X X X X X X X X X X X X Detailed wiring diagrams for selected mo
PAGE 5
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.
PAGE 6
User menu flow chart: NOTE: Prompts may not all be present depending on model selected MENU T e mp e r a t s e t ? Y/ N If status is: Unoccupied Ov e r r i d e s c h d Y/ N If status is: Temporary Occupied Time, Occupied hold or Unoccupied hold Re s u me s c h d Y/ N Hu mi d i t y s e t ? Y/ N S y s mo d e s e t ? Y/ N Off Heat Cool Auto F a n mo d e s e t ? Y/ N On stand-alone models only Sc h e d ul e s e t ? Y/ N Cl o c k s e t ? Y/ N On Smart Auto Hu mi d i f i s e t ? Y/ N RH% RH% Ex
PAGE 7
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.
PAGE 8
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.
PAGE 9
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).
PAGE 10
Dehumidification process 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.
PAGE 11
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.
PAGE 12
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.
PAGE 13
I) Clock/Day Settings Clock set Y/N This section of the menu permits the user to set the time and day. Time setting Time set? Y/N Time 0:00 No next → Yes down ↓ Use ▲▼ To set value Day setting Day set? Y/N Day Monday No next → Yes down ↓ Use ▲▼ To set value Time format setting 12/24hrs set? Y/N 12/24hrs 12 hrs No = exit Yes down ↓ Use ▲▼ To set value J) Schedule hold Schedule hold Y/N This menu • • • • • This menu will only appear on stand-alone thermostat, e.i.
PAGE 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.
PAGE 15
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.
PAGE 16
Fan del Com Addr TOccTime Fan delay Default value = Off 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 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 Number of heating stages.
PAGE 17
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 This contact can be used to energize peripheral devices such as: lighting equipment, exhaust fans, economizers, etc.
PAGE 18
Dhu LCK Dehumidification Lockout Functions Default value = On DehuHyst Dehumidification hysterisys Default value = 5% RH RE Sp Reset humidity setpoint Default value = 20% RH RH cal Humidity sensor calibration Default value = 0 %RH Display HL Display the high limit sensor value Enables or disables the lockout functions for the dehumidification control process of the output.
PAGE 19
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.
PAGE 20
Humidity setpoint reset by outside air temperature 45% 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. RH Set = 45% %RH Setpoint 40% RH HT = 32°F 35% 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.
PAGE 21
Troubleshooting guide Symptom No display on the thermostat Possible Cause Absent or incorrect supply voltage Overloaded power transformer Corrective Action 1. Check power supply voltage between C & RC to be from 19-30 Vac 2.
PAGE 22
Symptom Thermostat will not call for cooling Possible Cause Wrong mode selected Thermostat in Unoccupied mode Anticycle delay active Cooling setpoint is satisfied Cooling lockout attained Wiring error Corrective Action Select cooling mode Select Occupied Hold in Schedule hold or Override to force the thermostat Occupied cooling setpoint Wait, the anticycling period will end and the equipment will start Lower the cooling setpoint 1. Mode is locked out based on outside air temperature 2.
PAGE 23
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.