Viconics VT7600 Installation Guide

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 / sales@viconics.com

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.

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)

• 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

Y2Y

Wiring

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

O/B

8 pole bottom connector

EC AU

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.

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

Thermostat Terminals -VT7656B1000

RCGY1

Scom

RS OS

W1RH

MSScom OS

DI1 DI2 RS

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

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

Y1 RCG

DI1 DI2AU

Scom

OSRS

Remote

Mixed Air

Sensor

O/B

Digital Input #1

Digital Input #2

ScomRS

Remote

Room

Sensor

Field contacts

Remote Outdoor

Sensor

MSOS

Remote

Mixed Air

Sensor

Compressor

Stage 2

Compressor

Stage 1

Thermo stat internal wiring System wiring Jumper J1

Fan

Jumper J1 See note 1 (previous page)

RC C RH

24 Vac

Auxiliary

Heat

O/B AU

Reversing

Valve

DI1 DI2

Auxiliary

Output

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

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

ScomRSScom

Aux

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

ScomRSScom

Fig.8 – S3020W1000 wall mounted sensor

S2-1 = ON

S2-2 = ON

Dip switch

setting for:

1 senso

Wiring examples of 2 remote room sensors for averaging applications:

VT7600 Series Thermostat

Scom

VT7600 Series Thermostat

Scom

RS AU

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

ScomRSScom

Aux

ScomRSScom

Aux

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

ScomRSScom

Aux

ScomRSScom

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

mixed matched.

be wired in parallel.

remote sensor.

Wiring examples of 3 remote room sensors for averaging applications:

VT7600 Series Thermostat

Scom

RS AU

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

ScomRSScom

Aux

ScomRSScom

VT7600 Series Thermostat

Scom

RS AU

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

ScomRSScom

Aux

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

ScomRSScom

Dip switch setting for:

2 sensors

ScomRSScom

Aux

ScomRSScom

Dip switch

setting for:

3 sensors

S2-1 = OFF

S2-2 = ON

S2-1 = OFF

Temperature vs resistance chart for 10 Kohm NTC thermistor

= 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

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

10 K

Scom

ScomMSScom

10 K

(

10 K

User menu flow chart: NOTE:

Prompts may not all be present depending on model selected

If status is: Unoccupied

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

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

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