Viconics VTR7300 Application Guide

HVAC Application Manual

VTR73XXA Series Fan Coil Terminal Equipment Controller

VC3XXXX Series Line Voltage Switching Relay Packs

Product overview

The VTR73XX Series Fan Coil Terminal Equipment Controller used in conjunction with the
VC3000 Series Line Voltage Switching Relay Packs is specifically designed for fan coil
control applications. They can be used both for new or retrofit applications. In retrofit
applications, they can re-use the existing wires between the old line voltage switching
thermostat and the fan coil thus saving on the installation of any new wires. Stand-alone
and network operation are available.

The VTR73XX Series Fan Coil Terminal Equipment Controller features a backlit LCD
display with dedicated function menu buttons for simple operation. Accurate temperature
control is achieved due to the product’s PI proportional control algorithm, which virtually
eliminates temperature offset associated with traditional, differential-based Terminal
Equipment Controllers. All models feature configurable System and Fan button functions to
meet all possible applications The VTR73XX Terminal Equipment Controllers are powered
and communicate with the associated VC3000 Series Relay Pack(s) using only 3 wires.

2 types of interfaces for the user can be ordered. The VC73x5 models are typically used for hotel and lodging applications
where the middle button of the interface is for the user to select the local displayed scale in ºF or ºC. The VC73x0 models are
typically used for commercial and institution applications where the middle button of the interface is defined for the local
unoccupied override function.

The VTR73XX Terminal Equipment Controllers are also compatible with the new Viconics PIR
cover accessories. Terminal Equipment Controllers equipped with a PIR cover provide
advanced active occupancy logic, which will automatically switch occupancy levels from
Occupied to Stand-By and Unoccupied as required by local activity being present or not. This
advanced occupancy functionality provides advantageous energy savings during occupied
hours without sacrificing occupant comfort. All Terminal Equipment Controllers can be
ordered with or without a factory installed PIR cover ( see ordering notes below ).

The compatible VC3000 Series Line Voltage Switching Relay Pack(s) operate as slave unit(s)
under the control of a single master VTR73XX Terminal Equipment Controller. A single
VTR73XX Terminal Equipment Controller can control up to 10 VC3000 Series Relay Pack. The
VC3000 Series Relay Packs are line-powered units. They locally contain all the relay outputs for fan switching and valve control.
Models are also available for extra monitoring / control inputs of the Fan Coil Units.

For Commercial and Lodging HVAC Fan Coil Applications

(Issue Date: March 29, 2010 – 028-6021_R00)

VTR73x5X Lodging VTR73x0X Commercial

VC3000 Series Relay Pack

The additional following documents are available at: www.viconics.com

• PIR application information and examples, are available on document: APP-PIR-Guide-Exx

• PIR cover installation information is available on document: PIR Cover Installation-Exx

• Information on the LON models (VTR73xxX5x00E), is available on document ITG-VTR73-PIR-LON-Exx

• Information on the BACnet models (VTR73xxX5x00B), is available on document ITG-VTR73-PIR-BAC-Exx

• Information on the Wireless models (VTR3xxX5x00W), is available on documents: ITG-VWG-40-BAC-Exx and LIT-VWG-40-SETUP-Exx

VTR73XXA models available

Viconics part number VTR7300A5x00(x) VTR7350A5x00(x) VTR7305A5x00(x) VTR7355A5x00(x)
Primary market

User interface definition

On board %RH sensor

For dehumidification strategy

Ordering Information Notes:
The (X) at the end of the model number represents available communication options:

• X = none for Stand-alone • X = E for Echelon

• X = B for BACnet MS-TP • X = W for Wireless

The Terminal Equipment Controllers can be ordered with a factory installed PIR cover. Please use (5500) extension instead of
the (5000) only extension. The Terminal Equipment Controllers ordered without a PIR cover can be retrofitted with a separate
PIR accessory cover afterwards if required.

Ordering examples:

• A VTR7305AW5500B is for a wall mounted Terminal Equipment Controller with a hotel / lodging interface with a factory
mounted PIR cover and an MS-TP BACnet communication interface.

• A VTR7350A5000W is for a wall mounted Terminal Equipment Controller with a commercial / institution interface and a
wireless communication interface. The Terminal Equipment Controller can be retrofitted with a separate PIR accessory
cover afterwards if required.

028-xxxx R0_APP-VTR73XXA-PIR-E04.doc www.viconics.com / [e-mail]

Commercial and institution applications Hotels and lodging applications

None Yes None Yes

VC3xxxX relay pack models available

Applications

Fan control
Monitoring
inputs
Control types

Ordering Information Notes:

Please refer to the “Operation overview” section for related information on VTR73xxA and VC3xxxX arrangements and possible
combinations.

Ordering examples:

VC3500E5000 VC3504E5000 VC3400E5000 VC3404E5000 VC3300E5000

2 pipes
2 pipes with reheat
4 pipes

Up to 3 speed Up to 3 speed Up to 3 speed Up to 3 speed Up to 3 speed
None 4 FCU remote inputs None 4 FCU remote inputs None

On-Off line switched
valve output control

- 1 heat / cool output

- 1 cool output

- 3 fan outputs

• More than one VC3xxxX Relay Pack can be used for a single VTR73xxA Terminal Equipment Controller.

• Only one VC3x4X Relay Pack with monitoring inputs can be used for a single VTR73xxA Terminal Equipment Controller

• A VC3500E5000 is for a 90 to 277 Vac powered FCU mounted Relay Pack with the following outputs:

o Three 90 to 277 Vac switching fan relay outputs
o Two 90 to 277 Vac switching valve relay outputs

• A VC3504E5000 is for a 90 to 277 Vac powered FCU mounted Relay Pack with the following inputs and outputs:

o One configurable universal input
o One configurable binary input
o One dedicated discharge air temperature monitoring input
o One dedicated return air temperature control input
o Three 90 to 277 Vac switching fan relay outputs
o Two 90 to 277 Vac switching valve relay outputs

• A VC3300E5000 is for a 90 to 277 Vac powered FCU mounted Relay Pack with the following outputs:

o Three 90 to 277 Vac switching fan relay outputs

2 pipes
2 pipes with reheat
4 pipes

On-Off line switched
valve output control

- 1 heat / cool output

- 1 cool output

- 3 fan outputs

2 pipes
2 pipes with
modulating pulsed
reheat

On-Off line switched
valve output control

- 1 heat / cool output

- 1 Modulating pulsed

Vdc output for SSR
electric reheat
control

- 3 fan outputs

2 pipes
2 pipes with
modulating pulsed
reheat

On-Off line switched
valve output control

- 1 heat / cool output

- 1 Modulating pulsed

Vdc output for SSR
electric reheat
control

- 3 fan outputs

Slave Fan Unit

Slave fan control only

Slave fan control only

3 fan outputs

Features and benefits

Features VTR73xxA Terminal Equipment
Controller

Benefits

• Models available with internal humidity sensing ⇒ Increased occupant comfort through dehumidification

• Advanced occupancy functions ⇒ Through the network or smart local occupancy sensing

• Ready for PIR accessory cover ⇒ Fully integrated advanced occupancy functionality

• Configurable sequences of operation ⇒ Single model meets more applications

• Configurable fan functions button ⇒ Meets more applications with a single model

• Unique configuration setup utility ⇒ Minimizes parameter tampering

• Multi level lockable keypad

• Auto Fan speed mode

⇒ Tamper proof, no need for Terminal Equipment Controller

guards

⇒ Increased occupant comfort in cooling mode by reducing

humidity and offer less fan noise in all mode of operation

Features VC3xxxX Relay Pack Benefits

• Universal line powered from 90 to 277 Vac

• Line switching from 90 to 277 Vac ⇒ No pilot duty relay required

• 2 configurable inputs ⇒ Adds functionality

• Dedicated discharge air temperature monitoring ⇒ Adds functionality

• Dedicated return air temperature control ⇒ Return air temperature control where application dictates

• Pulsed Vdc output for SSR electric reheat

⇒ No external transformer needed
⇒ One model fits all voltage requirements

⇒ Advanced modulating electric heat control on specific

models

2

Operation overview

The VC3xxxX Series Line Voltage Switching Relay Pack(s) operate as slave unit(s) under the control of a single master
VTR73xxA Terminal Equipment Controller.

A) Each application below represents typical 3 speed FCU fan motor applications. Fan operation can be configured and wired
for the following:

o 3 Speed configuration using 3 fan relays ( Low – Med - High )
o 2 Speed configuration using 2 fan relays ( Low - High )
o 3 Speed configuration with Auto fan speed mode using 3 fan relays ( Low – Med - High )
o 2 Speed configuration with Auto fan speed mode using 2 fan relays ( Low - High )
o Single fan speed configuration.

B) Each application below represents typical 2 or 4 pipe heating / cooling FCU applications.
2 or 4 pipe only operation can be configured and wired for the following:

o Cooling only
o Heating only
o Cooling / Heating with network or local auto changeover

2 or 4 pipe only with electric reheat can be configured and wired for the following:

o Cooling only
o Heating only
o Cooling / Heating with network or local auto changeover
o On-Off electric reheat only
o Cooling with On-Off or modulating Vdc pulsed electric reheat ( model dependent )
o Heating with On-Off or modulating Vdc pulsed electric reheat ( model dependent )
o Cooling / Heating with network or local changeover with On-Off or modulating Vdc pulsed electric reheat ( model

Operation Concept

dependent )

 The VC3xxxX Relay Pack supplies power to the wall VTR73xxA Terminal Equipment Controller.
 The VTR73xxA Controller operates the VC3xxxX Relay Pack(s) via a simple communication bus.
 A maximum of 10 VC3xxxX Relay Pack can be used under a single VTR73xxA Terminal Equipment Controller.
 3 wires minimum are required between the VTR73xxA Controller and the first VR7300 Relay Pack.
 The 3 wire functions are as follow:

o 1 Tx / Rx Communication
o 2 Power Hot 7.0 Vdc 4 Watts maximum ( required for the VTR73xxA Controller power )
o 3 Power common

 Commands for fan speed and valve operation are issued from the VTR73xxA Terminal Equipment Controller to the

VC3xxxX Relay Pack(s)

 FCU Remote inputs for monitoring and control. Remote inputs are read at the VC3xxxX Relay Pack ( models with

inputs only ). The present value of these inputs are read by the VTR73xxA Terminal Equipment Controller for it’s
internal operation

o RUI1 can be configured for:

o RBI2 can be configured for:

o SS is dedicated to a discharge air sensor ( Auto Detect )
o RS is dedicated to a remote return air sensor ( Auto Detect )

 None = no functions associated
 COS = for a local 2 pipes system Change Over thermistor sensor
 COC NO = for a local 2 pipes system Change Over Normally Opened dry contact thermostat
 COC NC = for a local 2 pipes system Change Over Normally Closed dry contact thermostat
 Service = A local and / or networked service alarm
 Filter = A local and / or networked dirty filter alarm

 None = no functions associated
 Service = A local and / or networked service alarm
 Filter = A local and / or networked dirty filter alarm

3

 VTR73xxA Occupancy function remote inputs. All wiring for those remote inputs is located at the wall VTR73xxA

Terminal Equipment Controller.

o BI1 can be configured for:

 None = no functions associated
 Motion NO = for a remote normally opened contact PIR motion sensor
 Motion NC = for a remote normally closed contact PIR motion sensor
 Rem NSB = for usage with a remote on-off contact device for the occupancy function. A typical application

is a room tenant card holder, which force the occupancy if the card is inserted in the holder.

 Window = A local and / or networked window opened alarm. The system heating and cooling actions are

also locked out.

o BI2 can be configured for:

 None = no functions associated
 DoorDry = for usage of a PIR and entrance door switch for lodging occupancy routine

 All communication wires ( if needed ) are located at the VTR73xxA Terminal Equipment Controller

Typical one to one set-up

4

Local Inputs at VTR7300 Controller

Special optional local funct ion(s):

- Remote motion detector(s)

- Window contacts

- Occupancy card holder

Existing or New Field VTR7300 Wires

3 minimum required 14-22 Ga

Solid or Str anded

Optional FCU Monitori n g Inputs

- Changeover sensor or contact

Model Dependent

- Service or Filter alarms

- Supply air sensor

- Return air sensor

Existing or New Communication Field Wires

- BACnet MS-TP

- LON TP-FT 10

- Wireless ( No wires )

High Voltage in cabinet wiring

- Line powered 90 to 277 Vac

- Line switching of fan & valves 90 to 277 V ac

- Isolated heating output for electric reheat

Line Voltag e Power

Line Voltage Va l v e s

- 2 pipes or 4 pipes applications

- Isolated line switching for electric reheat

H

C

Line Voltag e Fa n

- Configurable

- Up to 3 speed
fan control

- Auto fan speed

Typical line wiring one to one setup

Line Voltage Electrical Ratings

Power supply

Fan line voltage contact
Wire connections
½ HP Maximum
Valve line voltage

contact
Yellow wire connection
10A maximum
Valve line voltage

contact
Orange wire

connections
10A maximum

VC3500E5000 VC3504E5000 VC3400E5000 VC3404E5000 VC3300E5000

Slave Fan Unit

- 90 to 277 Vac universal all models

- Black Hot L1 Power Vac ( Switches: Brown, Blue, Red & Yellow )

- White Neutral Power Vac

3 Fan Speed
Control Wires

Brown, Blue, Red
4 Pipes Cool output

Or
2 Pipes Heat / Cool

output
4 Pipes Heat output
Isolated dry contact

output
Or
2 Pipes reheat

output

3 Fan Speed
Control Wires

Brown, Blue, Red
4 Pipes Cool output

Or
2 Pipes Heat / Cool

output
4 Pipes Heat output
Isolated dry contact

output
Or
2 Pipes reheat

output

3 Fan Speed
Control Wires

Brown, Blue, Red
2 Pipes Heat / Cool

output

N/A N/A N/A

3 Fan Speed
Control Wires

Brown, Blue, Red
2 Pipes Heat / Cool

output

3 Fan Speed
Control Wires

Brown, Blue, Red
N/A

5

VC3504E

Relay Pack

Brown - High Speed
Blue - Medium Speed
Red - Low Speed

Orange - Heating Valve

Yellow - Cooling Valve

For 2 pipe applications use cooling valve yellow wire connection

Orange - Electric Reheat

For electric reheat applications where current draw is under above 10 A
use a line powered coil pilot duty relay or contactor for the heating element
in place o f the heating va lv e

M

3 Speed

Applications

M

2 Speed

Applications

V

V

R

M

Single Speed

Applications

Black - Hot Power
Orange - Connected to Black Hot
White - Neutral

Fan Spee d Arrang ement
By Configuration

Typical master slave applications with single or multiple fan(s)

Basic single FCU applications

o One fan motor under 1/2HP

o One, Two (or more) fan motors where each fan

motor is more than 1/2HP

o ( Pilot duty application )

o Two (or more) fan motors where

o Two (or more) fan motors where:

 each fan motor is under 1/2HP
 totalling under

1/2HP combined

 each fan motor is under 1/2HP
 totalling more than

1/2HP combined

6

Advanced single FCU applications

o One fan motor under 1/2HP

o One, Two (or more) fan motors where each fan

motor is more than 1/2HP

o ( Pilot duty application )

o Two (or more) fan motors where

 each fan motor is under 1/2HP
 totalling under

o Two (or more) fan motors where:

 each fan motor is under 1/2HP
 totalling more than

1/2HP combined

7

1/2HP combined

Basic multiple FCU applications

o One fan motor per FCU under 1/2HP

o Two (or more) fan motors per FCU where

 each fan motor is under 1/2HP
 totalling under

o

1/2HP combined

Two (or more) fan motors per FCU where:

 each fan motor is under 1/2HP
 totalling more than

1/2HP combined

9

o One, Two (or more) fan motors per FCU where each fan motor is more than 1/2HP
o ( Pilot duty application )