Veris VH7200 Installation Instructions

VH7200 Humidistat Series

For Humidification & Dehumidification Control

For Commercial HVAC Applications

(Issue Date September 29, 2008 – 028-0208 R4)

Product overview

The VH7200 humidity controller family is specifically designed for control of humidification and dehumidification equipment such as steam header direct injection, desiccant wheel, or stand alone humidification / dehumidification equipment. The product features a complete embedded humidity control solution with an intuitive backlit LCD display that walks the installer through the configuration steps, making the process extremely simple. Accurate relative humidity control is achieved due to the product’s unique PI time proportional control algorithm, which virtually eliminates humidity offset associated with traditional, differential-based humidity controllers.

All models contain a binary input, which can be set by the user to monitor an electrode humidifier canister service status or may be used as a general purpose service indicator. Models are available which contain more advanced features such as discharge humidity proportional high limit, and indoor humidity setpoint reset based upon outdoor air temperature to conserve energy and eliminate condensation on windows and structure.

The additional following documents are available at:

• Information on the BACnet models (VH72xxX1000B), is available on document ITG-VH7200-BAC-Exx

www.viconics.com

Models available

Model with Outdoor reset & Proportional High Limit VH7270K1000 (X)

Application Model Number

Humidification

On/Off 24 Vac

Fig.1 VH7200 series humidistats

Dehumidification

Output(s)

0-10 Vdc &

On-Off 24 Vac

Output

Model with Outdoor reset & Proportional High Limit VH7270F1000 (X) 0-10 Vdc On-Off 24 Vac

Models with outdoor reset only VH7200A1000 (X) On/Off 24 Vac On-Off 24 Vac

* NEW * Duct Mount Model with Outdoor reset & Proportional High Limit

(X) model number represents available communication options: X=none for Stand-alone and X=B for BACnet MS-TP.

VH7270D1000 (X) 0-10 Vdc On-Off 24 Vac

Features and benefits

Features Benefits

• Embedded humidification and dehumidification sequences

⇒ Simplifies installation and reduce installation

costs

• Embedded internal RH sensor ⇒ Eliminates components

• Proportional high limit override

• (VH7270 Models Only)

• Humidity setpoint reset based on outdoor

temperature

⇒ Prevents costly damage due supply humidity

condensation

⇒ Saves energy and prevents window

condensation in colder climates

• Sensor failure protection ⇒ Prevents water damage

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

• Binary input ⇒ Adds functionality (Trigger service alarms )

• Unique configuration menu routine ⇒ Minimizes parameter tampering

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

• EEPROM memory ⇒ No loss configuration parameters

• Optional remote humidity sensors ⇒ Increase flexibility and functionality

028-0208 R4_LIT-VH72x0-E14.doc

www.viconics.com / sales@viconics.com

Features overview

• Internal RH sensor and optional remote RH input with embedded humidification and dehumidification sequence

of operation.

• Humidity set point reset based upon outdoor temperature sensing for added flexibility.

• Proportional high limit input to prevent over-humidification due to supply humidity condensation.

• Lockable keypads for tamper proofing. No need for extra humidistat guard.

• Programmable binary 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 humidistat 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.

- Canister: a backlit flashing Canister alarm will be displayed on the humidistat LCD screen when the input is energized. It can be tied to a Dry contact output supplied by others.

Installation

• Remove security screw on the bottom of humidistat cover.

• Open up by pulling on the bottom side of humidistat.

• Remove Assembly and remove wiring terminals from sticker.

(Fig. 2)

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.

Fig.2

5- Nothing must restrain vertical air circulation to the

humidistat. B) Installation: 1- Swing open the humidistat PCB to the left by pressing the

PCB locking tabs. (Fig. 3) 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.

Fig.3

6- Install anchors in the wall. 7- Insert screws in mounting holes on each side of the base.

(Fig. 3) 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. 4) 14- Re-Install wiring terminals in correct location. (Fig. 4) 15- Reinstall the cover (top side first) and gently push back

extra wire length into the hole in the wall. 16- Install security screw.

Fig.4

For VH7270D1000 duct-mount model only:

1- Make 1” diameter hole in duct wall 2- Insert the duct sensor and fix the electrical box to the

duct wall in the vertical position (respect airflow direction).

3- Install the humidistat to the electrical box using the

supplied screws (2).

4- Follow steps 1-16 above.

Wiring

Terminal identification & screw terminal arrangement

Part Number VH7270K VH7270D/F VH7200A

Top left terminal block

1 Not used Not used Not used 2 HUM 3 HUM 4 R 5 C

X X X X X X X X

Not used Not used

X X

Top right terminal block

6 DEH 7 DEH

X X X X X X

8 Not used Not used Not used

Bottom terminal block

9 Not used Not used Not used 10 Not used Not used Not used 11 HUM 0-10 12 DI1 13 HS 14 SCOM 15 OS 16 HL

X X X X X X X X X X X X X X X X

Fig.5 : VH7200’s wiring terminals

Not used

Wiring notes:

Note 1: Reference of the analog 0-10 Vdc control signal is the common of the power supply of the humidistat. (terminal C)

Note 2: Electromechanical dry contact is to be used with the binary 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 Scom

Note 3: The transformer of the unit provides power to the humidistat and any additional loads wired to the humidistat.

Note 4: Both the remote humidity sensors ( HS & HL terminals ) use 0 to 10 Vdc type humidity sensors.

Detailed wiring diagram for model VH7270K1000

R.A. S.A.

HumidificationOutput :

( On/Off ) or ( 0- 10 Vdc )

Refer to parameter:

"SeqOpera"

VH2030D1000

OPTIONAL

DUCT MOUNTED HUMIDITY

TRANSMITTER

VH2030W1000

OPTIONAL

WALL MOUNTED HUMIDITY

TRANSMITTER

Note:

Whenaremote

humidity

transmitter

is connected to

the VH7200,

it's internal

humidity

sensor is

tomatically

disabled.

VH7270K1000

HUMIDITY CONTROLLER

HUM

0-10

R C

DEH

Scom

HSDI1 OS

FLOW

(On/Off) HUMIDIFIER

Dry contact

S202 00

0E1000 or S2000D10

TIONAL OUTDOOR

TE R

MPERATURE SENSO

SWITCH

Dehumidification

air exchanger

and/or

(0-10 Vdc) HUMIDIFIER

Com

0-10

24V

FLOW

SWITCH

Binary Input "Di1" Set for "SER VICE" alarm

VH2030D1000

HUMIDITY TRANSMITTER

(OPTIONALHIGH LIMIT)

24 Vac

COM. 0-10Vdc

K C

A R O

Fig.6 : VH7270F1000 wiring diagram

Specific wiring diagrams for all models VH7200A1000, VH7270F1000, VH7270K1000

24 VacHot On/Off Humidification On/Off Humidification

VH7270K1000 Universal

Analog 0-10 Vdc Humidification

Digital input, dry contact to "Scom"

Remote humidity sensor (opt.)

24 Vac Com.

24 VacHot

HUMRHUM

HUM

0-10

DI1 OSHS

DEH

Scom

DEH

24 Vac Com.

On/Off Dehumidification On/Off Dehumidification

DEH

Supply Humidity High Limit Sensor (opt.) Outside air temperaturesensor (opt.) Sensor(s) andBI inputcommon

On/Off Dehumidification On/Off Dehumidification

DEH

VH7270F1000 Analog

VH7270D1000 Analog

Analog 0-10 Vdc Humidification

Digital input, dry contact to "Scom"

Remote humidity sensor (opt.)

24 VacHot On/Off Humidification On/Off Humidification

VH7200A1000 On/Off

Digital input, dry contact to "Scom"

Optional remotehumidity sensor

HUM

0-10

HUMHUM

DI1

R C

DI1

Scom

DEH DEH

Scom

Supply Humidity High Limit Sensor (opt.) Outside air temperaturesensor (opt.) Sensor(s) andBI inputcommon

24 Vac Com.

On/Off Dehumidification On/Off Dehumidification

Outside air temperaturesensor (opt.) Sensor(s) andBI input common

g.9–

Remote humidity sensor accessories

Model number Description: VH2020W1000 VH2020D10000 S2000D1000 S2020E1000 S1010E1000

VH2020W1000, remote wall mounted room humidity sensor.

(see Fig.8) (wiring diagram next page)

VH2020D1000, remote duct mounted humidity sensor c/w junction box.

(see Fig.9) (wiring diagram next page) 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.

S2020E1000, commercial style outside air temperature sensor in a NEMA 4 enclosure. (see Fig.10) (wiring diagram next page)

S1010E1000, residential style outside air temperature sensor, capsule type. (see Fig.11) (wiring diagram next page)

• These sensors are used for the humidity setpoint reset function based on outdoor temperature.

INSTALLATION NOTICE !

• If replacing an old humidistat, label the wires

• Electronic controls are static sensitive devices.

• Short circuit or wrong wiring may permanently

• Anti-short cycling can be set to 0 minutes for

•

Wall mounted humidity transmitter 2% R.H. Duct mounted humidity sensor 2% R.H. Duct mounted outside air temperature sensor Outside air temperature sensor in a NEMA 4 enclosure Outside air temperature sensor, capsule type ( ¼” dia., 1” long )

before removal of the old humidistat.

Discharge yourself properly before manipulation and installing the humidistat.

damage the humidistat or the equipment.

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 VH7200 series humidistat 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 catastro

hic fa

ilures.

Fig.10 – VH2020D1000 / S2000D1000

VH2020W1000

Fig.11 – S2020E1000

Fig.12 – S1010E1000

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