Veris VH7200 Installation Instructions

0 (0)

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.	Fig.1 VH7200 series humidistats
	Fig.1 VH7200 series humidistats

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

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

Models available

Application

Model Number

Dehumidification

Output

Model with Outdoor reset & Proportional High Limit

VH7270K1000 (X)

On-Off 24 Vac

Model with Outdoor reset & Proportional High Limit

VH7270F1000 (X)

On-Off 24 Vac

Models with outdoor reset only

VH7200A1000 (X)

On-Off 24 Vac

* NEW * Duct Mount Model with Outdoor reset &

VH7270D1000 (X)

On-Off 24 Vac

Proportional High Limit

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

Features and benefits

Features

Benefits

• Embedded humidification and dehumidification

Simplifies installation and reduce installation

sequences

costs

• Embedded internal RH sensor

Eliminates components

• Proportional high limit override

Prevents costly damage due supply humidity

• (VH7270 Models Only)

condensation

• Humidity setpoint reset based on outdoor

Saves energy and prevents window

temperature

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.

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.

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.

10Strip each wire 1/4 inch.

11Insert each wire according to wiring diagram. 13Gently push back into hole excess wring (Fig. 4)

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

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

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.

Note: For dimensions please see page 14

Fig.2

Fig.3

Fig.4

Wiring

Terminal identification & screw terminal arrangement

Part Number

VH7270K

VH7270D/F

VH7200A

Top left

terminal block

Not used

HUM

Not used

HUM

Not used

Top right

terminal block

DEH

Not used

Bottom

terminal block

Not used

HUM 0-10

Not used

DI1

SCOM

Not used

Fig.5 : VH7200’s wiring terminals

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

HumidificationOutput :

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

Refer to parameter:

S.A.

"SeqOpera"

FLOW

(0-10 Vdc)

FLOW

VH2030D1000

VH7270K1000

(On/Off) HUMIDIFIER

SWITCH

VH2030D1000

HUMIDIFIER

HUMIDITY TRANSMITTER

OPTIONAL

HUMIDITY CONTROLLER

( OPTIONAL HIGH LIMIT )

DUCT

0-10 24V

Com

MOUNTED

Dry contact

COM. 24 Vac

0-10 Vdc

HUMIDITY

TRANSMITTER

BLACK

RED

ORANGE

VH2030W1000

OPTIONAL

Dehumidification

WALL

Dry contact

and/or

MOUNTED

air exchanger

HUMIDITY

HUMHUM R

DEH DEH

TRANSMITTER

Note:

When a remote

humidity

transmitter

HUM

is connected to

0-10 DI1

HS Scom OS

the VH7200,

it's internal

humidity

Binary Input "Di1" Set

sensor is

S2020E1000 or S2000D1000

for "SERVICE" alarm

automatically

OPTIONAL OUTDOOR

TEMPERATURE SENSOR

disabled.

Fig.6 : VH7270F1000 wiring diagram

Specific wiring diagrams for all models VH7200A1000, VH7270F1000, VH7270K1000

24 Vac Hot

On/Off Humidification

24 Vac Com.

On/Off Dehumidification

HUM HUM	R	C	DEH DEH
			DEH DEH

VH7270K1000 Universal

Analog 0-10 Vdc Humidification Digital input, dry contact to "Scom"

Remote humidity sensor (opt.)

HUM	DI1 HS	Scom	OS	HL
0-10

Supply Humidity High Limit Sensor (opt.)

Outside air temperature sensor (opt.)

Sensor(s) and BI input common

24 Vac Com.

24 Vac Hot

VH7270F1000 Analog

VH7270D1000 Analog

Analog 0-10 Vdc Humidification Digital input, dry contact to "Scom"

Remote humidity sensor (opt.)

On/Off Dehumidification

R	C	DEH DEH
		DEH DEH

HUM	DI1 HS	Scom	OS	HL
0-10

Supply Humidity High Limit Sensor (opt.)

Outside air temperature sensor (opt.)

Sensor(s) and BI input common

24 Vac Hot

On/Off Humidification

24 Vac Com.

On/Off Dehumidification

HUM HUM	R	C	DEH DEH
			DEH DEH

VH7200A1000 On/Off

DI1 HS Scom OS

Digital input, dry contact to "Scom" Optional remote humidity sensor

Outside air temperature sensor (opt.) Sensor(s) and BI input common

Remote humidity sensor accessories

Model number

VH2020W1000

VH2020D10000

S2000D1000

S2020E1000

S1010E1000

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 )

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

before removal of the old humidistat.

• Electronic controls are static sensitive devices. Discharge yourself properly before manipulation and installing the humidistat.

•Short circuit or wrong wiring may permanently damage the humidistat 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 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 catastrophic failures.

Fig.9– VH2020W1000

Fig.10 – VH2020D1000 / S2000D1000

Fig.11 – S2020E1000

Fig.12 – S1010E1000

+ 9 hidden pages