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.
2
Wiring
3
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
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
au
tomatically
disabled.
VH7270K1000
HUMIDITY CONTROLLER
HUM
HUM
or
HUM
0-10
R C
DEH
DEH
Scom
HSDI1 OS
FLOW
(On/Off) HUMIDIFIER
H
H
Dry contact
Dry contact
HL
S202 00
0E1000 or S2000D10
OP
TIONAL OUTDOOR
TE R
MPERATURE SENSO
SWITCH
Dehumidification
air exchanger
and/or
(0-10 Vdc)
HUMIDIFIER
Com
0-10
24V
FLOW
SWITCH
XX
Binary Input "Di1" Set
for "SER VICE" alarm
VH2030D1000
HUMIDITY TRANSMITTER
(OPTIONALHIGH LIMIT)
24 Vac
COM. 0-10Vdc
K
C
A
L
B
E
D
E
G
R
N
A
R
O
Fig.6 : VH7270F1000 wiring diagram
Specific wiring diagrams for all models VH7200A1000, VH7270F1000, VH7270K1000
4
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
C
DI1 OSHS
CR
DEH
Scom
DEH
24 Vac Com.
On/Off Dehumidification
On/Off Dehumidification
DEH
HL
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
HS
HS
Scom
OS
DEH DEH
Scom
OS
HL
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–
p
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
Fi
Fig.11 – S2020E1000
Fig.12 – S1010E1000
5
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