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ELECTRONIC HUMIDISTAT: H270

• ONE OR TWO STAGES

• HUMIDITY SUPPLY HIGH LIMIT

• OUTDOOR TEMPERATURE RESET

DESCRIPTION

The H270 series low voltage, microcomputer-based PI

(proportional and integral) humidistats are designed for

accurate humidification and/or dehumidification control

in commercial applications such as: hospitals, schools,

office buildings, retail stores, museums, computer

rooms, etc.

The H270 series is available with one or two outputs

for maximum flexibility. Outputs can be of the following

type: proportional, on/off, and pulse width modulation

(PWM). Two additional inputs are provided in order to

perform unique functions: humidity setpoint reset

based on outdoor air temperature and proportional

high limit override. The former function minimizes

condensation on window surfaces during cold outdoor

temperatures by automatically lowering the humidity

setpoint as the outdoor temperature drops. The latter

function improves accuracy and safety by throttling

back the humidifier control output if the humidity level

reaches unacceptably high levels.

There are many different types of mounting

configurations available. Sensing options include

remote duct and room as well as integral room and

duct. Setpoint adjustment can be either concealed or

exposed, adding even more versatility to the product.

Exposed models feature internally selectable minimum

and maximum setpoint knob stops.

In order to facilitate periodic recalibration, the H270

series contains a unique autocal key, which permits

instant recalibration (see dimension drawing on page 5

for location).

Each humidistat is computer calibrated and factory

programmed with default parameters. All control

parameters (such as proportional band, stage

differential, etc.) may be changed in the field with the

H263 programming tool without having to remove the

thermostat cover. The H263 also doubles as a

diagnostic tool and indicates the status of all the inputs

and outputs, and will reduce troubleshooting time by

quickly identifying the specific problem.

Fig.1 Wall mounted humidistat

Features Benefits

• Microcomputer-based design with PI algorithm ⇒

Exceptional accuracy

• One or two outputs ⇒

Controls humidification and dehumidification equipment

• On/off and/or proportional outputs ⇒

Greater flexibility

• Direct or reverse acting outputs ⇒

Controls humidification and dehumidification equipment

• Integrated and remote sensing ⇒

Larger choice of mounting options

• Autocal button ⇒

Permits instant recalibration

• Concealed or exposed set point ⇒

Can be used in a large variety of environments

• Ouput signal to digital indicating devices ⇒

Increases functionality of product

• Optional H263 diagnostic tool with digital display ⇒

Simplifies troubleshooting

• Sensor failure protection ⇒

Prevent water dammage

• Humidity setpoint reset based on outdoor temp. ⇒

Prevents window condensation in colder climates

• Proportional high limit override ⇒

Prevents costly damage due to over-humidification

• CE approved ⇒

Can be sold in European markets

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Resumo do Conteúdo

Página 1

1ELECTRONIC HUMIDISTAT: H270• ONE OR TWO STAGES• HUMIDITY SUPPLY HIGH LIMIT• OUTDOOR TEMPERATURE RESETDESCRIPTION

Página 2

2TABLE 1: ORDER CODE H270 - A-B - C-D - E-F G-HA Output no. 1 ( controlled device )1 ON/OFF (15 min. time

Página 3 - 2 PROPORTIONNAL OUTPUT

32 PROPORTIONNAL OUTPUTFig.4: Wiring diagram with two analog outputs1 PROPORTIONNAL AND 1 TRANSMITTER OUTPUTFig.5: Wiring diagram with one analog and

Página 4

4TABLE 2: HUMIDISTAT ACCESSORIES H

Página 5 - OUTSIDE AIR TEMPERATURE

5CONTROL SCHEMATIC:

Página 6 - CONTROL OUTPUT LEVEL

6TABLE 3: H263 HUMIDISTAT PROGRAMMING TOOL CODE VALUES

Página 7 - 1.60" [41mm]

Viconics Electronics Inc.9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P [email protected] H270.doc7"Autoca

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